HomeMy WebLinkAbout2015-03-24 PACKET 03.A.Cottage
J Grove
'Ph ere Pride and P105 perity Meet
TO: Craig Woolery, Public Safety Director /Police Chief
Pete Koerner, Deputy Director of Public Safety
Les Burshten, Director of Public Works
Bob LaBrosse, Chief Building Official
FROM: John McCool, Senior Planner
DATE: March 19, 2015
RE: Proposed City Code Amendments — Land Spreading Septage
Introduction
Washington County is in the process of amending their Subsurface Sewage Treatment System
(SSTS) ordinance. Among the many proposed changes, the issue of permitting land spreading of
untreated septic waste is proposed in the County's Ordinance amendment. The proposed "land
spreading" regulation does incorporate an oversight of land spreading activities in compliance
with federal regulations and state guidelines. The County's Department of Health will have the
right to access sites and evaluate the suitability of applying septage. A permit from the County
prior to land spreading septage is required. Their ordinance also implements the policies outlined
in their Groundwater Plan.
"Septage" is defined as "solids and liquids removed from an SSTS and includes solids and liquids
from cesspools, seepage pits, other pits, or similar systems or devices that receive sewage.
Septage also includes solids and liquids that are removed from portable, incinerating,
composting, holding, or other toilets. Waste from Type III marine sanitation devices, as defined
in Code of Federal Regulations, title 33, section 159.3, and material that has come into contact
with untreated sewage within the past 12 months is also considered septage."
Background
On March 14, 2011, the Minnesota Pollution Control Agency (MPCA) published a major update to
Minnesota Rules, Chapter 7080 through 7083, governing Subsurface Sewage Treatment
Systems. Minor revisions were also made in January 2014. Washington County.is required to
revise and implement an SSTS Ordinance in compliance with Chapter 7080, 7081, 7082, and
7083.
The Washington County Department of Public Health and Environment held a public hearing
before the County's Planning Advisory Commission on February 24, 2015. The Washington
County Board has not yet taken final action regarding their SSTS Ordinance amendments.
City Staff Memorandum
Subsurface Sewage Treatment Systems
March 19, 2015
Page 2 of 3
Considerations
The purpose of this memo is to highlight changes between the County's current SSTS Ordinance
and the proposed SSTS Ordinance amendments. Title 8, Water and Sewer, Chapter 2, Individual
Sewage Treatment Systems (ISTS) in Cottage Groves City Codes adopts and incorporates the
County's SSTS standards. If the County approves their proposed amendments, which includes
the possibility of land spreading septage, the City of Cottage Grove is bound to those same
regulations. A complete copy of the proposed ordinance (124 pages) will be electronically
distributed to you.
The County said the City could adopt an ordinance prohibiting land spreading, even though their
proposed ordinance would permit land spreading. Their proposed ordinance will require SSTS
maintainers to obtain maintenance permits prior to servicing systems, minimum setbacks from
stream beds, wetlands, residential development, soil testing, permits issued before land
spreading, and will perform site inspections for compliance.
The City of Cottage Grove has concerns for allowing land spreading septage within the Cottage
Grove municipal boundaries. These concerns are:
• Based on Washington County's Groundwater Plan 2014 -2024, the majority of the bedrock
sensitivity within the City of Cottage Grove is identified as "High- Moderate ", "High ", and
"Very High ".
• Based on Washington County's Groundwater Plan 2014 -2024, the majority of the water
table sensitivity within the City of Cottage Grove is identified as being "High" and "Very
High ".
• Based on the Washington County's Groundwater Plan 2014 -2024, the majority of the
infiltration potential within City of Cottage Grove is identified as "High" and "Very High"
• As referenced in the Washington County Groundwater Plan 2014 -2024, past studies have
shown higher concentrations of nitrates and other pollutants in areas of high density septic
systems. For example, a February 2000 study by the MPCA evaluated contamination
related to SSTS beneath an unsewered portion of southeast Washington County. The
southeast area in Washington County was chosen for study based on the higher sensitivity
of bedrock, water table, and groundwater systems to contamination.
• The City of Cottage Grove understands that Washington County will develop a county wide
assessment that utilizes geologic data, nitrate testing /mapping, housing stock data, and a
community approach to determine risk levels of existing systems throughout the county.
The City further understands that if the County decides to allow land application of
untreated domestic septage, the County will develop and implement a rigorous regulatory
program to ensure the process is done safely and protective of county surface and
groundwater.
• The Minnesota Department of Health in November of 2006 tested the City's 11 municipal
wells for perfluorochemicals (PFC's). The City's public water supply system was found to
have various PFC's concentrations below the health based value. Since the discovery of
City Staff Memorandum
Subsurface Sewage Treatment Systems
March 19, 2015
Page 3 of 3
these chemicals the Minnesota Pollution Control Agency and the Department of Health
have been actively monitoring and modeling the contamination plume. The contamination
plume is wide spread in City's Drinking Water Supply Management Area (DWSMA) due to
the bedrock geology and karst features of the area.
If the City prohibits land spreading, the County said they will honor the City's proposed ordinance
amendment and not issue any permits for land spreading septage in Cottage Grove.
For your consideration, the draft ordinance amending Title 4, Public Safety and Health and Title
8, Sewer and Water of the City Codes was prepared for purposes of prohibiting land spreading
within Cottage Grove's municipal boundaries. We wanted you to know and have an opportunity
to comment on the proposed ordinance amendments to ensure you agree with this
recommendation to the City Council.
A copy of the proposed City Ordinance amendment is attached. This amendment will be on the
April 1, 2015 City Council for consideration.
1 ORDINANCE NO. XXX
2
3
4 AN ORDINANCE FOR THE CITY OF COTTAGE GROVE, MINNESOTA,
5 AMENDING TITLE 4, CHAPTER 1, SECTION 3; NUISANCES AFFECTING HEALTH
6 AND TITLE 8, CHAPTER 2; INDIVIDUAL SEWAGE TREATMENT SYSTEM OF THE
7 COTTAGE GROVE CITY CODE RELATING TO THE PROHIBITION OF LAND
8 SPREADING SEPTAGE FROM SUBSURFACE SEWAGE TREATMENT SYSTEMS
9
10 The City Council of the City of Cottage Grove, Washington County, Minnesota, does
11 hereby ordain as follows:
12
13 SECTION 1. FINDINGS. The City of Cottage Grove City Council hereby makes the
14 following findings of fact:
15
16 1. The City of Cottage Grove adopted and incorporated Washington County's
17 standards and regulations (Washington County Ordinance No. 179) regarding
18 Subsurface Sewage Treatment Systems (SSTS) regulations by adopting
19 Ordinance No. 879 on April 21, 2010.
20
21 2. On March 14, 2011, the Minnesota Pollution Control Agency (MPCA) published a
22 major update to Minnesota Rules, Chapter 7080 through 7083, governing
23 Subsurface Sewage Treatment Systems (SSTS). Minor revisions were also
24 made in January 2014. Washington County was required to revise and
25 implement an SSTS Ordinance in compliance with Chapter 7080, 7081, 7082_ ,
26 and 7083.
27
28 3. The Washington County Department of Public Health and Environment proposed
29 to amend their SSTS Ordinance, particularly adding a section for land spreading
30 septage. The County's proposed land spreading septage regulations are stricter
31 than MPCA's Chapters 7080 or 7081 and are new to the County's SSTS
32 Program. A summary of the new SSTS requirements are highlighted below:
33
34 . Incorporates oversight of land spreading septage activities in compliance with
35 federal regulations and state guidelines;
36 . Allows Washington County Dept. of Public Health and Environment to access
37 site suitability;
38 . Will require a permit prior to land spreading septage;
39 . Implements policy outlined in the Washington County's Groundwater Plan;
40 . Reduces reporting time from 12 months to 90 days;
41 • Requires maintainers to obtain blank `permit' prior to tank maintenance; and
42 . Will reduce confusion for homeowners.
43
44 4. The City of Cottage Grove has concerns for allowing land spreading septage
45 within the Cottage Grove municipal boundaries and with the adoption of this
46 ordinance prohibits land spreading septage within the City of Cottage Grove for
47 the following reasons:
Ordinance No. XXX
Page 2 of 4
48
The City of Cottage Grove understands that Washington County will
49
• Based on Washington County's Groundwater Plan 2014 -2024, the
50
majority of the bedrock sensitivity within the City of Cottage Grove is
51
identified as "High- Moderate ", "High ", and "Very High ".
52
further understands that if the County decides to allow land application of
53
• Based on Washington County's Groundwater Plan 2014 -2024, the
54
majority of the water table sensitivity within the City of Cottage Grove is
55
identified as being "High" and "Very High ".
56
features of the area.
57
• Based on the Washington County's Groundwater Plan 2014 -2024, the
58
majority of the infiltration potential within City of Cottage Grove is identified
59
as "High" and "Very High ".
60
61
• As referenced in the Washington County Groundwater Plan 2014 -2024,
62
past studies have shown higher concentrations of nitrates and other
63
pollutants in areas of high density septic systems. For example, a
64
February 2000 study by the MPCA evaluated contamination related to
65
SSTS beneath an unsewered portion of southeast Washington County.
66
The southeast area in Washington County was chosen for study based on
67
the higher sensitivity of bedrock, water table, and groundwater systems to
68
contamination.
69
70
The City of Cottage Grove understands that Washington County will
71
develop a county wide assessment that utilizes geologic data, nitrate
72
testing /mapping, housing stock data, and a community approach to
73
determine risk levels of existing systems throughout the county. The City
74
further understands that if the County decides to allow land application of
75
untreated domestic septage, the County will develop and implement a
76
rigorous regulatory program to ensure the process is done safely and
77
protective of county surface and groundwater.
78
features of the area.
79
The Minnesota Department of Health in November of 2006 tested the
80
City's 11 municipal wells for perfluorochemicals (PFC's). The City's public
81
water supply system was found to have various PFC's concentrations
82
below the health based value. Since the discovery of these chemicals the
83
Minnesota Pollution Control Agency and the Department of Health have
84
been actively monitoring and modeling the contamination plume. The
85
contamination plume is wide spread in City's Drinking Water Supply
86
Management Area (DWSMA) due to the bedrock geology and karst
87
features of the area.
88
89 5. There are unanswered questions about the safety, environmental effects, and
90 propriety of land spreading septage, even when the septage is applied in
91 accordance with federal, state and local regulations. Septage contains heavy
92 metals, pathogenic organisms, and chemical pollutants, which may pose an
93 unknown degree of risk to public health, the environment, and groundwater.
Ordinance No. XXX
Page 3 of 4
94
There is a lack of adequate scientific understanding concerning the risk that land
95
application of septage may pose to soils, air, water, human, plant, and animal
96
health. In order to adequately protect the public health and the safety and welfare
97
of Cottage Grove and its residents and its public water supply, it is the intent of
98
this ordinance that the land spreading of domestic septage shall be prohibited in
99
the incorporated area of Cottage Grove, Washington County, Minnesota.
100
101 6. The Minnesota Statutes 7080 through 7083 and Washington County's septic
102 ordinance regulates the location, design, installation, use and maintenance of
103 SSTS. These regulations provide communities the opportunity to adopt and
104 enforce their own ordinances, but SSTS Ordinances in cities must be as
105 restrictive as the County's SSTS Ordinance.
106
107
108 SECTION 2. AMENDMENT "The Code of the City of Cottage Grove, County of
1o9 Washington, State of Minnesota," shall be amended by adding subsection "O" in Title 4 -1 -3
110 with the following:
111
112 Title 4, Public Health and Safety
113 Chapter 1, Nuisances
114 Section 3, Nuisances Affecting Health
115
116 Subsection O. Land spreading domestic septage on any property within the incorporated
117 areas of Cottage Grove, Washington County, Minnesota.
118
119
120 SECTION 3. AMENDMENT "The Code of the City of Cottage Grove, County of
121 Washington, State of Minnesota," shall be amended by replacing Title 8, Chapter 2,
122 Individual Sewage Treatment Systems by adding section 8 -2 -4 to read as follows:
123
124 Title 8, Water and Sewer
125 Chapter 2, Individual Sewage Treatment Systems
126
127 8 -2 -4: Land Spreading Domestic Septage Prohibited: No person or entities shall land
128 spread domestic septage on any property within the incorporated areas of Cottage Grove,
129 Washington County, Minnesota.
130
131
132 SECTION 4. AMENDMENT SUMMARY PUBLICATION. Pursuant to Minnesota
133 Statutes Section 412.191, in the case of a lengthy ordinance, a summary may be
134 published. While a copy of the entire ordinance is available without cost at the office of the
135 City Clerk, the following summary is approved by the City Council and shall be published in
136 lieu of publishing the entire ordinance: "Land spreading domestic septage is prohibited
137 within the City of Cottage Grove and the City of Cottage Grove has adopted and
138 incorporated by reference the Washington County's Development Code, Chapter Four,
139 Subsurface Sewage Treatment System Regulations (Washington County Ordinance No.
Ordinance No. XXX
Page 4 of 4
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
XXXXXXXXXX), except for land application of septage within the incorporated areas of
Cottage Grove, Washington County, Minnesota."
SECTION 5. EFFECTIVE DATE This ordinance shall be in full force and effect from
and after its passage and publication according to law.
Passed this 1st day of April, 2015.
Attest:
Myron Bailey, Mayor
Caron M. Stransky, City Clerk
Published in the South Washington County Bulletin on [Date].
WASHINGTON COUNTY
DEVELOPMENT CODE
Pursuant to MSA Ch 394, Washington County has adopted official controls for the purposes of regulating the
physical development of land in the unincorporated areas of the County. These official controls are compiled into
and hereafter known as the Washington County Development Code and consists of the following chapters each
adopted by Ordinance.
(1)
Chapter One
Administration
(2)
Chapter Two
Zoning Regulations
(3)
Chapter Three
Subdivision Regulations
(4)
Chapter Four
Subsurface Sewage Treatment System Regulations
(5)
Chapter Five
Lower St. Croix River Bluffland and Shoreland Management Regulations
(6)
Chapter Six
Shoreland Management Regulations
(7)
Chapter Seven...
Mining Regulations
(8)
Chapter Eight
201 Sewer Use Regulations
(9)
Chapter Nine
Flood Plain Regulations
(10)
Chapter Ten
Official Map Regulation and Designation
Effective Septembe.r....2.3. 009 ..................................................................................... lMonthl. f. Dayj.,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
WASHINGTON COUNTY DEVELOPMENT CODE
CHAPTER FOUR
SUBSURFACE SEWAGE TREATMENT SYSTEM REGULATIONS
Table of Contents
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.... .... ....20
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: ......... ......... .........57
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... ... :. .... .....:.r ......:r
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.......:: .......:, ........ 8..
SR. .IC . TIE n TV. .... 1.77 V ..KTw .K.IC . .TAZ. ....WA, .. rV ....................................................................................................................................................................................................................................................................................................................................
.............................5.
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SECTION 1. PURPOSE AND INTENT .................................................................................... ............................... 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION DEFINITIONS ........................................................................................................ .............................12
2 .1 Certain Terms ..... ........................... ............. ............................... ....... ...........................12
2 .2 Definitions ........................................................................................................ .............................12
SECTION 3 ADMINISTRATION ............................................................................................. ............................... 26
Washington County Development Code
EffectiveSeptembe.r....2.3. 009 ................................................................. .................... Days.,.. fYearl..................................................................................................................... ............................... ........................Chapter
Four a Subsurface Sewage Treatment System Regulations
I
3.1
Administrative scope.. .., ............................ .......,........., .......,, ........,
................, .......,,........,26
4.4 .......
Compliance a . criteri for systems with a flow greater than 2 500 . galtons .. per day
30
3.3
Federal regulations ..... ............................... ... ...............................
.......... .............................26
3.3
Variance rocedures .........................................................................................
.............................26
3.4
Board of adjustment and a ......................................................................
.............................
3.5
Adherence to these standards .............. .............. ...............................
.. ........ .............................27
3.6
MSTS qualifications .........................................................................................
.............................27
3.7
Collection Systems ........................... ............... ...............................
....... .............................27
3....8 ..........
MSTS
..........32
3.9
SDS permit required ......................... .............. ...............................
....... .............................27
3.10
Other state regulations ........ ......... .......................... .....................
............ .............................28
3.11
Local re ...........................................................................................
.............................
3.12
Work done without permit .............. ......... .................. ..................
.................... ..................28
3.13
Authori zed access .........................................................................................
.............................28
3.14
Permit fees .....................................................................................................
.............................28
SECTION 4 COMPLIANCE CRITERIA ..................................................................................
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
............................... 29
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1
Treatment required .......................... ......... ..... ...............................
........ .............................29
4.2
Compliance criteria for new construction .........................................................
.............................29
4.3
Com pliance criteria for existing systems ....... ... ............................... .......... .............................29
4.4 .......
Compliance a . criteri for systems with a flow greater than 2 500 . galtons .. per day
30
4.5
Compliance criteria for systems receiving replacement components .... ....... .............................30
4.6
MSTS General .................................................................................................. .............................30
4.7
Public health and safet imminent threat ...................................................... ...............................
30
4.8
Groundwater protection ...................... ............... ............................... .. ....... .............................31
4.9
Other conformance ......................................................................................... ...............................
31
4.10
S ystem operation ........................... ................ ............................... ....... .............................32
4.11
Compliance criteria . for systems receiving . replacement . components . ........
..........32
4.12
U requirements ................................................................................... .............................
SECTION 5 ACCEPTABLE AND PROHIBITED DISCHARGES ........ .......... ......... ......... ......... ..................
33
5.1
Sewage ....... .................................................. ............................... ........ .............................33
5.2
$ stem influent ................................................................................................. .............................33
y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .......
5.3
Domestic waste ................................................................................................. .............................
SECTION6 PERMITS ............................................................................................................... ...............................
34
6.1
Building Permit requirements ............ ................ ............................... ........ .............................34
6.2
Compliant system or hermit issued ................................................................. ...............................
34
3 Washington County Development Code
6.7 Permit revocation .............................................................................................. .............................35
SECTION 7 OPERATING PERMITS ....................................................................................... ............................... 36
7.1 O perating permit required .................. ........ ........................... ......... ..... ............................... 36
7.2 Operating hermits issued .................................................................................. .............................36
7.3
Operating permit criteria ................... .............. ...............................
....... .............................36
7.4
Operating Permits ............................ ......... ..... ...............................
....... .............................36
7.5
MSTS Maintenance ........................................................................................
............................... 36
7.6
Grease Interceptors ............................ ......... ..... ...............................
.................. ..................37
7.7
Operation and Maintenance Manual ...............................................................
............................... 37
7.8 Groundwater Monitoring ................... ............. ............................... ......... .............................38
T Noncompliance........ 3 8
SECTION8 INSPECTIONS ...................................................................................................... ............................... 39
8 .1 Reauired inspections ......................... ............ ............................... ....... .............................39
8 .2
Time of inspections ........................... ................ ............................... ..... ...............................
39
8 3.......
..Inspection.schedulin.........
39
8.4
Work backfilled before inspection ............... ..... ............................... ..... ...............................
39
8 .5
Correction orders .............................................................................................. .............................39
8 .6
System placed into service ................................................................................ .............................
8 .7
De partment_ access ................. .................... ............... ..................... ....... ..
.............................39
8 .8
. . . . . . . . . . . . . . . ....................
As- builts ............................................................................................................ .............................40
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 .9
Disclosure ......................................................................................................... .............................40
8.10
Compliance inspection new or replacement ......... ....... ..........
.......... ........ .........40
8.11
Certificate of compliance; notice of noncompliance .................................... .............................
8.12
Compliance inspections; existing systems. ........ .............................41
8.13
Periodically saturated soil disagreements ..................................................... .............................43
SECTION 9 SITE EVALUATION AND SOIL TESTING ......... ......... ......... ......... .........
........ .................. 45
9.1
Design Phase I, Site Evaluation .................. ..... ............................... ....... .............................45
9.2
Preliminary Evaluation ....................... ......... ..... ............................... ..................
..................45
9.3 1 1 1 1 1
1 1 1 Field Evaluation................................................................................................ .............................45
9.4
Minimum Size, Soil Treatment Area . ........... ............... ..................... ....... ...
.............................46
9.5
Soil observations ............................................................................................... .............................46
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Four a Subsurface Sewage Treatment System Regulations
I
9.6
Soil descriptions for determination of limiting layers ....... .................. ...................
..................47
9.7
Determination of loading rate absorption area size .......
48
9.8
Phase I, Site Evaluation Reporting ..... ............... ............................... .................
...................49
9.9
Soil testin re uired ........................................................................................
. . . . . . . . . . . . .. 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
............................... 50
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.10
Qualifications ................................................................................................
.............................
9.11
Site Protection .............................................................................................
............................... 50
9.12
Utilities ..........................................................................................................
.............................51
9.13
Mound soil testing ... ...................... ................ ............................... ..... ...............................
51
9.14
Combliance ...................................................................................................
.............................51
9.15 Phase II Reporting ......................... .............. ............................... ..... ............................... 51
SECTION 10 MSTS SITE EVALUATION AND SOIL TESTING ........ .......... ......... ......... ......... ..................52
10.1 Necessity of Soil and Site Evaluations ........... ............................... ..... ............................... 52
10.2 Preliminary Evaluation ............................................................................... ............................... 52
10.3
Field Evaluation ..........................................................................................
............................... 52
10.4
Soil Description
53
10.5
Method ..........................................................................................................
.............................54
10.6
Comparison with Soil Survey ......... ...... ............................... .........
..... ............................... 54
10.7
Site and Soil Information ..............................................................................
.............................54
10.8
Flood Fringe ............ ............................... ... ...............................
........ ............................... 55
10 .9.....
Depth .........
55
10.10
Site Protection .............................................................................................
............................... 55
10.11....
Soil and _Site Report._ .,.......,�........� ........... ....... ........��........._........_.,
......, �.. ..............._._........_.,55
SECTION 11
GROUNDWATER INVESTIGATION ....... ........... ......... ......... ..........
......... ......... .................. 57
......................................................................t
11
Necessity of Invests anon
y................... ............................... .......................................................................................................................................................................................................................................................................................................................................
w g
............................... 57
11.2
Preliminary Investigation ................ ............. ...............................
........ .......... ...................57
11 .3......
Field or Further ......... ....... .......... ........... ......... .......
57
11.4
Monitoring ....................................................................................................
.............................
11.5 ....
Hydrological Interpretations . ......... ...... ............................... .......
.. ....... .............................58
11.6
Groundwater Rebort ....................................................................................
............................... 58
SECTION 12 SEWAGE FLOW DETERMINATION...... ......... ......... ......... ......... ........ ..................59
12.1 Design Phase II: System Design..... .............. ............................... ..... ............................... 59
12.2 Design Flow ...... ..... ............................... .................. .................. ................... .................. 59
12.3 Design Flow by Bedrooms .......................................................................... ............................... 59
12.4 Sum of design flow for existing dwellings .......... ............................... ........ ............................... 59
12.5 New housing develobments ........................................................................ ............................... 59
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Four a Subsurface Sewage Treatment System Regulations
I
12.6
Additional Capacity . ............................... .................. .................. ...................
.................59
12.7
Design Flow Determination for Other Establishments
59
12.8
Employees in Design Flow Calculation ..... ... ............................... ........
............................... 63
12.9
. . . . . . . . . . . . . . . . . . . . . .........................
Measured Flow ............................................................................................
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
............................... 63
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.10
Infi ltrati on ...................................................................................................
............................... 63
12.11
Waste Concentration .....................................................................................
.............................63
SECTION13
SEWAGE TANKS ...............................................................................................
............................... 64
13 .1......
Sewage General .........
64
13.2
Tank Strength Requirements .......... .............. ............................... .......
.............................64
13.3
Poured -in -place concrete Tanks ................. .... ............................... .. ...... ...............................
64
13.4
Septic Tank Design .....................................................................................
............................... 64
13.5
Minimum I I Tank Capacitv ..............................................................................
.............................64
13.6
Common tanks ............................................................................................
............................... 65
13.7
Se ptic tank capacity for multiple dwellings ... ............................... .........
.............................65
13 8
Septic tank capacity other estab
.........
13.9
Holding I Tank Ca pacit y I for Other Establishments ........................................
.............................
13.10
Effluent Filters_ Required .................. ............... ............................... .. .......
.............................66
13.11
Tanks connected in series .............................................................................
.............................66
13.12
Prior to other treatment devices ..................................................................
............................... 66
13 .1.3...
Compartmentahzahon Single Tanks.........
66
13.14
Septic Tank Baffles ....................... .............. ............................... ..... ...............................
66
13.15
Sewage Tank Access ....................... ..................... ............................... ..........
............................... 67
13.16
Pump I Tank Access, . ......................................................................................................
1 67
13.17
Maintenance Hole Risers to Grade .............................................................
............................... 67
13.18
Maintenance Hole Covers ...........................................................................
............................... 67
13.19
Concrete Tank Construction .........................................................................
.............................68
13.20
Non - Concrete Tank Construction .................................................................
.............................68
13.21
Precast Reinforced I Concrete I Tank .............................................................
68
13.22
Other Tanks .................................................................................................
............................... 68
13.23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location and installation of tanks:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
13.24
Tank Assessment .........................................................................................
............................... 69
13.25
Tank Identification ......................................................................................
............................... 70
13.26
Sewage Tanks for MSTS, General ........... ..... ............................... ..... ...............................
70
13.27
MSTS Septic Tank Cabacitv .........................................................................
.............................71
6 Washington County Development Code
EffectiveSeptemb e. r.... 23. 3 .... 20 09 ................................................................. .................... Days.,.. fYearl.....................................................................................................................
............................... ........................Chapter
Four a Subsurface Sewage Treatment System Regulations
16.8
MSTS Design Standards .................. ..................... ...............................
............. .............................87
13.28
MSTS Tank Geometry ................... ......... ..... ...............................
.................. ..................71
13 .3.0..
MSTS Tank Testing.......
......... .........
13.31
MSTS Liners .................................................................................................
.............................72
SECTION
14 DISTRIBUTION OF EFFLUENT ..........
73
14.1
General.. . ..... ............................... .............. ...............................
...... .............................73
14.2
....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Supply Pipes ................................................................................................
............................... 73
...............................
14.3
Gravity Distribution ...................... ................ ...............................
...... ............................... 73
14.4
Pressure Distribution .....................................................................................
.............................75
14.5
Distribution of Effluent for MSTS ..............................................................
............................... 77
14.6
Pressure Distribution Required for MSTS ...... ............................... _.
...... ............................... 77
14.7
MSTS Zones Required ..................................................................................
.............................
SECTION
15 DOSING OF EFFLUENT ....................................................................................
............................... 78
15.1
General ... ..... ............................... .............. ...............................
....... .............................78
78
15.3
Pumps for Gravity Distribution .....................................................................
.............................
15.4
Pumps for Pressure Distribution ....... ..................... ...............................
......... ............................... 79
15.5
.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Pump Discharge Head .................................................................................
............................... 79
...............................
15.6
Maximum Dose Volume .............................................................................
............................... 79
SECTION
16 TREATMENT AND DISPERSAL
80
16.1
General ... ..... ............................... .............. ...............................
....... .............................80
16.2
General Technical Requirements for All Systems ......................................
............................... 80
16.3
Other Technical.Requirements for Systems...... .......... ..................
................... .................81
16 4 ........
Nitro en BMP
......... ......... ......... ...
85
Final treatment and dispersal for MSTS: ...........................................
...... ............................... 85
16.6
Collection Systems ........................................................................................
.............................87
16.7
Construction Requirements .........................................................................
............................... 87
16.8
MSTS Design Standards .................. ..................... ...............................
............. .............................87
16.9
..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Prohibited Discharges .................................................................................
............................... 87
...............................
16.10
Component Longevity ................... ............... ...............................
...... ............................... 88
16.11
Flow Measurement Device .........................................................................
............................... 88
16.12
System Access .............................. .............. ...............................
..... ............................... 88
16.13
Registered Products
88
16.14
Designer Inspections ...................................................................................
............................... 88
SECTION
17 TYPE I SYSTEMS ...............................................................................................
............................... 89
17.1
T I S ystems ............................ ......... ..... ...............................
....... .............................89
7 Washington County Development Code
EffectiveSeptemb e. r.... 2. 3. 3 .... 20 09 ................................................................. .................... Days.,.. fYearl..................................................................................................................... ............................... ........................Chapter
Four a Subsurface Sewage Treatment System Regulations
I
17.2 Trenches and Seepage Beds ............ ......... ..... ............................... .................. ..................89
17.3 Mounds .......................................................................................................... .............................90
17.4 At- Grade Systems .... ............................... ... ...............................
........ ............................... 94
SECTION 18 TYPE II SYSTEMS .............................................................................................
... ........ ......... ......... ........
............................... 98
18.1 Type II Sy sterns, ........... .............. ......... .................. ..................
.................... ....................98
18.2 Floodalain Areas .........................................................................................
............................... 98
18.3 Privies ............................................................................ ............................... ............................100
18.4 Holding Tanks ............................................................... ............................... ............................100
SECTION 19 TYPE III SYSTEMS .......................................................................................... ............................... 102
19.1 Tvbe III Systems ........................... .............. ............................... ...... ............................102
19.2 1 1 1 1 1
1 1 1 1 1 1 Flow Restriction Device. .............................................. ...............................
............................102
19 .3......
Previously Developed
102
19.4
T ype III Systems Allowed .............. ............. ...............................
......... ............................102
19 .5.....
Graywater
............................109
.... .... .... .... .....
SECTION 20 TYPE IV SYSTEMS ..........................................................................................
............................... 104
20.1 ......
General .. ..... ............................... .............. ...............................
...... ............................104
20.2
Previously Developed Sites ........... ............. ...............................
......... ............................104
20.3
Tvbe IV Systems Allowed ............................................ ...............................
............................104
20.4 Soil Loading Rates .. ............................... ..... ...............................
...... ............................106
SECTION 21 TYPE V SYSTEMS ...........................................................................................
............................... 107
21.1 T ype V Systems ..... ............................... .................. ........,
......... ................., ........,.......107
21.2 Previously Developed Sites .......................................... ...............................
............................107
21.3 Type V Systems Allowed .............. .............. ............................... ...... ............................107
SECTION 22 MAINTENANCE .............................................................................................. ............................... 108
........ ........ ......... ......... ......... ......... ........ ..
22.1 Management Plans Required ..................... ....... ............................... ........ ............................108
22.2 General .......................................................................... ............................... ............................108
22.3
Frequency of Assessment ................ ............. ...............................
......... ............................108
22.4
Maintenance Permit and Reporting
................
22.5
Removal of Material ..................................................... ...............................
............................108
22.6
Pump Tank Maintenance .............................................. ...............................
_ .... .... .... .... .... .... .... .... ....
............................109
.... .... .... .... .....
22.7
Privies ............................................................................ ...............................
............................109
22.8
Additives ....................................................................... ...............................
............................109
22.9
Se to e .......................................................................... ...............................
............................109
22.10
Land Spreading of Septage ............. ............. ...............................
......... ............................109
22.11
Use of Soil Treatment Site ............................................ ...............................
............................109
22.10
System Remediation ..................................................... ...............................
............................110
8 Washington County Development Code
23.3
Permit A ........................................................ ...............................
............................
23.4
Duration of Permit ........................................................ ...............................
............................112
23.5
. . . . . . . . . . . . . . . . . . . . . .........................
Maximum Volume ........................................................ ...............................
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
............................112
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23.6
Requirements for Land Application Sites .. ... ...............................
.......... ............................112
23.7
S . oil Suitability....
.......
23.8
Required Application Methods ................ ..... ...............................
...... ............................113
23.9 ....
Slope Restrictions . ............................... .. .... ...............................
.. ....... ............................113
23.10
Setback Requirements ................................................... ...............................
............................
23.11
Reporting Requirements ................. ......... .................. ...................
..................... ................114
SECTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24 SYSTEM ABANDONMENT .............................................................................
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
............................... 116
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24.1
Tank Abandonment ....................................................... ...............................
............................116
24.2 Future Discharge ........................................................... ............................... ............................
24.3 Removal _of System .......................... ...................... ............................... ....... ...............................
116
24.4 MSTS Abandonment ..................................................... ............................... ............................116
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 25 PRODUCT REGISTRATION ......... ......... ......... ......... ......... ......... ......... ........
................. 117
25.1 Product Registration in Compliance with State Rules ..................... ....... ...........................117
25.2 Registered Products Approved by the Local Unit of Government ...... .......... ............................117
SECTION 26 ENFORCEMENT .............................................................................................. ...............................
118
26.1 Misdemeanor . ............................... .............. ............................... ...... ............................118
26.2 Corrective Actions Required .......... .............. ............................... ...... ............................118
26.3 Public Health NuisanceControl .................................... ............................... ............................118
SECTION 27 SEPARABILITY ............................................................................................... ...............................
118
27.1 ...... Separability ... ............................... .............. ............................... .. ...............................
...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
............................... 118
SECTION 28 Repeal of Chapter Four of the Washington County Development Code . ......... .........
.................... 118
28.1 Repeal ......... ..... ............................... .............. ............................... ...... ............................118
SECTION 29 EFFECTIVE DATE ........................................................................................... ...............................
118
29.1 Effective Date of Ordinance. ........ . .............. ............................... ...... ............................118
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WASHINGTON COUNTY DEVELOPMENT CODE
CHAPTER FOUR
SUBSURFACE SEWAGE TREATMENT SYSTEM REGULATIONS
This chapter shall regulate the location, design, installation, use and maintenance of subsurface sewage treatment
systems in all areas of Washington County other than cities and towns that have adopted ordinances that comply
with Minnesota Statute 115.55 and are as strict as this Chapter. This chapter is authorized under Minnesota Statute
Section 115.55 and 115.56 and Minnesota Statutes Chapter 145A.
SECTION 1. PURPOSE AND INTENT
Purpose Intent.
This Chapter is adopted for the following purposes:
(1) To protect the public health, safety, and general welfare by the discharge of adequately treated
sewage to the groundwater via the proper location, design, installation, use, and maintenance of
individual subsurface sewage treatment systems (ISTS) and midsized subsurface sewage treatment
systems (MSTS).
(2) These environmental protection standards shall be adopted county wide and administered and
enforced by the Department or local units of government as directed by Minnesota Rules, Chapter
7082, and Minnesota Statute, Section 115.55.
(3) This chapter does not regulate systems that dowill not receive sewage as defined in this chapter. If
systems receive both sewage and nonsewage, the requirements of this chapter apply, plus any
additional requirements governing the nonsewage portion of the wastewater.
(4) To provide prescriptive design, construction, and operational standards to reasonably protect
surface water and groundwater and promote public health, safety, and general welfare.
(5) To protect individual water supply wells of the community from contamination by inadequate,
improperly designed, located, installed or maintained subsurface sewage treatment systems.
(6) To provide for the orderly development of areas of the community which are not served by central
public wastewater treatment systems and to reduce the need to install central public wastewater
treatment systems in areas where they are not now currently planned.
(7) Technology and products employed in system design shall adequately protect the public health and
the environment as determined by Minnesota Rules, Chapter 7083, and be approved for use by the
Department or local unit of government.
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(8) ......................... This Chapter-does not intend to impose design standards for sewage_ treatment systems that
discharge to the ground surface or surface waters. Those systems require a National Pollution
Dischar S ystem permit. 111,11,11,1111
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SECTION 2. DEFINITIONS
2.1 Certain Terms.
For the purposes of this Chapter, certain terms or words used are interpreted as follows: the words "shall" and
«
must � are mandatory and the words "should" may � are permissive. All �lpstances specif�ed in -this Chapter are
ho-* -„t l A+nt,n^ c ,, —I-�n .. +h ^rc ,+,P ,— P^+�PCI.
.....� ...—.x.,, u....,,,,, .,. .,,., „F'—
2. Definitions.
For the purpose of this Chapter, the certain words and phrases are defined as follows:
(1) Absorption area. "Absorption area" means the design_parameter that is associated with the
hydraulic acceptance of effluent. It is -o ..
