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CITY OF LAKEVILLE
RESOLUTION NO:
RESOLUTION APPROVING THE FEASIBILITY REPORT AND CALLING A PUBLIC
HEARING FOR THE KENSGINTON BOULEVARD IMPROVEMENT PROJECT
WHEREAS, on February 17, 2015, the City Council received the feasibility report for the
proposed improvement of Kensington Boulevard from 205th Street to a point just south of the
intersection with 210th Street, City Improvement Project 15-04.
NOW, THEREFORE, BE IT RESOLVED, by the Lakeville City Council:
1. The Feasibility Report for Project 15-04 is hereby approved.
2. A public hearing is hereby called for March 16, 2015 at 7:00 p.m. at the Council
Chambers of the City Hall and the Clerk shall give mailed and published notice
of such hearing and improvement as required by law.
APPROVED AND ADOPTED this 17th day of February, 2015.
CITY OF LAKEVILLE
________________________________
Matt Little, Mayor
ATTEST:
________________________________
Charlene Friedges, City Clerk
3
CITY OF LAKEVILLE, DAKOTA COUNTY, MINNESOTA
NOTICE OF HEARING ON IMPROVEMENT
TO WHOM IT MAY CONCERN:
NOTICE IS HEREBY GIVEN that the City Council of Lakeville will meet at 7:00
p.m. on Monday, March 16, 2015 at the City Council Chambers, 20195 Holyoke Avenue,
Lakeville, Minnesota, to consider the Kensington Boulevard Improvement Project, which
extends from 205th Street to a point just south of the intersection with 210th Street; City
Improvement Project 15-04, pursuant to Minn. Stat. 429.011 to 429.111.
The area proposed to be assessed for the improvements is as follows:
The project will include property in that part of Section 25 Township 114 Range
21, within the City of Lakeville, Dakota County, Minnesota, and also being along
Kensington Boulevard between 205th Street and a point just south of the intersection with
210th Street, where the improvements associated with the CSAH 70 project terminated.
The estimated cost of the improvement is $898,240.00. Such persons as desire to
be heard with reference to the proposed improvement will be heard at this meeting.
DATED this 17th day of February, 2015.
CITY OF LAKEVILLE
BY:
Charlene Friedges, City Clerk
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Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
TABLE OF CONTENTS
TITLE SHEET
CERTIFICATION SHEET
TABLE OF CONTENTS
1. EXECUTIVE SUMMARY ..................................................................................................1
2. STREET AND UTILITY IMPROVEMENT PROJECT ....................................................2
2.1 Introduction .............................................................................................................2
2.1.1 Authorization ...............................................................................................2
2.1.2 Scope ............................................................................................................2
2.1.3 Data Available ..............................................................................................2
2.2 General Background ................................................................................................3
2.2.1 Project Location ...........................................................................................3
2.3 Existing Conditions .................................................................................................3
2.3.1 Roadway Surface ..........................................................................................3
2.3.2 Storm Sewer .................................................................................................4
2.3.3 Water Main ..................................................................................................5
2.3.4 Sanitary Sewer ..............................................................................................6
2.3.5 Wetlands ......................................................................................................6
2.4 Proposed Improvements ..........................................................................................6
2.4.1 Roadway Surface ..........................................................................................6
2.4.2 Storm Sewer .................................................................................................7
2.4.3 Water Main Improvements .........................................................................7
2.4.4 Sanitary Sewer Improvements .....................................................................8
2.4.5 Street Sign Replacement ...............................................................................9
2.4.6 Street Lights .................................................................................................9
2.4.7 Mailbox Impacts ..........................................................................................9
2.4.8 Permits/Approvals .......................................................................................9
2.4.9 Construction Access/Staging .......................................................................9
2.4.10 Public Involvement ....................................................................................10
3. FINANCING .....................................................................................................................11
3.1 Opinion of Cost .....................................................................................................11
3.2 Funding ..................................................................................................................11
4. PROJECT SCHEDULE .....................................................................................................14
5. FEASIBILITY AND RECOMMENDATION ..................................................................15
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
TABLE OF CONTENTS (continued)
Appendix A
Figure 1: Location Map
Figure 2: Typical Section – Kensington Boulevard
Appendix B
Opinion of Probable Cost
Appendix C
Assessment Map ID
Preliminary Assessment Roll
Appendix D
2014 Geotechnical Report – Log of Test Borings
Corrosivity Test Results
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 1
1. EXECUTIVE SUMMARY
The Kensington Boulevard Improvement Project, City Project No. 15-04, was initiated based on
the City’s Pavement Management Program. The Kensington Boulevard Improvement Project
includes that portion of Kensington Boulevard from 205th Street to a point just south of 210th
Street, totaling 3,100 feet, or 0.59 miles.
