HomeMy WebLinkAbout2010-10-20 PACKET 12.A.REQUEST OF CITY COUNCIL ACTION COUNCIL AGENDA
MEETING ITEM #
DATE 10/20/201
PREPARED BY Engineering Jennifer Levitt
ORIGINATING DEPARTMENT DEPARTMENT HEAD
COUNCIL ACTION REQUEST
Workshop: 2011 Pavement Management Project.
SUPPORTING DOCUMENTS
❑ MEMO /LETTER:
❑ RESOLUTION:
❑ ORDINANCE:
❑ ENGINEERING RECOMMENDATION:
❑ LEGAL RECOMMENDATION:
® OTHER: Report.
ADMINISTRATORS COMMENTS
�i /o
City Administrator Date
COUNCIL ACTION TAKEN: ❑ APPROVED ❑ DENIED OTHER
Document5
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2335 Highway 36 w
St. Paul, PIN 55113
Tel 651- 636 -4600
Fax 651- 636 -1311
www.borestroo.com
November 3, 2010 Bonestroo
Honorable Mayor and City Council
City of Cottage Grove
7516 80th Street South
Cottage Grove, MN 55016
Re: West Point Douglas Frontage Road Extension & 2011 Pavement Management Project
Client Project No.: 10 -284 & 10 -289
Bonestroo File No.: 000048 - 10284 -0 & 000048 -10 -289 -0
Honorable Mayor and City Council Members:
Enclosed for your review is the 2011 Pavement Management project Feasibility Report. The project
scope includes street rehabilitation and storm sewer improvements in the Pine Coulee /Countrywood
(District I) and Howard's Addition (District A) neighborhoods, as identified in this report.
This report describes the improvements necessary to improve the streets and storm sewer within the
project area. Cost estimates for the proposed improvements are presented in the appendices of the
Report.
We would be happy to discuss this report at your convenience. Please contact me at 651- 604 -4917 if
you have any questions or concerns.
Sincerely,
BONESTROO
Mike Boex, PE
I hereby certify . that this plan, specification, or report was
prepared by me or under my direct supervision and that I
am a duly Licensed Professional Engineer under the laws of
the State of Minnesota.
Michael I Boex
Date: November 3, 2010 Registration No.: 44576
SECTION TITLE
Tableof Contents ................................................................................ ...............................
I
Introduction........................................................................................ ..............................2
Existing Conditions - Pine Coulee /Countrywood ....................................... ..............................2
Streets............................................................................................ ...............................
2
Sanitary Sewer and Water Main .......................................................... ..............................3
StormSewer ........ ................................................... .............. ........ .......... :....... .........
... .. 3
Existing Conditions - Howard's Addition .................................................. ..:•.r........................3
Streets............................................................................................ ...............................
3
Sanitary Sewer and Water Main ...................... .................. .................. ..............................4
StormSewer .................................................................................... ..............................4
Proposed Improvements - Pine Coulee/ Countrywood ................................ ..............................4
Streets..................................................................... ............................... , ......................
4
Sanitary Sewer and Water Main .......................... ............................... ..............................4
StormSewer .................................................................................... ..............................5
StormWater Quality . ................................................................. ...............................
5
Proposed Improvements - Howard's Addition „ ...................................... ...............................
5
Streets............................................................................................ ...............................
5
Sanitary Sewer and Water Main .......................................................... ..............................6
StormSewer......' .............................................................................. ..............................6
StormWater Quality... ................................. ...... ............................. -- .....................
6
EstimatedCosts .....' ............................................................................. ...............................
6
CostSummary .................................................................................. ..............................6
CostAllocation ................................................................................. ...............................
6
Financing........................................................................................ ...............................
7
ProjectSchedule ................................................................................. ...............................