The
absorption area for a mound systemsystems is the original soil below a mound system that is
designed to absorb sewage tank effluent. The absorption area for trenches, seepage beds, and at-
grade systems is the soil area in contact with the part of the distribution medium that is designed
and loaded to allow absorption of sewage tank effluent. This includes both bottom and sidewall
soil contact areas.
(2) Agency. "Agency" means the Minnesota Pollution Control Agency (MPCA).
(3) Alarm device. "Alarm device" means a device that alerts a system operator or system owner of a
component's status using a visual or audible device. An alarm device can be either on site or
remotely located.
(4) Applicable requirements. "Applicable requirements" means:
(A) This Chapter; Minnesota Rules, Chapter 7082; and, Minnesota Statutes, section 115.55; or
(B) In areas of the County without complying ordinances to regulate SSTS, the requirements in
this Chapter.
(5) As- builts. "As- builts" means drawings and documentation specifying the final in -place location,
size, and type of all system components. These records identify the results of materials testing and
describe the conditions during construction. An as -built also contains a certified statement.
(6) ASTM. "ASTM' means the American Society for Testing and Materials.
(7) At -grade system. "At -grade system" means a pressurized soil treatment and dispersal system
where sewage tank effluent is dosed to an absorption bed that is constructed directly on original soil
at the ground surface and covered by loamy soil materials.
(8) Baffle. `Baffle" means a device installed in a septic tank to retain solids and includes, but is not
limited to, vented sanitary tees with submerged pipes and effluent screens.
(9) Bedrock. "Bedrock" means geologic layers, of which greater than 50 percent by volume consists
of unweathered in -place consolidated rock or rock fragments. Bedrock also means weathered in-
place rock which cannot be hand augered or penetrated with a knife blade in a soil pit.
(10) Bedroom. "Bedroom" means, for the sole purpose of estimating design flows from dwellings, an
area that is:
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(A) a room designed or used for sleeping; or
(B) a room or area of a dwelling that has a minimum floor area of 70 square feet with access
gained from the living area or living area hallway. Architectural features that affect the use
as a bedroom under this item may be considered in making the bedroom determination.
(11) Biochemical oxygen demand or BOD. `Biochemical oxygen demand" or `BOD" means the
measure of the amount of oxygen required by bacteria while stabilizing, digesting, or treating
biodegradable organic matter under aerobic conditions over a five -day incubation period,
commonly expressed in milligrams per liter (mg /L).
(12) Building. `Building" means any structure used or intended for supporting or sheltering any use or
occupancy.
(13) Building sewer. `Building sewer" means the part of the drainage system which extends from the
end of the building drain and conveys its discharge to a subsurface sewage treatment system.
(14) Capillary fringe. soil layer directly above a saturated layer in which
the pore s are nearly filled with water as water is drawn upward due to adhesive and cohesive
forces.
I I A 15 ..........Carbonaceous biochemical oxygen demand or CBOD "Carbonaceous biochemical
oxygen demand" or "CBOD means the measure of the amount of oxygen required by bacteria
while stabilizing, digesting, or treating organic matter under aerobic conditions over a five -day
incubation period while in the presence of a chemical inhibitor to block nitrification. CBOD is
commonly expressed in milligrams per liter (mg /L).
............Certificate of compliance. "Certificate of compliance" means a document, written after a
_ y 1,6
compliance inspection, certifying that a system is in compliance at the time of inspection with
applicable requirements at - the
i 1 . _ )(17) .. . ... ... ... .Certified. "Certified" means an individual is included on the Agency's SSTS certification
list and is qualified to design, install, maintain, repair, pump, operate, or inspect an SSTS as
appropriate with the individual's qualifications. A certified individual who is working under a
license is subject to the obligations of the license. Certified individuals were previously known as
registered professionals.
07)(1 ...... Certified statement. "Certified statement" means a statement signed by a certified
individual, apprentice, or qualified employee under Minnesota Rules, Chapter 7083 certifying that
the licensed business or qualified employee completed the work in accordance with applicable
requirements.
0Q)(19� Cesspool. "Cesspool" means an underground pit, receptacle,_ leaching pit, drywell, seepage
pit, or seepage tank that receives sewage and leaches sewage into the surrounding soil, bedrock, or
other soil materials. Cesspools include sewage tanks that were designed to be watertight, but
subsequently leak below the designed operating depth.
(2 0) Clean sand. "Clean sand" means a soil fill material required to be used in mounds. The
standards for clean sand are outli- edset forth in Section 17.3 (103)(C).
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(2q)(21) Commissioner. "Commissioner" means the commissioner of the Minnesota Pollution
Control Agency.
................ .....................Compliance inspection. "Compliance inspection" means an evaluation, investigation,
inspection, or other such process for the purpose of issuing a certificate of compliance or notice of
noncompliance.
(2.2)(23) Contour Loading Rate. "Contour Loading Rate" ismeans the amount of effluent loaded
to the soil per length of the dispersal unit or units along the single hillslope along the contour. The
contour loading rate is determined on the relationship between the vertical and horizontal water
movement in the-soil and is based on the permeability difference between the absorption area and
any deeper horizons, the depth between the absorption area and the change in permeability; and the
land slope.
02)(24) ................. ....................Department. "Department" means the Washington County Department of Public Health
and Environment.
r� .............
(25) Desi flow the estimated or measured flow used to desig the SSTS.
(2) 0(26) Disinfection. "Disinfection" means the process of destroying or inactivating pathogenic
microorganisms in sewage to render them noninfectious.
(21 5)(27 . .............. .... Distinct. "Distinct" means a soil color that is not faint as described in Section 2.2 (39).
(265 )(28 ..................................... Distribution box. "Distribution box" means a device intended to distribute sewage tank
effluent concurrently and equally by gravity to multiple segments of a soil dispersal system.
(27)(29) v Distribution device. "Distribution device" means a device used to receive and transfer
effluent from supply pipes to distribution pipes or downslope supply pipes, or both. These devices
include, but are not limited to, drop boxes, valve boxes, distribution boxes, or manifolds.
f28 ...... __Distribution medium. "Distribution medium" means the material used to provide void
space in a dispersal component, through which effluent flows and is stored prior to infiltration.
Distribution media includes, but is not limited to, drainfield rock, polystyrene beads, chambers, and
gravelless pipe.
09)(31 . Distribution pipes. "Distribution pipes" means perforated pipes that distribute effluent
within a distribution medium.
r�w(32) Domestic strength waste. "Domestic strength waste" means liquid waste produced by
\. J
toilets, bathing, laundry, culinary operations, and the floor drains associated with these sources, and
includes household cleaners, medications, and other constituents in sewage restricted to amounts
normally used for domestic purposes. Domestic waste has a biochemical oxygen demand of
7.5170 mg/L or less ochem cal oxygen demand of a total
suspended solids level of 65 .5650 mg /L or less, an oil and grease concentration of 25 mg /L or less and
no hazardous wastes. Animal waste and commercial or industrial waste are not considered
domestic waste.
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(3 Drip dispersal system. Drip dispersal system means a small diameter pressurized
�� ��
wastewater distribution system in which the treated effluent is distributed under pressure to the
infiltrative surface via drip tubing and enters the receiving environment.
'32` 34 Drop box. "Drop box" means a distribution device used for the serial gravity application
p P g Y PP
of sewage tank effluent to a soil dispersal system.
(33)(35) Dwelling. "Dwelling" means any building with provision for living, sanitary, and sleeping
facilities.
I 34` 36 Effluent screen. "Effluent screen" means a device installed on the outlet i piping of a se tic
P
tank for the purpose of retaining solids of a specific size.
(35)(37) EPA. "EPA" means the United States Environmental Protection Agency.
✓f •�. i.Yt'Yi YJL.Y Yk lY l.Y tYYY. " "' E �'''... ., ie, � >... �'. :.'� lllV Lll\JlY L1YiL1� up Vll "L'v LY V iLLYVYl Vl IYlV ✓✓ lti
re -41ably.- distrpbute's.-effluent Ov. er'.'the e'ntire.. -required -- absorptmn "'area..
(36)(38) Existing system. "Existing system" means a system that has been previously inspected
and approved by the Department or local unit of government during installation. In addition, all
operating systems installed before the adoption of this Chapter are considered existing systems.
(3'7')(39) Faint. "Faint" means a soil colorin the Munsell Soil- Color _Charts:
(A) with the same hue as another soil color but that varies from the other color by two or less
units of value and not more than one unit of chroma;
(B) that differs from another soil color by one hue and by one or less units of value and not more
than one unit of chroma; or
(C) that differs from another soil color by two units of hue with the same value or chroma.
Fecal coliform or FC. "Fecal coliform" or "FC" for the purposes of th Chapter, means
bacteria common to the digestive systems of humans that are cultured in standard tests. Counts of
these organisms are typically used to indicate potential contamination from sewage or to describe a
level of disinfection, generally expressed in colonies per 100 mL.
(3 °)(41) ...... __Fine Sand. "Fine sand" means a soil texture, as described in the Field Book for Describing
and Sampling Soils, which is incorporated by reference in Section 2.2 (46) where more than 50
percent of the sand has a particle size range of 0.05 millimeters which is a sieve size of 270, to 0.25
millimeters which s_a sieve size 60.
(40(42 . Flood fringe. "Flood fringe" means that portion of the floodplain outside of the floodway.
Fl ood fringe IJ YYY" synonymous with the Y Yi�J"�U IY' "R11.9 U1CL11Ge 1.P i:IACA�" Y�[}1 " "V W''iY.J.YYYY5GV11 iilJ�CiYYY�" " "CYYYlY
..... .................. ....................... ...............................
aor +;�o a r +ho Ul--A D_ ,.... --A U1__,a.r..,y...n4.,p- `floodway fringe od
.. ..''...
............................ . ...............................
insurance studies.
(-41)(43) Floodplain. " Floodplain" means the area covered by a 100 -year flood event along lakes,
rivers, and streams as published in technical studies by local, state, and federal agencies, or in the
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absence of these studies, the estimates of the 100 -year flood boundaries and elevations as
developed according toby Washington County.
( 4 L)(44....................................... Floodway. "Floodway" means the bed of a wetland or lake, the channel of a watercourse,
and those portions of the adjoining floodplain that are reasonably required to carry the regional
flood discharge.
(43)(45) Flow measurement. "Flow measurement" means any method used to accurately measure
water or sewage flow, including, but not limited to, water meters, event counters, running time
clocks, or electronically controlled dosing.
(44;(46) Geomorphic description. "Geomorphic description" means the identification of the
landscape, landform, and surface morphometry of the proposed area of the soil treatment and
dispersal system as described in the Field Book for Describing and Sampling Soils: Version 2.0
(2002), developed by the National Soil Survey Center and Natural Resources Conservation Service
of the United States Department of Agriculture. The field book is incorporated by reference - is - opt
subject to frequent change.., and is. available through the. initex -interlibrary loan. syste m into this
ordinance.
e.4 s)(4 7 ........... Graywater. " Graywater" means sewage that does not contain toilet wastes. Liquid wastes
from a dwelling or other establishment produced by bathing, laundry, culinary operation, and from
floor drains associated with these sources are considered graywater.
(46)(48) ............... Graywater system. " Graywater system" means a system that receives, treats, and
disperses only graywater or other similar sy , .tem ass_ystems designated as such by the
commissioner.
(47)(49) ............Groundwater mound. "Groundwater mound" means the rise in height of the periodically
saturated soil or regional water table caused by the addition of sewage effluent from a subsurface
sewage treatment system into the soil.
(48)(50) ............ waste. "Hazardous waste" means any substance that, when discarded, meets
the definition of hazardous waste in Minnesota Statutes, section 116.06, subdivision 11, Minnesota
Rules 7045, or the Washington County Hazardous Waste Management_ Ordinance No 166.
(40)(51) Holding tank. "Holding tank" means a tank for the storage of sewage until such time as it
can be transported to a point of treatment and dispersal. Holding tanks are considered a septic
system tank -tanks under Minnesota Statutes, section 115.55.
(50)(52) v Individual subsurface sewage treatment system or ISTS. "Individual subsurface
sewage treatment system" or "ISTS" means sewage treatment system or part thereof,
as set forth in Minnesota Statutes, sections 115.03 and 115.5 5, that employs sewage tanks or other
treatment devices with final discharge into the soil below the natural soil elevation or elevated final
grade that are designed to receive a sewage design flow of 5,000 gallons per day or less. ISTS also
includes the.all holding tanks that.. are designed..to.. receive.. .a..design..flow..of..1.0,000... gallons...per.day.or
less; sewage collection systems and associated tanks that discharge into ISTS treatment and
dispersal components; and privies but. ISTS does not include any pump tanh� used in a s .rage
vviivvcxvii oy ucviii. iv i v uvvo iivc iiiviuuv - vuiiuiii� ov vvviu vi viivi vvxiiNviiexicu �
components defined as plumbing under Minnesota Rules, Chapter 4715, or sev.Tage c; llect °crY
systems
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(51)(53)_ Inner wellhead management zone. "Inner wellhead management zone" means the
drinking water supply management area for a public water supply well that does not have a
delineated wellhead protection area approved by the Department of Health under Minnesota Rules,
Chapter 4720, section 4720.5330.
(52)(54) _ _Invert. "Invert" means the lowest point of a channel inside a pipe.
!41 x„x,,: ent Threat to Publ He n> C.Lfo�.r
lTJ 1111111Y11�.LLL Threat Y uVI1V Y1�. LL1B11 VL
TcTc .x,1,; 1, A;- 111 ---- - e m"--+ A— , a --r— .ar,;
means ar. 1lJ'.' VV 111'Vli UYJ\,iY1U1 V ,...:Ye VW�iLge "Vr Je vV�age IYYUVI.L LV "Li1V ri JUY lYLVV� "UY UYYii1: 'V �T�'JLVYYY
A +,xl,on n +— x ,n +o n „,n v „o +lx,+ n,, o x ,n +ov• o l.n In
ixv r r n n .v o nn
L',iY'Ll%iYL✓3'j' VY ”. YLV' YY' YYtY: YV' Y" L', iY' Li: YY' Y: i "V'Y "UY'Yii'`i.%Y:Y ".Y LYi'Y'uti'v "WY"i YtY:Yi1'4 ' VY'Y%t1:LY'.YLi : i "i: VLL'VY1iXp'
a. aa. kn... sa .'..... .....h.ra...... ..aa....rx.1.�x..r`.+ ..n... ..... k,..... a.... rs�.'.... n. a-... xx�... n. 1. xxs�. �x... s�....ra.... L.. .....:k...aa.lr....xxaa.:kh..
...LV U uVV Viii l ii� ll Vi VLiiv vJLLLVii I J.uLLVii L, Vi ..UJ U.. v.vvL..vU. iiLL�.LLi V 11-1 VJ LL JV VVL5 Ltuui l VV ILii
ny} lxl'.CP nVxYO/'l......lx 7?t'Y72PA nY.xF�o ?lam 1'.'}.!11 rl +Pxt.!V.1'. f•P hnlo nnx�PY' /xr 1r{.. STS that has re - c - l i — 4 h� mrAnxxC.
1 S 1 U L..UL ..UJ .VVV.V VU ..LL/�U.UVLLJ
x ...nr U -1 y 1 ,....... � h LI - 1 ... ---- ,- -- ? �._1�......�
-.0, Vl VL11V. JU1V G Vl 11V U:Y UY 11LI:LUYU UJUVLV 1111111VU VyL11V JVRUL11V11LVU YYYI VIYYYIIV JVLU 11UY1 J
Chapter 7083..
(5) ........ISTS Lailingto .Lreitect.Groun€lwater:
Y. -11 r.n.Ea. spar.. n. na...... - .. y — �..nr.�.xt..TS.;..... I .. a. n.. o. n.* h. sxra.._# lasx.. rnn .laax.4xr:1.ara�r�txrxrx..l..
N.L, —OF-1 —..y vvV.., .VwV.....� F— V. --I" N.L, V. w .. 1v 1 v L..wL..wJ .VJJ L..LL.. —1 .VL�u..VU v V.L.Vw.
sPra�xrrx +xnn_c11A +�1rxl•P.._aA flPCnr -�l�Pr1.._x�rx...�'Pn:kl,can J I t "I'l�..Qr 5�.• ,rvr_ra.�rx...T�'T�'.._�rxn.+ rxl� nfln.nPCl...x.-- r,rl�mi.rP
JVNw. _.. u.JLw..VV wJ uV.1V..vvu ... vvVL.V.. — � —f w ���, V. w.. 1v 1 v ..VL wvLU.uV..VU ... wvvV. uLU.VV
xx,; +h CPn +;n,, 72• nr �1,x, thPr +hrP r +n ,rn,,,, ax.,� +Pr nxxnl; +x, nn �P +Pr,,;1,P� hx, +hnnP — +hnr
vV.L.. 3 --,, Vl — .Y — 1 - 1 L111 LV �.vu..0 vv ucV. Ll uJ uVLV...l...VU Vy - L..VJV - uuu.V.rc,VU YYY
A i; ------ n P,x1PA C h.x. -.+or 709Q
YV Yl.lYYG�VLU Y'CUYV �, +C'i1YU13 LVY "l'VVJ'
(55) Licensed advanced _design business. means a business that
is authorized to conduct site and soil evaluations- sv_ stems, and write management plans for
all sizes and types of SSTS up to 10,000 gallons per da y.
(56) Licensed advanced inspection business. : means a business
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
that . is to comphance and issue of compliance and
notices. of noncompliance for all sizes and types of SSTS up to..10 000 gallons per.day..
(57) Licensed basic design business. means a business that is
authorized to conduct site and soil evaluations, design systems, and write management plans for a
Type I, II or III ISTS as described in Section 17 to Section 19 serving dwellings or other
establishments with a design flow of 2 ,500 g allons per da or less.
(58) Licensed installation business
........ .......................................
authorized to construct, install, alter, extend, or repair all SSTS according to an approved design.
(59) Licensed basic inspection business. means a business that
is authorized to conduct compliance inspections and issue written certificates of compliance and
notices of noncom for an existin Typ I, II, or III ISTS as described in Section 17 to
Section 19 serving dwellings or other establishments with a design flow of 2,500 gallons per da or
W � _
(60) Licensed intermediate design business. ...: .
business that is authorized to conduct site , and soil evaluations, design systems, and write
management plans for a Type I, II, III, IV or V ISTS as described in Section 17 to Section 21
serving dwellings or other establishments with a design of 2,500 gallons per day or less and
m
has doestic strength waste.... Y u _
1 Licensed intermediate ins
6......) ................... ection business.
....... ....... .......: ........ ....... ....... .......
a business that is authorized to conduct compliance inspections and issue written certificates of
compliance and notices of noncompliance for an existing Type_ I, II, III, IV or V ISTS as described
in Section 17 to Section 21 serving dwellings or other establishments with a design flow of 2,500
gallons per day or less and has domestic strength waste.
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(62) ........... Licensed maintainer business.
authorized to measure scum and sludge depths in sewage tanks for the accumulation of solids and
removing these deposits, remove solids and liquids from toilet treatment devices, trans
septage, land a pply septaR or dispose of se ptag e in a treatment facilit identif problems related
to sewage tanks baffles maintenance hole covers extensions,.a....d mps. and make. the. repairs,
evaluate sewage tanks, pump tanks, distribution devices, valve boxes, or drop boxes for leakage;
identify cesspools, seepage pits, leaching pits, and drywells; and clean supply pipes and distribution
pipes for all SSTS.
(63) Licensed service provider business. ' .
...
is authorized to measure scum and sludge depths for the accumulation of solids identify .. roblems
....g....... p ......... ......... �'........ ..........
related. tosewage.tanks baffles maintenance.. hole.covers,.extensions andpumps
and make the_ repairs; evaluate sewage tanks, dosing chambers, distribution devices, valve_boxes,_or
drop boxes for leakage; and clean supply pipes and distribution pipes.. Service provider businesses
are also authorized to assess, adiust, and service systems for proper operation, take, preserve, store,
and shi sam ples for anal ysis, interpret sam pling results and report results for an SSTS, and operate
sewage collections systems to an SSTS,.
(5-3)(64) Liquid capacity. "Liquid capacity" means the liquid volume of a sewage tank below the
invert of the outlet pipe or, for holding tanks and pump tanks, the liquid volume below the invert of
the inlet.
(54)(65) .. . ... ... ... .Long-term sewage treatment. "Long -term sewage treatment" shall mean enough space
on .a. lot .-rarea to. contain two Type I or Type II soil treatment and dispersal areas.
(55)(66) .. Lot. "Lot" means a parcel of land designated by metes and bounds, registered land survey,
plat or other means, and which description is either recorded in the Office of the Washington
County Recorder or Registrar of Titles or used by the County Treasurer or County Assessor to
separate such parcel from other lands for tax purposes.
(67) Maintenance permit. :;....... issued to a licensed maintainer
business prior to performing maintenance as described in Section 22._
(56)(68) Management plan. "Management plan" means a plan that requires the periodic
examination, adjustment, testing, and other operational requirements to meet system performance
expectations, including a planned course of action in the event a system does not meet performance
expectations.
(57)(69) Matrix. "Matrix" means the majority of the color in a soil horizon, as described in the
Field Book for Describing and Sampling Soils, which is incorporated by reference in Section 2.2
(46).
(58)(70) .. Midsized subsurface sewage treatment system or MSTS. "Midsized subsurface sewage
treatment system" or "MSTS" means subsurface sewage treatment system, or part
thereof, as set forth in Minnesota Statutes, sections 115.03 and 115.55, that employs sewage tanks
or other treatment devices with final discharge into the soil below the natural soil elevation or
elevated final grade and that is designed to receive sewage:. dv�cl. r �thcr eJUUltsM..exxts
with a design flow of greater than 5,000 gallons per day to 10,000 gallons per day. DesYgYY flovGs
must be determined by Section 12:7. MSTS also includes on -lot septiesewage collection systems
and associated tanks holding tasks, µ.rd pr:vics but domes not include -µ�:y pump
that discharge into MSTS treatment or dispersal components. MSTS
does not include those components defined as plumbing under Minnesota Rules, Chapter 4715 or
se vmge eVlievdon syste LYs.
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(59)(71)_ Mottles. "Mottles" means the minority of the variegated colors in a soil horizon, as
described in the Field Book for Describing and Sampling Soils, which is incorporated by reference
in Section 2.2 (46).
(641)(72) _Mound system. "Mound system" means a soil treatment and dispersal system designed
and installed such that all of the infiltrative surface is installed above grade, using clean sand
between the bottom of the infiltrative surface and the original ground elevation, utilizi ngutilizes
pressure distribution and capped with suitable soil material to stabilize the surface and encourage
vegetative growth.
(61)(73) MPCA. "MPCA" means the Minnesota Pollution Control Agency.
(62)(74) NPDES permit. " NPDES permit" means a National Pollutant Discharge Elimination
System permit issued by the MPCA.
(63)(75) New construction. "New construction" means installing or constructing a new ISTS or
altering extending or adding capacity toµ —xisti g sy s.....system that has been issued an initial
certificate of compliance.
_
04)(76) ... _ . _ . _ . Notice of noncompliance. "Notice of noncompliance" means a document written and
signed by a certified inspector after a compliance inspection that gives notice that an ISTS is not in
compliance with this Chapter.
05)(77) O &G. "O &G" means oil and grease, a component of sewage typically originating from
foodstuffs such as animal fats or vegetable oils or consisting of compounds of alcohol or glycerol
Withand fatty acids such as soaps and lotions, typically expressed in mg /L (also known as FOG, or
fats, oil and grease).
(78) Operating permit.
requires an operating permit as described in Section 7.
(66)(79) ............ high water level. " "Ordinary high water level" means the boundary of water
basins, watercourses, public waters, wetlands, and public waters wetlands and:
(A) the ordinary high water level is m the elevation delineating the highest water level that has
been maintained for a sufficient p riodlen0h of time as to leave evidence upon the
landscape, comYYY„YYIy the point where the YYLL ^aural vegetL ^tYoln 1-- ftom prvdv...... y
Ql�IiQLYG LV �tVUiJYYYYYYZLYt Liy LGit'v JLl latil�_.
(B) for watercourses, the ordinary high water level is the elevation of the top of the bank of the
channel; and
(C) for reservoirs and flowages, the ordinary high water level is the operating elevation of the
normal summer pool.
(67)(80) v Original soil. "Original soil' means naturally occurring soil that has not been cut, filled,
moved, smeared, compacted, altered, or manipulated to the degree that the loading rate must be
reduced from that associated with natural soil conditions.
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(68;(81) _ _Other establishment. "Other establishment" means any public or private structure other
than a dwelling that generates sewage that discharges into an ISTS or MSTS.
X69?) {82) ........... ..........................Other pit. "Other pit" means any pit or other device designed to leach sewage effluent that
is greater than 30 inches in height or has a bottom area loading rate of sewage greater than two
gallons per square foot per day.
(70)(83) Owner. "Owner" means any person having possession of, control over, or title to property
with an 1STSSSTS.
X71` 84 Parent material. "Parent material" means the unconsolidated and chemicall weathered
r �......... Y
geologic mineral or organic matter from which soils are developed bythrough soil forming
processes.
1 72)(85) ................. ....................Percolation rate. "Percolation rate" means the rate of a drop of water infiltrating into a
test hole as specified in Section 9.7 (2).
(73)(86) .. Periodically saturated soil. "Periodically saturated soil" means the highest elevation in
the soil that is in a reduced chemical state due to soil pores filled or nearly filled with water causing
anaerobic conditions. Periodically saturated soil is determined by the presence of redoximorphic
features in conjunction with other established indicators as specified in Section 9.6 (5) or (6), or
determined by other scientifically established technical methods or empirical field measurements
acceptable to the local unit of government in consultation with the Department or the
commissioner.
i A� 87 Permit. "Permit" means a buildinn colist —n tio�� sanitary plan ��ng Zoliinn or other such
permit issued for nw, construction, replacement, repair, alteration or, extension,.operation
maintenance of a subsurface sewage treatment system. P�YYYra �1� Yr��r� permit issuedx
..
thy; addition -of a bedroom. or bathroom on property. served -by a subsurfauc sewage treatment
systemthe Agency.
(75)(88) .. . ... ... ... ..Permittee. "Permittee" means a person who is named on a permit issued pursuant to these
regulations.
X. 6)(89) .. Plastic limit. "Plastic limit" means --the soil moisture content above which manipulation
will cause compaction or smearing. The plastic limit can be measured by American Society for
Testing and Materials, Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index
of Soils, ASTM D4318 (2005). The standard is incorporated by reference, is available through the
Minitex interlibrary loan system, and is not subject to frequent change.
r'. Pressure distribution. "Pressure distribution" means a network of distribution pipes in
\' ' J
which effluent is forced through orifices under pressure.
1 ? Q'(91) Privy. "Pri " means an aboveground structure with an underground cavity �eetin^ at
c x ..................... ............................... Y y g g Y.........th........
meets. the requirements of Section 18.43 that is used for the storage or treatment and dispersal of
toilet wastes, excluding water for flushing and graywater. A privy also means a nondwelling
structure containing a toilet waste treatment device.
(79)(92) ........... Proprietary product. "Proprietary product" means a sewage treatment or distribution
technology, method, or material subject to a patent or trademark.
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( Public domain technology. "Public domain technology" means a sewage treatment or
distribution technology, method, or material not subject to a patent or trademark.
(41)(94) ........... waters. "Public waters" means any public waters or wetlands defined in Minnesota
Statutes, section 103G.005, subdivision 15, or identified as public waters or wetlands by the
inventory prepared according to Minnesota Statutes, section 103G.201.
(9-0(95) Pump tank. "Pump tank" means a tank or separate compartment following thewithin a
sewage tank, which receives sewage tank effluent that serves as a reservoir for a pump. A separate
tank used as a pump tank is considered a septic system tank under Minnesota Statutes, section
115.55, subdivision 1, paragraph (up).
(96) Qualified employee.
. .....
( 3 9-)(97 .......__ Redoximorphic features. " Redoximorphic features"
(A) a color pattern in soil, formed by oxidation and /or reduction of iron and /or manganese in
saturated soil coupled with theirits removal, translocation, or accrual, which results in the
loss (depletion) or gain (concentration) of mineral compounds compared to the matrix color;
or
(B) a soil matrix color controlled by the presence of ferrous iron. Redoximorphic features are
described in Section 9.6 (5).
(9-4;(98) ................. ................... "Replacement" means the removal or discontinued use of any major portion
of an ISTS and reinstallation of that portion of the system such us reiYstcYlluti; :Y of a �.ev� sev� ago
(99) Rock fragments. in diameter
that are strongly cemented and resistant to rupture. Rock fragments are commonly known as
gravel, stones, cobbles, and boulders..
(9-5)(I 00) ..... ........... SDS permit. "SDS permit" means a State Disposal System permit issued by the MPCA.
('9-6)(101) Sand. "Sand" means a sand soil texture, as described in the F;. Bo�� .P- r.r'�n
S ; �, r ,��;i, , - - -; w hich Soil Survey Manual (1993) developed by the Natural Resource Conservation
�, .Y - ,. YY �.......
Service, United States Department of A ....
co, +;�„ 2 2 Onti�
vwcY.�YY 22 �- �.� is or.. mance.,,
(9-7)(102) _ Seepage bed. "Seepage bed" means a soil treatment and dispersal system the absorption
width of which is greater than three feet but no greater than 25 feet.
(9- ........... pit. "Seepage pit" means an underground pit that receives sewage tank effluent
and from which the liquid seeps into the surrounding soil.
(9-9)(104) _ Septage. "Septage" means solids and liquids removed from an SSTS and includes solids
and liquids from cesspools, seepage pits, other pits, or similar systems or devices that receive
sewage. Septage also includes solids and liquids that are removed from portable, incinerating,
composting, holding, or other types of toilets. Waste from Type III marine sanitation devices, as
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defined in Code of Federal Regulations, title 33, section 159.3, and material that has come into
contact with untreated sewage within the past 12 months is also considered septage.
nn ( 105) .............................Se tic tank. "Se tic tank" means cxx= Wvcxterti" lit c,�vered reecrta- leanvreceptacle that is
Septic P y ., ... .
designed and constructed to receive the discharge of sewage from a building sewer or preceding
tank, stores liquids for a detention period that provides separation of solids from liquid and
digestion of organic matter, and allows the effluent to discharge to a succeeding tank, treatment
device, or soil dispersal area.
Serial distribution. "Serial distribution" means distribution of sewage tank effluent by
gravity flow that progressively loads one section of a soil treatment and dispersal system to a
predetermined level before overflowing to the succeeding section and does not place a dynamic
head on the lower section of the soil treatment and dispersal system. The distribution medium is
allowed to serve as a conveyance medium to the next section.
( °2)(1 ........... "Setback" means a separation distance between two points measured
horizontally.
(93)(108) Sewage. "Sewage" means waste produced by toilets, bathing, laundry, or culinary
operations, and or the floor drains associated with these sources, and includes but is not limited to
household cleaners, medications, and other constituents in sewage restricted to amounts normally
used for domestic purposes.
(94)(109) . ..Sewage flow. "Sewage flow" means flow as determined by measurement of actual water
measurement; or, if actual measurements are not available, by the best available data provided as
determined by the Department
............Sewage tank. "Sewage tank" means a receptacle used in the containment or treatment of
sewage and includes, but is not limited to, septic tanks, aerobic tanks, pump tanks, and holding
tanks. Requirements for sewage tanks are described in Section 13 of this Chapter. Sewage tanks
are considered a septic system in Minnesota Statutes, section 115.5 5, subdivision 1, paragraph (op).
(9)(111) ..... ........... Sewage tank effluent. "Sewage tank effluent" means the liquid that flows from a septic
tank or other treatment device.
(97)(112) Site. "Site" means the area required for the proper location of the soil treatment
systcmSSTS.
(94) 113 ............ lope. "Slope" means the vertical rise -or all,..expresse as_ a. percentage rom a.pomt ..to
a point C divided by the horizontal distance expressed as a percentage from point A to point B
where the line from_point C_to point B is perpendicular to the _line from point A to point B.
(9 ..... ........... Soil dispersal area. "Soil dispersal area" means the area required for the soil dispersal
system, including spacespacng between individual units or zones.
(.100)(115) v Soil dispersal system. "Soil dispersal system" means a system where sewage effluent is
dispersed into the soil for treatment by absorption and filtration and includes, but is not limited to,
trenches, seepage beds, at -grade systems, mound systems and drip dispersal systems.
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(116)
Conservation Service Web Soil Survey available online at httl)://websollsurvey.nrcs.usda.gov/.
( 101)(1 ........... texture. "Soil texture" means the soil particle size classification and particle size
distribution as specified in the Field Book for Describing and Sampling Soils, incorporated by
reference in Section 2.2 (46).
(118) Structure. a constructed lot _mprovement_that is intended or used for human
occupancy or that is determined by the Department to:
(A Interfere with the construction, operation, or maintenance of an SSTS; or,
(B) ........Be interfere d with by the construction, operation, or maintenance of an SSTS
X102`(119
� r....... ) .. ........... Subsoil. "Subsoil" means a soil layer that has a moist color value of 3.5 or greater and has
undergone weathering and soil formation processes.
(103)(120) Subsurface sewage treatment system or SSTS. "Subsurface sewage treatment system"
or "SSTS" is either an individual subsurface sewage treatment system as defined in Section 2.2 (52)
or a midsized subsurface sewage treatment system as defined in Section 2.2 (6270) as applicable.
(104)(121) .. Supply pipe. "Supply pipe" means a nonperforated pipe, the purpose of which is to
transport sewage tank effluent.
(105)(122) ..._._._.Systems in shoreland areas or wellhead protection areas or systems serving food,
beverage, or lodging establishments, or SWF. "Systems in shoreland areas or wellhead
protection areas or systems serving food, beverage, or lodging establishments ", or "SWF ", means
the following three categories or systems:
(A) SSTS constructed in shoreland areas where land adjacent to public waters has been
designated and delineated as shoreland in Chapter Six of the Washington County
Development Code;
(B) SSTS constructed in wellhead protection areas regulated under Minnesota Statute, chapter
103I; and
(C) SSTS serving food, beverage, and lodging establishments that are required to obtain a
licenses under Minnesota Statutes, section 157.16, subdivision 1, and Washington County
Ordinance No. 145 or 146, and includes manufactured home parks and recreational camping
areas licensed according to Minnesota Statutes, chapter 327 and Washington County
Ordinance No. 147.
i 106` 123 TN. "TN" means total nitrogen which is the measure of the com lete nitro en content in
j......... g P g
wastewater, including nitrate (NO nitrite (NOA, ammonia (NH ammonium (NH + ),_and
organic nitrogen, expressed as mg /L.
(107)(124) ........... "TP" means total phosphorus, which is the sum of all forms of phosphorus in effluent,
expressed in mg /L.
(108)(125) Ten -year flood. "Ten -year flood" means the flood which can be expected to occur, on an
average, of once in ten years, or the elevation to which flood waters have a ten percent chance of
rising in any given year.
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(109)(126) Toilet waste. "Toilet waste" means waste commonly disposed of in toilets, including fecal
matter, urine, toilet paper, and water used for flushing.
I
° 127 Toilet waste treatment devices. "Toilet waste treatment devices" means other toilet waste
apparatuses including incinerating, composting, biological, chemical, recirculating, or holding
toilets or portable restrooms.
(a 1 1)(128) Topsoil. "Topsoil' means the natural, in -place organically enriched soil layer with a color
value of less than 3.5 using the Munsell Soil -Color Charts.
rI I2) ........... borrow. Topsoi borrow" means a loamy soil material avmg:
(A) less than five percent material larger than two millimeters, No. 10 sieve;
(B) no material larger than 2.5 centimeters;
(C) a moist color value of less than 3.5 using the Munsell Soil -Color Charts, and,
(D) adequate nutrients and pH to sustain healthy plant growth.
( I3)(130) ... ... ... .Total suspended solids or TSS. "Total suspended solids" or "TSS" means solids that are
in suspension in water and that are removable by laboratory filtering, expressed as mg /L.
? 4;(131) .. Trench. "Trench" means a soil treatment and dispersal system, the absorption width of
which is 36 inches or less.