The Kensington Boulevard Improvement Project includes roadway reclamation improvements
based on the current roadway conditions and the overall Capital Improvement Plan budget.
Reclamation of the existing bituminous pavement and roadway reconstruction, consisting of
pavement subgrade correction, spot replacement of structurally deficient concrete curb and
gutter and new pavement installation is recommended for the entire length of the project. In
addition, the existing street light system along the southern portion of Kensington Boulevard,
which is one of the few remaining City-owned light systems in the City, is proposed to be
replaced in conjunction with the project.
Replacing portions of the City’s deficient utility infrastructure in conjunction with the proposed
street improvements provides an opportunity to minimize the replacement costs and traffic
disruptions associated with the work. Proposed utility improvements include the following:
Repair or replacement of damaged or deficient sanitary sewer manholes,
Replacement of existing water main gate valves box tops,
In addition, cathodic protection is proposed to be installed along all of the watermain located
within the project limits in an effort to limit the corrosion of the existing ductile iron watermain
pipe (DIP) located beneath Kensington Boulevard, as a geotechnical evaluation has revealed the
soils in this area are moderately corrosive.
The total estimated project cost for the Kensington Boulevard Improvement Project is
$898,240.00, which includes a 10% contingency and 28% indirect costs for legal, engineering,
administrative, and financing costs. The project is proposed to be funded through special
assessments to benefitting property owners and City funds.
The project is proposed to be substantially completed in 2015, including restoration items. The
project is feasible, necessary, and cost-effective from an engineering standpoint and should be
constructed as proposed herein.
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 2
2. STREET AND UTILITY IMPROVEMENT PROJECT
2.1 Introduction
2.1.1 Authorization
On December 1, 2014, the Lakeville City Council authorized the preparation of an
engineering feasibility report for the Kensington Boulevard Improvement Project. This
project is included in the City’s draft 2015 – 2019 Capital Improvement Plan (CIP) and
has been designated as City Project No. 15-04.
2.1.2 Scope
This report investigates the feasibility of proposed street improvements identified by the
City’s Pavement Management Program and Capital Improvement Plan for 2015. The
Kensington Boulevard Improvement Project was initially considered because of existing
pavement conditions and on-going pavement tenting issues experienced during the
winter months, which can severely impact the ride quality of the roadway. The average
Overall Condition Index (OCI) value for Kensington Boulevard is 56 using an OCI scale
of 0 to 100 (with zero representing a failing street section and 100 representing a new
street section free of deficiencies).
Improvements outlined within this report include bituminous pavement reclamation,
spot curb and gutter repairs and minor utility repairs.
2.1.3 Data Available
Information and materials used in the preparation of this report include the following:
Record Plans
Water Main Repair Records
Water Resources Management Plan, Barr Engineering, dated June 2008
Dakota County Topography Maps
Field Observations of the Area and Discussions with some area Property Owners
Geotechnical Evaluation Report, Braun Intertec, dated February, 2015.
Televising Reports for the Sanitary Sewer System
Utility Record Drawings
City of Lakeville Street Reconstruction Assessment Policy
Feasibility
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Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 4
Research studies support the hypothesis that road de-icing chemicals can contribute to
pavement tenting. Roadway base materials may accumulate road de-icing chemicals,
even in relatively new pavement construction. This accumulation presents an issue for
the roadways as the de-icing chemicals can attract moisture, leading to the expansion of
the pavement and “tenting” of the pavement surface during freeze-thaw cycles.
Kensington Boulevard is classified as a major collector roadway in the City’s
Comprehensive Transportation Plan. Between CSAH 70 and the southerly intersection
with Kaiser Way (Kaiser Way is a loop street), Kensington Boulevard is constructed as a
four-lane divided roadway with dedicated left turn lanes at the intersection with 210th
Street/Kenrick Avenue. A variety of linden, crab apple and ash trees are planted in the
non-irrigated medians and boulevards, which are maintained by the City's Public Works
Staff. Over the last several years, a number of trees have been removed due to vehicle
crashes or failing tree health; many of those trees have not been replaced.