8
Conclusions and Recommendations ........................................................ ..............................8
City of Cottage Grove, MN Page 1
2011 Pavement Management Project Bonestro0 000048 - 10289 -0
2011 PAVEMENT MANAGEMENT PROJECT
Introduction
The Pine Coulee, Countrywood, and Howard's Addition residential neighborhoods have been
identified as candidates for rehabilitation during the 2011 construction season as a part of the
City of Cottage Grove's ongoing roadway rehabilitation program. The City Council authorized
preparation of this Report to determine the feasibility of rehabilitating those streets as a part of
the 2011 Pavement Management Project.
Pine Coulee and Countrywood are located in the Southeast corner of the City and are part of
Pavement Management District I, as shown on Figure 1 located in Appendix A. There are seven
residential streets within these neighborhoods totaling approximately 11,860 lineal feet. The
Countrywood neighborhood consists of Lofton Avenue and Lockridge Avenue, with Pine Coulee
being the remainder.
Howard's Addition is located South of 70th Street and East of the Acorn Ridge development. It's
part of Pavement Management District A as shown on Figure .2 located in Appendix A. There are
two residential streets within Howard's Addition totaling approximately 1,600 lineal feet.
The purpose of this report is to further evaluate the work actually required for this street
rehabilitation project, to provide an estimate of cost, and to establish a method of cost allocation
or assessment in order to determine the physical and economic feasibility.
Existing Conditions - Pine Coulee /Countrywood
STREETS
The streets within Pine Coulee and Countrywood are rural residential and were originally
constructed in the early 1970's. Generally, the streets are 21 -24 feet wide with no concrete curb
and gutter. Gravel shoulders, although once present, have been either overlayed with new
bituminous or have been covered with vegetation over the years. The Pavement Condition Index
(PCI) of these streets range from 22 -40 as identified in the 1994 Pavement Management Plan.
Per that plan, PCI's in those range are classified as "Poor" and "Very Poor" and are beyond the
point of performing seal coats or overlays to maintain the streets.
Test pits were performed to determine the thickness of the existing street section. This
information will be used to design a recommended pavement section.
Caty of Cottage Grove, MN Page 2
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Existing Street Sections - Pine Coulee /Countrywood
No.
Location
Materials
1
11880 Lofton Ave
3" Bituminous, 3.5" Gravel, 10" Lean Clay, Sand
2
11821 Lockridge Ave
4" Bituminous, 6" Gravel, 6" Sand with Silt
3
11701 Lockridge Ave
3" Bituminous, 3" Gravel, 4.5" Sand
4
11600 Lockridge Ave
3" Bituminous, 4" Gravel, 2" Sand, 6" Sand with Silt
5
11566 Leeward Ave
2.5" Bituminous, 3" Gravel, 5.5" Sand, Mixed Soils & Organics
6
11660 Lehigh Ave
2.5" Bituminous, 7" Mixed Soils, Clean Sand
7
11700 Lehigh Ave
3" Bituminous, 2" Gravel, Mixed Soils
8
11827 Leeward Ct
3" Bituminous, 3" Gravel, 3" Sand, Clay & Organics
9
11680 Leeward Ave
1.5" Bituminous, 1" Gravel, 5" Mixed Soils, Clay & Organics
10
11760 Layton Ave
4" Bituminous, 3" Gravel, Clean Sand
11
11680 Layton Ave
4" Bituminous, 2" Gravel, 7" Sand with Silt
12
11570 Layton Ave
3.5" Bituminous, 3" Gravel, 4" Mixed Soils, 7 Sand with Silt
From the existing test pits, it can be seen that the average section consists of 3 inches of
bituminous over 2.75 inches of gravel.
SANITARY SEWER AND WATER MAIN
Currently, there is no public sanitary sewer or watermain within these neighborhoods.
STORM SEWER
There's a very small amount of existing storm sewer within Pine Coulee and Countrywood. The
storm sewer appears to be pieced together over time to address specific drainage needs.
Product materials and construction methods do not follow typical City standards.