(IM ...... Type System subsurface sewage treatment system that meets the
rescri jive doi n criteria in Section 17 of this Chapter, and includes trenches ressure beds
p p g ......... I.........v .........
v.
mounds and at grade systems with no pre- treatment ahead of the soil treatment area.
_ _
(133) Type II System. subsurface sewage treatment system that meets the
prescriptive design criteria in Section 18 of this Chapter, and includes systems in a floodplain with
no pre - treatment ahead of the soil treatment area, holding tanks, and privies.
(134) Type III System „ . subsurface sewage treatment that meets the
standards in Section 19 of this Chapter and does not require pre - treatment ahead of the soil
treatment area, and is put on a site with less than ideal soil conditions, such as soil that has been
compacted, cut, filled or otherwise disturbed. Type III systems include Graywater Systems as
described in Section 19.5 of this Cha pter.
(135) Type IV System. subsurface sewage treatment system that meets the
...
standards in Section 20 of this Chapter and re uires re treatment ahead of the soil treatment area
.........p q........ p......... ... ... .,
due to high strength waste from the source or for reduced vertical separation, and uses a pre-
_ _ _
treatment device that is registered _in accordance _with Minnesota Rules, Chapter 7083.4030.
(13 6) Type V System. subsurface sewage treatment system that meets the
_.
standards in Section 21 of this Chapter and requires p re- treatment ahead of the soil treatment area
and uses a re treatment device that is not re g istered in accordance with Minnesota Rules Chapter
p ..................................................................................................................................................... ............................................................................................................................................................................................................. ..............................
7083
(137) Uniform distribution.
over the entire absorption area of a component over both time and space.
(a 15)(138) Valve box. "Valve box" means a watertight structure designed for alternate distribution of
sewage tank effluent to segments of a soil treatment system.
24 Washington County Development Code
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r..a
1-6) 139. .................. ... .. .. Vertical separation. "Vertical separation" means the vertical measurement of unsaturated
soil or sand between the bottom of the distribution medium and the periodically saturated soil level
or bedrock.
1 117`(140
r r....... Watertight. "Watertight" m ans constructed sot at no eliquid can get into or out o a
device except through designed inlets and outlets.
(141) Water Resources
Natural Environment, Recreational Development, or General Development Lake, Transition or
Tnbutary Riyer /Stream or Wild Scenic Rivers
1 114`(142
� r....... ) ,,,,,,,,,,,,,Well capture zone. "Well capture zone" means the surface and subsurface area that
supplies water to a water supply well.
X410;(143) Wellhead protection area. "Wellhead protection area" means the surface and subsurface
area surrounding a well or well field that supplies a public water system, through which
contaminants are likely to move toward and reach the well field as regulated under Minnesota
Rules, Chapter 4720. For the purposes of this chapter, wellhead protection area is that area
bounded by the drinking water supply management area as regulated under Minnesota Rules,
Chapter 4720.
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SECTION 3 ADMINISTRATION
3 .
.1 ...................... Adm n strat v.e scone.
This chapter shall apply and be in effect in all areas in Washington County other than cities and towns that have
adopted ordinances that comply with Minnesota Statute Section 115.55, Minnesota Rules, Chapter 7082, and are as
strict as this Chapter. Pursuant to Chapter One of the Washington County Development Code, the Washington
County Department of Public Health and Environment shall be the Administrator of these regulations. SSTS must
be designed, constructed and operated according to this Cha pter.
2 I C CTC _+ I. ,Ion;, __A ,- ,q +,-.,,. +—A --A ., +—A _____A_ +l +„ rl,.,, +o,- ,-.+ ., ,,A -9—A +l„-,,,,,.1, .,
�o
"""' IYC' J�' Y' i3" Y' YY` 1. isi r rtY V �I. iV': iY' �' YY�v�CYj iiliY' Y: iY: Y' ikY% Y: �lY" iiYtll' l�' liit' li. Lli: Y' iiii' C% i' lY' �YYYi� ri '1 "l.Y'Yi:7 ""I.iYYiYY
I...cara.sa.1 .
....rar.rl.a. aria.n.ce.�a....a. as ....nnaxa.».a.a... . ...�.a.... aza, k. �,.... �. Lla, arx�, �. a. sz. raksa ....�.- 3 .�.........�.�.�saaraak gar....:. �.(w,. �. �....... n.. lbsxt, aa. �x�n.+. �a..... �': k ka. a.: k�x. sz....... �. �a. �.: ka. naa. ....�,...a...a'....1'...a
.vvw. v.u...w..vv ... vv.aaN..w..vv vv.�.. i.a.....v.av�w
and th;i�.... Cha — r...
wa.0 this w..
3.2. ........................Qu alifications.
SSTS, including both ISTS and MSTS, must be designed, installed, inspected, parnY 1I, se`. Vic dmamta.ned,
repaired, and operated by licensed businesses and certified individuals meeting the qualifications in Minnesota
Rules 7083.0700 to 7083.2040 M.d' -My- other. SSTS must conform to all applicable state orlaws and rules and local
requirements.
3.3 Federal. regulations.
SSTS that are designed to receive sewage or nonsewage from a two family dwelling or greater or receive sewage or
nonsewage from another establishment that serves more than 20 persons per day, are regulated by the United States
Environmental Protection Agency as Class V injection wells under Code of Federal Regulations, title 40, parts 144
and 146. Code of Federal Regulations, title 40, parts 144 and 146, prescribe additional design regulations
applicable to certain systems designed under this Chapter. In addition, single family dwellings that receive
nonsewage wastewater are regulated by these federal regulations. All systems that receive hazardous wastes are
regulated by the Unites States Environmental Protection Agency as Class IV injection wells. Disposal of hazardous
waste must be according to state and federal regulations. The owner or owner's agent of a new or replacement
system classified as a Class V injection wells shall submit to the commissioner of the MPCA and the United States
Environmental Protection Agency the inventory information specified in Code of Federal Regulations, title 40,
section 144.26. n 11 C1... AT ; ,;o +; , , 11q a,, + I o ; ao +;moo a � h or,,. +r. 4a r .I;� 1. �„
L YYY CiY Uo "Y " "'YYY�VY�Y:Y lJ�YY V'V eYY.'i'' Y Y YUJG' "Y YiYiiYYi;YlYViY "il:.'i' ".7uv..' "lYY F.VF' .Cy GYUYYJYV Y' "\;YY.7arYlJ�':YUYr✓':Y'.
3.3 Variance procedures.
If the Department finds that by reason of exceptional circumstances, the strict enforcement of any provisions of this
Chapter would cause undue hardship or that strict conformity with the standards would be unreasonable,
impractical, or not feasible under the circumstances, the Department may permit modifications in individual cases
based on conditions it may prescribe for prevention, control or abatement of pollution. The Department or- local
aunit of g ov erf r imert cannot issue variances for Sections 4.1, 4.7, 4.8, 4.9, 4.10 and Sections 16.2 (1) through Section
16.2 (4). The Department or local unit of go V a nt can grant a variance for Section 4.98 (4) (A) for replacement
MSTS serving existing dwellings or other establishments..
3.4 Board of adjustment and appeals.
......... ..........
Consistent with the procedures In Chapter One of the Washington County Development Co. de Section 6.1 (1), the
Washington County Board of Adjustment and Appeals shall hear and decide appeals of any order, decision or
determination made by the depart .Department regarding the enforcement of this Chapter. Appeals of any
administrative decision or determination may be filed by any person, county department, or township. All requests
for a variance to re u>rements of this Chapter shall follow the rocedure In Chapter One of the Washm pr Count
q ......... .p...... p..... ......... p ....... y
Development Code.
26 Washington County Development Code
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Four a Subsurface Sewage Treatment System Regulations
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3 5 Adherence to these standards
.......
All subsurface sewage treatment systems installed subsequent to the adoption of this Chapter and all alterations,
extensions, modifications or repairs to existing systems irrespective of the date of original installation shall be
regulated in accordance with all requirements of this Chapter.
3.6 _qualifications.
All MSTS must be designed and operated according to this Chapter. All MSTS must be designed, installed,
inspected, pumped and operated by a qualified employee_in accordance with the requirements in Minnesota Rules
Chapter 7083, or a licensed businesses meeting the qualifications of Minnesota Rules, Chapter 7083. All MSTS
must conform to applicable state statutes and rules. All septuge generated £ o : MSTS a:ust be treated and
a ;nrP C'-,A- _f17Pa... I uPnAA�� +; ,n + ; +IP nn r t ;OQ .,,,a 11 1—]
Msfj✓ljtU LO C1.f1P11NLI.VYG "'.9LitiYYRACl US 1\JY " "Sl Pv 5t YYY +C Mt 01 "r✓r.f ClY' "TW5"IUWIIJ "L1M °9"iT� "fjUv J<T; MC1''L1.YY}' "IOM
r +n
rV �Lilrvlll\IllLS:
aischarg J 3 7 Collection Systems.
YYl. 1 ♦VY 1.111JLYYY J JLI.YYY ♦�YYYI.YY UYJ�.YYp l.
Collection of greater than 2,500 gallons per day of sewage from multiple buildings or multiple other establishments
dischar into an I SSTS must be:
(1) Designed according to su ace vyatersPrescri Desi and Desi Guidance for Advanced
........
o
Desi tiers mco orate re erence un er ection 5 4 or tYliYVrL1YLi JikY l(ii l
(2) Designed by _a Minnesota licensed_ professional_ engineer.
.
3.8 MSTS septne
All se ptage g enerated from MSTS must be treated and dispersed to a standards for se ptag e as set forth in
Code of Federal Regulations 40 part 5 and any requirements.
3.9 SDS permit required.
(1) The owner or owners of a single SSTS, or a group of SSTS under common ownership must obtain
either ail NDDBS or an SDS permit from the MPCA and shall
i 11 l.rl...v vl vl.>v
r�wwremeats agency according to_Minnesota Rules, Chapter 7001 when all or part _of the proposed
or existmg soil dispersal components are withi... nelf me
g each other and the combined flow
from all proposed and existing SSTS is greater than ,00 gallons per day. For proposed_SSTS,
the flow must be determined according to Section. 3.9(3). For existing SSTS, the flow is
determined by the greater of
(A) The average maximum seven -day measured flow; or
(B) ........ flow determined according to. Section 3.90).
(2) An SDS permit ... is required for any subsurface sewage treatment system or group of subsurface
sewage treatment systems that the _commissioner determines has the potential or an _increased
potential to cause adverse public health or environmental impacts if not regulated under a state
permit. Conditions for these permits include systems in environmentally sensitive areas,
unsubstantiated or unexp ected flow volumes v p . p
and stems re uinn excep tional operation,
...................................................................................................................... .............................. .........9..................... g........................ ..................................... ..............................
monitoring,... and management.
(3) Flow amounts to calculate whether an SDS permit is required must be determined according to
_ ..
Section 12.4 to 12.10. The highest calculated value of the various methods in Table II of Section
12 must be used to make this determination. An SDS permit is not required if a factor of safety is
added to the design flow that results in a design flow that is in excess of the SDS hermit threshold.
27 Washington County Development Code
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a Four Subsurface Sewage Treatment System Regulations
3.10 Other state regulations.
............................................................................
MSTS must conform to all applicable state statutes and rules. MSTS serving establishments licensed or regulated
by the State of Minnesota, or MSTS owned by the State of Minnesota, must conform to this Chapter.
3.11 Local regulations.
. ... ... ... ... ... ... ... ... ... ... ... ... ...
Any SSTS requiring approval from the State of Minnesota sha-Ilmust also co m- ply-withmeet all requirements ofset
forth in this Chapter, and in all other local codes and ordinances.
... ... . ... ... ... ... ... ...
3.12 Work done without._permit.
..................................
Where work requiring a permit under this Chapter has commenced without first having obtained such permit, work
shall be ordered to stop by the Department until all required permits have been approved and issued.
3...1.3 .......... A.p.t.h.p.r.i.z.ed..a.cc.e.s.s...
To enforce this Chapter, the Department or its authorized agent may enter aa building, or come on to property, or
aplace where there is reason to suspect that a subsurface spg is fail* groundwater
..........................ew
......... c . tTpqtmpqt . system 1 failing to protect g
or an imminent threat to public health and safety.
3.14 Permit fees.
Fees for permits, operating permits, inspections required, or other services rendered under this Chapter shall be
.............. . .......................
— 1 he
- Mo ed'set, by the Washington County Board of Commissioners.
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SECTION 4 COMPLIANCE CRITERIA
4,1 ......... Treatment required.
Sewage discharged from a dwelling, _group_of dwellings, or other establishment that is not served by a system issued
aan operating permit containing effluent and discharge limits or specific monitoring requirements by she
Department or Agency must be treated according to applicable requirements.
4 .......................... Compliance criteria for new construction.
An SSTS regulated under a current permit is considered compliant if it meets the applicable requirements of Section
16 to Section 21.
4.3 ......... Compliance criteria for existing systems.
To be in compliance, an existing SSTS must meet the provisions of this subpart.
(1) The SSTS must be protective of public health and safety. A system that is not protective is
considered an imminent threat to public health or safety. At a minimum, a system that is an
imminent threat to public health or safety is a cesspool se.epagc pit .drgwell or leaching pit, a
s . y A te:n` *hdir ^l:argeo fsystem which discharges. sewage or sewage effluent to the ground surface,
drainage systems, ditches, or storm water drains or directly to surface water; systems that cause a
reoccurring sewage backup into a dwelling or other establishment; systems withwhich pose
electrical hazards; orsystems which have sewage tanks withthat are unsecured, damaged, or with
weak maintenance hole covers. A determination of protectiveness for other conditions must be
made by a qualified employee of the Department or licensed inspection business.
(2) The SSTS must be protective of groundwater. A system that is not protective is considered a
system failing to protect groundwater. At a minimum, a system that is failing to protect
groundwater is a system that is aseepage- pit, cesspool d: leachitYg pit, or other pit;,.; a system
with less than the required vertical separation distance described in Section 4.3 (4) and Section 4.3
(5) of this Section; and a system not abandoned in accordance with Section 2324. A determination
of the threat to groundwater quality for this and other conditions must be made by a qualified
employee of the Department or local u wit ofg-mvernment or licensed inspection business.
(3) The SSTS must be operated meet performance standards, and be managed and operated
to its operating permit.
(4) SSTS built after March 31, 1996, or in an SWF area as defined in Section 2.2 (109122), shall have
a three (3) foot vertical separation. No more than a fifteen (15) percent reduction in the vertical
separation distance is allowed to account for settling of sand or soil, normal variation of
measurements, and interpretations of the limiting layer conditions.
(5) SSTS built before April 1, 1996, in areas that are not SWF areas as defined in Section 2.2 (.1-flo_122),
must have at least two (2) feet of vertical separation.
(6) The vertical separation measurement for Section 4.3 (4) and Section 4.3 (5) shall be measured
outside of the area of system influence in an area of similar soil and on the same contour elevation.
(7) An existing systen:SSTS which is found to be an imminent threat to public health and safety by
eith; r a qualified employees of the Department, . unit of government, or a licensed inspection
business, is hereby declared to be a public health nuisance and shall be abated within ten (10) days
from the date the Owner s notice The system shall be repaired, upgraded, replaced or its use
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I
discontinued within th'i'rt'y "'('3'0; "'day='s "o-fninety (90) days_from the date_the Department gives the
Owner notice and order to comply by the Department. Any further discharge of effluent must be
stopped mmodiatcly prevented within ten (10) days (by such methods as reducing or stopping all
water use or pumping the tank as necessary) until such time as the system is corrected.
(8) Any existing system which is found to be failing to protect groundwater shall be replaced or
otherwise brought into compliance within x:t (90)'dw'y�twe_lve (12) months of notice and order
to comply by the Department.
(9) An existing system that is not otherwise considered an imminent threat to public health and safety
- -A . , 11 . rq +...,,. +-A , A__ , ;+ ; A i.., +1 n-- -- or+ -+1,-- 11 , 4 „P
Y'iYYli "'Y YY'YYY%Y'Y "i'V' iii" til} Y' Y: i' YtY' ikY% Y; ail',i"i,LYil',iii'i "i:'�l[i'Y
..x.r ..... ....x.x�..cx�a... a�. a�. .xxxx�a.... xa....�.a...� �..x. .a. ...��ra.� +��....�f +.h
...... a.i��... �.�..instµllµti�n.... n
�. �....� �..µ� �...�.. ...��... �.. �., µ. �. N µ.µ..... ,.��. µ� �...... ee
not be upgraded, repaired, replaced, or its use discontinued notwithstanding the fact that at the time
of a compliance inspection, there appears to be less than the required vertical separation between
the system bottom and any limiting layer. if all of the following can be verified in the historical
permit record
(A) Complete soil testing, including soil borings and percolation tests were conducted at the
time of the design and installation
(B) The I soil observations are consistent with the I Soil Survey;
(C) The County verified that three feet of vertical separation existed at the time of installation by
conducting. verification soil,. observations. and notes indicating. such verification are.present
in the _permit record;
(D)
verification soil observation were conducted and approved; and
(E) The system was installed at the maximum depth allowed by the permit.
4.4 Compliance criteria for systems with a flow of greater than 2,500 gallons per day.
In addition to the requirements under Section 4.3, systems designed under Section 16.4 must demonstrate that the
additional nutrient reduction component required under thoose itcrosthat section is in place and functioning.
45 ........ Compliance criteria for systems receiving replacement components.
Components of an existing system that result in the system being in noncompliance must be repaired or replaced
according to this Chapter. The repaired or re'pl'ace'me'ntreplaced components must meet the technical standards and
criteria of this Chapter. The remaining components of the existing system must result in the system being in
compliance with Section 4.3. If µ compliantan existing sewage tank is to be used with the design of the new soil
dispersal system, the tank must also be baffled and be, watertight, and the manhole cover brought to grade.
�ctio4 6 MSTS General.
....
Newly constructed, replacement, or existing MSTS designed under this Chapter are considered conforming if they
meet the requirements of this Chapter. Existing MSTS constructed before the effective date of this Chapter are
considered conforming if they meet the requirements of this Section, except for Section 4.98 (4) and Section 4.98
(
4.7 Public health and safety; imminent threat.
...............
(1) To be in compliance, all MSTS must:
(A) have treatment processes and devices that do not allow sewage or sewage effluent contact
with humans, insects, or vermin;
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(B) disperse sewage effluent into -YLr soil or sand below final grade, with the effluent remaining
below final grade;
(C) not discharge to drainage tile, the ground surface, or surface water or back up sewage into
dwellings or other establishments;
(D) treat and disperse sewage effluent in a safe manner, including protection from physical
injury and harm; and
(E) not have received hazardous material.
(2) MSTS must be considered an imminent threat to public health and safety for noncompliance with
Section 4.7 (1) and any other condition that poses an imminent threat as determined by a qualified
employee of the Department or licensed n 1�THadvanced inspection business.
4.8 Groundwater protection.
........ ......... ........ ......... ......... .......
To be in compliance, all MSTS must:
Ll —;– +I;„ n ��,o �f inn +,, +–A �� 1 1— +. --- +ho h –++-- –f +ho ��;1 + +,,o �+ —A A;�,�o,- nnl_�� +o,,
Y� YYYU.iYYLCYYli Li Y:\1Yii llY JLLLUYULVU SVYY VVLVV VGII L11V "V VLLVLYY "VY LYYV "JVYY LYV LLi 11VYYl;' "LLYYU lYY3VY.9 U.Y "' JLVYYY
M I –A +ho n„�,,.n11– nn +,,, -n +–A nn„1 n„- I—A - n,,.1L ,�,,, -;— 1„n,�.r �o��l „or+ n ,�on,.v I—A 1 ” Co,. +. r
n vi n
I:LYY'U" I;YY v' �} V'i'iv};1[YY%tY:iYy" "3iil:U'Y iY.i'1v U' :iYY'Y Y "'lY" Y}ii'U'YV}Y;iiY "UUY'iY'i5 "YilCLUYYY& "illC" V'Y'Y'i Y;iJ'YY'L� 'CL'.Y';1[i'.Y�i,iY Y iJ V U "YY'Y "lJ VY;i i,'YilYY
1.6..5...(9)..
(1) meet the requirements of Section 4.3 (4)
(3)(2) not be seepage pits, cesspools, drywells, leaching pits, sewage tanks, and treatment vessels that
observably leak below the designated operating depth;
(4)(3) not allow viable fecal organisms to contaminate underground waters or zones of seasonal
saturation;
(5)(4) employ nitrogen reduction processes that reduce nitrogen contribution to groundwater as
determined: subitems and
(A) if the discharge from an MSTS will impact water quality of an aquifer, as defined in
Minnesota Rules, Chapter 4725.0100, subpart 21, the effluent from an MSTS, in
combination with the effective recharge to the groundwater, must not exceed a concentration
of total nitrogen of 10 mg /L or greater at the property boundary or nearest receptor, which is
closest; ,rand
(B) if the discharge from an MSTS will not impact water quality of an aquifer, as defined in
Minnesota Rules, Chapter 4725.0100, subpart 21, best management practices developed by
the Commissioner to mitigate water quality impacts to groundwater must be employed; and
( )(5 not exceed a groundwater discharge of phosphorus to a surface water that exceeds the phosphorus
standard to the receiving water.
4.9 . Other conformance..
To be in compliance, all MSTS must meet the following requirements:
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Four a Subsurface Sewage Treatment System Regulations
(1) All methods and devices used to treat and disperse sewage must be designed to conform to all
applicable federal, state and local regulations.
(2) Systems no longer in use must be abandoned according to Section 2.324.
4.10 System operation.
............................. ................................
To be in compliance, MSTS must meet performance standards and be operated and managed according to its
operating permit and management plan, as described in Section 22.1. To be in compliance, an MSTS designed
before the of eCtive date ofth s 200 must be operated according to applicable requirements in
Section 22.
4.11 Compliance criteria for systems receiving replacement components
Components of existing MSTS that cause non - compliance must be repaired or replaced. The repaired or replaced
components must meet technical standards and criteria of this Chapter. The remaining components must comply
with Section 4.1 to Section 4.10 including .Section 4 9 (4) constructed after the effective.... date of thi
Ch-pe t February 4, 2008.
4 ....Upgrade requirements.
(1) MSTS in compliance with this Chapter shall be issued a certificate of compliance. MSTS found
not in compliance with this Chapter shall be issued a notice of noncompliance.
(2) MSTS issued a notice of noncompliance based on the criteria in Sections 4.7 48. shall be
repaired oreor replaced Within 30 days in accordance with Section 4.3 (7) of this Chapter or as
...
directed by Minnesota Statutes, Chapter 145A, whichever is more restrictive.
(3) MSTS issued a notice of noncompliance based on criteria in Section 4.98 or Section 4.109 shall be
repaired or replaced according toin accordance with Section 4.3 (8) of this chapter.
(4) Systems issued a notice of non - compliance based on criteria in Section 4.1110 must immediately be
Y�.ai�Ytai:ed, tt„�.it: red, ; r Yt.aYtaged according toput into compliance _with the operating permit.
32 Washington County Development Code
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SECTION 5 ACCEPTABLE AND PROHIBITED DISCHARGES
5,1 ..... Sewage
This Chapter provides design standards for SSTS that receive sewage. If an SSTS receives both sewage and
nonsewage, the requirements of this chapter and requirements governing the nonsewage portion of the water apply.
5.2 System influent.
5. Footing or roof drainage and chemically treated hot tub and pool water must not be discharged
into any part of the SystemY
.5 . ... . .. ... .. Hazardous waste must not be discharged to a s �tem
SST$. Products containing hazardous chemicals must not be discharged to an SSTS other than in
normal amounts of household designed for household use. Substances not
intended for use in household cleaning, including but not limited to, solvents, pesticides,
flammables, photo finishing chemicals, paint, and dry- cleaning chemicals must not be discharged
to the systemSSTS,. Other unused products or substances, or unused medicines, must not be
discharged to the y YStem olelySSTS as a method of disposal method:
(1) Floor drains from garages serving dwellings, vehicle maintenance businesses, or any other floor
drain that haswould have the potential to introduce hazardous waste into the systemSSTS, must not
be connected to the syStemSSTS.
(2) ....... I STS must be . designed to provide additional treatment
(A)
................ Raw sewage _exceeds 300 mg BOD, 200 mg /L TSS,_or 50 mg /L oil and grease; or
(B) Sewage tank effluent applied to the soil from the sewage tank or other secondary treatment
device is greater than the concentrations in Section 12.11._
(3 Additional treatment must be desi by a Minnesota licensed professional en or accordin
to the recommendations in the Prescriptive Designs and Design Guidance for Advanced Desi gners,
which is incorporated by reference or must use a roduct registered under Minnesota Rules,
...... u ........ ......... ......... p ...g........ . ... .......v
Chapter 7083.
(4) Prescriptive Designs and Design Guidance for Advanced Designers, Minnesota Pollution Control
Agency (October 2013 and as subsequently amended), is made a part of this ordinance by
reference, is subject to frequent change, and is available at
www state mn us /programs /ists /technical html.
5.3 Domestic waste.
Only domestic strength waste shall be discharged to a soil dispersal and treatment area. Sewage tank effluent with a
waste strength higher than domestic waste shall be pre- treated to a level equal to or less than domestic waste prior to
final treatment and disposal in a soil treatment and dispersal area.
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SECTION 6 PERMITS
6,1 ..... Buildin Permit re
No construction shall be allowed by any local unit of government until the permit required for the subsurface
sewage treatment system has been issued.
6.2 Compliant system or permit issued.
No additions, enlargements, improvements, or remodeling involving fifty (50) percent or more of the structure, or
alterations that would affect the water use, such as bedrooms, bathrooms or additions to living space (excluding
such areas as screen porches, entry ways, decks, attics, patios, nonhabitable storage space) shall be allowed until the
subsurface sewage treatment system has been determined to be both adequate and conforming or a permit for a new
treatment system has first been issued.
6.3 Permit required.
Permits shall be required for subsurface sewage treatment systems as 011 the following instances:
(1) All new installations of sewage tanks, soil dispersal and treatment areas, and components thereof,
(2) All repair, extension, replacement or modification of existing systems and components; or
(3) Any change in use of a facility served by a subsurface sewage treatment system.
: 1 ........................P shall not be required for normal routine inspection and maintenance cif approved individual
� v�
v�uuv F....�.x #...
ouvouawvv ov vv w�v �.vw�urvu� oy owu.o �uw� uv uv� . wu v. w�u. �vuu.�.
6.4 ....................... application.
Permit applications shall be made in writing on forms provided by the Department and shall contain data, including,
but not limited to, to be considered a completed permit application:
(1) Correct legal description of the property, including Property Identification Number or GEO Code;
(2) Site plan, drawn to scale, showing the location of all proposed and existing structures, property
lines, water supply wells within 100 feet, terrain features, such as blufflines, water bodies or water
ways, buried utilities, easements, and other unique features of the site;
(3) Soil test date, including soil boring logs, percolation test data with field notes (where required) and
location and identification of test area.
(4) Plans and details of the proposed installation of work, including engineering data and final design.
(5) Building plans showing existing and proposed room arrangement and uses.
(6) For other than dwellings, calculated or measured water use rates, occupancy and occupant load.
(7) In certain cases, a property survey may be required identifying property characteristics and
including such items as elevations, contour lines, normal high water marks, and ten (10) year and
one hundred (100) year flood elevations.
(8) Evidence of compliance with state or other jurisdiction regulations where applicable.
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(9) (9) ........................A management plan for the proposed system, as described in Section 22.1.
(10) A site gradin plan.
6.5 Site plan required.
.. ... ,...
No permit will be issued until a detailed system design is submitted for the current proposed construction, including
site plan, a management plan and at 1-1--St. Mn current soil boom ng ifobservations. If previous soil observations have
been conducted and meet this Chapter, and there is no reason to believe the soil conditions have bee ultred since
the original soil testingchanged, those soil observations may be used, in lieu of current soil observations, for the
design of the proposed
6.6 Permit time limit.
Permits shall be valid upon issuance and shall continue for a period of one (1) year. After one (1) year, the permit
may be renewed if no changes are proposed. Such renewal shall require reapplication and payment of the
established fee.
6.7 Permit revocation.
Permits issued under this Chapter may be revoked upon written notice by the department when such permit has
been issued based on erroneous or inaccurate data supplied by the applicant or erroneous interpretation of the law
by a building official.
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SECTION 7 OPERATING PERMITS
7 ..... Operating
Operating permits are required for the following systems:
(1) ........Type III -Systems
(1) Type IV Systems
(2) Type V Systems
(3) All MSTS
u
�_l - - Y_Vx 6 cw -o uvuvYxvvu vvvcYVYY Yoe - ✓'
(4) Food, Beverage and Lodging Establishments that discharge high - strength waste to the soil
treatment area.
......_u�x a�xxct.nxxc _Sh,Ia ctn A...a.Px'x Px'�YtnYC xxratti.._ciit�cxxY -f�Yrn cPxar�YrtP._txP �xtm Pn:k cxrc +Pms�....
X31 ��u. al—o vv wow vv..v.w vv 11 ouwu.�wvv ovvvw�v LI- 11w11L o
7.2 Operating permits issued.
......... ........ ......... ...::::::
Operating permits will be issued by the Department "'car"' the "local "'un'i't "'c �f'gove'rrime'nt.
7.3 Operating permit criteria.
........
Operating permits ustmay include:
(1) Maintenance requirements, including frequency of maintenance -;
(2) Operational requirements.;
(3) Monitoring requirements,
�?)(4) ..... Compliance limits and comphance
(4)(5) . _Reporting frequency:_
(5)(6) _A requirement that the permittee notify the Department or local unit of gove =rnment when permit
requirements are not met. Corrective actions must be taken as directed by the Department of local
tXY'Y'Y I[;''Y'Y "�i1 Y'�Y'YYYYY'VYY'G:`,
(6 )(7) W Disclosure of the location and condition of the additional soil treatment and dispersal system; and
(7)(8) A stipulation of acceptable and prohibited discharges.
9 An other re uirement determined b the Department to be necessa to ensure that ublic health
......) ....................................... y....................................... q........................................................................................................ y................................. p................................................................... ............................... y................................................................... p........................ ...............................
and the environment. are.. being.. adequately...protected...
7.4 Operating Permits
.....................................................
........ .................
SSTS for which an operating permit has been issued, must be operated in accordance with the operating permit..
7.5 MSTS Maintenance
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MSTS and other establishments must be maintained this Section 22.
7.6 .... Grease
All ext ......
xternal ,grease interceptors must be routinely inspected to determine the volume of,grease present. All external
grease interceptors must be properly maintained to prevent cloggin of downstream piping and system components.
7.7 Operation and Maintenance Manual.
For all MSTS constructed after the effective date of this Chapter the designer must complete an operation and
maintenance manual and the manual must be submitted to the Department or the local unit of government before
system operation. The manual shall include a copy of the plans and specifications, as -built drawings of the system,
and information to properly operate the system..
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7.8 Groundwater Monitoring..
All groundwater shall be monitored in accordance with Section 11.
7. 9 ....................... pliance .
Any o erational noncompliance must be immediate) corrected and re orted b the owner or service rovder to the
... .........
o... 1� ......... ......... Y ........ ....1 .. .........Y ......... provider
....................
Department.
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SECTION 8 INSPECTIONS
8.1 ......................... Reou red.. nsipect ons.
Inspections as regdired to determine compliance with this Chapter shall be performed by the Department or its
authorized agent uncle in the following circumstances:
(1) Site inspections to verify and evaluate soil and site conditions and to determine the suitability of
soils and system design prior to permit issuance.
(2) Nv cc s san xnw'v st. " onhivestlgations to determine compliance of existing systems at the time of
remodeling, ofalteration, or of additions to a dwelling.
(3) For all new SSTS construction or replacement.
(4) Mound systems require a minimum of three construction inspections:
(A) When the original soil under the mound has been roughened, but prior to placement of the
sand fill. Enough of the proposed sand fill must be present to be viewed.
(B) After placement of rock and piping, but prior to cover.
(C) When the mound is completed.
8.2 Time of inspections.
Installation inspections shall be made by the Department prior to any work hwv=ing beenbeing covered by backfill.
8.3 Inspection scheduling.
....:::: .......:: .....:::: ....:::: ..:::.........
The licensed installation business shall be notify the Department a minimum of twenty -four (24)
hours prior to the time work is ready for inspection or reinspection.
8.4 Work backfilled before inspection.
Work which is backfilled prior to a required inspection may be ordered to be uncovered whenever the Department
deems it_necessary to determine compliance.
8.5 Correction orders.
If upon inspection any part of the system is determined not to be in compliance with this Chapter, written notice
shall be provided by the Department indicating the deficiency and the required corrections. Noted deficiencies shall
be properly corrected and reinspected before any other work on the project is continued.
8.6 Svstem placed into service
No system shall be placed or replaced or placed in service until a final inspection has been completed and the
system installation has been approved.
8.7 Department access.
The owner or occupant of a property shall be res—o— - t provide access at a reasonable time to the Department
or its authorized agent for the purpose of performing inspections required under this Chapter.
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8.8 As- builts.
The Contractor, upon completion of installation, shall file with the Department as -built drawings indicating the
location of system components dimensioned from a permanent reference point.
8.9 Disclosure.
...............
If an inspection is conducted as a part of preparation of the disclosure required by Minnesota Statutes 115.55, subd.
6 and such inspection is conducted by a party who is not the property owner, such party must be licensed in
accordance with MPCA rules and regulations and the notice of compliance or noncompliance provided to the
property owner must also be provided to Washington County within thirty (30) days of the inspection.
8.10 ........ Compliance flap;,-,*,:, -i inspection, new construction or replacement.
(1) A compliance inspection for all new construction or replacement must be conducted:
(A) to ensure compliance with applicable requirements;
(B) prior W the trulYS "r 0f ufly I al property unless the age of the system is less than 5 years.,
prior to the transfer of any real property;
(C) to ensure compliance before issuance of a permit for the addition of a bedroom on property
served by an SSTS;
"' """'
(D) by a qualified employee or licensed inspection business, authorized by the Department or
local unit of government, who is independent of the owner and the installer; and
(E) for an evaluation, investigation, inspection, recommendation, or other process used to
prepare a disclosure if conducted by a party who is not the system owner. The disclosure
action constitutes a compliance inspection and must be conducted according to Minnesota
Rules, Chapter 7082;
(2) (F) ...... .......... when deemed necessary by the Department to ascertain the compliance of an
existing _system.
A licensed inspection business that inspects an existing SSTS is allowed to subsequently design
and install a new SSTS for that property, provided the inspection business is also licensed
to design and install.
(2) A licensed inspection business working on behalf of the Department or local unit of government
must not design or install a system if there is likelihood that the inspector or business will be
responsible for permitting or inspecting the system or system site.
(3 An licensed SSTS business ma ins pect an existin s ystem which thev installed once it has been
independently inspected and found to be compl
(2)(4) person working for or on behalf of the Department or local unit of government is not allowed to
use the person's position to solicit business for private bu -sx::es's gain.
8 . 1 A,, .,,,, ,op.- tPu , licensed CCTC hun ;nPen ,Y,��, ;,,�„P + ,,, Pv; r;-- � +P �x,l,; 1, +1,P�, ;,, t 11Pd <,,, - ;+ b— I-"
o f r - iii uNNxvNiiucv y iivv uvu vv vuu iivou rriuy iiiuFv wr vzuociii6 oYo 111 vviiiv i uivy - i iucuiivu viivv - rc iiuu 11
xxiuv �uYYUUix �xy - rxi.s� uv cv u
8,11 Certificate of compliance; notice of noncompliance.
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(1) SSTS in compliance with applicable requirements must be issued a certificate of compliance and
systems found not in compliance must be issued a notice of noncompliance. SSTS not in
compliance with Section 4.3 (1) or Section 4.7 must be repaired or replaced within 3090 days from
notice by the_Department or as directed under Minnesota Statutes, chapter 145A. Systems out of
compliance with other applicable requirements must be repaired or replaced according to local
or- dinancc requi.remcnts :this_Chapter or other local ordinances as strict as this Chapter. Systems
issued a notice of noncompliance for operational or monitoring deficiencies must immediately be
maintained, monitored, or managed according to the operating permit.
