HomeMy WebLinkAbout1998-05-06 PACKET 13.B.F2ECIUEST OF CIT°t COU(VCIL ACTIOi� COU(VCIL AGENDA
�EETING I�fEM # Q
DATE 5/6l98 � �. [J...
PREPARED BY Administration Ryan 5chroeder
ORIGINATING DEPARTMENT STAFF AUTHOR
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COUNCIL ACTION REQUEST
Discuss MCES Interceptor Alignments.
SUPPORTING OOCUMENTS
� MEPv10/LETTEF2: Ryan Schroeder City Administrator, dated 5/4/98.
❑ RESOLUTION:
❑ ORDINANCE:
❑ ENGINEERING RECOMP�IENDATION:
❑ LEGAL ftECOMMENDATION:
❑ OTHER:
ADMINISTRATORS COMMENTS
S i�
ate
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COUNCiL ACTION TAKEN: ❑ APPROVED ❑ DENIED ❑ OTHER
MEMO TO: MAYOR AND CITY C
FROM: RYAN R. SCHROEDER ���
SUBJ.: WASTE TREATMENT INTER EPTOR ALIGNMENTS
DATE: MAY 4, 1998
As Council is aware the Metropolitan Council Environmental Services Division
(MCES) has been meeting with a large task force in order to provide for
eventual alignments of a large interceptor project. The task force is nearing
the point in time when choices will begin to be made. In consideration of that
fact the City of Afton has adopted fhe enclosed resolution in support of a CR19
alignment and opposed to a CR15 alignment of the interceptor as it passes
through Woodbury. Woodbury is expected to take an official position on
Woodbury alignments this week. Proposed, is that the Cottage Grove Council
provide direction to its task force representatives (Councilmember Hale, and
the City Administrator) on alignment choices through Cottage Grove.
Enclosed are the relevant pages of the MCES staff report from their Aprii 20,
1998 meeting regarding alignment options through our community. What is
missing, and what is expected to be available for their next meeting on May 18
is the impact of each interceptor alignment on local costs. MCES costs for the
various alignments through Cottage Grove have been presented as foliows:
Ravine Alignment: $15,012,736
Kimbro Alignment: $17,642,156
CR 19 Alignment: $12,342,957
Local costs, as yet unknown, are in addition to these numbers. This being the
case, it is expected that any position of CounciB would be preliminary. We also
need to hear more of Watershed issues and opportunities relative to each
alignment. Finaily, there will ultimately need to be choices made regarding
depth of construction, type of construction, and width of easement purchased
for the construction. Those issues will be brought forward as they appear on
the MCE� ��hedute.
Council Action.
Based on Discussion.
RESOLUTION 1998 —18
C7TY OF AFTON
WA5HIlVGTON COUNTY,l�VNESOTA
A RESOLU'TION INDICATING THE CITY OF AFTON'S OPPOSTTION
FOR A SEWER INTERCE£TOR ALIGNMENT ALONG COUNTY ROAD 15
(MANNING AVENUE} AND SUPPORTING COUN"TY ROAD 19 AS A YREFERRED ROUTE
WHEREAS, the Metropolitan Council's Regional Blueprint (December 19, 199� designates the land
within the City of Afton as "Pecmanamt Rural" and "Permanent Agriculture" and the
urnuediate eastan boundary of Woodbury as "TJrban Reserve" until 2040; and '
WHEREAS, the Me¢�opolitan Council recommends limiting Afton's residenaal development to an
avaage ovaall d�sity of one dwelling imit on 10 acres in the Pem�anent Rural Area and
one dwelling unit on 40 acres in the Permanent Agriculture azea; and
WHEREAS, the City of Afton has directed iu Compret�msive Plan and Ordinances to implement �he
MetropoGtan Councii's land use plan and have adopted policies to effectuate paruanent
nttal and Permanent Agricutture development; and
WHEREAS, the residents of the City of Afton have consisteady and continuously expressed des'se
that Afton remain Paman�t Rvral and Pamanait Agriculture by maintaining Afton's
present land use plan. Their desires have been communicated via electi�s, City Council
and Coinmissias actims, referenda, morat�ia, Green Space studies, pastai surveys,
public statements, participation in public hearings, parcicipation in otha extra-
jurisdictional organizati�s such as the Valley Branch Watashed, the MN-DNR Trouc ,.
Stream Initiative and otha means; and
WHEREAS, urban sewer alignm�t along County Road 15 has the poteatial to create urban
development pressure along County Road 15 within Afton; and
WHEREAS, available mapping inforrnatiou indicates bedrock at a near the surface along the hilly
portiai of County Road 15 from Hudsoo Road to Valley Creek Road.
WHEREAS, Valiey Creek has been idenrified as a DNR Designated Trout Stream, with surface and
groundwater along County Road 15 movisig in a south and easterly direcaon; and
WSEF.�sS, a Co•.uuy Road 19 a!ig��t wmld be coordinated wi*h Walvng!on Ccunry d�i*ing
reconstructi� of County Road 19 to m;n;m;�P ���t and construction costs and
envirmmmtat impacts; and
WHEREAS, the total construction cost estimate for the County Road 15 alignment is $1,941,694 more
than County Road 19.
RESOLUT'ION 1998 —18
Page 2
• :� • • • �
1. The Ciry of Afton indicates iu support for the County Road 19 alignment for the
pr�osed Metropolitan Sewer Interceptor fa Woodbury.
2. The City of AR� strmgly opposes extending the Meaopolitan Urban Service
Area with any Sewa tntaceptor along Crnmty Road 15.