Generally speaking, Lofton Avenue is the only street that consistently has culverts at driveways.
Other streets -in the neighborhood have little to no ditch definition and yards are typically graded
out to the edge of the street. Existing: drainage follows the street and must cross over the
driveways.
Leeward Avenue currently has three parallel 60" CMP culverts that convey runoff through a
major drainage way. Adjacent to the cross culverts is a street section with bituminous curb and
gutter.
Existing Conditions -
STREETS
The streets within Howard's Addition were originally constructed in 1974. The streets are
approximately 34 feet wide from back of curb to back of curb. The Pavement Condition Index
(PCI) of these streets range from 35 -63 as identified in the 1994 Pavement Management Plan, A
PCI of 35 is identified as "Poor" and is beyond the point of performing seal coats or overlays to
maintain the streets. There are sections of existing 6618 curb and gutter that have settled,
cracked, or have other defects that will require replacement.
Test pits were performed to determine the thickness of the existing street section. This
information will be used to design a recommended pavement section.
City of Cottage Grove, MN Page 3
2011 Pavement Management Project Bonestroo 000048 - 10289 -0
Existing Street Sections - Howards Addition
No.
Location
Materials
1
6588 71st Street
3" Bituminous, 11" Gravel, Clay /Sand
2
7123 Granada Ave
2.75" Bituminous, 4.5" Gravel, Dirty Gravel and Sand
3
7128 Granada Ave
2.75" Bituminous, 6" Gravel, 12" Sand
SANITARY SEWER AND WATER MAIN
Currently, there is no public sanitary sewer or watermain within the Howard's Addition
neighborhood.
STORM SEWER
There is virtually no existing storm sewer within Howard's Addition. Drainage generally flows
from 70th Street to the South along the existing curb and gutter. No catch basins and street
storm pipe are present within the project area. There is one cross culvert at the very south end
of the project limits that drains towards the Acorn Ridge development.
Proposed Improvements - Pine Coulee /Countrywood
STREETS
Due to the thin and highly variable pavement sections and materials present, reclamation of the
existing section could contaminate the redaimed base if additional gravel (add -rock) is not placed
prior to the reclamation process.
For the majority of the neighborhood, it's proposed to add 2 -4 inches of add -rock over the
existing pavement. Then the add -rock, pavement, and existing gravel base would be reclaimed
to a depth of approximately 8 inches. The resultant reclaimed material would then be shaped
and graded to allow for placement of 3.5 inches of new bituminous pavement. The resulting
street section would be much more consistent, comprising of 3.5 inches of bituminous over 7 -8
Inches of reclaimed aggregate base. This method would raise the road 5 -8 inches, which would
help improve the depth of adjacent shallow ditches and bring a uniformity to the pavement
section not currently present.
Due to the existing pavement section, the section of Leeward Avenue between the Layton
Avenue loop will require ,a different method of rehabilitation. In this area, subgrade excavation
would be performed, followed by placement of an aggregate backfill, construction of aggregate
base, and paving.
It is proposed that all street widths remain the same as the existing condition. The single
exception to this is the cul -de -sac at Leeward Court. The existing pavement at the turnaround is
13 feet in width. Minimum access width per Fire Code is 20 feet so it is proposed that the
turnaround be widened meet that requirement.
Each driveway would receive an apron as a part of the street reconstruction process. Gravel
driveways would receive a bituminous apron, and bituminous or concrete driveways would
receive an apron to match the existing material. A bituminous bump -out for each mailbox will
also be constructed. This will help reduce wheel rutting occurring adjacent to the edge of road.
SANITARY SEWER AND WATER MAIN
No public improvements are proposed as a part of this project.
City of Cottage Grove, MN Page 4
2011 Pavement Management Project Bonestroo 000048- 10289 -0
FA017S& Allyi4 7
It's proposed that the existing storm sewer systems be replaced with materials conforming to
City standards. In doing so, the longevity and reliability of the system will be increased and
maintenance should be reduced.