(2) The initial certificate of compliance must be issued if reasonable assurance is evident that the
system was built according to applicable requirements as specified in the construction permit and
an as -built as...required by Section 8.8 is submitted to the Department.
(3) A Management Plan, as described in Section 22. 1, must accompany a compliance inspection report
in order for a Certificate of Compliance to be issued b the Department or local unit of g overnment.
The certificate of compliance for new construction and replacement must include the vertical
separation distance report described in Section 8.14-(2)(13(3)13), and the management plan
developed under Section 22.1. All certificates of compliance and notices of noncompliance for new
construction and replacement must include property and property owner identification, date of
inspection, system components, system location (dimensioned or drawn to scale), well setback
distance, field check of soil conditions, SWF, as defined under part Section 2.2 (109122),
designations as applicable, and Class V designation as applicable.
(4)(5) A certificate of compliance or notice of noncompliance for new construction or replacement must
be signed by a qualified employee certified as an inspector who is authorized by the Department or
local unit of government. The certificate of compliance or notice of noncompliance for new
construction and replacement must be submitted to the owner or owner's agent within 15 days... The
certificate of com liance or notice of noncom liance for new construction and re lacement must be
p........ p........ p....... ...............
(5)(6) A certificate of compliance or notice of noncompliance must include a certified statement from the
qualified employee who conducted the compliance inspection and indicate whether the SSTS is in
compliance with this Chapter.
(6)(7) _If a compliance inspection for new construction_ or replacement indicates that the system is not in
compliance with applicable requirements, the notice must contain a statement to this effect and
specify the reason for noncom
(' )($) _._._Certificates of compliance for new construction or a replacement system remain valid for five years
from the date of issuance unless the Department or local unit of government finds evidence of
noncompliance.
8 ^lianc 12 Com ins ections existing systems.
'l: :Y i.iYYi�[LLi. iiY il1YYY1,lYYLYYYi , i.' YY a/LY'�.i. iiY'YYtYYYi,V YYY 1,IYYUYY'GC. N.. I
(1) ........................A.. complice ..inspection..of.an..existing.. system...must..be...conducted.
(A) Prior to the transfer of any real property, unless the age of the existing system is less than 5
years;
(B) When deemed necessary by the Department to ascertain the compliance of an existing
s ystem.
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(2) _A compliance inspection of an existing system must first determine whether_the soil dispersal
system, sewage tanks, or conditions pose an imminent threat to public health and safety. A
determination must then be made as to whether the sewage tanks and soil dispersal area are failin
s ting u
to protect groundwater. The agency's l 4 111 JLYYY C L1 1 STC y inspection must also verify compliance with
Section 4 3
(3) inspection report form's "shall' be "'form for existing SSTS supplemented with any
necessary or, locally_required supporting documentation, must_be used for the existing system
compliance inspections in subitems (A) to (D). Allowable supporting documentation includes tank
integrit assessments made within the p ast three years and prior soil separation assessments
11\ A„ ; o„ +;,,, -, � +;, -,,. ceTC _+ . ,-;f., +],----A „; +;,,, ; „l.; +o,�.� 1 A +-I Pk
VxY " " " "' 'YYY "YY'Y: pV'C%L'YVYY "YVi "V[ Y'.Y L'YY'Y " LnJ V e'i'Yi� - VII i''l%VYYYk'Y L'Y lYY'.Y'YIY ":i'UiYYY:VYYY Y" X[Y 'C,V' °k'Cij"
(A) C, vv'a ^4 1 W + 114 n C4E CPA �nY 14n� 1 t4 1P! T,1I +AP nA?4Y7 + }X} 4 yPY +A ..
�. LLLIII�� 11n-O' w LL . ..� �. 1 1.,LL1 "5' ,,"-vv "" .� -'FL"- � 1. LL1,LL�. "F-"
h4 rnm, ,�4 +4 a +I,P Y„4 +1,n'4 or 1,P +�,nA"' +n ,,Harp +� 4 n � ,, ,+ The A tank
VV , VI1 p, LVU LIILLL 111V1UU _ 111VU1VU Vl 111VL Gas _ GV 11.-1 -.1 LLJJVJJ111e11L.
integrity and safety_ compliance assessment must be --A completed by either a licensed
SSTS inspection, maintenance installation or. servlce business, except a desigYl
bus'i'ness, or a qualified employee w'ith.'an...SST.S.oert .i'fu'at .ion exce'pt.as ..a'designer: A.-passing
v "inspector with jurisdiction. An existing compliant tank integrity and safety
compliance assessment is valid for three years unless the
eve e tlhat a nv vJ ilis of is to be Cori bu +ed and the tallii is wund not to be vvatertighia
new evaluation is requested by the owner or
or local unit of government
(A) ... ... ... ... The "'vertical. A soil separation d'i' stance. "from'. the' bottom "of the soil. dispersal. system "'and.'the
�41; ^a ;r.v11lr �n * „ i v *P� �^ ^x b- "I 1 -coin liance assessment must be vel�ried. This
NV 11vcL1v y uucul ucvU oV1Y Vl vvU1VV" ..... p ..... ..... ..... ..t ”'
vre:Yri "V.oncorrpleted..by. a .licensed..inspection business or
... qualified... employee
inspector with jurisdiction. Compliance must be ach.'eved.bydetermined either by
conducting new soil borings or by prior =Vrifiedons b soil separation
documentations made by two independent parties. The soil borings used for system
n
design or previous inspections - . s . -'a... r4YV c� +xnn........ vrP t;r�� Prv�ra +;nn �;s +a„ P
g p p L�u" LLil� LL� LL „11�1„LLL1V11. . v.,1L1„LLl �„�,LLILLL1V11 ,11�LLL11,,,,
rejJV l; YYi U.1 l: "VV V` LVU "LL1LLL iYYVYUUVJY:Y1V YYi'ii "L1YVU Vr "YYYV LYYVUS U.9V U"'LV YYiiYYiV LYYV i�1.1e.YJRYVYYY
and includes any p'revi'ous.--soil.--borings: The asse'ssme'nt' must be made'.'by ether "a licensed
inspection " " "or " "' design " " "busi'ness or a q'ual'ified employee inspector with Jurisdiction : ............ are
allowed to be used. if the verif�V lion soil separation report consi,ts of miff ations has
bee by two independent parties, a subsequent vetlrica*Lioadeterminat on
is not required unless requested by the i:: ^ rtor "b�rTeas^ to b4�:eve ^4^:plia�:t
VV11U1LYV11 VL115 G3'
(B) Sew' age' backup ..su'rface "seepi'ng ' or 'surfacc'd'isch'arge .. fro mowner or own.
required by the sstom"'m'Yastb: "'1�Y'Department or local unit of government..
(C) Determination of hydraulic r-, -coon reportperformance and other compliance in Section
4.3(1) must be completed tb the method or methods used to make the assessment.
by a licensed inspection business or a qualified
l YYV "Lti.'S.7V .9 JYYYV111L YYYiG[J L' l}'V 'YYYLtiUli li
employee
(B)(D) _A determination of operational performance and_other compliance in 4.3 (4) and
Section 4.4, must be completed by a licensed advanced inspection business, a qualified
employee with an advanced inspector certification with jurisdiction, or a service provider.
A passing report is valid until a new inspection is requested ur ifthe hydrauli; perY�lla�l; e is
VV YYV"i"iLU LV 11YtivV V11i1:YYVU.
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(4) A certificate of compliance or notice of noncompliance for an existing system compliance
inspection shallmust be based on the results of the verifications in item 23. The certificate of
compliance or notice of noncompliance_for an existing system corriphiMnee ixxspccti xx must be
signed by a licensed inspection business or a qualified employee certified as arr inspector with
jurisdiction. The certificate or notice for an existing system compliance inspection must be
submitted to the Department or local unit of government with jurisdiction and the property owner
or owner's agent no later than 15 days after a compliance inspection. The completed form must
also be submitted to the owner or owner's agent. The certificate of compliance for an existing
system compliance- inspectionY is valid for three years from the date of issuance, cven if one .,f unless
.....
a new ls.requested.bythe supportx�xg °rc �rt�. e �.res °bv xe::
..
re uired b the thr .. a �x.. xx .a.......a�...a.��. �.�,......���.�...�x.xxa��. �..��.��� ��.�ax.a���De artment or
y . --cl y. u: ....., w... �,..... . w. �.....� . � ........ . ..........� ..w... p
local unit of government.
(5) If a compliance inspection for an existing system indicates that the system is noncompliant, the
notice must be signed by a licensed inspection business or qualified employee certified as - ai.
inspector andwith jurisdiction, contain a statement to -that cffectof noncompliance and specify what
*^ �r,z Q.r ^pa.a:ee:the reason for noncompliance or each component as specified
in Section 8.13(3)
8.13 Periodically saturated soil disagreements.
(1) If a documented discrepancy arises on the depth of the periodically saturated soil between licensed
businesses for SSTS design or compliance purposes, all disputing parties must follow the procedure
outlined in this subpart.
(2) One or more of the methods in units (A) to (C) must be employed.
(A) Obtain an opinion from a qualified employee of the Department or local permitting authority
with jurisdiction, if the Department or local permitting authority is willing to provide an
opinion.
(B) Obtain an opinion from an SSTS technical evaluation committee, if a committee has been
developed for this purpose and is available and willing to render an opinion. The committee
must be created in cooperation with the commissioner.
(C) Obtain an opinion from a Minnesota licensed professional soil scientist who is a certified
SSTS designer or inspector and who is independent of, and agreed upon by, both parties.
(D) If options under Section 8.1513 (2)(A) or Section 8.415 .13_(2)(B) are not viable, an opinion
must be rendered under Section 8.15 13(2)(C).
(3) If opinions rendered in items Section 8.x5 (1) or Section 8. (2) do not resolve the dispute, all
initial and follow -up documents and information generated must be submitted to the Department or
local unit of government. The Department or local unit of government shall take into consideration
all information and opinions rendered and make a final judgment. The Department or local unit of
government shall render findings of fact, conclusions of law, and findings setting forth the reasons
for any final decisions it renders.
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(4) If a documented discrepancy arises on the depth of the periodically saturated soil between an SSTS
licensed business and the Department or local unit of government for SSTS design or compliance
purposes, all disputing parties shall follow the procedure outlined in this item.
(A) The Department or local unit of government and the licensed business must meet at the
disputed site in an attempt to resolve differences.
(B) If the provision in Section 8. 1513 (4)(A) does not resolve differences, then one or more of
the methods in Section 8.1513 (2)(B) or Section 8.1513 (2)(C), are allowed to be employed.
(C) If opinions in Section 8. (4)(B) are not sought or do not resolve the dispute, the
Department or local unit of government shall take into consideration all information and
opinions rendered and make a final judgment. The Department or local unit of government
shall render findings of fact, conclusions of law, and findings setting forth the reasons for
any final decisions they render.
(5) (5) ... ... ... ... ... Upon resolution of a dispute, amendments to initial disputed documents containing the
resolution shall be made and submitted to the Department or local unit of government and all other
parties involved.
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SECTION 9 SITE EVALUATION AND SOIL TESTING
9,1 Des" Site
Site evaluations consisting of preliminary and field evaluations according to parts this Section must be conducted
for all proposed sites for SSTS, including both ISTS and MSTS. The site evaluation is considered the first phase of
an SSTS design.
Preliminary Evaluation.
.
.9....2 . ......................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A preliminary evaluation for individual subsurface sewage treatment systems shall consist of determination,
location, or existence of the following itelmis:
(1) (1. ) ........................Design flow for, anticipated effluent concentrations of biochemical _oxygen_demand, total
suspended solids, oil and grease, and anticipated presence of nondomestic waste from the dwelling,
dwellings, or other establishments.
(2) (2) - Proposed or existing:
(A) ( ^;- -Water supply wells within 100 feet of the proposed SSTS;
(B) (B) Existing and proposed buildings or improvements on the lot; and,
(C) (C) .....�..� Buried water supply pipes within 50 feet of the proposed system.
(3) (3) ...... --- Easements on the lot.
(4) (4) The ordinary high water level of public waters, if adjacent to the lot.
(5) (5) . Floodplain designation and flooding elevation from published data or data that is
acceptable to and approved by the Department or local unit of government or the DNRMinnesota
Department of Natural Resources, if applicable.
(6) (6) Property lines.
(7) (7) ........................All required setbacks from the system.
(8) (8) The soil characteristics at the proposed soil treatment and dispersal areas as obtained by the
soil survey report, including the soil map, map units, landscape position, parent material, flooding
potential, slope range, periodically saturated soil level, depth to bedrock, texture, color, depth to
redoximorphic features, and structure and consistence of soil horizons.
(9) (9) ........................A geocode or property identification number.
(10) (10) —Names of property owners.
(11) (r..1) ..................Th inner wellhead management zone or wellhead protection area of a public water supply,
if applicable.
9.3 Field Evaluation.
..
A field evaluation for an individual subsurface sewage treatment system shall consist of the following items:
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(1) Lot lines. Lot lines shall be ' u *h^ fle usi:: ^the :::ost recent doca:::ent
source Lot improvements,
...
required setbacks, and easements must be identified.
(2) (2) ... ... ... ... ..Surface features. The following surface features must be described:
(A) (�) v The percent and direction of the slope of the proposed system location.
(B) (B) Vegetation types.
(C) (C ) ...........................Any evidence of cut or filled areas or disturbed or compacted soil.
(D) (D) - -The flooding or run -on potential.
(E) (E) A geomorphic description.
9.4 Minimum Size, Soil Treatment Area .
For new subdivision ^r a ^* �ppx^ -_l testing, enough soil observations must be conducted to assure that at least
10,000 square feet of suitable soil exists for each lot for long -term sewage treatment outhning wn areu with. On
previously subdivided tots, enough ;,pace on the lotarea of suitable soil must be identified for two soil treatment and
d ispersal
r
areas... ..,.l ++-A ro .. t � + r.
. , n nnn... q ro �+ percolation tests are not required for
. + .r.ust �
subdivision or lot approval testing unless the permeability cannot be estimated or there is reason to believe the soil
is not original or has been disturbed.
9.5 Soil observations.
Complete soil testing on each individual lot must be conducted prior to permit issuance independent of any prior
subdivision or lot approval testing. For permit issuance, a minimum of four (4) soil observations out - lining -are
encompassing the proposed sewage treatment area of S 000 square feet are required. At least one soil observation
must be performed in the portion of the soil treatment area anticipated to have the most limiting conditions. Larger
areas may be required where conditions of use, soils, topography, or vegetation require. Soil observations must
comply with the following requirements:
(1) ( ...... ---The soil observation must be conducted within or on the borders of the proposed site;
(2) (2) The soil observations must be performed in an exposed pit or by hand augering or probing.
The use of flight augers is not allowed.;
(3) (3) ...... ---The soil observation method must allow observation of the different soil horizons that
constitute the soil profile and, if determining the loading rate by use of Table L� in - ..nnesotµ
1 - _r�, p *e.- 7080.2, 50'`VI an undisturbed soil st�uc- 'sample must be observed.,
(4) ......................... (4) - Underground utilities must . be before soil observations are undertaken
............................................................................................................................................................................................................. ...............................
(5) . ....................... Required,. safety,,, precautions,. must,. be,. taken,. before,. entering,aoil,,,pits,,
(4)(6) .. Soil observations must be conducted prior to any required percolation tests to determine whether
the soils are suitable to warrant percolation tests and, if suitable, at what depth percolation tests
shall be conducted.; and
.......................
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(5;(7) (5) ........................The minimum depth of the soil observations must be to the periodically saturated layer, to
the bedrock, or three feet below the proposed depth of the system, whichever is less.
°% 9.6 ..... Soil descrilptions for determination of limiting layers.
Each soil profile observed at the proposed soil treatment and dispersal area must be evaluated under adequate light
conditions with the soil in a moist unfrozen state for the characteristics in items (1) through (8):
(1) (1) The depth of each soil horizon measured from the ground surface. Soil horizons are
differentiated by changes in texture, color, redoximorphic features, bedrock, structure, consistence,
and any other characteristics that affects water movement or treatment of effluent.,
(2) (2 ........................A description of all soil colors for each horizon according to the Munsell Soil Color Charts,
Revised Edition, Munsell Color Corporation (1992), or equivalent. The color charts are
incorporated by reference, are available through the Minitex interlibrary loan system, and are not
subject to frequent change,;
(3) (3) ... ... ... . ... A description of the soil texture, and structure using the United States Department of
Agriculture (USDA) soil classification system as specified in the Field Book for Describing and
Sampling Soils, which is incorporated by reference under Section 2.2 (46).
(4) (4) Depth to bedrock.
(5) ( 5) ........................Depth to periodically saturated soil for new construction or replacement as determined by
redoximorphic features and other indicators, as determined in subitems (A) to (C):
(A) (A) In subsoil and parent material, redoximorphic features include:
ODistinct redoximorphic iron accumulation or distinct redoximorphic iron
depletions;
ii. (ii) A gleyed or depleted soil matrix or redoximorphic mottles having a color
chroma of two or less or a depleted matrix or redoximorphic mottles having a color
hue of 5Y and a chroma of three or less; or
iii. ����; Faint redoximorphic concentrations or faint redoximorphic depletions in
subsoil or parent material with a hue of 7.5YR or redder.
(B) (B) f In lower topsoil layers that are deeper than 12 inches from the surface and are
immediately followed in depth by a periodically saturated horizon, redoximorphic features
include:
(.0Soil colors with a redoximorphic chroma of two or less; or
ii. (ii) Redoximorphic accumulations or depletions.
(C) (C) .............. In the upper 12 inches of the topsoil layer, if it is immediately below. which. -occurs
followed by a periodically saturated horizon, the depth of seasonal saturation is determined
by one or more of the indicators in units (i) to (vv ):
(i colors with a chroma of zero;
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Organic soil textures or mineral soil textures with an organic modifier;
Dominance of hydrophytic vegetation;
iv. (iv) ... .....................The soil treatment area at or near the elevation of the ordinary high water
level of a surface water or in a concave hill slope position;r
V. (v) Redoximorphic accumulations or depletions., or
V i .........( The soil expressing indcators_of seasonal. saturat....... as rmined m
Indicators of Hydric _Soils in the United States: A Guide for Identifying and
Delineating Hydric Soils, USDA Natural Resource Conservation Service (2006 and
subsequently amended). The field indicators are incorporated by reference, are
available throu the Minitex interlibrary loan s ystem , and are subi ect to freq
change.. _ _ ._ x
e..
(6) Depth to periodically saturated soil for all existing systems, determined by redoximorphic features
in item (5), except subitems (B), unit (i), and (C), units (i), (iii), and (iv), as measured outside the
area of the system influence in an area of similar soil.
(7) ' Depth of standing water in the soil observation excavation, measured from the soil surface,
if observed.
(8) ...... ---Any other soil characteristics that needs to be described to design a system, such as
hardpans or restrictive layers. These other characteristics must be classified according to the Field
Book for Describing and Sampling Soils, which is incorporated by reference under Section 2.2
(46).
9.7 Determination of loading rate and absorption area size.
The effluent loading and absorption area size must be determined by either item (1) or (2).
(1) (1) f The loading rate based on an examination of soil texture, undisturbed soil__structure, and
soil consistence at the depth of either the absorption area or the most li�:it�Y�grestnctiye
layer within 12 inches below-three feet of the proposed soil absorption area using the United States
Department of Agriculture (USDA) soil classification system as specified in the Field Book for
Describing and Sampling Soils, which is incorporated by reference under Section 2.2 (46); or
(2) (2) The loading rate based on the percolation procedure described in subitems (A) to (H).
(A) (A.) ............. Each test hole must be six to eight inches in diameter, and_have vertical sides
be locates at.1he d'ptl: of tl:: pr—pos�d sail µboo Nti�n x; µ. For mounds and at -grade
systems, the bottom of each test hole must be in the upper 12 inches of the original soil. For
trenches and seepage beds, the bottom of each test hole shallmust be at the depth of either
the p area .. ro osed abso tion or the most restrictive laver within three feet of the ... ro p osed
.......... p ............... ............................... ......................................................................................................................... ............................... ................................................................................................... ............................. ......................
$oil absorption area;
(B) (B) - -- Soil texture descriptions for percolation test holes must note the depths from the
ground surface where texture changes occur;
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(C) (C ) ...........................The bottom and sides of the hole must be carefully scratched to remove any
smearing and to provide a natural soil surface into which water penetrates. The scarification
must not result in the hole having a diameter of greater than eight inches;
(D) (M ............ All loose material must be removed from the bottom of the test hole and two inches
of one -fourth to three - fourths inch gravel or clean sand must be added to protect the bottom
from scouring;
(E) (E) The hole must be carefully filled with clear water to a minimum depth of 12 inches
from the bottom of the test hole and maintained for no less than four hours for saturation to
occur. The soil must then be allowed to swell for at least 16, but no more than 30, hours. In
sandy soils, the saturation and swelling procedure is not required and the test is allowed to
proceed if the initial filling of the hole with 12 inches of water seeps away in less than ten
minutes;
(F) (F) In sandy soils, water depth must be adjusted to eight inches over the soil at the
bottom of the test hole. From a fixed reference point, the drop in water level must be
measured in inches to the nearest 1/16 inch at approximately ten - minute intervals. A
measurement is also allowed to be made by determining the time it takes for the water level
to drop one inch from an eight inch reference point. If eight inches of water seeps away in
less than ten minutes, a shorter interval between measurements must be used, but water
depth must not exceed eight inches. The test must continue until three consecutive
percolation rate measurements do not vary by more than ten percent. In other soils, the
water depth must be adjusted to eight inches over the soil at the bottom of the test hole.
From a fixed reference point, the drop in water level must be measured in inches to the
nearest 1/16 inch at approximately 30- minute intervals and refilled between measurements
to maintain an eight inch starting head. If water seeps away in less than 30 minutes, a
shorter time interval between measurements must be used, but water depth must not exceed
eight inches. The test must continue until three consecutive percolation rate measurements
do not vary by more than ten percent. The percolation rate is also allowed to be determined
by observing the time it takes the water level to drop one inch from an eight -inch reference
point if a constant water depth of at least eight inches has been maintained for at least four
hours prior to the measurement;
(G) (�;.....m.. —The time interval must be divided in minutes by the drop in water level in inches to
obtain the percolation rate in minutes per inch. The percolation rates that are within the ten
percent provision determined for each test hole must be averaged to determine the final
percolation rate for that hole. The slowest final percolation rate for all holes within the soil
dispersal area must be used for design; and
(H) (1 4) ..........................A percolation test must not be run where frost exists within 12 inches of the bottom
of the percolation test hole.
9.8 Phase _I,, Site Evaluation Reporting.
A written report on the site evaluation fix x YYYdx ideal sabsa ice sewvage rreatxxxeYYt system, must be prepared and
include the following:
(1) (1) v Preliminary and field evaluation results from Sections 9.2 through 9.6.7
(2) (2)----- -Dates of preliminary and field evaluations.
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(3) (3) Design calculations using_ the most current version of the design forms furnished by the
University of Minnesota.
(3)(4) ........A map drawn to scale or dimension, with a north arrow, and including:
(A) (A) horizontal and vertical reference points of the proposed soil treatment and dispersal
areas, soil observations, percolation tests, and pertinent distance from the proposed SSTS to
all required setbacks, lot improvements, easements, ordinary high water mark of public
waters, property lines, and direction and percent slope.
(B) (B)...... —.. the location of any unsuitable, disturbed, or compacted areas.
(C) (C) the access route for system maintenance.
'A'(5) (4) The estimated depth of periodically saturated soil layer, bedrock, or flood elevation, if
appropriate.
,�)(6) _( ...... ---The proposed elevation of the bottom of the soil treatment and dispersal system.
(6)(7) (6) Anticipated construction related issues.
(7)(8)... (7) ...... ---The name, address, telephone number, and certified statement of the individual conducting
the site evaluation.
"NO) '" An assessment of how known or reasonably foreseeable land use changes are expected to
affect system performance, including, but not limited to, changes in drainage patterns, increased
impervious surfaces, and proximity of new water supply wells.
(9)(10)_(9) ...... ---A narrative explaining any difficulties encountered during the site evaluation, including,
but not limited to, identifying and interpreting soil and landform features and how the difficulties
were resolved.
-A notation of any differences between observed soil characteristics and those
identified in the soil survey report.
9.9 Soil testing required.
... ......... ......... ..........
Applicants for subsurface sewage treatment system permits, site approvals or subdivision approvals will be required
to submit soil test data from soil borings and percolation tests, or soil pits, for each proposed site or installation.
The minimum testing shall be that necessary to verify suitable conditions for two complete soil dispersal and
treatment areas.
9.10 Qualifications.
All soil testing shall be conducted in accordance with the requirements of this Chapter and shall be conducted by
appropriately licensed businesses and certified individuals in accordance with Minnesota Rules, Chapter 7083.
9.11 Site Protection.
... .........
Prior to and during construction or lot improvements, the proposed initial and replacement soil treatment and
dispersal areas shall be protected from disturbance, compaction, or other damage by use of stakes and silt fence or
snow fence.
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9.12 Utilities.
Underground utilities must be located before soil observations are undertaken. Required safety precautions must be
taken before entering soil observation pits,
} xz U. d ro �' = t�= + i$�" = i $ wv..i+i v a vsa ': v :�$3 1 +'i ': $'$ '' .: =: x.' 'rriu" tr vLy.
�....,,.a. s+ 1" - +.<, r. r ...1. F r + ra r ..... a; l .. a1, . � +.;.. , x,. +....
1JIVVLLU LlVRJ 111UJL VV GiA VV1V1V V11LVxxxx� JVx1 VVJVl VQLl V11
F
9.13 Mound soil testing.
Where soil tests require a mound, testing and design must clearly show suitable area for installation of two (2)
complete mounds. Where site conditions are such that the only backup mound will likely be disturbed, the
Department, at its discretion, may require both mounds to be constructed at once.
9.14 Compliance.
Designs for new construction or replacement SSTS must comply with all applicable requirements and any other
applicable codes, rules, and laws.
9.15 Phase II Reporting.
......... .........
Phase II desi re ports must include detailed drawin desi flows, system component sizin and calculations,
hy draulic and or loading rates, setbacks location and elevations for construction, and mana plans as
described. m Section. 22 and..a certified statement
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SECTION 10 MSTS SITE EVALUATION AND SOIL TESTING
1 10 1 of Soil Site
Soil and site evaluations must be conducted for MSTS design. The evaluations must be conducted according to this
Section and Section 9 of this Chapter. Evaluations must identify and delineate an initial and replacement soil
treatment and dispersal area with appropriate system boundaries.
10.2 Preliminary Evaluation.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A preliminary evaluation for midsized subsurface sewage treatment systems shall consist of determining:
(1) (1) ...... ---The design flow-arkt, anticipated effluent concentrations of biochemical oxygen demand,
total suspended solids, and fµts moils oil and grease, and —As- anticipated presence of n n.....
dom.— Isticnondomestic waste from the dwelling, dwellings, or other establishments.
(2) (2) - Whether the location of water supply wells impacts the location of the system due to
setback constraints.
(3) (3) ...... --- Whether building improvements will be within 50 feet of the proposed soil treatment and
dispersal area.
(4) (4) Whether buried water supply pipes will be within 50 feet of the proposed system.
(5) (5) ........................Whether easements will be within 50 feet of the proposed system.
(6) (6) Whether the ordinary high water level of public waters will be within 500 feet of the
proposed soil treatment and dispersal area and if so, a preliminary assessment of phosphorus
impacts to the surface water.
(7) (7) ...... --- Whether the system will be located in a floodplain and the system location in relation to the
100 -year flooding elevation from published data if available or data that is acceptable to the
Department or local unit of government.
(8) (Q) The required setbacks from the proposed soil treatment and dispersal system.
(9) (c) ...... ---The soil survey information on the proposed soil dispersal area, including the soil map,
map units, landscape position, parent material, flooding potential, slope range, periodically
saturated soil level, depth to bedrock, texture, color, and structure of soil horizons, and permeability
of soil horizons.
(10) (10) ......... A geocode or property identification number.
(11) (11) The names of the property owners; and
(12) ( 1 2) The location of the system on a United States Geological Survey quadrangle map of the
proposed soil treatment and dispersal area and the area within one mile.
10.3 Field Evaluation.
Before conducting a field evaluation the designer shall confer with the Department <r local unit - go��er �Mcnt to
determine the requirements and scope of the evaluation, dependent upon system size, soil conditions, and other
applicable factors. At a minimum, the requirements in this Section must be met:
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(1) (1) - Property Marks Property lines must be confi in identified as acceptable to the field
using th„ most recent document source.owner. Site improvements, required setbacks, and
easements must be identified, located, and marked.
(2) (2) '' -' -" "Site Area. A general evaluation and description of the proposed soil dispersal area,
including a general geomorphic description, current land use, and past land use, if known, must be
provided.
(3) Q Features.... The following surface features must be identified and described:
(A) (,; " " " " " " " " " " "" "The dominant vegetation.
(B) (B) - — Evidence of disturbed or compacted soil or flooding or run -on potential.
(C) (C) Landscape position, including landform, slope gradient, slope direction, and
surface morphometry as described in the Field Book for Describing and Sampling Soils
Version 2.0, September 2002, developed by the National Soil Survey Center and Natural
Resources Conservation Service of the United States Department of Agriculture. The field
book is incorporated by reference, is not subject to frequent change, and is available through
the Minitex interlibrary loan system.
(4) 1.. 0..4 ................. Soil _Pits.
(A) Soil pits are required to investigate the soil for MSTS design. The required number of soil
pits to adequately define the proposcd sitelimiting laver and soil
dispersal system sizing must be determined by the professional judgment of the dcsigner as
_.
based on the size of the area, and of the soil, and must approved by the
Department "'o xGxcaI""YkYYYtf" V"'V l'iYY'YY'YY�V YYt.
(B) 10.5 The qualifying soil observation pits to be used for the MSTS design must be
located on or near the borders of the proposed soil treatment and dispersal area. Soil
observation pits must be dug outside the soil dispersal area, if possible. The soil must be
observed and described to a depth of at least three feet below the proposed depth of the
system. Other soil observation pits are allowed to supplement the required soil observation
pit information.
10 6
st talon bef�r� �tng s�ilbscti�n ..pits:
(C) Underground utilities must be located before soil observations are undertaken. Required
safety _precautions must be taken before entering soil observation pits.
10. 4 ......... SAO .. Description..
The following soil observations must be made:
(1) (1) " "" ---The soil properties and features described in items (A) to (M) must be described according
to the Field Book for Describing and Sampling Soils, whichversion 2, Natural Resources
Conservation Service, United States Department of Agriculture (September 2001), for each soil
horizon at each qualifying pit. The field book is incorporated by reference under Section 2.2 (46).
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(A)
(,;Matrix
soil color.
(B)
(B)
Soil features that have different colors from the matrix color, including, but not
limited to, clay films, organic stains, silt coats, nodules, and concretions.
(C)
(C) ... ... ...
. ... . Abundance, size, color, and contrast of redoximorphic features.
(D)
(D)
v Soil texture, with modifiers.
(E)
Grade, size, and shape of soil structure.
(F)
(F) .. ..........................Moist
soil consistence.
(G)
(G)
- — Abundance and size of rock fragments.
(H)
(H)
- Abundance and size of roots.
(I) (T) .............. Horizon boundary conditions.
(7) (1T) Parent materials.
(K) (u)............. Pores, quantity and size.
(L) (T I .............. Quantity of boulders and tree stumps affecting construction.
(M) (M) Any other characteristics of feature that affects permeability of the soil or treatment
of sewage effluent.
(2) The depth to bedrock, if encountered, must be determined by the require- m ,ntsdefinition in Section
2.2(9). - -
(3) The elevation of standing water evident in any soil pit must be identified.
(4) The soil must not be described when frozen, at improper moisture content, or under poor light
conditions.
10.Q 5 Method.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic conductivity testing of the soil must be employed, along with a determination of the soil's texture,
structure, and consistence, to determine the loading rate of effluent in the soil. The frequency of observations and
measurements must be determined by the professional judgment of the designer, dependent on the variation in soil
conditions and the system size, with the frequency of the observations and measurements approved by the
Department or 1oca —I unit of g =� „r gym; Wit.
10 10.6 Comparison with Soil Survey.
All field soil information gathered must be compared with soil survey information. Any discrepancies shall be
identified.
10.1x7 Site and Soil Information.
Site and soil information gathered in Section 10.2 through Section 10.96 must be interpreted for suitability for
MSTS siting, design, and construction, with consideration of the following:
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(1) (1) Surface features impacts from precipitation, run -on, and interflow or any other item that
could have potential to adversely impact the ability of the soil to accept water.
(2)
(2) ......
--- Cultural features, including, but not limited to, setbacks and easements.
(3)
(3) ......m
-- Site conditions affecting system layout, distribution system requirements, and
constructability.
(4)
(4)-
- Layers of coarse soil textures that affect treatment.
(5)
(5)
Disturbed, compacted, cut - filled, or other unnatural condition, if present.
(6)
(6)
The uniformity of the soil over the site.
(7)
(7)
Future surrounding land use changes.
(8)
( -) ......�
--Soil sizing factor or loading rate.
(9) (9) An approximation of the rise in groundwater from system operations as determined by a
groundwater mounding asseasmelitcalculations. A narrative evaluation of the accuracy of the
approximation must be provided. The approximation must be related to the requirements in Section
16.5(7).
10.11 S ........ Fringe.
Systems proposed to be located in flood fringes must determine feasibility of relocating the system outside the
floodplain.
10.12 9 Depth.
The limiting layer in the soil shall be determined based on the depth of bedrock or periodically saturated soil if
encountered. The depth of periodically saturated soil shall be determined according to Section 9.6 (5), and the
depth to bedrock shall be as defined in Section 2.2 (9).
10.13 10 .Site Protection..
The proposed soil treatment and dispersal areas shall be protected from disturbance, compaction, or other damage
by use of stakes and silt fence or snow fence.
10.1^.....1 Soil Site.Report
All information gut�eredrequ red in Section 10.2 through Section 10 1210 must be submitted for review airy
approved by the Department or local unit of government prior to final design. The submittal must also contain:
(1) (1) — A map of the proposed soil dispersal area, drawn to scale, showing:
(A) (A - Features with a setback within 150 feet of the system..;
(B) (B) m..m Easements within 50 feet of the system:_;
(C) (C) Floodplains, wetlands, and surface waters, within 100 feet of the system.
(D) (D) -- -- Location and elevation of all soil pits, borings, and hydraulic tests...,
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(E) (E) Two -foot contour lines.
(2)
(2)
- Dates and weather conditions during the field evaluations.evaluation;
(3)
(3) ... ... ...
... ... Elevations of the periodically saturated soil or bedrocks
(4)
(4)
v Proposed depths of the system bottom.,
(5)
(5)
- -- Proposed soil loading rate.
(6)
(6 ) ........................System
site boundaries:;
(7)
(7)
- Anticipated construction related issues..,
(8)
(Q)
The name, address, telephone number, and certified statement of the individual conducting
the site
evaluation.; and
(9) (9) -A narrative explaining any difficulties encountered during the site evaluation, inehad:u
such as, but not limited to, identifying and interpreting soil and landform features, and how the
difficulties were resolved.
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SECTION 11 GROUNDWATER INVESTIGATION
11.1 N ecessity of Investigation.
A preliminary groundwater assessment YVl 111LY1 �� YY YYYY�u LJ 1� u must be conducted for all
proposed MSTS according to this Section.