ADOPTED BY T'HE CIT1' COIINCII. OF THE CTTY OF AFLON T'HIS 21� DAY OF
APRII„ 199&
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County Road 19 — South
The County Road 19 — South alignment extends from point CG-84 to Highway 61 in Cottage
Grove as shown on Figure 7. Point CG-84 is identified as a collection point for local tnuilc
sewer systems in the Cottage Grove and Woodbury Comprehensive Sewer Policy Plans.
A lift station has been located at CG-84 due to the increase in ground elevation from CG-84 to
70` Street in Cottage Grove. The interceptor would then flow by gravity from 70` Street to
Highway 61. This alignment would provide gravity sewer service to the portion of Cottage
Grove north of 70` Street and west of C.R.19. Gravity service could also be provided to a
portion of the area between C.R. 19 and the westem edge of the Cottage Grove Ravine. All
other future service azeas within Cottage Grove would need to be collected and pumped into the
interceptor through locai trunks and lift stations.
The alignment turns west on 90` street for '/< mile and then turns south to Highway 61 in order
to avoid deep excavation that would othenvise be necessary along C.R. 19.
The following issues with the County Road 19 - South alignment have been identified to date:
• Interceptor alignment would be located adjacent to C.R.19. The purchase of additional
right-of-way may potentially be coordinated with the Washington County Highway
Deparirnent for future improvements to C.R. 19.
• C.R. 19 south of Dale Road is currently not scheduled to be reconstructed before 2010.
. The preluninary sizing of the interceptor assumes that the northeast portion of Cottage
Grove wouid be collected and pumped into the interceptor at 80` Street.
• The southeast portion of Cottage Grove would need to be served by local crunk sewers and a
lift station to connect to the interceptor near Highway 61.
• A preliminary cost estimate for this alignment segment is indicated on Table 1.
Evaluarion of Interceptor Alignment Alternarives
Apri113,1998
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COTTAGE IGROVE
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9
COUNIY ROAD 19 SOUTH ALIGNMENT � Bonestroo
Rosene
� Anderlik �
MCES FIGURE 7 � Associates
SOUTH WASHINGTON COUNTY INTERC�PTOR Enge�eera d Arohitects
Cottage Grove Ravine:
The Cottage Grove Upper Ravine Alignment extends from CG-84 to 80` Street. South of 80`
Street, the alignment could either follow the ravine south to the Regional Park entrance at
Highway 61(Lower Ravine Alignment), or continue south along Kimbro Avenue to Highway
61 (Kimbro Avenue Alignment). Both southem alignments would require a high capacity lift
station at Highway 61 to pump flow up from the ravine to the intersection of County Road 19.
This alignment would provide gravity service to the undeveloped portion of Cottage Grove as
proposed in the Cottage Grove Comprehensive Sewer Policy Plan (CSPP). Minor
modifications to the proposed local trunk sewer system as indicated in the CSPP would be
required in the northeast comer of the City down to 80` Street.
The following issues with the Cottage Grove Ravine alignment have been identified to date:
• This alignment would eliminate the need for a regionai lift station at CG-84 only if the
County Road 19 — Central alignment were choosen as the upstream interceptor segment.
Figures 10 and 11 indicate the pipe depths for this alignment if either the Bailey Lake
Gravity alignment or the County Road 19 — Central alignment were choosen.
• The ravine alignment south of 80` Street has a potential for environmental impacts such as
tree removal, temporary wetland unpacts and temporary disturption to the east shoreline of
the Region Pazk Lake.
• Maintenance access would require an improved surface trail or maintenance road along the
interceptor alignment through the County Pazk.
• Future service to the old village and northeast comer of Cottage Grove would be by local
tnuilc sewers connecting to the interceptor at 80` Street.
• A preliminary cost estunate for this alignment segment is indicated on Table 1.
Evaluation of Interceptor Alignment Altemarives 10
Aprili3,1948
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RAVINE ALIGNMENT �f aonestroo
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Treatment Plant Connection:
The Treatment Plant Connection Alignment extends from County Road 19 at Highway 61 to the
south along the existing power lines on 3M property. At Miller Road, the alignment extends
southwesterly along an existing natural gas easement until intersecting the existing Cottage
Grove trunk sewer that extends south to the treatment plant site, as shown on Figure 11. 3M has
indicated that this is their preference for the interceptor alignment through their property.
Evaluarion of Interceptor Alignment Alternarives 11
April13,1998
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Preliminay Cost Estimate
South Washington County Interceptor
April 14, 1998
Preliminary Only
The following are two of many possible examples of the total cost of the interceptor from Lake
Elmo to the waste water treatment plant. The total cost is calculated by adding the subtotal cost
from Table 1 for one northem alignment segment, one central alignment segment, one southern
alignment segment and the treatment plant connection alignment.
1.
Alienment Segment Subtotal 50-vear Present Worth Cost
County Road 19 — North
County Road 19 — Central
Upper Cottage Grove Ravine
Lower Cottage Grove Ravine
Treatment Plant Connect.
$6,220,152
$9,074,365
$3,412,627
$11,600,109
1 877 209
Total Estimated Alignment Cost:
$32,184,462
2. Alienment Setnnent Subtotal 50-vear Present Worth Cost
County Road 17
Bailey Lake Gravity
County Road 19 — South
Treatment Plant Connect.
Total Estimated Alignment Cost:
$7,668,116
$5,201,450
$12,342,957
1 877 209
$27,089,732
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