The existing bituminous curb along the culverts at Leeward Avenue will be replaced with concrete
curb and gutter. A catch basin and short section of storm sewer is proposed to collect street
drainage near the culverts and direct runoff into the drainage way.
STORM WATER QUALITY
Approximately 7 proposed infiltration features will be located along the project corridor to provide
water quality treatment and runoff volume reduction within the project area. These small scale
surface infiltration features will be located adjacent to the street and within the City owned right -
of -way. While the standard restoration option for these features will be a wet - tolerant turf grass,
the City offers residents the option to substitute the turf grass with native rain garden plantings
within the context of the project. It should be noted however that the turf grass option provides
a more economical upfront materials costs and reduces longterm maintenance costs.
Figure X identifies the most suitable locations for infiltration features. This preliminary
assessment of suitable locations is based on a field inspection that identified locations where no
conflicts with significant trees or steep slopes were present, available right -of -way appeared to
be sufficient, and the relative elevation of the location was suitable. The infiltration feature
locations identified on Figure X should be considered 'preliminary at this time. It will be necessary
to perform soil borings in some of the proposed infiltration feature locations to confirm that the
existing soils are conducive to infiltration. If the borings indicate that infiltration is not a feasible
option, alternative methods such as biofiltration basins or filtration swages will be evaluated to
provide water quality treatment within the project area.
In the past, the City has partnered with the SWWD to fund storm water quality improvements
within the context of their Pavement Management Program. It is anticipated that the South
Washington Watershed District (SWWD) will have cost share funds available for the infiltration
features and associated storm water improvements included in the 2011 Pavement Management
Project. This cost -share opportunity as well as other funding opportunities will be investigated as
a part of the final design. Although these funding opportunities vary year to year, the City will
continue to monitor solicitations as they become available.
Proposed Improvements - Howard's Addition
STREETS
At Howard's Addition, it's proposed to reclaim the existing pavement and gravel base to a depth
of 6 -9 inches. Because Howard's Addition is an urban section with concrete curb and gutter, the
top 3.5 inches of reclaimed material would need to be hauled off -site to allow for 3.5 inches of
new bituminous pavement.
The existing 8618 concrete curb and gutter will be evaluated prior to construction. Based on a
preliminary evaluation, it is estimated that approximately 15% is in poor condition and would
need to be replaced.
City of Cottage Grove, MN Page 5
2011 Pavement Management Project Bonestroo 000048- 10289 -0
SANITARY SEWER AND WATER MAIN
No public improvements are proposed as a part of this project.
STORM SEWER
As a part of this project the existing cross culvert at the south end of the project will be
evaluated for replacement.
STORM WATER QUALITY
Storm water quality improvements are not required in this neighborhood due to no increase of
impervious surfacing.
Permits and Easements
This project will require the following permits:
• Phase II General Storm Water Permit from the MPCA
No easements are anticipated in the Howard's Addition.
In the Pine Coulee and Countrywood neighborhoods, the proposed rain gardens may require
additional drainage and utility easements if they cannot be contained within the existing right -of-
way. This will be evaluated during the final design (phase of the project.
Estimated Costs
COST SUMMARY
Cost estimates for the improvements have been prepared and are included in the Appendix of
this report. All costs for items to be constructed are based on anticipated unit prices for the 2011
construction season. All costs include a thirty (30) percent allowance for indirect costs associated
with the project (engineering, administrative, financing, and legal) as well as a ten (10) percent
contingency. No costs are included for capitalized interest during the construction period or
before assessments are levied.