11.2 Preliminary Investigation.
The following information must be ascertained from the best available information:
(1) (1) - -The size of the soil dispersal system, proposed loading rate, and system geometry.,
(2) (2 ........................The geocode(s) or parcel identification number(s) of the parcel(s) where the proposed soil
dispersal area is to be located:;
(3) (3) Any anticipated discharges from nondomestic sources to the proposed MSTS.,
(4) (4) ... ... ... ... . The location of the MSTS on a United States Geological Survey quadrangle topographic
map, including the area within a one -mile radius of the proposed soil treatment system.;
(5) 05 A determination of the general geology, periodic soil saturation, regional groundwater
setting, and aquifers used for water supply and a description of the general site hydrology
characteristics, including, but not limited to, identification and estimated depth measurements to
geologic units and aquifers, and identification of groundwater confining strata:;
(6) (6) A determination whether the proposed system is in a drinking water supply management
area, inner wellhead management zone, source water protection area, or groundwater sensitive
area spc ;.,i "
+; ,
, or a S�V GtiYt VV VYY 'villi.T i;l IiGLY ViI "ZLY GIY,
(7) (7) ...... ---An assessment of all water supply wells within a 300 -foot radius of the proposed soil
treatment area with a minimum assessment of well locations and casing depths from well
construction log records. If no records exist, the well locations and casing depths must be
estimated.,
(8) (8) ........................A determination or estimation of groundwater flow direction and
(9) (9) An assessment of pathogenic organism nitrogen and- phosph- :-�u� -s impacts from the system.
11.3 Field .or Further Investigation.
The designer must consult with the Department g o vem.ment to determine whether the Department or
local unit of government will require a field or further groundwater investigation and, if so, the extent of the
investigation. The field or further investigation must be conducted if information gained in Section 11.2 indicates that
a proposed system is a potential contaminant threat to a regional water table, an aquifer, water supply well(s), or
surface waters. The threats of concern include, but are not limited to, fecal organism contamination, nitrate
contamination, or phosphorus impacts to surface waters.
11.4 Monitoring,
The designer must consult with the Department or -locµl 1unit cf g ^vern:c:t -to determine if the Depart:::ent or'.ccaa
uir.1 of gc �rnmellt wily quire -- effluent or groundwater monitoring is required and, if so, the extent of the monitoring.
Monitoring must be conducted if information gained in Section 11.2 and 11.3 indicates that a proposed system is a
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potential contaminant threat to a regional water table, an aquifer, or a water supply well or impacts surface waters.
The potential groundwater mound height must be monitored under all MSTS during operation.
11.5 HXdrolo.g cal..Interpretations.
The information gathered in this part must be used to estimate or measure if the system adequately protects the
groundwater and surface water as prescribed in part. Section 4.08. The interpretation must include an evaluation of
whether contaminant plumes will intersect water supply well capture zones.
11.6 Groundwater
All information required in th S partSection l must be submitted for review and approval of the Department or local
rtfo �„�rxr:rert prior to final design, including all applicable information delineated on a map.
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SECTION 12 SEWAGE FLOW DETERMINATION
12.1 Design System Design..
Completion of tasks outlined in Section 12 to Section 21 is considered the second phase of SSTS design.
12.2 Design Flow,
The estimated design flow for any dwelling must provide for at least two (2) bedrooms. For multiple or multifamily
dwellings, the design flow consists ; fthe < the design flov�s �r each ���dhidu_
o-... l itmust be calculated
according to Section 12.4 to 12.6.
12.3 Design Flow by Bedrooms.
The estimated design flow for dwellings is based on Table I, which is based on calculating the number of bedrooms
by 150 gallons per day. For more than six bedrooms, the design flow is determined by multiplying the number of
bedrooms by 150 gallons per day.
Table I
Number of
Bedrooms
Gallons Per
Da
2
300
3
450
4
600
5
750
6
900
12,4 12.4 Sum of design flow for existing dwellings..
...
The design flow for MSTS serving existing dwellings is determined by the following calculation in conjunction
with Section 12.3:
Total flow from the ten highest flow dwellings + (total flow from the remaining dwellings X 0.45)
12.5 New housing developments.
..........
For new housing developments to be served by a common SSTS, the developer shall determine and restrict the total
number of bedrooms for the development and determine the design flow by multiplying the total number of
bedrooms by 110150 gallons per day. If the ultimate development of phased or segmented growth meets or exceeds
10,000 gallons per day, the initial system or systems and all subsequent systems require a state disposal system
permit.
12.6 Additional Capacity
If construction of additional dwellings or bedrooms, installation of water -using devices, or other factors likely to
increase the flow volumes can be reasonably anticipated, the SSTSMSTS must be designed to accommodate the
additional capacity as determined by the Department or local uYYYt of go GeYxxYYYeYYr.
12.7 Design Flow Determination for Other Establishments
Design sewage flow and waste concentration levels for other establishments with a flow of 5,000 gallons per day or
less are determined by methods in item (1) or (2):
(1) (1) ..._._ -The design flow of sewage for i`✓T�TS serving-other establishments is estimated using Table
II.
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(2) ( .2.) ........................The measured design flow of sewage for MST-S so: ping other establishments is determined
by averaging the measured daily flows for a consecutive seven -day period in which the
establishment is at maximum capacity or use.
Table II — Estimated Design Sewage Flow from Other Establishments
Dwelling Units
(also see outdoor recreation)
Unit
Design Flow
(gallons/day/unit)
Hotel or luxury hotel
Guest
55
Square Foot
0.28
Motel
Guest
38
Square Foot
0.33
Rooming House
Resident
45
Add for each non - resident meal
3.3
Daycare (no meals)
Child
19
Daycare (with meals)
Child
23
Dormitory
Person
43
Labor Camp
Person
18
Labor Camp, semi permanent
Person
50
Commercial /Industrial
Unit
Design Flow
(gallons/day/unit)
Retail Store
Square Foot
0.13
Customer
3.8
Toilet
590
Shopping Center
Employee
11.5
Square Foot
0.15
Parking Space
2.5
Office
Employees /8 -Hour Shift
18
Square Foot
0.18
Medical Office*
Square Foot
1.1
Practitioner
275
Patient
8
Industrial Building
Employees /8 -Hour Shift
17.5
Employees /8 -Hour Shift with Showers
25
Laundromat
Machine
635
Load
52.5
Square Foot
2.6
Barber Shop
Chair
68
Beauty Salon
Station
285
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Flea Market
Nonfood vendor /space
15
Limited food vender/space
25
With food vendor /space
50
Eating and Drinking
Establishments
Unit
Design Flaw
( allons /da /unit)
Restaurant (does not include bar or
lounge)
Meal without alcoholic drinks
3.5
Meal with alcoholic drinks (open 16 hours or
less)
8
Seat (open 16 hours or less)
30
Seat (open more than 16 hours)
50
Seat (open 16 hours or less, single service
articles)
20
Seat (open more than 16 hours, single service
articles)
35
Restaurant — short order
Customer
7
Restaurant — drive -in
Car Space
30
Eating and Drinking
Establishments
Unit
Design Flow
(gallon s /da /unit
Restaurant — carry out, including
caterers
Square Foot
0.5
Institution Meals
Meal
5.0
Food Outlet
Square Foot
0.2
Dining Hall
Meal
8.5
Coffee Shop
Customer
7
Cafeteria
Customer
2.5
Bar or lounge (no meals)
Customer
4.5
Seat
36
Entertainment Establishments
Unit
Design Flow
( allons /da /unit)
Drive -in Theater
Car Stall
5
Theater /Auditorium
Seat
4.5
Bowling Alley
Alley
185
Country Club
Member (no meals)
22
Member (with meals and showers)
118
Member (resident)
86
Fairground and Other Similar
Gatherings
Visitor
1.5
Stadium
Seat
5
Dance Hall
Person
6
Health Club/Gym
Member
35
Outdoor Recreation and Related
Lodging Facilities
Unit
Design Flow
(gallon s/da /unit)
Campground
PersonCampsite with sewer hook -up (per
person
3632
SiteCampsite with sewer hook -up (per
person /site
100
Sit: Campsite without sewer hook -up, with
central bathtoilet or shower facility (per site)
6250
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Transportation
c; +o ho hoo
. ice + v. am psite wit out sewer with
central toilet or shower. facility., served by
central dump station (per site)
n s
� �. 63
Permanent Mobile Home
Mobile Home
225
Camp, day without meals
Person
20
Camp, day and night with meals
Person
45
Resort/Lodge Hotel
Person
62
Cabin, resort
Person
50
Retail Resort Store
Customer
4
Park or Swimming Pool
Guest
10
Visitor Center Visitor 13
Transportation
Unit
Design Flow
(gallon s/da /unit)
Gas Station /Convenience Store
Customer
3.5
Service Station*
Customer
11
Prison or Jail
Service Bay
50
Nursing Home, other adult
congregate living
Toilet
250
Other Public Institution
Square Foot
0.25
Car wash* (does not include car
wash water)
Square Foot
5
Airport, Bus Station, Rail Depot
Passenger
5
School (with cafeteria, gym, and
showers)
Square Foot
5
School (boarding)
Re stroom
565
Institutional
Unit
Design Flow
(gallons/day/ nit)
Hospital*
Bed
220
Mental Health Hospital*
Bed
147
Prison or Jail
Inmate
140
Nursing Home, other adult
congregate living
Resident
125
Other Public Institution
Person
105
School (no gym, no cafeteria, and no
showers)
Student
14
School (with cafeteria, no gym, and
no showers)
Student
18
School (with cafeteria, gym, and
showers)
Student
27.5
School (boarding)
Student
95
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Church
Seat
4
Add for each meal prepared
5
Assembly Hall
Seat
4
Miscellaneous
Unit
Design Flow
(gallons/day/unit)
Public Lavatory
User
5
Public Shower
Shower Taken
11
* Waste other than sewage is only allowed to be discharged into the system if the waste is suitable to be discharged
to groundwater.
.118 12.8 Employees in Design Flow Calculation.
Unless otherwise noted in Table II, the flow values do not include flows generated by employees. A flow value of
15 gallons per employee per eight hour shift must be added to the flow amount for determining the design flow for
other establishments. Design flow determination for establishments not listed in Table II shall be determined by the
available information and approved by the Department.
A- +- - ,;,,., +;o VYi F \JY l;� +_A ;" r,1,1- TT �1, 1l l,o ao +o,,,,; ,o a 1,�. +h- 1, _
i �.i i3VJi 11 "iYV VV UGI.ViiYYYYYLLLi 'V JLiiV11JYYYYYGYILJ iYV L "lYJ LV U YLLVly li 011"1 VG UVLV iYYYYYIG LY V2� LIYV VLLJCJ
available information and approved by the Depart ment or by the local unit cif govem. went..
12-.10 12.9 Measured Flow
The measured ... flow of sewage for existing othcrOther establishments may be used to modify estimated flow values
determined in this part if the length and frequency of the measured flow accurately represents the annual average
water use, along with the peak weekly and daily water use.
12.1x 10 Infiltration.
...
The design flow for MSTS must also include 200 gallons of infiltration and inflow per inch of collection pipe
diameter per mile per day with a minimum pipe diameter of two inches to be used for the calculation. Flow values
are allowed to be further increased if the system employs treatment devices that are exposed to atmospheric
conditions that will infiltrate precipitation. Flow estimates as calculated in this Chapter shall not be relied upon for
the design of collection systems.
12.12.....11 Waste Concentration.
If concentrations VY "'VYV IYYVYY'Y'Y'C YLY "Yr YY LY YYiLYiYL YVYYi. YGJ�3 YYYkV CY JV YYYkS; YxY1 %YYi LrYYLY V(YJV from the sewage are
expected to be higher than 175170 mg/L 65 BOD_(or 125 mg /L_of CBOD 60 mg /L TSS, or 25 mg /L
__ "fiwly of oil and grease, , or if the design is for an Other Establishment or MSTS, an estimated or measured
1wT,wL1 �.,1
average concentration must be determined and be acceptable to the Department or local Unit of gover �ment.
System design must account for concentrations of these constituents so as to not cause internal system malfunction,
such as, but not limited to, clogging of pipes, orifices, treatment devices, or media.
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SECTION 13 SEWAGE TANKS
13.1 Sewage .. Tanks General.
Sewage tanks serving SSTS must meet or exceed the applicable requirements of this Section unless otherwise
approved by a Minnesota licensed professional engineer and approved by the Department or-thV Deal ixirit of
government.
13.2 Tank Strength Requirements.
Tanks, fittings, risers, and apertures must:
(1) (1) ...... ---Be capable of supporting long term vertical loads for the conditions in which the tank will
be placed. These loads include, but are not limited to, saturated soil load, based on 130 pounds per
cubic foot.
(2) (2) Be capable of withstanding a lateral load for the conditions the tank will be placed.
(3) (3) ... ... ... ... . With proper maintenance and venting, not be subject to failure due to corrosion and
degradation from sewage or sewage gases, including risers and maintenance hole covers.
(4) (4) —Be structurally capable of withstanding exposure and stresses from freezing conditions.
13.3 Poured -in -place concrete Tanks.
........ ...::::::
Poured -in -place concrete tanks must be designed to meet each requirement in Section 13.2, and be designed by a
Minnesota licensed professional engineer.
13.4 Septic Tank Design
Septic tanks must:
(1) (1) ......� --Have a liquid depth of at least 30 inches. Any liquid depth that is greater than 84 inches
must not be used when calculating the septic tank liquid capacity.
(2) (2) Have a minimum of six feet between the inlet and outlet of the tank, rather than between
compartments, or have a minimum of six feet from the inlet of the first tank to the outlet of the last
tank in series.
(3) (3) - -- If site conditions warrant, the inlet and outlet are allowed to be located on walls that are not
opposite each other along axis of the maximum dimension; however, the requirements of Section
13.4 (2) must be met.
(4) (4) ......m -- Have an inlet invert at least two inches above the outlet invert.
(5) (5) v Have a reserve or storage space between the liquid surface and the top of the inlet and
outlet baffles of not less than eightsix inches or 100 gallons, whichever is greater, for all liquid
depths with an effluent screen and alarm or for hauid depth of less than 39 inches without an
effluent screen and alarm. The s ... ace between the li 1.uid surface and the to p of the inlet and outlet
........................................................................................................................................................................................................................................ .................................................................................................. ....................................................................... ...............................
baffles must not be I less than eight inches for the liquid depths of 39 inches or more without an
effluent screen and alarm. In addition, there must be at least one inch between the underside of the
top of the tank and the highest point of the inlet and outlet baffles.
13.5 Minimum Tank Capacity.
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For dwellings, there shall be two (2) septic tanks in series with the liquid capacity based on the number of bedrooms
in the dwelling; such tanks shall be as large as the capacities in Table III. The only exception to this requirement is
for the upgrade of an existing compliant system if the primary tank capacity is met and there is no garbage disposal
or sewage pump. System replacement shall require two (2) tanks in series.
Table III — Minimum Septic Tank Capacity
Number of Bedrooms
Tank 1
Tank '2
Two or less
1,000
500
Three
1,000
1,000
Four to Five
1,500
1,000
Six to Seven
2,000
1,000
Eight to Nine
2,500
1,250
Ten or More
Septic tank shall be sized as an MSTS with the second
tank in series being at least 50 percent of the capacity of
the first tank
Multiple Family Dwelling
containing two or more units
Size shall be the sum of the individual dwelling unit
requirements.
13.6 Common tanks.
For s ystems serving ten (10 or fewer dwellings with a common septic tank, the liquid ca pacit y must be determined
b addm the
capacities for each dwelling as determined in this section
............................ g.............................. ................................................................. ............................... ......................................................................................................... ...............................
13.7 Septic .... ..... .. tank capacity for multiple dwellings.
....
For systems serving more than ten (10) dwellings with a common septic tank, the requirements of subpart (1) and
(2) apply
(1 Total septic tank ca pacit y for common tanks serving multiple dwellings under gravity flow to
common tanks is determined by multiplying the flow by 3 0 or W
(2) Total septic tank capacity for common tanks serving multiple dwelling_ s under _pressure flow to
common tanks is determined by multiplying the _design_flow by 4.0,
(3) Total septic tank liquid capacity for systems employing individual tanks at each dwelling
dischar into a collection system must be determined:
(A) By a Minnesota licensed professional engineer; or
(B) ......Accordmg.toahe Prescriptive Designs and Design Guidance Advanced. Designers,
incorporated by reference under part 7080.1550, subpart 2.
1.3.....8 Septic tank capacity for other establishments.
. ................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tank . . . . . . . . . . . . . . . . . . . . . . . . cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . for . . . . . . . . . . . . . . . . other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total septic tank liquid ca pacit y for other establishments with domestic strength waste as defined in Section 2.2
32 is determined b multi m the desi n flow b 3 0 if receivm sewa e under ravit flow b multi 1 m the
(....... ,)a Yy..... p ...y g ......... g.. y g ......... g ......... g... y....... y p y ..g .............
design flow by.4 0 if receiving sewage under pressure flow, or.m.accordance.with Section.13. 13.12 (Prior to. other
treatment devices). Additional design considerations, such as equalization tanks, additional capacity, grease
interceptors, or secondary treatment, are required for influent concentrations that exceed the levels identified in
Section 5 2 (2)(A)
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13.9 Holding Tank Capacity for Other Establishments.
.................
Holding tanks serving Other Establishments must provide storage of at least five times the design flow,
13.10 Effluent Filters Required
An effluent screen with an alarm must be installed on the outlet of the last tank in series.
13.7 13 .. ... l I ........ Tanks ... connected in series
Septic tanks must be connected in series. Each tank or compartment must contain at least 25 percent of the required
total liquid capacity. The first tank must be equal to or larger than any subsequent tank in the series.
13.8 13 12 to other treatment devices
Septic tank liquid capacity prior to other treatment devices must accord with the manufacturer's requirements,
accepted engineering principles, or as identified in the product registration recommended standards and criteria.
13.9 13 Compartmentalization of Single Tanks.
If septic tanks are compartmentalized, items (1) to (5) of this Section apply:
(1) (? ) When septic tanks are divided into compartments, the volume of the first compartment
must be equal to or larger than any succeeding compartments. Each compartment must contain at
least 25 percent of the total required liquid capacity and have an inside horizontal dimension of at
least 24 inches.
(2) ......� --Flow between compartments can be achieved by an unbaffled transfer hole with a
minimum size of 50 square inches located in the clarified liquid zone or a minimum of 12- square
inch transfer hole located above the clarified liquid zone that is baffled according to Section
13.11-.14. The final compartment of a tank that employs a transfer hole in the clarified zone shall
not be used as a pump tank.
(3) (3) - Septic tanks must have at least a two -inch drop between the invert of the inlet to the invert
of the outlet. No liquid level drop is required between two compartments.
(4) ( Adequate venting must be provided between compartments by baffles or by an opening of
at least 12 square inches near the top of the compartment wall.
(5) (5) --- - - -All compartmental walls must be designed to withstand the weight of the effluent against
an empty compartment.
11-1.0 ... ... .. Septic Tank Baffles.
All septic tanks must be baffled according to (1) to (7) of this Section. Effluent screens are allowed to be
substituted for outlet baffles.
(1) (may Baffles must be installed at each inlet and outlet of septic tanks. Outlet baffles are required
on compartment walls if the transfer hole is at the liquid level.
(2) (2) Baffles must be resistant to corrosion or decay. Inlet baffles must not restrict the
movement of solids.
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(3) (3 ) ........................Baffles must be integrally cast with the tank or affixed at the top and bottom with
connectors that are not subject to corrosion or decay. Baffles for fiberglass reinforced polyester
tanks are allowed to be either resin bonded or secured with suitable structural adhesive. Sanitary
tees used as baffles must be affixed to the inlet or outlet pipes with a permanent waterproof
adhesive.
(4) ...... ---The inlet baffle must extend at least six inches, but not more than 20 percent of the total
liquid depth, below the liquid surface and leapt 0 1. ,s. The inlet baffle must extend above the
liquid surface_ in compliance with Section 13.4 (5), and at least one inch I above the crown of the
inlet sewer.
(5) (.5) ........................The outlet baffle and any baffles between compartments must extend below the liquid
surface a distance equal to 40 percent of the liquid depth, except that the penetration of the
indicated baffles or sanitary tees for horizontal cylindrical tanks must be 35 percent of the total
liquid depth. They must also extend above the liquid surface as required in Section 13.10 (4). (5).
(6) (6) ..................There must be at least one inch between the underside of the top of the tank and the highest
point of the inlet and outlet baffles.
(7) (7) The nearest point on the inlet baffles other than sanitary tees must be no less than 6 inches
and no more than 12 inches from the end of the inlet pipe. The nearest point on the outlet baffle,
other than sanitary tees, must not be closer than 6 inches and no more than 12 inches from the
beginning of the outlet pipe of the baffle. Sanitary tees used as inlet or outlet baffles must be at
least 4 inches in diameter.
13.1. 15 ......................... ewne Access.
Septic tanks shall have a minimum of two maintenance holes with a minimum diameter of 20 inches (least dimension).
�
Chi Y�rar1 -ARe anc holeMamtenance.....o..es must e pace . .over e inlet ...baffle an ..e.out et evice a es or screen).
Another The maintenance holeholes must be either .. above .. the... inlet. device ... or near the...ce. nter of the ... tank ...and
fh6litatelarge enough to allow pumping without interference. Enough maintenance holes must be provided so access
can be gained within six feet of all walls for solids removal of each compartment S�x inch ��pecti<,nInspection pipes
of no less than six inches shall be provided over any baffles that uoare not have accessotherwise accessible through_a
maintenance ..=sohole.
13.12 16 Pump Tank Access.
.....
Pump tanks must have a minimum of one maintenance hole with a minimum diameter of 20 inches (least dimension).
Enoug maintenance holes must be p rovided so access can be g ained within six feet of the walls for solids removal.
13.17 Maintenance Hole Risers to Grade.
..
All maintenance hole risers must extend through the tank cover above final grade.
13.13 18 Maintenance Hole Covers E;r .: ai..tcnancc BOWS .:.ust .
1I. Covers for maintenance holes must:
(1) Be secured by being locked, being bolted or screwed, having a weight of at least 95 pounds, or
other methods approved by the Department or local unit of government. Covers shall also be leak
resistant; and be designed so the cover cannot be slid or flipped, which could allow unauthorized
access to the tank.
(2) (2)- - Have a written and graphic label warning of the hazardous conditions inside the tank.
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(3) (3) - Be capable of withstanding a load that the cover is anticipated to receive.
(4) (4) - Be made of a material suitable for outdoor use and resistant to ultraviolet degradation.
.1.3,44 A.-secondary.. r-e-thod. to control unauthorized access... must be provided..
13.15 . .
.. 1319 Concrete Tank Construction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
All precast reinforced concrete sewage tanks must be constructed to meet the requirements of this chapter.
Information on best practices for tank construction is found in the National Precast Concrete Association's best
practices manual, Precast Concrete On -site Wastewater Tanks (2005). This manual is incorporated by reference, is
available through the Minitex interlibrary loan system, and is not subject to frequent change. If a conflict exists
between the manual and this chapter, this chapter applies.
1?:J6 13.....2.0 Non - Concrete Tank Construction.
. . . . . . ............. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
All fiberglass- reinforced polyester and polyethylene tanks must be constructed to meet the requirements of this
chapter. Information on best practices for these tanks is found in the International Association of Plumbing and
Mechanical Officials (IAPMO), Material and Property Standard for Prefabricated Septic Tanks, Standard PS 1 -2006
(2006). This standard is incorporated by reference, is available through the Minitex interlibrary loan system, and is not
subject to frequent change. If conflicts exist between the standard and this chapter, this chapter applies.
13.1?21Precast Reinforced Concrete Tanks.
Precast reinforced concrete tanks must
(1) (1) Have a method to lift the tank for an ultimate load that is four times the working load.;..
(2) (2) - Undergo proper curing to achieve a compressive strength of 4,000 pounds per square inch
before transport, placement, or use and
(3) (3) -Have no pipe penetration points or openings in the exterior walls or tank bottom below the
tank liquid level, unless designed for a specific operational purpose and approved by the
Department �r . a l un g �.ro
vt 1Vl Qi l:ililL V. itVVT.....
13.18 22 Other .Tanks..
Fiberglass- reinforced polyester or polyethylene tanks must be protected against deterioration during storage.
13.11 23Location and installation of tanks:
1 i ,a i,;i.; + +i
- Sewage tanks must not e pY�;e;l ocate. m areas that pre}ti.11'..Y,Y.V unit.. removal o solids
and liquids from the tank according to Section 22.
(2) (2) -- Sewage tanks must be set back as specified in Table V in Section 16.
(3) (3) The top of sewage tanks must not be buried deeper than four feet from final grade for new
dwellings or and not exceed. the tank manufacturer's maximum designed depth for the tank. The
minimum depth of soil cover over the insulation on the top of the tank is six inches.
(4) (T) Sewage tanks must not be placed in floodways, d1LLinugev�aF ways, or swales.
Upslope drainage must be diverted away from the location of all tanks. A tank's final cover must
be crowned or sloped to shed surface water.
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(5) (5) - Sewage tanks must not be placed in areas subject to vehicular traffic unless engineered for
the anticipated load.
(6) (6) ...... --- Sewage tanks must be placed on firm and evenly compacted soil and with the soil level in
all directions. The bottom shall be excavated in a manner so the vertical load is borne by the tank
walls and not the tank bottom. If the bottom of the tank excavation contains rocks, bedding
material must be used according to manufacturer's instructions. The soil beneath the tank must be
capable of bearing the weight of the tank and its contents.
(7) (7) ...... --- Sewage tanks and risers must be installed according to manufacturer's requirements and in
a structurally sound and watertight fashion.
(8) (E) If the top of a sewage tank is to be less than two feet from final grade, the lid of the tank
must be insulated to an R -value of ten. Maintenance hole covers must be insulated to an R -value of
ten. All insulating materials must be resistant to water absorption.
(9) (c) ...... --- Sewage tanks placed below the level of the periodically saturated soil must employ a
method to protect against flotation under periodic saturated soil conditions when the tank is empty.
(10) (10)
Connections between the concrete tank and the building sewer or supply pipe must meet
the requirements of American Society for Testing and Materials, Standard Specification for
Resilient Connectors Between Reinforced Concrete Manhole Structures, Pipes, and Laterals,
ASTM C923 (2002), or equivalent. The standard is incorporated by reference, is available through
the Minitex interlibrary loan system, and is not subject to frequent change.
(11) (11) - Joints of concrete tanks, concrete tank lids, and concrete risers must be sealed using a
bonding compound that meets American Society for Testing and Materials, Standard Specification
for Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint
Sealants, ASTM C990 (2003). The standard is incorporated by reference, is available through the
Minitex interlibrary loan system, and is not subject to frequent change.
13.2€1.....24 Tank Assessment
(1) General
(A) All septicsewage tanks must be µss: ss: d.- watertight, including at all tank and ri ser joints,
riser connections, and pipe connections._
(B An assessment of all models of sewa tanks to be used must be conducted to determine:
I . the structural inte of the tank desi and
ii the adequacy.. of the.. manufacturing process of watertightness..
(C) Sewage tanks, including riser joints, riser connections, and pipe connections must be
designed, manufactured, and installed to be watertight under normal use.
(12)(2) Structural Integrity of Design Test. The structural integrity of each model of tank and all poured -
in accordance with u�esota Rules, Chapter 7090 2010' -place tanks must be verified by
calculation . ... ... . p g
roof testin or a licensed rofessional en ineer to determine the horizontal and
....................................... ............................... i g............................................................................................................................. .......................................................................................................................................... ...............................
vertical loads that the tank can withstand when empty. Tanks must be reverified for structural
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
integrity if the design, materials, or construction methods are modified. A licensed professional
_ _ ... _
engineer shall certify in writing if different manufactured models are similar enough so that the
structural integrity information for one model is valid for other models. Verifications must be
submitted to the commissioner. The commissioner shall maintain and make available the
verifications upon request
69 Washington County Development Code
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13 . T —. . sit 1.o...afl e......'.e +.n r��ax .xn th — U . — ...��.
xw,.�� ...u�� vv .uv.. �.�.vu ... _ vv.�.. u.v �v..v vv...�.
(3) ........................(1) - Watertightness Test
(A) ......At least one tank.per.year,.per modes must be. tested. for watertightness All.poured -in place.
tanks shall be tested for watertightness. Records of testing must be maintained by the
manufacturer for three years and must be available to the commissioner and local unit of
government if requested. Tanks must be tested and meet or exceed the applicable
requirements of subitems (1), (11), or (iii);
1 When empty,..a tank mainta a vacuum of at least inches o f mercury for
five without loss of pressure;
ii. Concrete tanks must water for one hour, without loss, after the tank has been
filled with water to the top of the tank, let stand for 24 hours, and then refilled to the
same level; or _
iii. Fiber reinforced poly ester or polyethy sewa tanks must hold water without
I oss for one after being filled.. _
(B) Sewage tanks that do not pass the listed in item A_must not be used until repaired and
_ _
retested. The repair and retest procedure_must be repeated until the tank _passes the test or
the tank must not be used.
13.25 Tank Identification.
...
(1) Sewage tanks must be marked near the outlet with:
(A) ( ^;.......... — The manufacturer's name.
(B) (B) The model number.
(C) (C).- ... liquid capacity.
(D) (D) The date of manufacture.
(E) (E) - The maximum depth of burial.
(2) (2) ........................The tank manufacturer or manufacturer's agent shall provide the information in Section
132025(1 to the installer in writing.
(3) (3) The tank inlet or outlet must be clearly marked.
(4) (4 ... ... ... . The installer shall submit the information in Section 13 2025 (l) with the as -built drawing.
. 1.. ... ...'.Z.'2 ..............'.saxxa. x.sxsx....:k. xaa. lr.. s•..... axaxx. s •.:k....axa.sxsx +.... +1z..sa... xsx�raxx. %.a-.sarx�... sax.:.. +.s•.....a.aa..... era. larks•......:a.La..�l......a... ...1.. . ... +.n.......:.�1....Ll....'.a. .'.Z..Ll.`:...1aa.r..... ..... r..... L. l........' 2. �1... 1.... a..... ........
N .:.�..:.st..aa.1r...s�.
i�.�.�. vvvvw�v .vKu..v...v..w ... w.w xw..�.v
7 „r �x 1.a.xv +�11R1 x,r; r.t Fa1,. s, I..... ..,�,, +x .r4 .. +�.A.,la 7(1(1G art
Kivu uvvu wiu - riru cuiivu Niivr - cv i vvruui y — - i.v i x xiiuuc 111— - 1— j"11 -11 Lo - vi 1- 11111— L” - xcu 1 Nurc
7080 0130.
T.—I r...s•....£.n..r..... NJ..si�'.'..�'..S..
13.23 13.26 Sewage Tanks for MSTS, General.
......... ......... ......... ......... ......... ............
All holding or treatment tanks or vessels, including lined vessels and grease interceptors serving MSTS, must
conform to the applicable requirements of this Section, except as modified in Section 132 through 132 or
as designed by a professional engineer and approved by the Department or local unit of government.
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13.24 27 ....... MSTS Septic Tank Capacity
Septic tank capacity for MSTS or Other Establishments shall be determined by:
(1) (1) ...... -- -Total septic tank liquid capacity for a common tank serving multiple dwellings under
gravity flow to the common tank is determined by multiplying the design flow by 3.0.
(2) (2) -Total septic tank liquid capacity for a common tank serving multiple dwellings under
pressure flow to the common tank is determined by multiplying the design flow by 4.0.
(3) (3) ...... --- Common multiple septic tanks must be connected in series. Individual tanks connected in
series or any compartment of a tank must have a capacity of more than one -fourth of the required to
total liquid capacity.
(4) (4) - For MSTS that have individual septic tanks at each dwelling, the individual tanks must
meet the requirements of Section 13.5.
(5) ...... -- -Total septic tank liquid capacity prior to other treatment devices shall be according to
manufacturer's requirements or accepted standards.
(6) (.7 Effluent screens(Holdingtanks serving_ Other Establishments_ must_ provide_ storage of at
least I five times the design flow.
(6)(7) An effluent screen or pressure filter must be used on the outlet baffle on th; finulall systems. If
multiple septic tank or pressure fllterstanks are used, the effluent screen must be usedplaced in the
pumplast tank if co. ion ta:Yks are - Y:Ypl�yeA, * series: A ",...0 Y:�ustbe eY:Ypl„y.c o tM -1-
1 'V Ci' VYi LUYY
��. +,, ,nn
eq "YP an be provided with ex YUi YYY Yl Y V VYY Y an alarm Lint filters are recommended if the
sewage contains laundry waste.
(8) 13.25 For c----- septic tanks, theTotal septic tank liquid capacity for systems employing
individual tanks at each dwellin dischar into a collection system must be determined:
. (A) ....... By a Mmne lice nsed ofessi onal eer or
(B) According to the Prescriptive Designs and Design Guidance for Advanced Designers,
incorporated by reference under Section 5.2(4) of this Chapter.
(9) Total septic tank capacity for other establishments with domestic strength waste is determined by
multiplying the desi flow by 3.0 if receivin sewa under gravit flow, by multi plying the
desi flow by 4.0 if receiving the sewage flow under pressure flow or accordin to Section 13.8,
Additional design n considerations such as equalization tanks additional ca acct or seconda
. ........... ......... ........ ......... q ......... p..... yv ....... ....... ... ....D
treatment, are required for influent concentrations that exceed the levels identified in Section
52(2)(A).
13.28 . ....... MSTS Geometry.
T maximum liquid maximu liquid depth of septic tanks to determine liquid capacity must be no greater than 84 inches. The
length -to -width ratio and the length -to -depth ratio must facilitate settling of solids.
1.3. 2h ... na rnmxn�n air +ice + wN �
�
... �
- - o +11P oF � ?n tlao.t a 1*o +xx Pnn ±l 1+ 1 " 1 c»r£arn nncl. +1�P +nn o L ",....,lP +._ aY� l ni tlP +.
vv......v...�vN�.v �w...�.�, �..v .�Nwvv L �w...� w�vvvv.. L 1" 1" .�u.iwvv w..0 ..v vi �..v ....v�
N
11 " , Y ,n+ 1 l 00 +1 c , L l
vuiiYV U rYYU�c 1 vv uu YYwr - c.v vi vvYYC vi - c Yv cvcuY Yv4uYVU 114uiu vuNuvYCy--
13.27 13.30 MSTS Tank Testing.
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All tanks used for MSTS must be tested for watertightness in accordance with Minnesota Rules, Chapter
7080.20 102, Subp. (3). The test shall be conducted to include the watertightness of all connections and risers.
13:?14 " " " " " 3 1 1 MST$ Liners.
............................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Liners used as watertight barriers for treatment devices must be designed and constructed according to liner
requirements developed by the Commissioner of the Minnesota Pollution Control Agency. If conflicts exist
between this Chapter and those requirements, this Chapter applies. Compacted soil liners must not be used as
watertight barriers for treatment devices. Liners must be tested and must hold water without loss for 24 hours after
being filled to the top of the liner.
i �o n .,i „ � +4+ +;„,,.,i P A r r +; , - ,.;i; +., t i.,,+ , + r,,,; +o a
r , or.., r.
F s0+. �axx a oyow... vv..
.... r�.. �. a. Y�. a.. scarx... .�na-...xx.x .....ce.ka....xxs"n.
...o...u..v..w..�.w..v.., ov. vvu - w oyow....v�u.wwu u..uv. ....o v—F-1 ...v uvo.�.. iv. .v.. vvwo
—, 4 +n +},..o Ile »nrtm on +...nr lnnna „r�+ �� nnuPrv,mPn +..n�tPr +�,.o o��P n +,uP �a #P n� +},.x� ( cl ..,ll ;rs� +na1..
ouv....wvu w ...v >L+vNw.....v... v..vvw. u.... vi 5- v v......v..Y
a„ Ix.r +_., -„nl , + <.r ,l. n +kx r.. Try �. ..nn +r al nica �..,,r�x
u.. vz>,cv ..u. 5.11 ... cv.vvN cV , u...v uo vu.vr �.vuov - v V..uv....vuuu.vu uNN.Vvvu - v . y c.I
iJ'li�litiY GY lYii11L'Vl " "YVNYIY "YXYYY[, VlC' "�V VV111YYYVYYL'�
72 Washington County Development Code
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SECTION 14 DISTRIBUTION OF EFFLUENT
14.1 General..
Distribution of effluent for SSTS must meet or exceed the requirements of this Section and Minnesota Rules,
Chapter 7080.2'50'2050
14.2 Supply.Pipes
(1) The supply pipe extending from the septic tank to the undisturbed soil beyond the tank excavation
must meet the strength requirements of American Society for Testing and Materials (ASTM),
Schedule 40 Pipe, contained in Standard Specifications for Poly(Vinyl Chloride)(PVC) Plastic
Pipe, Schedule 40, 80, 120, ASTM D 1785 (2006). The schedule is incorporated by reference, is
available through the Minitex interlibrary loan system, and is not subject to frequent change.
(2) 14.3 — Supply pipes must:
(A) (1) Be made from materials resistant to breakdown from sewage and soil.
(B) (�)........... —Be watertight, including all joints.
(C) (3) Be durable throughout the design life.
(D) (�)........... .. Not deflect, buckle, crush, or longitudinally bend.
(E) (�)......�.. —Be resistant to pressures, fatigue, and strain for the application.
(F) (6) Be installed according to American Society for Testing and Materials, Standard
Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity -
Flow Applications, ASTM D2321 (2005). The standard is incorporated by reference, is
available through the Minitex interlibrary loan system, and is not subject to frequent change.
(G) (7) v Be designed, installed, and protected to minimize the danger of freezing in the
pipe.
(H) (8) . ............................Not be closer than six inches from final grade. Pipes susceptible to freezing shall
be insulated.
(I) (o) Be setback from the water supply wells and water service pipes according to
Minnesota Rules, Chapters 4715 and 4725.
(3) -14A ......... The minimum slope for gravity supply pipes is one percent (' /8 -inch per linear foot). There
is no maximum slope. Pipe restraints must be used for slopes greater than 20 percent or where fluid
velocities in the pipe exceed 15 feet per second. For pressure systems, a minimum slope of one
percent for drainback or other frost protection measures must be employed.
(4) 1.4. c .................A to each supply pipe must be provided for cleanout. The access point must be
accessible from final grade.
14.6 Gravity Distribution
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I
(1) (.1 ; ........................Serial distribution must be used to distribute effluent to individual trenches in a soil
treatment and dispersal system. If the necessary elevation differences between trenches for serial
distribution cannot be achieved by natural topography or by varying the excavation depths, parallel
distribution caninust be used. Serial distribution must not create a pressure head on trenches at
lower elevations.
(2) ...... ---If drop boxes are used for serial distribution, Subitems (A) to (F) apply.
(A) (A) The drop box must be watertight and constructed of durable materials not subject
to corrosion or decay.
(B) (B ) ...........................The invert of the inlet supply pipe must be at least one inch higher than the invert
of the outlet supply pipe to the next drop box.
(C) (C) Thehe invert of the outlet supply pipe to the next drop box must be no greater than
two inches higher than the crown of the distribution pipe serving the trench in which the box
is located.
(D) When sewage tank effluent is delivered to the drop box by a pump, the pump
discharge must be directed against a wall or side of the box on which there is no outlet or
directed against a deflection wall, baffle, or other energy dissipater. The discharge rate into
the drop box must not result in surfacing of sewage from the drop box. The supply pipe
must drain after the pump shuts off.
(E) (E) — —The drop box must be covered by a minimum of six inches of soil. If the top of the
box is deeper than six inches, access must be provided above, at, or within six inches of
finished grade.
(F) (F.) .............. The drop box must be placed on firm and settled soil.
(3) (3) v If valve boxes are used, all requirements in Section 14.5 3(2) apply.
(4) (4) - Distribution boxes must meet the standards in items (A) to (F).
(A) ( ^;.....�.. —The box must be watertight and constructed of durable materials not subject to
corrosion or decay.
(B) (B) - The distribution box must be covered by a minimum of six inches of soil. If the
top of the box is deeper than six inches, access must be provided above, at, or within six
inches of the finished grade.
(C) (C) v The inverts of all outlets must be set and maintained at the same elevation.
(D) (D) The inlet invert must be either at least one inch above the outlet invert or sloped
such that an equivalent elevation above the outlet invert is obtained within the last eight feet
of the inlet pipe.
(E) (E) v Each trench line must be connected separately to the distribution box and must not
be subdivided. Distribution boxes must not be connected to one another if each box has
distribution pipes.
74 Washington County Development Code
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I
(F) (F) When sewage tank effluent is delivered by pump, a baffle wall must be installed in
the distribution box or the pump discharge must be directed against a wall, baffle, side of the
box on which there is no outlet, or directed against a deflection wall, baffle, or other energy
dissipater. The baffle must be secured to the box and extend at least one inch above the
crown of the inlet pipe. The discharge rate into the drop box must not result in surfacing of
sewage from the drop box. Pressure must not build up in the box during pump discharge.
(5) (5) Nonpressurized distribution pipes must meet the requirements of items (!A) to (4}
(l.)b curd - S L i4'.2 -(i) iLxxd Y ° uutiv r 14.2 (,) +.. C-,+;—" 1 /I 2 (G).. .....
(A) ('1 " " " " " " " " " " " "" "' Distribution pipes used for gravity distribution must be at least four inches in
diameter.
(B) Q2 Distribution pipes used for gravity distribution must have at least one row of holes
of no less than one -half inch in diameter spaced no more than 40 inches apart.
(C) ( ......�..� Distribution pipes for gravity distribution must be laid level or on a uniform slope
oriented away from the distribution device of no more than four inches per 100 feet.
ins Tn ;� +r;1,,, +;__ _ ;r.P, 4 . r nr.,.,; +,, a;� +r �, „ +; , ; , PP ,P >,_A� m,, + k—
V-f iii reYYUrYL1a xx F.F1 .Y 'xvx 5."Y V e .jCxx uvL o .11usY vu ¢YxxYxVxlllxy s1 uuccY .1V YYx� ry
r -----
14.74 Pressure Distribution
L71 ArPen..rP 1; tr h„ +;n,, ,,,,, r rrP ,,rP +1,P P„ +;rP 1; r,;1,,, +;ni, �„ rPm ,,, 1 ,,,., r hP „�P 1 £ r•
- x� Y lvouul, - -uuL.V.. - 1 -1 NYVOOUllc;v u.v vY.u.v uluc .vuc.v.. uy ucv... wlu vv uuvu
VI'V ' ' .rYXXYY'FIIY'iY :'5rV✓YYY:Y'.
(B) ........................ grade systems
!Cl A 11 + --,Ph— — A APP , aP I� Aq �PP�rA -,PP .ter; +1, All; --- + A „1P� C'h +Pr_7nQn`_
k' f . YYi GY (%.1'V1.V J'ZYYII. JVG1li,L V VGLYJ 1.1 'iYVC VYC. YYYV'V VV.”. 1YY1.11tV JVLQ YIiY.V S, V✓YtiL1}LVi "Y VlYV
(D) " " .................A11 seepage beds with a. width g're'ater than 1.2 feet
!T 1 11TP,xr..nnn tn.Yr *i�r nr rP �1nrPmPr *...cx stPm rPrPaxri x,n +rPntm PYI +...n
�_I i,VVV VV..oL.uVL.V..V..VN.L.wV...V. .Yo ... o. wV. Y... 5 -,L ati.. V ..L_e..L,
AP +P_;,,PA ;Y, X4; --- t., D-1— 7092 4n3n TT
uvLVYr.....vu .YY.YUlvuvcu Ycu.vu, , vu ✓.TV - ✓v, Yuv.vM
IM All � , +o,�,� .r,1 -o +1,0 Al +,-;1.,, +, _ ,- ,o+.r,,,, -1� ; +.,110,1 .,1.,,.,o +I,- „ .,1 ---A-
V �. .... ... '.. Y i'i'Y"`:Yy ":YY:ri'Y'YY':J "'VW YYii'Y'V "LLYri" . YY': YY: Y' Yll 'L'fiYeYt'Y "i'Yli'Y:'WW'eYt'YY . t . : , 1 . 'YY'Y':YYXxYYoCT' .. YIS'ei' "iYY'Y 'YYYiYY 'Y'iYY;�CYri':
,GEC .1 ... ....................A..1.1....X s1.Q.T. �...
�_I I— _ Y V.
(1) Pressurized distribution pipes must conform to the requirements of SectionSections 14.3 (1) and
... Y C-,+;-- I A Q tQl tC-,+;-" I r. - A 3 (G1._2(2) (A C D and E' ..... .....
• ............................ a........ a...... ............................... .
(-3_(2) Pressure distribution pipes and associated fittings must be properly joined together. The pipe and
connections must be able to withstand a pressure of at least 40 pounds per square inch.
(AP) The distribution network must be designed so there is less than a ten percent variance in flow for all
perforations.
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Table IV — Maximum Number of Perforations Per Lateral
76 Washington County Development Code
1/4 -Inch
Holes
Perforation
Pipe
Diameter (Inches)
Spacing
1
1 1 /4
1 1 /2
2
3
2.0
10
13
18
30
60
2.5
8
12
16
28
54
3.0 1
8
12
16
25
52
7/32 -Inch
Holes
Perforation
Pi e Diameter (Inches)
Spacing
1
1'/4
1'/z
2
3'
2.0
11
16 21
34
68
2.5
10
14 20
32
64
3.0
9
14 19
30
60
3/16 -Inch
Holes
Perforation
Pi
e Diameter Inches)
Spacing
1
1 /4
1 V2
2
3
2.0
12
18
26
46
87
2.5
12
17
24
40
80
3.0
12
16
22
37
75
1/8 -Inch
Holes
Perforation
Pipe
Diameter (Inches)
Spacing
1
1 %4
1 /2
2
3
2.0
21
33
44
74
149
2.5
20
30
41
69
135
3.0
20
29
38
64
128
76 Washington County Development Code
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�11� �tij ..
di st:�� vlat�rls�n�u�b nstall�lel vv 1'��rati;��' c�t�v f�:�c� burrs: ���
( 12) \7N ............ suru= istri €ti nwwlat r lw . 1 c spa Furth th nww3. wwin b s apart fn soap gc = +eds
. ...... ... ............................... ..... .............. ............................... .........................
(13) (Q
pi��t�bpp
(14) ( n) .................... ...............................
a 4e�be
(15) i 10) Tatlzn
4�1i: �gu �; fluggdu e�rt�ismm�lc��u*n��t��si�nrnmmnal bd;+
16 (>>)
x x � x x x x x x� xx xxx xx xx xx xx x x xxx x� xxx x xxx x xxx x �. xx x x x xx x �xx xk x x xx ,
�rinthex�ros� even �istri�uti�n- �v�r�th�b�ti�n -� - 1f- ev�r�l�tributi�n...� -mot
ourngrvalstriutinust:..bepl:
14.8........5 Distribution of Effluent for MSTS.
For MSTS, distribution of effluent into a soil treatment and dispersal area must comply with all parts of Section 14:
14.x' MSTS must, or be designed by a registered professional engineer and approved by the Department - r- lo*eal
14.10 14.6 Pressure Distribution Required for MSTS
MSTS must employ pressure distribution: except as allowed under Section 14.4(10).
14.11 7 MSTS Zones Required
The distribution system for MSTS must be designed to dose and rest zones in accordance with operational
requirements.
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SECTION 15 DOSING OF EFFLUENT
15.1 General..
When pumping or dosing is necessary, it must comply with this Section.
15.2 Pump Tanks
(1) Pump tanks shall meet or exceed the requirements of Section 13.2 Sec*io::S-_or 13.11 h._ugh.
2— All dosing chambers must be vented. Pump tanks shall have a maintenance hole
with a minimum diameter of 20 inches (least dimension) which allows access and removal of any
plumbing or other device. These maintenance holes shall meet or exceed the requirements of
Section 13.1217 and Section 13.1,.18 of this Chapter.
(2) 153 The pump, pump controls, and pump discharge line must be installed to allow access for
servicing or replacement without entering the pump tank.
15.' The pump tank must either include:
{1) I a an alternating two -pump system; or
(2) 1� have a minimum total capacity of:
( ^) 500 gallons for design flowsflow values of 600 gallons per day or less; or
(3) (B) 100 percent of the design flow for design flow values of greater than 600 gallons per day.
( ( MSTE and Other Establ-i -hm�nts rrm�--st 1n Iud alt atir g::t vw pu p syst argil haves a
(5) .1 SSTS with a pump must employ an alarm device to warn of failure.
(6) 15.6 The inlet of pumps must be elevated at least four inches from the bottom of the pump tank
or protected in some other manner to prevent the pump from drawing excessive settled solids.
(7) X5.7 Electrical installations must comply with applicable laws and ordinances including the
most current codes, rules, and regulations of public authorities having jurisdiction and with
Minnesota Rule, Chapter 1315.0200, which incorporates the National Electrical Code.
(8) MSTS and Other Establishments must include an alternating two-pump system and have a
minimums ac of 50 percent of the design flow.
15.8 .........3 Pumps for Gravity Distribution.
If a pump is used to lift effluent into a gravity distribution system, the following apply:
(1) (1) The pump must discharge at least 10 gallons per minute but no more than 45 gallons per
minute.
(2) (2) ..................The pump must be constructed and fitted with sound, durable, and corrosion- resistant
materials.
(3) (3) The pump must have sufficient dynamic head for both the elevation difference and friction
loss.
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Four a Subsurface Sewage Treatment System Regulations
15.9 4 Pumps for Pressure Distribution
Pumps used for pressure distribution must meet the following requirements:
(1) (1) ...... -- -Pumps must be constructed and fitted with sound, durable, and corrosion - resistant
materials.
(2) (2) The pump discharge capacity must be based on the perforation discharges for a minimum
average head of
(A) (ter..... — 1.0 foot for 11 /4 -inch and 3/16 -inch perforations for dwellings;
(B) (B) -2.0 feet for 1/8 -inch perforations for dwellings
(C) (C) - �2.0 feet for 11 /4 -inch and 3/16 -inch perforations for MSTS and other establishments;
and,
(D) (?�; ............. 5.0 feet for 1/8 -inch perforations for MSTS and other establishments.
(3) (3) Perforation discharge is determined by the following formula:
Q = 19.65 cd2hv2
Where: Q = Discharge in Gallons Per Minute (GPM)
c = 0.6- = coefficient of discharge
d = perforation diameter in inches
h = head in feet
15.10 5 ..Pump Discharge Head
The pump discharge head must be at least five feet greater than the head required to overcome pipe friction losses
and the elevation difference between the pump and the distribution device.
15.11 6 .Maximum Dose Volume..
The quantity of effluent delivered for each pump cycle must be no greater than 25 percent of the design flow and at
least fivefour times the volume of the distribution pipes plus orethe volume of the supply pipe.
79 Washington County Development Code
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SECTION 16 TREATMENT AND DISPERSAL
16.1 General..
Treatment and dispersal of all sewage for new construction or replacement SSTS must in compliance with this
Section and Section 17 to Section 21.
162 16.2 General Technical Requirements for All Systems.
All new construction or replacement SSTS must be designed to meet or exceed the following provisions:
(1) (?) - - - -- -All treatment and dispersal methods must be designed to conform to all applicable federal,
state, and local regulations.
(2) (2) Treatment and dispersal processes must prevent sewage or sewage effluent contact with
humans, insects, or vermin.
(3) (3) Treatment and dispersal of sewage or sewage effluent must be in a safe manner that
adequately protects from physical injury or harm.
(4) (4 An unsaturated zone in the soil must be maintained between the bottom of the soil
treatment and dispersal system and the periodically saturated soil or bedrock during loading of
effluent.
(5) (5) ........................Soil treatment and dispersal systems must not be designed in floodways. Soil treatment
and dispersal systems installed in flood fringes must meet the requirements of Section 18.32. All
soil treatment systems located in areas subject to excessive run -on must have a diversion
constructed upslope from the system.
(6) (UK
) ... ... ... ... ... SSTS components must be setback in accordance with Table V.
(7) (7) No component of an SSTS is allowed to be located under or within the structure or other
impermeable surface.
(8) (Q) Flow measurement must be employed for all single family dwellings and other
establishments with a pump tank, all single family dwellings with a Type III, IV, V systems, and all
multi - family dwellings.
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Table V — Minimum Setback Distances Feet
Feature
Sewage Tank
Soil Treatment and
Dispersal Area
Water supply wells less than 50 feet deep and not
encountering at least 10 feet of impervious material
50
100
Any other water supply well or buried suction pipe
50
50
Buried pipe distributing water under pressure
10
10
Occupied buildings and buildings with basements or
crawl spaces
10*
20
Non - occupied structures, deck post footings
5*
10
Property lines
10
10
Above ground and in- ground swimming pools
10*
10
The Ordinary High Water ''x 1 Leve1(OHWLof:
Natural Environment Lakes -aiYd StreaY�s
150*
150
Recreational Development Lakes and Streams
75*
75
General Development Lakes and Strew::: -s
75*
75
All , ,.i_, 47_A . , +o
7c
7c
Transition Rivers /Streams
150*
150
Tnbutary Rivers /Streams
150*
150
Other. Perennial Surface Water FeaturesWetlandEdge
50*
20 *
50
20
St. Croix River -Rural Districts
150*
150
St. Croix River -Urban Districts
100*
100
Blufflines:
St. Croix River Blufflines
40*
40
Shoreland Blufflines
20*
20
*On reyiousl develo ed sates tanks can be replaced in the same location as lon as the are not closer to the
......... Y..... p ......._ ......... ......... p......... ............... Y........
feature back,from
16.3 Other Technical Requirements for Systems.
The following items are required for specific designs as determined in Section 17 to Section 21.
(1) V- 0 . ... ... ... ... ... 'Employ components registered under Minnesota Rules 7083.4070 and 7083.4080 that are
installed, used and operated according to the conditions placed on the registration.
(2) (2) EmployceEmploy structural components and joint sealants that meet or exceed the
system's expected design life.
(3) (3) " " " " " " " " "" "'For acceptable treatment of septic tank effluent by soil, the soil treatment and dispersal
systems must meet the following requirements:
81 Washington County Development Code
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Four a Subsurface Sewage Treatment System Regulations
I
(A) (,; A minimum three -foot vertical soil treatment and dispersal zone - al -Imust be
designed below the distribution media that meets the following criteria:
i. The zone must be above the periodically saturated soil and bedrock. The zone must
be continuous and not be interrupted by seasonal zones of saturation.
(r) ... ... ... ... The.. zone. rnust.be.. above ..the perrodi cal Iy saturated -soil and bedrock: The ..zone
r a — is.. and. x.. #. lasx.. a.. xak�.. x- r ...xaatsarl..liar...rsx.arnx.+.
...0 u LL...1 "Ot w ... w.. uF— -
l;; I A „xr_� ;l l�x,P, .xr; +h +P, +,,, a, .,£ 1 ;,, Tnh1P TV ;„ 71 ii t ?, 1Ps Ch ap t er �.. j _ Y xYYy....oV1Y iuy vYO vv 1 u Lv LUly 6—F yr - - 1 111 iuvly iz i...... ..il..11vuvcu...iculvu�._—"-F—
�nQn � 1 cn +,,,,+ ho ,.,•o,a; +o,a ., ,,.,,+ „� +ho „ ,zr +h,•oo_F „+ ,
' .11 LY.T L "11VL Ll'v "VI VlY. L'ii'CC "LLJ rli1:Y L'Vl LYYV'YY�V ei�i �T�aYy iLYYYVV 1'xi`[lti'L.ViYV'
Y VVV.LY JV
ii. (iii; ................ Any soil _lavers that are any of the United Stated Department of
Agriculture (USDA) soil textures classified as sand with 35 to 50 percent rock
fragments must be credited at only one -half their thickness as part of the necessary
treatment zone. Soil lavers re of soil texture with g reater than 50 percent
rock fragments must as of the necessary treatment zone Layers
that are given full, partial, or no credit must, in any layering arrangement in the soil
profile, be cumulatively added to determine the amount of soil treatment zone in
accordance with other soil treatment zone provisions.
-Al ........ The entire treatment zone depth must be within seven feet from final grade.
(B) (B)......�.. -The distribution system or media must not place a hydraulic head greater than 30
inches above the bottom of the absorption area.
(4) (4) The system's absorption area must be in original soil.
(5) (5) - The system's absorption area and mound absorption ratio must be sized according to the
Table IY VI Loading Rate for Determining Bottom Absorption Area �T,,. TreYi� I s —A Stiepage
Beds for Ef fluent Treat ommi..�vo- t:c:::and Absorption Ratios for Determining. Mound Absorption Areas
Using Detailed Soil Descriptions -as f0�ax:d .J :J;nne —f Rules, �haNt .. ?q .? l s0 or by using
Table VIVIa if not using detailed soil descriptions. Soils with a loading rate less than 0.45 gallons
per day per square foot cannot be used in a Type I or Type II system for new construction.
Table VI
ec
Loading Rates for Determining Bottom Absorption Area fir I r�nel and Spag� Beds far a��
Tr.n rx +m saxx,k T .nx gal fvr Tl ak,¢,rrn xx ntx a�l�.xx. xrx rl Ah a:.rxrxxkr n.n
1. �L111.11L eve! and Ab sorption Ratios �.. L ........... ..�xl,.11� .,., x11 N L1x111. seas ns.: g pereolatr�n
TestsUsin2 Detailed Soil Descriptions *.
82 Washington County Development Code
Treatment Level
Treatment Level C
Treatme nt Levels
Treatment I evels A'
C
A
USDA Soil Texture
Soil Structure and
' ., x�.t.G = .A'
Mound Absorption
SionAbsorptlon
Mound Absorption'
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Four a Subsurface Sewage Treatment System Regulations
* coo co,. + ;,>„ I Q 7 � r _ -, +- -41, +],;� + -- ���;� i'P -- rr D -;al=, no,,,,o kl- c - ;]� C- +o>Y,�� *O
' I -e l VLYViY i0':- 1VY "L . Y SLG- V4Y LYi t.. Ly F� V1 SViY � V i �) V ii YIQ JYVYiy i'V 1YYY'V ii IIVYYJ Li}'JLGYYYJ�
includes soil horizons with <50% rock fragments, with very iable and friable consistence and loose non - cemented
.......................................................................................................................................................... ............................... �' ............................................................................................................................................., .................................................................................... ...............................
sands. Soil horizons with >50% rock fragments must not come in contact with soil dispersal system media.
"Conduct percolation test and size_under Table VIa. May_ need to be designed as a Ty_ _pe III System under Section
19 of this Chapter.
* * * Assume a hydraulic loading rate to the sand at 1.6 gp /ft
83 Washington County Development Code
Grade
bsorptian Area
Ratio
Area Loading Rate
Ratio
Loadnng Rate
(gpdtft')
04=N"::' -- D -x '..
rcpolft)
Sand, coarse sand
loamy sand, loamy
Single grain,.
coarse sand fine sand,
very fine sand, loamy
granular, blocky, or
1.0
fine sand loamy very
prismatic structure.;
Weak grade
fine sand, 35 -50 %o rock
fragments
Sand, coarse sand,
Single grain,
loamy sand loamv
granular, blockv, or,
1
1 ......5 *
1.206
1.0
coarse sand,-<3 5 % rock
prismatic structure;
fragments
weak grade
0...a....... S..
Te` tea rr -uN
Single grain,
3)Fine_sand, very fine
granular, blocky, or
0.6
2._0
1.0
1.6
sand, loamy fine sand
prismatic structure,
loamy very fine sand,
weak grade
>35% rock fragments
6 15Sand_y loam
Granular, blocky, or
coarse sandy loam, fine
prismatic structure,
0.78
1.35
1.0
1.6
sandy very fine
weak to strong grade
sandy loam
Sandy loam, coarse
sandy loam finesandy
Platywrth weak
loam, very fine sandy
grade or massive
0.6$
1,_8
0.87
1.8
Granular, blocky, or
16 30Loam
prismatic structure,
... ... ..
0.6
2.0
0.78
2.1
weak to strong_grade
31 - 4 5Loam
Platy, with weak
0.552
2.3
0.68
2.4
g rade or massive
Granular, blocky, or
46 60Siltloam,.silt
prismatic structure;
0.4-55
2.64
0.78
2.1
weak to strong _grade
>60* *Silt loam, silt
Platy with weak
0.2 -�,42
2.9
5:0.65
2.5
grade or massive
Granular, blocky, or
Clay loam, sandy clay
prismatic structure,
loam, silty clay loam
moderate to strong
0,45
2,
0 6
2 7
grade
Clay, sandy clay,_ silty
I I
-
-
clay
�
_
.....
....
.....
* coo co,. + ;,>„ I Q 7 � r _ -, +- -41, +],;� + -- ���;� i'P -- rr D -;al=, no,,,,o kl- c - ;]� C- +o>Y,�� *O
' I -e l VLYViY i0':- 1VY "L . Y SLG- V4Y LYi t.. Ly F� V1 SViY � V i �) V ii YIQ JYVYiy i'V 1YYY'V ii IIVYYJ Li}'JLGYYYJ�
includes soil horizons with <50% rock fragments, with very iable and friable consistence and loose non - cemented
.......................................................................................................................................................... ............................... �' ............................................................................................................................................., .................................................................................... ...............................
sands. Soil horizons with >50% rock fragments must not come in contact with soil dispersal system media.
"Conduct percolation test and size_under Table VIa. May_ need to be designed as a Ty_ _pe III System under Section
19 of this Chapter.
* * * Assume a hydraulic loading rate to the sand at 1.6 gp /ft
83 Washington County Development Code
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Table VIA
Loading Rates for Determining Bottom Absorption Area and Absorption Ratios using Percolation Tests
* * Soil with too high a percentage of clay for installation of a Type I, or Type II system.
Systems in soils with this Percolation Rate must be a Type III, Type IV or Type V system.
(6) (6) ........................If drainfield rock medium is employed, a durable, nonwoven geotextile fabric must be used
to cover the distribution rock medium. The fabric must be of sufficient strength to undergo
installation without rupture. The fabric must permit passage of water without passage of overlying
soil material into the rock medium.
(7) (7) ..................All excavation into the absorption area, or surface preparation of the upper 12 inches of the
absorption area, must be in a manner to expose the original soil structure in an unsmeared and
uncompacted condition. Excavation is only allowed when the soil moisture content is at or less
than the plastic limit and is not frozen or freezing.
(8) (Q) - Excavation equipment or other vehicles must not be driven on the excavated or prepared
absorption area. Foot traffic on these areas must be minimized and not cause compaction. The
exposed areas must be immediately covered with the media or designed coverage materials. If the
areas are exposed to direct rainfall, they must be allowed to dry and must be re- prepared according
to Section 1617.3 (7(3)(J).
(9) (9) ... ... ... . ... A minimum of six inches of topsoil borrow shall be placed over the system.
(10) i 1 . 0) -A close - growing, vigorous vegetative cover must be established over the soil treatment and
dispersal system and other vegetatively disturbed areas. The sodding, seeding, or vegetation
establishment shall begin immediately after the placement of the topsoil borrow. Thelf the climatic
season does not allow immediate establishment of vegetation, the soil treatment and dispersal
.............................i...........................................................
system must be protected from erosion and excessive frost untiland a vegetative cover ismust.be
established as soon as favorable climatic conditions exist. The vegetative cover established must
not interfere with the hydraulic performance of the system and shall provide adequate frost and
erosion protection. Trees, shrubs, deep- rooted plants, or hydrophytic plants must not be planted on
the system.
84 Washington County Development Code
Treatment Level C
Treatment Level C
Treatment Levels A
Treatment Levels A,
Percolation Rate
Absorption Area
.
Mound Abst?mtion
A-2, B, and .B.
A and B..2
(Minutes Per Inch)
Loading Rate.
Ratio
Absorption Area
Mound Absorption
( dlftZ)
LOadin Rate ( ...cllft�)
Ratio
<0.1
-
1.0
-
1.0
0.1 to 5
1.2
1.0
1.6
1.0
0.1 to 5 (fine sand
0.6
2.0
1.0
1.6
and loamy_ fine sand)
6 to 15
0.78
1.5
1.0
1.6
16 to 30
0.6
2.0
0.78
2.0
31 to 45
0.5
2.4
0.78
2.0
46 to 60
0.45
2.6
0.6
2.6
>60*
-
-
-
-
* * Soil with too high a percentage of clay for installation of a Type I, or Type II system.
Systems in soils with this Percolation Rate must be a Type III, Type IV or Type V system.
(6) (6) ........................If drainfield rock medium is employed, a durable, nonwoven geotextile fabric must be used
to cover the distribution rock medium. The fabric must be of sufficient strength to undergo
installation without rupture. The fabric must permit passage of water without passage of overlying
soil material into the rock medium.
(7) (7) ..................All excavation into the absorption area, or surface preparation of the upper 12 inches of the
absorption area, must be in a manner to expose the original soil structure in an unsmeared and
uncompacted condition. Excavation is only allowed when the soil moisture content is at or less
than the plastic limit and is not frozen or freezing.
(8) (Q) - Excavation equipment or other vehicles must not be driven on the excavated or prepared
absorption area. Foot traffic on these areas must be minimized and not cause compaction. The
exposed areas must be immediately covered with the media or designed coverage materials. If the
areas are exposed to direct rainfall, they must be allowed to dry and must be re- prepared according
to Section 1617.3 (7(3)(J).
(9) (9) ... ... ... . ... A minimum of six inches of topsoil borrow shall be placed over the system.
(10) i 1 . 0) -A close - growing, vigorous vegetative cover must be established over the soil treatment and
dispersal system and other vegetatively disturbed areas. The sodding, seeding, or vegetation
establishment shall begin immediately after the placement of the topsoil borrow. Thelf the climatic
season does not allow immediate establishment of vegetation, the soil treatment and dispersal
.............................i...........................................................
system must be protected from erosion and excessive frost untiland a vegetative cover ismust.be
established as soon as favorable climatic conditions exist. The vegetative cover established must
not interfere with the hydraulic performance of the system and shall provide adequate frost and
erosion protection. Trees, shrubs, deep- rooted plants, or hydrophytic plants must not be planted on
the system.
84 Washington County Development Code
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(11) ........... Sewage tank effluent concentrations to the soil dispersal system must not exceed a_BOD
concentration of 170_mg /L, a CBOD concentration of 125mg /L, a TSS concentration of 60 mg /L,
or an oil and g rease concentration of 25 m /L.
(12 The distribution media must not be in contact with soils that have any sand soil texture containin
50 percent or.more.rock. fragments any.soils. that have a percolation rate less 0 minutes.
per inch.
(13) The contour loading rate for soil dispersal systems must be between 1 and 12 gallons per lineal foot
per da y _ _ _ _
16.4 Nitrogen M
BP.
At a minimum, systems designed under this Chapter with a design flow of greater than 2,500 gallons per day, which
impact water quality of an aquifer, as defined in Minnesota Rules, Chapter 4725.0 100, subpart 21, must employ
best management practices for nitrogen reduction developed by the Commissioner to mitigate water quality impacts
to groundwater.
16.5 Final treatment and dispersal for MSTS shall meet the following. requirements:
(1) ( ......� Gen....:... .eral.__Final treatment and dispersal must be according to applicable design
........
requirements of this Chapter, except as modified in this Section. Code of Federal Regulations, Title
40, Parts 144 and 146, prescribe additional design regulations applicable to certain systems. At a
minimum, flow amounts to be used for the purpose of this Section must be derived from Table I or
II in Section 12 of this Chapter.
(2) ......� Setbacks MSTS must meet all setbacks in Table V.
(3) (3) Minimal Soil and Site Conditions. ..... The site proposed to support the soil treatment and
dispersal system must:
(A) (A) ............. Have the upper 18 inches of the absorption area:
(i)Be original soil.,
Have a soil loading rate of greater than zero as listed in Table Ly i1
Minnesota Rulcs Chapter 70 50"V or Table VIVIa, in Section 16.3..
Be above the periodically saturated soil or bedrock.;
!pl 1\J0 _ +h— �;_o o ,,,; oY o +� ; , C—,+;__ 14, ; t ;S . 1 Co +ham lr� ;, rnkl— IT
k_1 Aleev 11YV LLY " SILV '1Gl1LiY1 V1YYVYi L.T 111 C5V{ WII Y .-' ,Y LL M LI Lu"CK3 ... . GW
(B) (C) ............. Not be a wetland or floodway ;
(C) (D) v Not be in an area in which surface runoff from precipitation will concentrate
(concave hillslope).), and
(D) (F) . ..........................All the system to be placed on contour.
(4) (4) - Inspection Pipes. a Inspection pipes must be located to adequately assess the hydraulic
performance of the entire soil dispersal system.
(5) .........( Soil Absorption Area Siz>ng
85 Washington County Development Code
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(A) Effluent loading rates to the soil shall be no greater than loading rates prescribed in:
t n l T�h� !X ;„ M ,- +, u-1— ("---+-r 7080 21 sn'Table VI or Table
\�>j iuv><v iz>, i>< ivicccl vJVLU xcu><v J, c:iiuN LV>< > vov.c.i�v ,
VIVIa in Section 16.3, if the absorption area receives treatment level C effluent as
d�fl:reddescribed in Minnesota Rules 7083.4030.
n
() ........ ,r awl'r'LI n 11 Tx1+1.Pn a +� l.a fan .kiapt�r..n�n 73Sn ...vx T'$ .4P +xnl+ `! 4...f.tk
n' A „1P�..
uvuvrNc Vii u><vu ><vvv><vvJ Lvuc 11v1L ><v vvr s, Vi L vii><uv><L iii
F"
7083.4030. ivi><ix><><vuV LU xcu><v J
ii. (C)......- Section 21.
(5)(6) If the absorption area receives effluent not as described in Section 16.5 (5)(A), the
absorption area shall be increased by 50 percent of the amount derived in Section 1.5 (5) .),Table
VI or Vla, and zoned for dosing and resting.
(6 )(7) (7) ... ... ... ... ..System Geometry, Lawn Area Sizin, Groundwater Mounding. The system
geometry and lawn area sizing shall be sized to prevent groundwater mounding from violating the
unsaturated zone beneath the soil system according to Section 16.5 (89) for proper hydraulic
functioning, and for concentration reduction of nitrogen and phosphorus, if applicable.
i'” 8 i - Reserve Land Area.. Additional set -aside land area of 100 percent of the size determined
r ....... .. � "r
in Section 16.5 (5) to 16..5(7) is required for systems whose absorption area receives effluent
meeting treatment level A or B in part Minnesota Rules, 7083.4030 or designed in accordance with
Section 21. Additional land area of 50 percent of the size determined in Section 16.5 (5) to 16.5(7)
is required for systems whose absorption area receives treatment level C in part Minnesota Rules,
7083.4030. The reserve land area must be identified and protected for future use if necessary.
Replacement MSTS proposed on sites that cannot meet this requirement are allowed to be
exempted by the Department or local unit of government.
(8)(9) m (9) v Soil Treatment Zone. For treatment of effluent by soil to meet the performance criteria in
Section 4.98 (3) of this Chapter, the soil treatment and dispersal systems must meet the
requirements below:
(A) ( ^; - -For soil treatment and dispersal systems that receive treatment level A-2-13-2-or C
effluent as described in Minnesota Rules, 7083.4030, the soil treatment zone requirements
must meet or exceed the requ mments of Section 16.3 (3). The required three -foot vertical
separation must be maintained during operation after accounting for groundwater mounding.
(B) (B) .............. For soil treatment and dispersal systems that receive treatment level A or B effluent
as described in Minnesota Rules, 7083.4030, the soil treatment zone _requirements must meet
or exceed the requirements: of Section 16.3 (3), unless modified in Table VI in
Section 16.3 (5), with a minimum vertical separation of two feet. The required vertical
se aration must be mamtamed dunn o eration after accountm for roundwater moundm .
p ........................................................................................................................ ............................... g......... p........................................................................ ............................... 1................ g................................................................ ............................... g....
(1)........... A M. - Inimum..ver de -p of the soil tr atm l nt anal. -dispersal zon below t l
dist 4n i but1(1n raedi!?._(J1 ,1� _Y?.P fAP+ P.] YA1'?EMP/'1....�)!�(�/TYIY}]YLR +/T T�11"�AP .II....R. llt 1nPC +1111'1 71...1 lEi ? +AA....�1.