An overall summary of the estimated cost is shown below:
Estimated Cost Summary
Location
Estimated Project Cost
Pine Coulee / Countrywood
$1,323,000
Howard's Addition
$164,000
Countrywood Park Improvements
$152,000
Total Estimated Project Cost:
$1,639
Assessments for this project will be based upon the "Infrastructure Maintenance Task Force
Special Assessment Policy For Public Improvements," dated September 30, 2005. All adjacent
benefiting properties are proposed to be assessed. Per the Rural Residential policy, 45% of the
project cost would be assigned to each individual residential lot on a unit basis. The intent of the
City of Cottage Grove, MN Page 6
2011 Pavement Management Project Bonestroo 000048- 10289 -0
City's policy is to treat all properties within a residential development as similar individual units
regardless of lot frontage. City funds would pick up the remaining 55% of the project costs.
In the Pine Coulee neighborhood, it should be noted that two (2) "sliver" parcels were not
included in the total unit count. It is assumed that one will be turned over to the City and one
will be combined into and existing lot prior to the project. The large parcel north of Leeder
Avenue that's zoned agricultural was also counted as one unit.
In addition, the City Park was counted as 2 equivalent units for the purposes of calculating
assessments.
The total estimated project assessments are as follows:
Estimated Cost Allocation
Location
City Funds (55% of
Total)
Assessed Amount
(45% of Total)
<Estimated Project
I Cost
Pine Coulee / Countrywood
$727,650
$595,350
$1,323,000
Howard's Addition
$90,200
$73,800
$164,000
Subtotal
$817,850
$669,150
$1,487,000
Howard's Addition
12
$73,800
$6,150
City Funds (100% of
Total)
Countrywood Park
$152,000
-
$152,000
Totals:
$969,850
$669,150
,' $1,639,000
Estimated Cost Per Unit
FINANCING
Assessments are proposed to be levied based on the City's current assessment policy. The
remainder of the project would be financed through a combination of City funds such as the
General Tax Levy and Enterprise funds for items such as storm sewer improvements. General
Levy funds will be utilized for the proposed park improvements.
® p =�
Because the properties within the Pavement Management project benefit from the proposed
improvements, and the project will be partially funded through assessment, it will be necessary
for the City to hold a public improvement hearing to receive comment on the proposed project
and to determine the further action to be taken.
City of Cottage Grove, MN Page 7
2011 Pavement Management Project Bonestroo 000048 - 10289 -0
Assessable
Assessed Amount
Location
Assessed Cost Per Unit
Units
(45% of Total)
Pine Coulee / Countrywood
86
$595,350
$6,923
Howard's Addition
12
$73,800
$6,150
FINANCING
Assessments are proposed to be levied based on the City's current assessment policy. The
remainder of the project would be financed through a combination of City funds such as the
General Tax Levy and Enterprise funds for items such as storm sewer improvements. General
Levy funds will be utilized for the proposed park improvements.
® p =�
Because the properties within the Pavement Management project benefit from the proposed
improvements, and the project will be partially funded through assessment, it will be necessary
for the City to hold a public improvement hearing to receive comment on the proposed project
and to determine the further action to be taken.
City of Cottage Grove, MN Page 7
2011 Pavement Management Project Bonestroo 000048 - 10289 -0
Project Schedule
Below is the proposed schedule assuming a 2011 construction season:
• 11/03/2010
•
v
• February 2011
• Spring 2011
• Spring 2011
• Fall 2011
Council Orders Feasibility Report
Council Receives Feasibility Report
Council Orders the preparation of the Plans and Specifications
Approve Plans and Specifications and set Bid Date
Project Bid Date
Contract Award
Begin Construction
Final Completion
Conclusions and Recommendations
It is recommended that this report be used as a guide for the layout, design, and cost allocation
for the public improvements. It is further recommended that the owners of properties within the
project limits be notified of the proposed improvements in order to provide comment.
City of Cottage Grove, MN Page 8
2011 Pavement Management Project Bonestroo 000048- 10289 -0
�N
PINE COULEE & HOWARD'S ADDITION
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2011 PAVEMENT MANAGEMENT PROJECT N,�ge Grove
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