WxJLxx1 WLx. xx xxx. WxW _. -I VV W�L�xxxxxxx.,W WVV din L., I — ... S VVLion 2.,, vvxLxx W
? Y1is co .sh-11 ?A ?..A +'A 1R....�
v vur Vi - cvvV ivvc. i><><><s cV><><v oi><u><><><r1vvL L><><v V><><V VV
86 Washington County Development Code
Effective Septembe. r.... 2. 3. 3 .... 20 09 ................................................................ .....................lMonthl.f. Day).,.. fYearl ............ ........................Chapter
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Four a Subsurface Sewage Treatment System Regulations
1.
A--;I 1_n,rnrn —41, n +— +— n- rn,,, -, .,£ 1 Tnl In TV ;" T%J;— -,nn +n D-1— YU:'NYJ vv'1L11 Yl "Y:iJlii UY V' "5.ii PT" Y 1 111 "'l U. V''- YYY Y'Y]IYYI..' OVLU Y'LUYiL'.7
(l n +or '7n4n 71 cn' n+ �+ I— ---A —A n nrr nP +l,o
n nnn
Zane.:
h , . -IFL .�,..n +. ul ,a. +T ., n� v 1 1 L
Y vile lvc vui1r1v11L -.1 uvlicYl llluucvv vv1uY111 ov vvYl Yvv L YY Vlll YYYlul �luuv
�lY� itYV'iL1Jil YlitiYLlVYt 5�".'i Liilll "vr 111iiiAYU i11 UST 1: "Yii}L �iYUC�i� U YY3"IAlUU11iJ "iliiUU "�Yi�IX.Lii Y' "L11U.11 ✓lY
nl,on nl.n.ro +l 0 1 n++n. n� +L o nl nnry +.nr n
.r on
iYiiiYYli:i "LLV V'Y''ii "YYYii' Vii Y:LVY'Y Y"' V I" Y:iYii "YV:iiiY'�'i GY V YY' Y;Y.Y'ii Y'Y
�1Vr "' lYYV' ". ClLYYYJ UV.7VY�LYiiYl' "UY Ii YI "YYYICI[.Yi VV " ":9YL.ii lr "UiJiJiil iYYYY�' "Lii LiVGL1iiYY lll'.,J' �J j':
( . ... ... ... ... ...
(C) The minimum vertical separation can be determined by the method described in Section
21.1(3) to meet provisions of Section 4.98 (3).
(D) An observation well to measure the height of the periodically saturated soil beneath
the operating system must be installed and monitored according to the operating permit.
x)(10) (l O) " "— Nitrogen Reduct>on, MSTS systems must employ nitrogen mitigation methods to achieve
compliance with Section 4.98 (4), and must be monitored in accordance with Section 11.4 of this
Chapter.
10(U _._....r1 I) -' -' Phosphorus Reduction... Phosphorus mitigation methods must be employed to
achieve compliance with Section 4.98 (5), if natural processes are found inadequate.
(a 1)(12) (12) 11 Design Report. All information required in this Section shall be submitted for
review and approval by the Department or laical unit —f govemment prior to system construction,
including all applicable information delineated on a map.
16.6 Collection Systems.
The collection system for the collection of sewage from multiple buildings or multiple other establishments
dischar into an MSTS must be desi gned:
(1 According to the Prescriptive Designs and Design Guidance for Advanced Desi incorporated
by reference. under.S.ectlon..5 2(4),..or
(2) By a Minnesota licensed professional engineer.
16.7 Construction Requirements.
MSTS construction must be according to applicable construction requirements of this Chapter.
16'.'- 16 8 MSTS Design Standards.
The design standards for new construction or replacement MSTS are provided to meet many of the public health and
environmental outcomes in Section 4. In some cases, specific design methods must be employed in addition to the
standards provided in this Chapter.
16'.8 " "" "'16.9 Prohibited ge
Dischars.
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MSTS must not receive storm water or other sources of clean water.
1610 Component
All structural components of the system and sealants must be designed to operate throughout the system's design life.
1-6.10 16 11 .Flow Measurement Device.
A flow measure device must be employed on all MSTS.
16.11 12 System Access.
The system must be designed with sufficient access and ports to monitor the system as applicable.
16.12 16.13 Registered Products.
MSTS must employ components registered under parts 7083.4000 to 7083.4110 or have sufficient regulatory
oversight in the operating permit.
16.13 16.14 Designer Inspections.
The MSTS designer must observe critical periods of the system construction. The designer shall prepare a report of
observed construction activities and submit the report to the Department o*r lo' aa unit �f g� er::mcnt prior to the
final inspection.
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SECTION 17 TYPE I SYSTEMS
17.1 Type
Systems designed according to this Section are considered Type I Systems., as _defined in Section 22 (132).
Systems in soils with a loading rate less than 0.45 gallons per day per square foot cane tmust not be used in a Type
I system for new construction.
17.2 Trenches and Seepage Beds
(1) (I) - Characteristics.... To qualify as a trench or seepage bed system, the system must meet or
exceed the following requirements:
(A) (A) - Employ flow values in Section 12.
(B) (R) - Meet or exceed applicable technical requirements of Section 13, Section 14, and
Section 15.
(C) - -Meet or exceed the requirements of Sections 16.2 and 16.3.
lTll ] 7 1 MP+ +
P 1,P ,P ,,,;,P,,,P t� Of cP� +; »,_ !21 17 ? !] +, cP� +; ,,, 51
VC 1va1u11 VlllvllLJ VY VVV LiV1r - Y >.L �L� LV vvvL1V11 r - >.L �Y ✓Jr
(2) (2) ......� General.. Seepage bed placement must be limited to areas having natural slopes of less
than six (6) percent. Absorption areas for seepage beds must not be placed in soils with a texture
5- - F_load* rate of .8..Mn. less than 0.45 gallons per day per square foot or as shown in Table xu -.in
F-- VI or Via. Seepage beds must not be located in floodplains.
11 JVLLL I<4L1VJ 111111. LVl 1VVV. L 1✓
(3) .........( Sizing of Trenches
(A) The trench bottom absorption area is calculated by dividing the design flow by the
appropriate soil loading rate in Table IlX in Minnesota I.ules Chapter 7080 2150'VI or
Table VIVIa.
(B) fA) - If gravity distribution is used in seepage beds, the seepage bed absorption area is
calculated by dividing the design flow by the soil loading rate and then multiplying that
value by 1.5.
(C) (5) --- - - - -If pressure distribution is used in seepage beds, the seepage bed absorption area is
determined by dividing the design flow by the soil loading rate in Table uY in M.;n nesota
n„]os Ch. ter 7nsn 2 ] cn'VI or Table V1VIa.
1lLLiV J, "iii1LI.1JLV1 1VVV:L1 ✓V _.
(D) (6) . .............. The minimum sidewall absorption is six (6) inches. The bottom absorption area is
allowed to be reduced, for gravity distribution trenches only, by the following:
Sidewall
Absorption-
Sizing
Inches
Equivalent
8-11,
7%
12-17
20%
18 -23
34%
24
40%
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..(.7) ....................A 40 percent reduction is not allowed with a_loading_ _rate of _1.2 gallons per day_per
square foot.
4) ......................... Desi. ..n...an.d...Construct on. ..of..Trenches..an.d...See.PA.g ..Beds
Trenches must be no more than 36 inches wide. Any excavation wider than 36 inches shall be
I.._ dis a seepage bed.
O A seepage bed must not be wider than 12 feet if gravity distribution is used.
(9) � se�pag� bed t ��* be v x��x..th— and 25 feet if pressure distribution is used.
(x0,----- ._.Natural, undisturbed soil must exist between multiple trenches and seepage beds.
(A) (11) - Multiple seepage beds must be spaced at one -half the bed width.:lultiPlc unita
xxxu�x, - uv i.ry �Y�xxvu uax:�ui.x ariY UY xvLr.uxxx� iuLVO - Lx� ua��cixv�c.x - xxi .�uvx:x�rix cJ.c:- '��'i'/ txl[Y'Cx
Qo +;o 17 (9)
(B) ( .. .. A vertical inspection pipe at least four inches in diameter must be installed and
secured in the distribution medium of every trench and seepage bed. The inspection pipe
must be located at an end opposite from where the sewage tank effluent enters the medium.
The inspection pipe must have three - eighths inch or larger perforations spaced vertically no
more than six inches apart. At least two perforations must be located in the distribution
medium. Perforations must not be located above the geotextile cover or wrap. The
inspection pipe must extend to the bottom of the distribution medium, be secured, and be
capped flush with or above finished grade.
(C) (l3) The top and bottom of the distribution medium must be level along the contour.
Sidewalls must be as vertical as practical and not intentionally sloped.
(D) (a 1 ) The minimum depth of soil cover, including topsoil borrow, over the distribution
medium is 12 inches.
(E) ( 5) Trenches or seepage beds must be backfilled and crowned above finished grade to
allow for settling. The top six inches of the backfill must have the same texture as the
adjacent soil.
(F) Trenches and seepage beds in which the distribution media is in contact with soils that are
sand, loam sand, fine sand, or loamy fine sand or soils with a percolation rate of 0.1 to 5
minutes per inch must em one or more of the following measures:
1 ...... dist but d
Employ pressure riion accormg to Sect 14 4
. io
.......
ii. Divide the total dispersal area into multiple units that employ .... rial stribution, with
each dispersal unit having no greater than 15 _percent of the required bottom
absorption area,
iii. Have a vertical separation distance of at least five feet.
17.3 Mounds
(1) (1) Mound System Requirements To qualify as a mound system, the system must meet or
.. .........
exceed the following requirements:
(A) I A Employ flow values in Section 12.
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I
(B) (B) - Meet or exceed applicable technical requirements of Section 13, Section 14, and
Section 15.
(C) (C) ... ... . ... ... ... Meet or exceed the requirements of Sections 16.2 and 16.3.
ir» .. naPP + +I P YP r,Pr +�Pr +;�,
/ iTlvvc oily 1va1U11eme.— of
vvv LiVlr - 1 > .✓ �c� LV vvvL1V11 r - > .✓ �✓vJr
(2) Location of Mounds
(A) (2 . ............................The upper 18 inches of the original soil mound absorption area must have a
minimum loading rate of 0.45 gallons per day per square foot and a mound absorption ratio
greater than zero, but no more than 2.6 in Table Lu in _Ikl n; iota 1�u1 s Chapter
Insn ' I J cn VI or Table VIVIa. The upper 18 inches of the absorption area must also be
YVl1V .L1V
above the periodically saturated soil or bedrock.
(B) 4. . ...... ... ..... For previously developed sites, the upper 12 inches of the original soil mound
absorption area must have a mound absorption ratio of greater than zero in Table L v in
M11111V JV +, u„ 1 — Ch —+ 7090 11 n' VIor Table VIVIa. The upper 12 inches of the
LLL.1 -1V T✓11U LVl fVV - -1✓V Vl__ __ _ __
absorption area must also be above the periodically saturated soil or bedrock.
(C) (4) ...... .......................Setbacks must be according to Table V. Setbacks must be measured from the
original soil absorption area.
(D) (5) On slopes of one percent or greater and where the original soil mound absorption
ratio is 2.6 or greater in Table Ly i t AIt; -nes: to I?;�les, Chapter ?080.215VI or Table VIV
Ia,
.........
mounds must not be located where the ground surface contour lines that lie directly below
the long axis of the distribution media bed represent a swale or draw, unless the contour
lines have a radius of curvature greater than 100 feet.x
(E) (6) Mounds must never be located in swales or draws where the radius of curvature of
the contour lines is less than 50 feet.
(F) In no case shall mounds be placed on slopes ,greater than 12 percent.
(3) Mound Design and Construction
(A) (?) .....................The mound distribution media bed area consists of bottom area only and must be
calculated by dividing the design flow by 1.0 gallons per square foot per day.
(B) (8) The' ::oulid'di ^butloli l:edia bvd urea mint be au ivig tLad "liarrovv' a� practical:
Mound distribution media beds bed width is determined accordin to Section 16.3 (13 and
must be no wider than ten feet.
(9) .......Moun distribution bed.le width must be determined by the conto loading - rate. which. - is
V 11V1X.- the YP 1_�1 +�(T.1'�b!It.I Y! 4"TP +Sd3PP1'� +1?P TIP Yet C!lA �l A?fA...lt TFI!I +.PY
LiiV i lJ VV LVVVVii LiiV VILIVWI LW1U VV WLVl 111V VVi11ViiL VWJVU Vii LiiV 1ViiV VV 111 JVii
V V11U1 Ll or
91 Washington County Development Code
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G . A .. I .......... .............'�'k,.n...az..Y�.. aura... �a. �. lai.. a. a.+. x. r... Y. 1. i.££. �arpaxt.. nn... l:�..Y�.:t..F..x.�a.�axt..... +k .. n... n. a• i. Yxi..xt...�.1....Y�.n.i.a....a: era. na. a .aa.Y.1....�.la.Y�.n.Y,Y�, +.i.. . .... �.. x. �.. �..... �.aa.r1.....Y•.a.n.�...F.s.�..x
�...� �,.�.....�LY,,...Ly .x.��.,..,..,,., wL�..�.�.. L...� .,..�...L .. ...........u...x L�,,L,.,.�,L..,.. L...,L. L....x ,,.., �..�.
F "" ' o�,l ... l." +11P../Tr; m.nunll l�cnrr, +inr nroa....
�,.�.....�LY,,...Ly ...,..�..,..L, w..,�. L"' .,..�...L .. ...........u...x
!Rl 'M— --.+1, 1, +. ,00,- +h- nr:n;,, 1 —;1 ,Y,.,—A _— n"A +h- <,hn ,o
V-1 "" Y11V✓ "RAI fycYY' "O'V✓LVVIi .. V-Y CPYY &YYYUY " "J9 .. R1C}YXYYl,L Clli C}l �}LY\1YY'ZLl V✓YY;'ZL11lY LYY'iL' "iJY1LL11 V' "YYY �V✓YYYYV iLY3YlYY;�"
ton l.0 1 .r C „1„ +— / A
i:YV.i:7Y%Y''Yillii:Y' YYY "i3'Lk'l5'YY'VY'Y Y "�1' Y'�'
(�) .............
(C) (10) Clean sand must be used to elevate the mound distribution media bed and must
consist of sound, durable material that conforms to the following requirements:
Sieve Size
Percent
Passing
No.4
95 -100
No.8
80 -100
No.
10
0 -100
No.
40
0 -100
No.
60
0 -40
No.
200
0 -5
Clean sand must also contain less than three percent deleterious substances and be free of
organic impurities.
(D) (11) The original soil mound absorption area is determined by multiplying the original
soil mound absorption length by the original soil mound absorption width. The original soil
absorption width is calculated by multiplying the mound distribution media bed width by the
mound absorption ratio. The mound absorption ratio of the upper 18 inches of soil for new
construction, or 12 inches of soil for previously developed sites, in the proposed original soil
mound absorption area shall be determined according to Table 'IlX "in....AJ1 nn'es -+ P. -Jes'
Chapter 7090 1 501 VI or Table VVIa.
(E) (12) - The required original soil absorption width for mounds constructed on slopes from
zero to one percent must be centered under the mound distribution media bed width. The
required original mound soil absorption width constructed on slopes greater than one percent
must be measured downslope from the upslope edge of the mound distribution media bed
width and measured in the direction of the original land slope and perpendicular to the
original contours.
(F) . " " " " " " " "" "'The side slopes on the mound must nnoliot be steeper than three horizontal units to
one vertical unit and shall extend beyond the required absorption area, if necessary.
(G) (1T) Distribution of effluent over the mound distribution media bed must be by level
perforated pipe under pressure according to Section 14 and Section 15.
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(H) ( .1.5) .......................The supply pipe from the pump to the original soil absorption area must be
installed before surface preparation of the original mound soil absorption area. The trench
excavated for the supply pipe must be carefully backfilled and compacted to prevent
seepage of effluent.
(I) (1-b) ... ... ... ... ... Vegetation in excess of two inches in length and dead organic debris including leaf
mats must be removed from the original soil mound absorption area. Trees must be cut
nearly flush with the ground and stumps must not be removed.
(J) ( 7) The original soil mound absorption area must be roughened by backhoe teeth,
moldboard, or chisel plow. The soil must be roughened to a depth of eight inches. Discing
is allowed if the upper eight inches of soil has a texture of sandy loam or coarser. If plowed,
furrows must be thrown uphill and there must not be a dead furrow in the original soil
mound absorption area. A rubber tired tractor is allowed for plowing or discing. Rototilling
or pulverizing the soil is not allowed. The original soil must not be excavated or moved
more than one foot from its original location during soil surface preparation.
(K) (1 9 _) ........... All surface preparation must take place when the upper 12 inches of soil has a
moisture content of less than the plastic limit and soil conditions allow field testing of soil
properties and these properties are maintained throughout the installation.
(L) (l9) ............ Prior to placement of six inches of clean sand, vehicles must not be driven on the
original soil mound absorption area before or after the surface preparation is completed.
The clean sand must immediately be placed on the prepared surface.
(M) (2J) If rainfall occurs on the prepared surface, the site must be allowed to dry below the
plastic limit and roughened as described in Section 17.3 (173)
(N) (21) ............ The clean sand must be placed by using a construction technique that minimizes
compaction. If the clean sand is driven on for construction, a crawler or track -type tractor
must be used. At least six inches of sand must be kept beneath equipment to minimize
compaction of the prepared surface.
(0) (22) .......................A minimum of 12 inches of clean sand must be placed in contact with the bottom
area of the mound distribution media bed and must be uniformly tapered to cover the entire
original soil absorption area. Other sandy materials are allowed to be used outside of this
area to complete construction of the mound.
(P) (2 )- ... top of the clean sand layer upon which the mound distribution media bed is
placed must be level in all directions.
(Q) (2T) — —A vertical inspection pipe at least four inches in diameter must be installed and
secured at the distribution medium and sand interface. The inspection pipe must have three -
eighths inch or larger perforations spaced vertically no more than six inches apart. At least
two perforations must be located in the distribution medium. Perforations must not be
located above the permeable synthetic fabric, if used. The inspection pipe must extend to
the bottom of the distribution medium, be secured, and be capped, flush with or above
finished grade.
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I
(R) (2..5) .......................On slopes of one percent or greater, the upslope edge of the mound absorption bed
must be placed on the contour.
(S) (26) - The sidewalls of the mound absorption bed must be as vertical as practical and not
intentionally sloped.
(T) (27) ............ A minimum of six inches of sand, sandy loam or loam material must be placed on
the top of the mound absorption bed and sloped upwards towards the center of the mound a
minimum of ten horizontal units to one vertical unit.
(U) (24) m..m Construction vehicles must not be allowed on the distribution media until backfill
is placed. ...as.....described....in....S.: cti�n..... 1 .3...(.2.7.).. ,
(V) (2) 0 , —A minimum of six inches of topsoil borrow must be placed over the entire mound.
(W) (30) -A vegetative cover must be established over the entire area of the mound. The
mound shall be protected until a vegetative cover is established by use of erosion control.
The established vegetative cover shall not interfere with the hydraulic performance of the
system and shall provide adequate frost and erosion protection.
17.4 At -Grade Systems
(1) (4.) ........................At -G Systems. To qualify as an at -grade system, the system must meet or exceed the
following requirements:
(A) (A) Employ flow values in Section 12.
(B) (R) ... ... ... ... ... ... Meet or exceed the.applicable technical requirements of Section 13, Section 14,
and Section 15.
(C) (C) f MMeet or exceed the requirements of Sections 16.2 and 16.3.
(D) ...................... Met t the requirements of Section 174 (2) to Section 177 (.1.4)..
(2) (2) -- Location of At Grade Systems
.......
(A) The upper 12 inches of the absorption area must have a loading rate of 0.45 gallons per day
per square foot or greater as shown in ry . Table u. Yt nlr;
or Table W'IVIa.
(B) ( 3) .............................At -grade systems must not be installed in areas with slopes greater than 12 percent.
(C) (4) Setbacks must be according to Table V. Setbacks must be measured from the
original soil absorption area.
(2)(3) _Design and Construction of At -Grade Systems
(5)
The at -grade absorption width must be as long and naarro -V' as practical . The a ^nom^ N i
„a +1, ,,,,�+ + o., eZ A . ; a +�, „f 1 c _et. The at grade abs: Y tto�. vVidths �: u �t be determined by
VV.0 Lil tYiliJL il\JL VISVV VIi W VV tC", ill 1✓
94 Washington County Development Code
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,e xnf�
: h...� ��. �a. a. x... a. ��. �. x. ��... ...... xxray. a..a�....a....��x�...x�a..��.x. ��x �xx a... a, �txxr���x... �a�. �.... z�. r. �.a.�..�a.....��.�...�x�Y�..�.�
�... „V...VU..V.,,,...� .-", w...., — ...,, .,,.....V..o... , ..w.... �... �, ...,.,. ..V..�V....,. ww...
MM "Vem e.nt x Pxet. k,nn ..nr t�, o...f ? nn
.... V V...v..� vv ww....V V I....mt vas— .,.....I 1.,..., vv... o... v ...a......�.
i n � 'M ,ormon ,;�;+x, A;" ,--,— � _+x —p" +I,o �r; ,;v n� n�;� m--A n�,n�rn +;w nron nv.a or
V Yj Y11V "'iYyIYYY'lL'UYIYYIY V'' "IYYYlii Y'iLYYl✓r✓ Ui Vvv GN C..V VYY YIIUY .'SVYY "YYYV UIYIY' "UYI.'SVY P'i;YlJ�II UIVU UIYCY' "a.} vvVr
1 onl., J - ,
„ nl —1 ,�, A -1---+— n
/ peY YYYUi UiYi YY ' "'Yil}Y'Y't'l'lY' "rtiti Y' �' i" V" I; Y li` IYY iY' iU: Y". Y Y "iYY'.
� ..............l..KT bx. fx. F?A'xtlA..Sl6xtxF. ;43 F?AT...tK}.Sa. F.Tk'A.fkA ]M ?.�1..A1fxA.4. xT?.fxx.xd'}F'!..!x 4�bT A'lT+A F. xM....! xA '4T.!x..!xA?.fl..tK}.43..!.1MQH Fk4T... ?.AT..AA4T.rlM ?.43 ?.Yx.A A.Ax.?..
uvuvl 111 vvvclvll 1 � .� C'' /�l l� -r
(cl) The land l—
(6) ..... ...The mi'n'i mum' at-grade .. absorption "bed.- width 's'h'al'1 "be'aalc'u'late'd'by "dividing the contour loading
rate, according to _Section 16.3_(13), by the soil loading rate, and st nxc a wth
o „v,v,or L iYYeYY\iJ n n�A ........ mu ....._. ot e ......... eed ...... id ........
of thV Gj3�liY l � � Vf .9l/Yl.
The M.M.imuin at
+I,- , r 17 1, on �nn;l n +l o � �;.,; �; +l n +.,nl „o 1. , +l o nl.nnr� +; l,o� . ,; +l
r.r.o r
Y: YYUi”" YX r yy yri° Y ..... Y L YYY' C% Tre Y �7Y' YO TT rYYe'. Y' UY' Y'VYY "'V"Y'e'.Y'Y'Y'Y'5 Y.YY�'YY..... ''i'rYY:'fri' Y ETTV' I UL' YOT Y' GY' eTYY 'l}
(A) (8) - T?'hc -at gr��c bed absorption width for slopes of one percent or greater does not
include any width of the media necessary to support the upslope side of the pipe.
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(B) The at-grade absorption length must be calculated by dividing the design flow by the soil
4 .. .. ... ...
loadin rate found in Table VI or VIa, for the u 12 inches of soil and dividin by the
absorption.bed width.
Table VII
At -Grade Contour Loading Rates
96 Washington County Development Code
Contour
Pere
Loading
Soil
Loading
Rate
Rate
Texture
Other Characteristics in
Rate
(M pi)
upper 48 inches
(GPDIft)
No textural change
6
<0.1
0.00
Coarse
soil <3'
5
Bedrock <4'
No textural change
8
Sand
Layers of other textures
7
0.1 to 5.0
1.60
Loamy
Sand Fine
Banding
4
Saturated soil <3'
S
Sand
Bedrock <4'
S
Strong to moderate structure
7
No textural change
Weak structure
Sand y
6
6 to 15
1.00
Loam
Layers of other textures
Platy or massive structure
Saturated soil <3'
S
Bedrock <4'
Strong to moderate structure
6
Loam
No textural change
Silt Loam
Weak structure
5
16 to 60
0.6 -0.78
Clay Loam
Layers of other textures
Sandy Clay
Platy or massive structure
Silty Clay
Saturated soil <3'
4
Bedrock <4'
Strong to moderate structure
3
No textural change
Weak structure
Clay
61 to
0.0 -0.3
Sandy Clay
Layers of other textures
2
>120 0
Silty Clay
Platy or massive structure
Saturated soil <3'
2
Bedrock <4'
96 Washington County Development Code
Effective Septemb e. r.... 2. 3. 3 .... 20 09 ................................................................ .....................lMonthl.f. Day).,.. fYearl ............ ........................Chapter
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Four a Subsurface Sewage Treatment System Regulations
............................................... ..............................* .......... Q_+;. �...., �....... a... �.... �.... F�. x... �... �. �. r�. ��� ...xxrx�.�... +.�x�...��.r.��... �.. �. �a. �... r��. ��.... �r�r......�..� .
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(C) (9) At -grade systems must employ pressurized distribution by meeting or exceeding
the applicable requirements of Section 14.4 and Section 15 except where modified by this
section. At -grade systems located on slopes of one percent or greater require only one
distribution pipe located on the upslope edge of the distribution media, with the absorption
bed width being measured from the distribution pipe to the downslope edge of the media.
Multiple distribution pipes are allowed to be used to provide even distribution, if necessary,
based on site conditions.
(D) A ( 1O ............ The upslope edge of an at -grade absorption bed must be installed along the natural
contour.
(E) (11) - —At -grade materials must be placed using construction techniques that minimize
compaction.
(F) (12) ... . ... ... ... Six inches of loamy or sandy cover material must be installed over the distribution
media. Cover must extend at least five feet from the ends of the rock bed and be sloped to
divert surface water. Side slopes must not be steeper than four horizontal units to one
vertical unit. Six inches of topsoil borrow must be placed on the cover material.
(G) (13) ............ One vertical inspection pipe of at least four inches in diameter must be installed
along the downslope portion of the absorption bed. The inspection pipe must have three -
eights inch or larger perforations spaced vertically no more than six inches apart.
Perforations must not exist above the distribution medium. The inspection pipe must extend
to the absorption bed and soil interface, be secured, and be capped, flush with or above
finished grade.
(H) (14) ........... A vegetative cover must be established over the entire area of the at- grade. The at-
grade shall be protected until a vegetative cover is established by use of erosion control.
The established vegetative cover shall not interfere with the hydraulic performance of the
system and shall provide adequate frost and erosion protection.
97 Washington County Development Code
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SECTION 18 TYPE II SYSTEMS
18.1 Type
Systems designed according to this Section are considered Type II systems. Systems in soils with a loading rate
less than 0.45 gallons per day per square foot carl iotmust.not be used in a Type II system for new construction.
18.2 Rapidly " "P'e'rme'abl'e" "Soils.
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n „
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( (B) ... ... ... ... ... ...
v . C otTor.l::.. , '_�...w..r.
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('D) .....................Met or exceed requirements of "Seetion 1'62. and 16-3. except as mod'i'fied in this Seetion":
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ACr, --- +n D „ion 01 --- +or 7040 21 1Z() —h ;
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T -VI.
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183 Floodplain Areas
(1) (1) General must be designed under this part if the system is proposed to be located in
a floodplain. A system located in a floodplain must meet or exceed the following requirements:
(A) (A) " "' — "— Employ flow values in Section 12.
(B) Meet or exceed cable appli technical requirements of Section 13, Section 14. and Section 15.
except as modified in this part.
!R1 A Too+ .,F C-,+;-- 1 2 C-,+;-- 1 A -A C-,+;-- '�YJ'f' " " " "' iWYVV L' "Vr elic�VL,L,Y CIp� /YYL�LLY}YG' "Lli`{�11YYY�i;iLL1 legC:YYr i YY Y'ILYY L.'i VY " "C:YGNL1lJYY " "Y ✓, l}G'iJ L1lJ�11 " "1 "'Y'� a111X' "C}ylJL1C}YY
Y
X;C
i ✓'�' llSii'V i'1 L'ii:5' Y'i Y'VkYYY'li iA' fly' Y;YY'i:i "17LLY'Yt
(C) (C) - -- -Meet or exceed the requirements of Sections 17.2 to 17.4.
(D) (D) —Meet or exceed requirements of Section 16.2 and 16.3, except as modified in this
part.
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(E) ( E;........................... Meet the requirements of Section 18.32 (2) to Section 18.32 (11).
(2) (2) State and Local Requirements. The allowed use of systems in floodplains must be
according to state and local floodplain requirements.
(3) (3) ... ... ... ... ..Location of System.. An SSTS must not be located in a floodway and, whenever possible,
placement within any part of the floodplain should be avoided. If no alternative exists, a system is
allowed to be placed within the flood fringe if the requirements of Section 18.32 (4) to Section
18.32 (11) are met.
(4) A ............ Openings... There must be no inspection pipe or other installed opening from the
distribution media to the soil surface.
(5) (5) Highest Feasible Area. An SSTS must be located on the highest feasible area of the lot
and must have the location preference over all other improvements, except the water supply well.
If the ten -year flood data are available, the bottom of the distribution media must be at least as high
as the elevation of the ten -year flood.
(6) (6) Pump. If a pump is used to distribute effluent to the soil treatment and dispersal system,
provisions shall be made to prevent the pump from operating when inundated with floodwaters.
(7) (7) ......� Raising Eleyation.__When it is necessary to raise the elevation of the soil treatment system
to meet the vertical separation distance requirements, a mound system as specified in Section 17.3
is allowed to be used with the following additional requirements:
(A) (A) The elevation of the bottom of the mound bed absorption area must be at least on-
half foot above the ten -year flood elevation, if ten -year flood data are available.
(B) (B) .............. In no case shall the sand fill for the mound exceed 48 inches below the mound bed
absorption area.
(C) (C) f mInspection pipes must not be installed unless the top of the mound is above the
100 -year flood elevation.
(D) .....�.. —The placement of clean sand and other fill must be done according to any
community adopted floodplain management ordinance.
(8) (Q) f Inundation of Top... When the top of a sewage tank is inundated, the dwelling must cease
discharging sewage into it.
(9) (9) .................... Backflow. Backflow prevention of liquid into the building when the system is inundated
must be provided. If a holding tank is used, the system must be designed to permit rapid diversion
of sewage into the holding tank when the system is inundated.
(10) (Y°0) .................. Holding Tank.. If a holding tank is used to serve a dwelling, the holding tank's capacity
must equal 100 gallons times the number of bedrooms times the number of days between the ten -
year stage on the rising limb of the 100 -year flood hydrograph and the ten -year stage on the falling
limb of the hydrograph, of 1,000 gallons, whichever is greater. The holding tank must be
accessible for removal of tank contents under flooded conditions.
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(11) (.1...1.. .............. Water Level Above Top...... Whenever the water level has risen above the top of a sewage
xxxxxxxxxxxxxxxxxxxxxxx .........
tank, the tank must be pumped to remove all solids and liquids after the flood has receded and
before use of the system is resumed.
18.43 Privies
(1) ( ......� Privies Allowed. Privies shall only be considered when there is no water supplied to the
dwelling.
(2) (2) Pit Privies and Vault Prvies shall not be installed where the bottom of the pit
is less than three feet above the saturated soil or bedrock. A vault privy shall be used in areas not
meeting the three foot separation. The vault of a vault privy shall be constructed in the same
manner as a sewage tank in accordance with Section 13.
(3) (3) - Setbacks. Privies shall be set back from surface waters, buildings, property lines, and
water supply wells as prescribed in Table V.
(4) — Privy Sizing. Pits or vaults shall be of sufficient capacity for the dwelling they serve, but
shall have at least 50 cubic feet of capacity. The sides of the pit shall be curbed to prevent cave -in.
The privy shall be constructed so as to be easily maintained and it shall be insect proof The door
and seat shall be self - closing. All exterior openings, including vent openings, shall be screened.
(5) (5) ... .....................Vented. Privies shall be adequately vented.
(6) (6) Maintenance When the privy is filled to within one foot of the top of the pit, the solids
shall be removed.
(7) (7) ... ... ... ... Abandonment. Abandoned pits shall have the solids removed and be filled with clean
earth and slightly mounded to allow for settling. Removed solids shall be disposed of in
accordance with Section 22.
18.5 Holding Tanks
(1) (1) Holding Tanks Residential Use. Holding tanks may be considered for installation
installed on pry , develop; d.s. as a temporary : ; thodbasis for periods of up to 12
months, during which time measures are taken to provide municipal sewer service or the
installation of an approved system as provided in this Chapter. Holding tanks may also be
considered on a permanent basis on previously developed seasonal sites where occu is no
more than 180 days er ear water use is no more than 75 allons er da and a deyelo ment
p y......... g......... p....... y......... p .................
agreement has been submitted and approved by the Department.
(2) Holding Tanks Non Residential Use. Holding tanks may be considered on a permanent
.... .
basis for non - residential, low water use establishments with a sewage now of 150 gallons
per day or less, subject to approval by the Department or local unit of government
(2) (3) f Holdmg Required,.. Holding tanks must be used for floor drains for vehicle
parking areas and existing facilities potentially generating hazardous waste.
(3) (A) .......................... '— H Tank RequirementsTo qualify as a holding tank, the system must:
100 Washington County Development Code
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(A) (,; Meet or exceed a- Plicablethe requirements of Section 13.2 or 13.3
(B) (B) Meet or exceed the applicable requirements of Section 16.2.0).
(C) (C) .....�.. —Meet or exceed the requirements of Section 16.3 (2).
(rll...........�l.x
(4) (5) Watertightness All tanks used as holding tanks must be tested once placed at the final
...
location for watertightness as specified in Minnesota Rules, Chapter 70802M 10'2010.
(5) (6) .................... Holding Tank Access. y A cleanout pipe of at least six inches in diameter must extend to
............
the ground surface and be provided with seals to prevent odor emissions and exclude insects and
vermin. A maintenance hole of at least 20 inches in least dimension must extend through the cover
to a point within 12 inches, but no closer than six inches, below finished grade. If the maintenance
hole is covered with less than six inches of soil, the cover must be secured according the Section
13.1318.
(6) (7) Holding Tank Sizing For a dwelling, the minimum size is 1,000 gallons or 400 gallons
...........
times the number of bedrooms, whichever is greater. For other establishments, the minimum
capacity shall be at least five times the design flow. Tank sizing for floodplain areas must be
calculated according to Section 18 3--(102
(7) ......� Location. _Holding tanks must be located in an area readily accessible to the pump truck
under all weather conditions and where accidental spillage during pumping will not create a
nuisance and must meet the setback requirements of Table V.
(8) (9) -- Alarm Re.uired,... tanks must have an alarm device to minimize the chance of
accidental sewage overflow unless regularly scheduled pumping is used. An alarm device shall
identify when the holding tank is at 75 percent capacity.
(9) (10) f Maintenance Contract A contract for disposal and treatment of the septage shall be
maintained by the owner with a licensed Maintainer.
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SECTION 19 TYPE III SYSTEMS
19.1 Type Systems..
A system desig;WU -----A;-- CY M thi;�- nartthat deviates from the.._requirements _ in Section 17 is considered a Type III
system. A system in soils with a loading rate of less than 0.45 gallons per day per square foot may be installed on
previously developed sites as a Type III system. TheDeviations from the standards in Section 17 of the Chapter
must be _submitted to the Department or for approval or denial. However, no deviation is allowed from the_following
_ _
standards., and, at a minimum a Type III system must:
(1) (1) - -- Employ design flow values set forth Section 12.
(2) (?; ........................Meet the requirements of Section 13.
(2)(3) Meet or exceed technical requirements in Section 14.7 (1)
(4) (3) Meet -; r exeeedMeet the requirements in Section 15 with mound and at -grade systems
required to pressure 'but'
(5) ... Provide flow measurement.
Meet the requirements of Section 16.2.:
(6) (4) A -cr exceed the requlrel:leiYt f Sed .. and 16.3 (? 4 '
..,... . ✓ Y ....
(3)(7) ..... Meet the requirements of Section_1.6 3 Sect>on 16 Section 16.3 (23), Section 16.3 (36),
Section 16.3 (7), Section 16.3 (8), and Section 16.3 (9).
(8) (5) Follow the absorption loading rates in Table VI or Table VIa,
(4)(9) For previously developed sites, if the site cannot accommodate a soil treatment and dispersal
system sized in accordance with Table Vv . in Ik4i neso+., R -1 rh.,r +o,- 7080 21 cn or Table
� 1ilYYYYiGJVLY'YlikiV J� "liiYtL�I GVY
u 'iYi iVl1l1:LY ✓V
..........
'IVIA, a smaller soil treatment and dispersal system is allowed to be constructed if it employs flow
restriction devices that do not allow loadings in excess of those in Table xu..: Mi ules� *, 1? ales,
Chµ + env ....� l sn , T�k,lP �rl VI or Table VIa. hi those cases where a loading rate or mound
F"' .,1 Yu�,1., vY
absorption ratio is not listed in Table VI or Table VIa, an alternative loading rate or absorption ratio
must be proposed.
19.2 Flow Restriction Device.
Absorption areas sized smaller than a Type I system must employ flow restriction devices that to not allow
absorption area loadings in excess of those in Table Ev i >* r; ,P ^+ 1?Y1lPC Charm +P, _ n8 1 cr1 or Table VIVIa.
Y1111i. .Ali Y,u1. w1 L 1 ✓ 0
This provision does not apply to the original soil, clean sand absorption area of a mound system.
19.3 Previously Developed Sites.
Type III systems canmay be used on previously developed sites only when a Type I or Type II system cannot be
installed or is not the most suitable treatment.
1.9 4 T1 „,P 1T s tems w ill n r 1,P allowed ;„ areas w he re „P.1r �s,� +P,,, ,,, ,� r; ,,,� +, „P 1r
1 - .T - - Y - Nv YY oy ucvYYlo vv 111 -- 11VC vv - u11V VVVU 111 uYVUO where u X1v uyocv V1 111VU1Y1vuc V110 - cV u 1 vv uyocv u1v - 1l
]CV iY iiYG' "lY li1:YYClYV ViJiJIAY �'�
19.5 19.4 Type III Systems Allowed.
.......
Type III systems will be allowed for undeveloped lots only when two Type I or Type II soil treatment and dispersal
areas have been identified on the lot, in addition to the area utilized by the Type III soil treatment and dispersal area.
The lot must be able to accommodate long -term sewage treatment in addition to the area utilized by the Type III
system.
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19.65 Graywater Systems
(1) (1) General Graywater Systems shall be classified as a Type III system and must
meet or exceed the following requirements:
(A) (A) . .. ... ... . ... . Employ 60 percent of the flow values in Section 12.
(B) (B) v Meet or exceed applicable requirements of Section 13, Section 14, and Section 15,
except as modified in this part.
(C) (C.) ........................... Meet or exceed the requirements of Section 17.
(D) (D) - —Meet or exceed the requirements of Section 16.2 and Section 16.3.
lR A Too+ +ho or +� F C -,+; -" 10 ti Ml ,"A C -, +;-" 10 ti l21
11YV VL'YIiV i\iglA1re111V11LJ ill'tiiVVLY Vii "i `L� LLiiCL'YIV VLYVli "Y �✓
(2) ........Toilet Waste._Toilet waste must not be discharged to a graywater system.
. ...............................
.......................................
(3) (3) Sewage Tanks. The liquid capacity of a graywater septic tank serving a dwelling must be
based on the number of bedrooms existing and anticipated in the dwelling served and shall be at
least as large as the capacities given in Table VIII.
Table VIII — Minimum Septic Tank Capacity for raywater Systems
Number of Bedrooms
Tank 1
Tank '2.
Two or less
1,000
500
Three
1,000
500
Four to Five
1,000
1,000
Six to Seven
1,000
1,000
Eight to Nine
1,500
1,000
Ten or More
Septic tank shall be sized as: (2,000 + ((4 of bedrooms -
9) X 150)).
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SECTION 20 TYPE IV SYSTEMS
20.1 General..
A system designed according to this part is considered a Type IV System. TheThis system must:
(1) (1) ... ... ... ... . Employ design flow values set forth_in Section 12.
(2) (2) --Meet or exceed applicable technical requirements of Section 13, Section 14, and Section
15.
(3) IQ) ............ Meet or exceed the requirements of Section 16.2.
(4) (4) -Meet or exceed the requirements of Section 16.3 (1) ;nd Section 16.3 (- ,.3excei)t as
modified in this part..
(5) (5) Meet or exceed the requirements of Table IX, Wnd Table XII ;- T %J ; - , D Chapter
7480:23541 or Table X.
(6) ..Meet soil dispersal requirements of Section 17, except that the reductions in_Section 17.2(3)(D)) are
not applicable.
20.2 Previously Developed Sites..
Type IV .
ystems canmay be used on previously developed sites only when a Type I or Type II system cannot be
installed or is not the most suitable treatment.
2n z T .x,�. + ems w ill
LV.✓ 1}'1JV Al 1♦ Jy JLV111J will VViL11V VVVU 111 iL1 ViLJ VV11V1V Q 11V VV Jy JGVlll V1111V U111ViLL1 V11J - cV Q 11VVV J}'JCVlll i1.1V11V 1:
£. as ibl e ; f f il
1V QJl V1V111i1.11 U1V occurs
20.E 20.3 Type IV Systems Allowed.
....
s .... .
Type IV
systems will be allowed for undeveloped lots only when two Type I or Type II soil treatment and dispersal
areas have been identified on the lot, in addition to the area utilized by the Type 11IIV soil treatment and dispersal
area. The lot must be able to accommodate long -term sewage treatment in addition to the area utilized by the Type
IV system.
Table IX
TREATMENT COMPONENT PERFORMANCE LEVELS AND METHOD OF DISTRIBUTION BY
TEXTURE GROUP'.
104 Washington County Development Code
iJ<#11 1U1L 441U LfiUU,.1
L �l4illG lfil Lit iJlly
L1Y 111 .1TL11111VJUiiI
ID- ul�, Cl�at�r
7080 21 X0 Texture
Group2
Vertical
1 ..5AII Sands and
°Sandy
10 11Clay, Clay
Separation (inches)
Loamy Sands
........ ......... .......
Loarn, Loam,
.....
Loam
Silt Loam
Treatment Level A, PressureUniform Distribution, Timed
12 – - 17173
Dosing
3
Treatment Level B Pressur;,Uniform
Treatment Level B,
18-23-3-5
Distribution, Timed Dosing
Pressure-Uniform
Distribution
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24 36 +
Treatment Level
A. -.2 or B
Pressure -2,
Uniform
Distribution,
rr;Y, c
11111VU
Dosirij
Treatment Level A -2 or_B, Pressure -2,
Uniform Distribution,. Treatment
Level C
' The treatment component performance levels correspond with those established for treatment components
under the product testing requirements in Table III of Minnesota Rules, 7083.4030.
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2 With less than 50 percent rock fragments...
3 Additional vertical separation distance is required as determined in Section 16.3(3).
20.E 4..........SoJ.1 L.oadin2 Rates,
The. absorption area and ..mound... absorption .ratio.. must be sized according to Table 1a . tLLliiY " °IiLL'Li'Y" li l'
Deter mpnrng Bottam.Absorption Area for Tre'nchas and.'Sce'p' age " Beds. .for.-Efflue'nt ee-ting.. Tre atn ent'Level A and
B .... rxxa s�... F�... kx. nsa, r�* a.. n�x?.. �. �kx .sa,n......rya.#.�rn.�.xxax x?.�c..�. Lin. n�. s�..... 1�.. �. �. n�ai- n.# x. n.+ �... f� ..r.�,�r..�.T,�a.+�Ex..,sxk�a a. sx. c�.......Q-;J.. r�a�s�r .r.�r.. #a..nn.s�....�s.�..
i. w..0 llv . 1wL.v lv. Lvw... ...� l.lvu..0 1lw . 1l.vw v ...� LvLU..vu ��..
VI orb using Table a if vt usi `� ueta led uv l des; — ; - -Vla.
..1.....V OVCU lcu.vo� c...u�3LV. VvV.c.✓✓V y S N
Table `4
T..11 AJ1IN ..RATES. FOR DETERMINING BOTTOM -ABSORPTION ARE.A FO .TRE.. WH
Q. , V , � RLyc nn L ,T ITLn�TT nor �TINIC 7V ID :T n L n�TT I L V V I Q � :�:;? � i�`Ty �RCn�vT1,
A AT!0 ISO yI A/FnITNyl T?VQADTInX iii ziC LTCINC- P rrinxT T
*coo C-, +; 1 Q 7 F +o,, ..,; +1, +1,;� +,.HO F� ;1 1r- TT D.,H;Al- Do �„o
See UV'V Lion 1 V.2 f LL Jystem, With, Lhis t yp e s ill JV.1 `ly'1JV Yl� "U.T/.Uxy' 1 V1tYYG QY3YV lJ /l.J ✓y�T LV YlYS
106 Washington County Development Code
ID o, -+:-H ]D-+-
<�xv11 1- . vuulll�..
iuullu
Y:"e VCi'Y'Ll
(Minu P er . yr.1�y
(Minutes'Pe'r.
1 \L1LL
111)3U1 T141U11
4{11L f
1\LL L1U>
X0:'1' *'
n 1 5 (
V. 1 ✓ llJ Vi. Y VRGUiV
v 3
coup
15
l 3
1.6.........3`,3
/ 1.0
41': 78
31 As
0 '7s
i.d
4 tin
n_ti
>60
03
5'.0
*coo C-, +; 1 Q 7 F +o,, ..,; +1, +1,;� +,.HO F� ;1 1r- TT D.,H;Al- Do �„o
See UV'V Lion 1 V.2 f LL Jystem, With, Lhis t yp e s ill JV.1 `ly'1JV Yl� "U.T/.Uxy' 1 V1tYYG QY3YV lJ /l.J ✓y�T LV YlYS
106 Washington County Development Code
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SECTION 21 TYPE V SYSTEMS
21.1 Type
A system designed according to this part is considered a Type V system. The system must:
(1) (1) ... ... ... ... . Employ design flow values set forth_in Section 12.
(2) (2) v Meet or exceed the requirements of Section 16.2.
(3) (3) Be designed with vertical separation that ensures adequate sewage dispersal and treatment.
Design factors to consider include, but are not limited to, effluent quality, loading rates,
groundwater mounding if loading rates are in excess of those in Table XII in i�:� ""' 'otµ "-
""
Charm +Pi - 7090 _ or Table XVIa loading methods and soil conditions. SSTS must not
contaminate underground waters or zones of periodic saturation with viable fecal organisms.
21.2 Previously Developed Sites.
Type V systems canmay be used on previously developed sites only when a Type I or Type II system cannot be
installed or is not the most suitable treatment.
21 3 T V sy will n 1 0 - ' allowed in areas whe re ., ---, --+— ,,, ,�;�;� r; ,,,� +- n
c. - x - .� -r y Nv ♦ - -ma ocvrriu will - uiiv vvvu iii uivuo v u iiv o Vi - irivuiiivuc Viiu - cv u iiv uy ucviii uiv - rive
]Cii iLJiiiiG'il lU.YrI;LYV V'vGClr�':
221.E 21.3 ......... Type V Systems Allowed.
........
Type V systems will be allowed for undeveloped lots only when two Type I or Type II soil treatment and dispersal
areas have been identified on the lot, in addition to the area utilized by the Type 111V soil treatment and dispersal
area. The lot must be able to accommodate long -term sewage treatment in addition to the area utilized by the Type
V system.
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SECTION 22 MAINTENANCE
22.1 Management Required.
All new and replacement SSTS must be operated in accordance with the management plan submitted, reviewed and
approved by the Department r 1. �al.xrxtf� xxr.r.c:rt:prior to. issuance of a. construction.permit. At a minimum
management plans must include the following:
(1) (1) — maintenance requirements, including frequency;
(2) (2).. -- - operational requirements, including which tasks the owner can perform and which tasks a
licensed service provider or maintainer must perform;
(3) (3) - monitoring requirements;
(4) (4) - requirements that the owner notify the Department when the management plan
requirements are not met;
(5) ...... --- disclosure of the location and condition of the additional soil treatment and dispersal area
on the lot or serving that residency; and
(6) (6) Wither requirements determined by the Department.
22.2 General.
SSTS and all components must be maintained in compliance with this Chapter and manufacturer requirements.
22.3 Frequency of Assessment
The owner of an SSTS or the owner's agent shall regularly, but in no case less frequently than every three years:
(1) (1) ...... --- Assess whether sewage tanks leak below the designed operating depth and whether sewage
tank tops, riser joints, and riser connections leak through visual evidence of major defects.
(2) (2) Measure or remove the accumulation of scum, grease, and other floating materials at the
top of each septic tank and compartment, along with the sludge, which consists of solids denser
than water.
22.4 Maintenance Permit and Reporting.
Prior to p erformin g the maintenance required in Section 22.3 ( a maintenance permit must be obtained b the
licensed maintenance business from the Department. A valid maintenance permit must be on the site where the
maintenance activities are bem erformed A coin leted um m record must be rovided to the De artment
g p........ p......... p......I .g........ ......... p ......... .........P ................
within 90 days of the maintenance activity.
22.5 Removal of Material.
(1) All solids and liquids must be removed by pumping from all tanks or compartments in which the
top of the sludge layer is less than 12 inches from the bottom of the outlet baffle or transfer hole or
whenever the bottom of the scum layer is less than three inches above the bottom of the outlet
baffle or transfer hole. Total sludge and scum volume must not be greater than 25 percent of the
tank's liquid capacity.
(2) 22.5 Removal of accumulated sludge, scum, and liquids from septic tanks and pump tanks must
be through the maintenance hole. The removal of solids from any location other than the
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maintenance hole is not a compliant method of solids removal from a sewage tank, and this method
does not fulfill the solids removal requirements of this Section or a management plan. Liquid and
solids removal from cleanout pipspipes is allowed for holding tanktanks.
(3) 22.I After removal of solids and liquids, from a system installed after the effective date of this
Chapter, the system. shallmaintenance hole cover must be secured as described in Section
13 13.18(1). Covers secured by screws shall be refastened in all screw openings.
(4) 2...... z .................After removal of solids and liquids from a system installed prior to the effective date of this
Chapter covers mustmaintenance hole covers must be sound, durable, . and of adequate strength as
specified in Section 13.18(3), and:
(1) "B brought — 'vVYiYp1YU.YYee with C- -- i3. "13 Yf retr_fttted tV be 1-- hL '1 — the — U A
JIAi iWV e
c�. ---- buried with a minimum of 12 inches of soil..
(A) (3) 1f the cover woor, if the cover is currently at or above grade, the system mYYustthe
ground surface or inches. from.final.grade, be secured by a method that was
deemed secure prior to the effective date of this Chapter.
(B) 22.8 Meet the requirements of Section 13.18( if the cover is to be raised at or above
the or within 12 inches from final grade
22.6 Pump Tank Maintenance
......:.........
Pump tanks must be maintained according to this part. Sludge must be removed if within one inch of the pump
intake.
1 22.° ......7, ....... Privies,,
When a privy is filled to one half of its capacity, the solids must be removed. Abandoned pits must have the sewage
solids and contaminated soil removed and must be filled with clean earth and slightly mounded to allow for settling.
Removed solids shall be disposed of according to SQ^tio:Sections 22. ?..1.9 and 23.
22.1 S Additives.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additives, which are products added to the sewage or to the system with the intent to lower the accumulated solids
in sewage, must not be used as a means to reduce the frequency of proper maintenance and removal of sewage
solids from the sewage tanks as specified in this Section. The use of additives does not fulfill the solids removal
requirement of this Section or a management plan. Additives that contain hazardous v. =astesmaterials must not be
used in an SSTS.
22.11.........9 Septage.
Septage or any waste mixed with septage must be disposed of in accordance with state, federal, or local
requirements for septage and other wastes. If septage is disposed of into a sewage or septage treatment facility, a
written agreement must be provided between the accepting facility and the maintenance business.
?? "?
2 ......Land_Spreadin . of Septae.
.��
Land appication of septage be accordance with Section 23 of this Chapter.
22.11 Use of Soil Treatment Site.
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I
Activities on the current soil dispersal system or the reserve soil dispersal system, as defined in Section 2.2 (5865)
and described in Section 9.4, that impair the current or future treatment abilities or hydraulic performance of the soil
dispersal system are prohibited. This includes, but is not limited to, covering all or part of the soil treatment system
with an impermeable surface as determined by the local u xit of govexxxme.— tDepartment.
22.13 10 System Remediation.
Any maintenance activity used to increase the acceptance of effluent to a soil treatment and dispersal system must:
(1) (1) Not be used on a system failing to protect groundwater as defined in Section 4.3 (2), unless
the activities meet the requirements of Section 20 or Section 21.
(2) (2) " " " " " " " " "" "'Not decrease the separation to the periodically saturated soil or bedrock.
(3) (3) Not cause preferential flow from the soil treatment and dispersal system bottom to the
periodically saturated soil or bedrock.
(4) (4) ... ... ... ... ... Be conducted by an appropriately certified qualified employee or an appropriately licensed
business as specified in Minnesota Rules, Chapter 7083.0790. Any substance added with the intent
to increase the infiltration rate of the soil treatment and dispersal system must not contain
hazardous substances.
11 1 n r; -
c:zj'. x r ...... sx' �; a' �' xrs�et' xrxu:xrxvtirxts:xx'v"vix�xtx�v��v �' xxxu: xe' rxruxxr�, axxxx °uv��c;'uru:ra'�"ri'�;vr�ts
110 Washington County Development Code
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SKTION..23.. LAND APPLICATION OF SEPTAGE
23.1 Allowed Sep tage
This section applies to land application ofuYxipixYg activity i�Y the County domestic septage_only. Non domestic
septage.> regulated.under MPCA Type N. waste. rules..
23.2 Permits and Licenses Required
..................
(1) A Permit from this Department is required for each unique parcel of land to which septage is
applied.
... _ _ _ _ _ _
(2) ..... Land must conducted a licensed maintainer business
23.3 Permit. Application
An application for a Permit to land apply septage on a specific parcel of land shall report such dµ *La arrual? be made
to the Department on forms provided. by the Department. At a minimum the application must contain the following
information:
22,45 "' MSTS "must be mainta -ined. aecording. to'th'i's Se cti'an
22 xx xx xx x
2.2....1..2............ Pxx
xx xxx x x xxxx x x xx x P xx x xx x x x x x x x xx x x
end= �int�� any- anualxnd- th�a:�ual�ust- l- srnitt�d ..tom...*,- ���rr:nt= vr�..3� -1�1 unit -�f g€�v�rnrn�t
b for ystclnn r ti n.. -.:T .:.rn a mil' -shall wlud - copy- -oft .:.pl�s.:.arrd' -s if ati n '- wiltdr ids'- f'tl
77 1 4 All , r, TRCTC �l 11 I. ., +-A , A__ 1,,,..,1 +; .�.�.;+ �„1.,�.;++_A --A o � . 41, +l,o ,�o�; _
Y° lYY" YYl' i' Y' W"' lYY Yy" Y"CY":'SYY(rY'Y "'YlV XVTIVA'iit" f_IVY' i' Y' YY' i;"': Y"C fIY3' Yi L'LQ' L VY TGYY "'L'YY%;W "'IYv:Y'Y'5YY':
..[.... /.. 19 ....._IAA i(k Yf).].,] ,4,E. ,fP C]""'.l._" ]I'1�'al\Yl'i YP fY._l It .IV.C.IIY�'l�T1tC.P.EE �1tKA.._1r.P1�+1 (T]YL..._�.._A.....
GJGJ.1/ Llll �1 W1IW VV WLVl J11W11 VV AAAVAAALVA iii WV VVIWWAIVV v. LJVVL1V11 11.
�n 11Y o� _Y o...p geocode for the proposed receiving site,
1 l PY
/r L.LV y 1 1
(2) The name and address of the landowner:
(3) _A signed copy of the agreement with the_landowner for application on the specified_ parcel of
land; - - .. ...._ _ _ _ . .....
(4) A map to scale of the parcel showing the exact location within the parcel where land application is
being pro posed; _ _ _ - -
(5 Soils information at each land a site. Soil information shall include soil observation lo
and a*
.so1 survey map of each site,
(6) Information regarding the nutrient suitability forland application of the proposed site, including_
current soil nutrient levels and proposed nutrient loading rates;
(7) Information regarding the drainage, slope, absorption rates, and separation distance from saturated
soil conditions, bedrock, or other restrictive laver of the pro posed site.
............... p.......... p......
......) ......................... ....... T ................ed ........ pp...
8 he ro os a locat i on rates p
volumes of septa e to be applied, method of a lication
......................................................................................................................... ........ g....................................... pp . ................................................................................................. "
incorporaton,...date(s).. of.application. and conditions..to..application ;.
(9) The cover crop and /or proposed cropping information;
(10) A description of the pathogen and vector control methods to be used
(11) A description of how public access to the site will be controlled.,
(12 Geocodes and addresses of the pro perties that are the sources ofthe se ptage pro osed to be land
a pplied., _ s � _ � s
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(13) ................... Copy _of a notice of intent to apply septage to the local of_Government that has zoning_ authority_
over the parcel of land receiving the applied septage..
Duration of Permit
.
.2.3.14 ................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Permit . shall be valid. for . a. period. of no.longer.than two.. years. from . the date. of issuance.
23.5 M : aximum Volume
The maximum volume of septage that can be applied to each acre of land in each land application site must be
immedi rely corm" wrid reporteddetermined using the following equation:
u _
AAR =N /0.0026
Where:
AAR = Annual Application Rate in gallons per acre per 365 days
N = amount of Nitrogen in pounds per acre per 365 days needed by the crop or vegetation to be grown on
the land
The maximum allowable volume of domestic septage shall also take into account any nitrogen fertilizer applied in
association with the septage
23.6 ..... Req.uirements . for Land on Sites
To be approved as a site for land a of domestic se ptage, the following minimum requirements must be
met.:.
(A) Be anon- public site;
(B) Not be in a shoreland area;
(C) _Be located in an Agricultural Zoning District. No land application is allowed in residential,
institutional or commercial /mdustnal zones
(D) .......Contain soils. that are not.rapidly..permeable at the application. depth,
(E) . Not be located in a floodway or floodplain;
(F) Not contain slopes greater than 12 percent; and
(G) Not be classified as Very High Sensitivity or High Sensitivity of groundwater pollution
Chien- ........
Washington Count .. (MO . , developed by the Minnesota Geologic the
of Minnesota. The Geologic Atlas of Washington County_ (1990) is incorporated by
reference, and is not subiect to frequent change.
(2) Septage shall either be injected or incorporated within six hours of surface application to a
minimum depth of six inches. No si amount of se ptag e shall be present at the land surface
after se is injected or incorporated.
(3) Be protected from unauthorized access..
(4) Septage shall not be applied such that ponding or runoff occurs.
(5) _Septage must not be_applied unless the soil has dried adequately from previous applications or
rainfall so that ponding does not occur.
(6 Se shall not be a b spray irri gation or other methods that will cause aerosols to drift
from the a pp n licatio site
.......
23.7 Soil Suitability
For the land application site to be suitable, the soil on the site must meet the following requirements:.
(1) Have medium or fine surface textures with a soil hydraulic loading rate less than or equal to 0.78
g pd /ft (percolation rate slower than 5 minutes per inch). Land a must not be performed
on sand or beat surface textures:
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(2) _Have _a three _foot vertical separation fromthe application depth to saturated soil conditions or
bedrock;
(3 Have six inches of available water holdin capacit between the a depth and satured soil
conditions or bedrock 4
(4) .......Have. at least one horizon in the.upper five feet that has soil . hydraulic loading rate.less.than 0 or
fine sand (percolation rate slower than 10_minutes per inch) .
Daily, surface; application, rates of domest septage on non, frozen„ non snow
covered sites
Food crops whose harvested part may touch the soil /se ptage
Maximum Daily
.Soil ..Texture
Appl atipri— Rates.........'
Food crops with harvested parts below the surface (potatoes,
_ . _
Gallons /Acre/Day
Coarse Sand,. Sand Loamy Coarse Sand
0
Fine Sand, Very Fine Sand, Loamy Sand, Loamy Fine Sand, Loamy Very
25,000
Fine Sand
Sandy Loam, Coarse Sandy Loam, Fine Sandy Loam, Very Fine Sandy
15,000
Loam. Loam, Silt Loam, Silt
30 da s
Sandy Clay Loam, Clay_ Loam, Silty Clay Loam, Sandy ,
10,000_
Silty Clay, Clay
0
23.8 Required Application Methods
(1) Land application methods must comply with Code of Federal_ Regulations (CFR) 40, Part 503 for IIIIIIIIIIIIIII
pathogen reduction, vector attraction, and for maximum volume of septa_ge that may be applied to
an site durin a 365 da p eriod. 11111111111
2 When soils are snow covered or frozen the application rate is limited to 10 000 allons er acre or
......) ..................................................................................................................................................................................................................................... pp.................................................................................................................................................... g.............................. p.............. ...............................
less,. and a .plication.is only.allowed on.slopes. of 2 percent or_less .. Each area of the. site may only
be covered once.
(3) Septage must not be applied on areas with ponding water.
(4) Land application sites shall not be used for crops for direct human consumption unless the waiting
periods on Table XI below are followed:
Table XI
Restricted. Activity
W*J x PgPencid
Food crops whose harvested part may touch the soil /se ptage
14 months
( melons, sq uash, tomatoes, etc.
Food crops with harvested parts below the surface (potatoes,
_ . _
38 months
carrots etc.)
...... ..................
Feed, food, or fiber crops that do not touch the soil surface (field
30 day_ s
corn, sweet corn, hay, flax, etc.)
Turf harvest
1_y ear
Grazin of ... animals
30 da s
Public access to land
High potential for ex posure
1 year
Low.p9tential for . exposure
30 day
23.9 Slope Restrictions
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<2%
Allowed
Allowed
Allowed
2 -6 %
Allowed
Allowed
Not Allowed
6 -12%
Not Allowed
Allowed
Not Allowed
>12%
Not Allowed
Not Allowed
Not Allowed
P. 0 Setback Re u reinents
Table II .:, ,o Or - ,c
i ee r r0v
�/ V4 iYVY V JGi V i{�V Y_}Y V V YU e
Setbacks
to Physical
Features
inlets other surface water and sinkholes
Setback
Distances in
Feet
Surface
Appl ication
Incorporated.
Injected
Private drinking water well
200
Public drinkin water well*
1000
Irrigation well
100
50
50
Wetlands
150
75
75
Occupied building
300
200
100
Residential subdivision
600
300
300
Commercial subdivision
600
300
300
Recreation area
600
300
300
Recreation trail
200
100
100
Public contact site
600
600
300
Propert .. line
25
25
25
Road right -of -wa
50
25
25
*There may be_ special reg1t rements f the application site is wellhead protection area
23.11 Reporting Re. gluirements
The ermittee must submit to th
p ..................e De ... artment an annual re p . ort. The re orti p..................... n ear will . run from September 1 of
.......................................................................................................................................................................................... ............................... .................... ................................. y............................................................ ............................... ....................... ...............................
each year through August 31 of the following year. Such report shall be submitted to the Department or -loual unit
of R.0- reM.- ent no later than November 1 of each year. The following information is required to be included in the
report:
114 Washington County Development Code
Setbacks to lakes . streams
wetlands drama e tale
inlets other surface water and sinkholes
Setback Distances
in Feet
May .to..Clctobe..r
November to April,
Percent
Slope,
Inn ected
Surfaec. Applied
Incorporated
In1 ected Surface.
Incorporated
0 -2%
150
300
Not Allowed 600
2 -6%
300
600
Not Allowed
6 -12%
300
Not Allowed
>12%
Not Allowed
23.11 Reporting Re. gluirements
The ermittee must submit to th
p ..................e De ... artment an annual re p . ort. The re orti p..................... n ear will . run from September 1 of
.......................................................................................................................................................................................... ............................... .................... ................................. y............................................................ ............................... ....................... ...............................
each year through August 31 of the following year. Such report shall be submitted to the Department or -loual unit
of R.0- reM.- ent no later than November 1 of each year. The following information is required to be included in the
report:
114 Washington County Development Code
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(1) _Daily_land application activities, including, but_not limited to
(A)
Each site where septage was applied, the date of application, permit number for the site,
_ _ _ _
and Geocode of the site,
(B)
The exact location on the site se was a pplied , and the number of acres which
x _ -y
received.septage..
(C)
The total volume of septage applied to each land application site;
(D) ..
The method of application used for each land application site;
(E)
Vector attraction reduction and pathogen reduction method used. If lime stabilization is
used, records must indicate the pH of each load;
(F
A descri tion of any additional management ractices and site restrictions that were
1?.. ........ ......... P ......... ......... ......... ......... ......... ..........
used.
..............
(2) Any other analysis of information required by_the Department in the Permit.
115 Washington County Development Code
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I
SECTION 2.3....24 SYSTEM ABANDONMENT
X124.1 Tank Abandonment.
All systems with no future intent for use must be abandoned according to this Section. Tank abandonment
procedures for sewage tanks, cesspools, leaching pits, drywells, seepage pits, vault privies, and.. .pit privies axed
di-stribu-tion-devic-cs must meet the requirements of Section 2324.1 -(1) to Section 232
(1) (1) All solids and liquids must be removed and disposed of according to Section 22 by a
licensed maintenance business.
(2) (2) ...... ---All electrical devices and devices containing mercury must be removed and disposed of
according to applicable regulations.
(3) (3) Abandoned tanks or any other underground cavities must be removed or remain in place
and crushed with the remaining cavity filled with soil or rock material.
(4) (4) ... ... ... ... . The removed tank or tank fragments and any soil visually contaminated with sewage shall
be disposed in accordance with Section 2324.3.
224.2 Future Discharge
Access for future discharge to the system must be permanently denied.
2324.3 Removal of System.
..... ........ .........
If soil treatment and dispersal systems are removed, contaminated materials shall be properly handled to prevent
human contact. Contaminated materials include distribution media, soil or sand within three feet of the system
bottom, distribution pipes, tanks, and contaminated soil around leaky tanks. Contaminated material also includes
any soil that received sewage from a surface failure. Contaminated materials disposed of offsite be disposed
of according to Section 21 24.3 - {1) to ue�,tilor. 2324.3 -(2).
L_l l
....................... nffcatn m a_c k._I..... P ._o inn arr�% xn._tca...0 -- ion 1'1 1._1.....
(1) (2) If contaminated material is to be spread or used on site within one year of contact with
sewage, the material must be placed in an area meeting the soil and setback requirements described
in Table V in Section 16 and Section 16.3 (3) of this Chapter and the material must be covered with
a minimum of six inches of uncontaminated soil and protected from erosion. After one year
following contact with sewage, the material is allowed to be spread in any location meeting the
setback requirement of Minnesota Rules, Chapter 4725.4450, covered with a minimum of six
inches of uncontaminated soil, and protected from erosion. After one year following contact with
sewage, the material is allowed to be used to fill in the abandoned in place sewage tanks.
(2) (3) ...... --- Contaminated pipe, geotextile fabric, or other material must be dried and disposed of in a
mixed municipal solid waste landfill.
(3) 23.4 The person or business abandoning the system must complete and sign a record of
abandonment that states the system was abandoned according to this Section. A description of the
abandonment procedure must be recorded including a map of the remaining in -place components
and location of the components removed. The record must be sent to the Department or local unit
of government within 90 days of abandonment.
23.E 24.4 MSTS Abandonment.
..
MSTS no longer In use must be abandoned according to this Section 24.
116 Washington County Development Code
Effective Septembe.r....2.3. 009 ..................................................................................... lMonthl. f. Dayj.,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
SECTION 24 25 PRODUCT REGISTRATION
425.1 Product Registration m Compli ance with St
All product registration shall be in accordance with Minnesota Rules 7083.4000 to 7083.4120.
24.2 25.2 Registered Products Approved by the Local Unit of Government.
..........
Technology and products employed in system design shall adequately protect the public health and the environment
as determined by Minnesota Rules, Chapter 7083, and be approved for use by the Department or local unit of
government.
117 Washington County Development Code
Effective Septembe.r....2.3. * ....2. 009 ................................................................ .....................lMonthl.f. Day).,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
SECTION 2526 ENFORCEMENT
226.1 Misdemeanor.
It is hereby declared unlawful for any person, firm or corporation to violate any term or provision of this Cha»ptcr.
+r rvsru.rrvsrr rrrvrivst . r inance ny..v o ation o t is Ordinance .. shall e a misdemeanor. Each ay that a violation is
allowed to continue shall constitute a separate offense. Citations maybe issued by the Department _pursuant to the
procedure set forth in the Washington County Administrative Ordinance.
"' Corrective Act.ions
hl the event of a violation or threatened violation of this Chapter, the Department, in additio_r t Wither rerTrc 1 ;e
rTray rev ��t may institute civil .sr rrvvv;euingslncluding limited to request for_ injunctive.
relief to prevent, restrain, correct or abate such violations or threatened violations. hl addition, written notice in the
form of a license complaint may be made to the Commissioner of the Minnesota Pollution Control Agency.
25.? 26 3 .......... Public Health Nuisance Control.,
hl cases where a public health nuisance has been determined to exist, the Department may institute enforcement
action under the Local Public Health Act, Minnesota Statutes, Chapter 145A and; the Washington County Public
Health Nuisance Ordinance, *, No. 165...or subsequent revisions there".tothereof and
the Washington County Administrative Ordinance.
SECTION—M2 SEPARABILITY
2627.1 Separability....
It is hereby declared to be the intent that the several provisions of this regulation are separable in accordance with
the following:
(1) (1) If any court of competent jurisdiction shall adjudge any provision of the regulation to be
invalid, such judgment shall not affect other provisions of this regulation not specifically included
in said judgment.
(2) (2) If any court of competent jurisdiction shall adjudge invalid the application of any provision
of this regulation to a particular property, building or structure, such judgment shall not affect the
application of said provision to any other property, building or structure not specifically included in
said judgment.
SECTION ?728 Repeal of Chapter Four of the Washington County Development Code
28.1 Repeal.
. Four. Subsurface Sewa e Treatment System Re ulations of the Washm ton Count Vey lop merit Code as
.Chapter ......... ......... g. u ......g... g ......... y. p
adopted by the County Board September 23, 2009 is hereby repealed and superseded by this Ordinance..
SECTION 29 EFFECTIVE DATE
27.1 29.1 Effective Date of Ordinance.
The regulations contained in this Chapter shall become effective .Y . orTr...... a�raax... ....- P+- r.......CYe.�j+r 2?.......2.n0�........
theirimmediately upon passage by the County Board and publication according to law.
118 Washington County Development Code
Effective Septemb e. r.... 2. 3. 3 .... 20 09 ..................................................................................... lMonthl. f. Dayj.,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
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Effective Septembe.r....2.3. 009 ..................................................................................... lMonthl. f. Dayj.,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
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Effective Septemb e. r.... 2. 3. 3 .... 20 09 ..................................................................................... lMonthl. f. Dayj.,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
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Effective Septemb e. r.... 2. 3. 3 .... 20 09 ..................................................................................... lMonthl. f. Dayj.,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
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Effective Septemb e. r.... 2. 3. 3 .... 20 09 ..................................................................................... lMonthl. f. Dayj.,.. fYearl ............ ........................Chapter
..................................................................................................................... ...................
Four a Subsurface Sewage Treatment System Regulations
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123 Washington County Development Code
EffectiveSeptembe. r.... 2. 3. 3 .... 20 09 .............................................................. ........................ Days.,.. fYearl..................................................................................................................... ............................... ........................Chapter
Four a Subsurface Sewage Treatment System Regulations
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124 Washington County Development Code