Between the two street intersections with Kaiser Way, Kensington Boulevard exists as a
four-lane urban roadway with double-yellow centerline striping as well as median
striping to facilitate the transition from concrete medians to non-divided sections of the
roadway. North of northerly intersection with Kaiser Way, Kensington Boulevard is
again constructed as a four-lane divided roadway, with a landscaped center median.
While the trees within this median are maintained by City Staff; the St. Francis Woods
Townhome Association maintains the day lilies that were planted by the Homeowners
Association.
There are bituminous trails located along both sides of this segment of Kensington
Boulevard. Access to the Pexa Park trail and parking lot is obtained via Kensington
Boulevard.
Geotechnical soil borings were completed during the Fall of 2014, to determine the
existing street section. A copy of the geotechnical soil boring logs may be found in
Appendix D of this report.
2.3.2 Storm Sewer
Record drawing information indicates that some storm sewer facilities already exist
throughout the Kensington Boulevard Improvement Project area. Runoff collected by
the existing catch basins travels through existing storm sewer pipe and outlets into:
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 5
Regional Stormwater Basin ML-2-1(Wetland #960) which is located north of 205th
Street, adjacent to Juno Trail. Runoff collected from that portion of Kensington
Boulevard north of the intersection with Kenbridge Court travels north beneath
the roadway prior to entering a an existing stormwater basin located in the
northwest corner of Pex Park, and then onto the channel system that flows
beneath 205th Street and into Regional Stormwater Basin ML-2-1. This pond, ML-
2-1, is considered to be part of Lake Marion and serves to reduce nutrient inflows
into Lake Marion.
Regional Stormwater Basin SC-23-1, which is assumed to be the channel storage
contained within the subwatershed boundaries of South Creek. This channel
storage is located along the north side of CSAH 70, within the West Branch of
South Creek west of the intersection with Jacquard Avenue. Runoff collected
from that portion of Kensington Boulevard located south of the intersection with
Kenbridge Court travels south beneath the roadway to an existing stormwater
basin located in the northeast corner of the intersection at Kensington Boulevard
and 210th Street. That stormwater basin then outlets into a tributary to the
channel that has been identified as SC-23-1.
Historically, the existing storm sewer facilities within the proposed project area have
proven adequate during smaller rainfall events.
Private storm sewer facilities are located within the parking lots of each of the businesses
along Kensington Boulevard. City Staff has spoken with the property owners at 20777
Kensington Boulevard about the possibility of replacing a portion of the substandard
private storm sewer within their parking lot in conjunction with the City’s improvement
project. A final determination as to whether or not those property owners will opt to
improve their private system in conjunction with the City’s project will be made once bid
prices for the project are received. The property owners at 20777 Kensington Boulevard
will be responsible for 100% of the costs associated with replacing the private storm
sewer.
2.3.3 Water Main
The majority of the existing water main located within the Kensington Boulevard
Improvement Project is 12-inch ductile iron pipe (DIP). South of the intersection with
210th Street/Kenrick Avenue, 20-inch DIP exists. The utilities along Kensington
Boulevard were installed in two phases during the mid-to-late-1990’s. Maintenance
records indicate there have been zero recorded water main break along Kensington
Boulevard since the watermain was installed.
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 6
Soil samples were collected with the geotechnical borings late last fall to test for
corrosivity in the soils (pH, oxidation-reduction, electrical resistivity, chloride content,
and sulfate content) to determine if the native soils may contribute to the future failure of
iron water main pipe in this area. The results of the corrosivity testing indicate that the
soils are mildly corrosive. A summary of the corrosivity testing results can be found in
Appendix D.
2.3.4 Sanitary Sewer
The sanitary sewer located within the Kensington Boulevard Improvement Project
consists of 8-inch polyvinylchloride pipe (PVC).
In the Fall of 2014, the City’s Public Works Department televised the sanitary sewer and
inspected all of the sanitary sewer manholes. None of the existing manholes were
installed with chimney seals as a means of mitigating inflow and infiltration (I/I) at the
manholes.
2.3.5 Wetlands
No wetland impacts are anticipated with the proposed improvement project.
2.4 Proposed Improvements
2.4.1 Roadway Surface
Surface improvements proposed with the Kensington Boulevard Improvement Project
include the full-depth reclamation of the roadway and spot curb and gutter replacement.
Reclamation is the process by which the existing deteriorating roadway surface is reused
as aggregate roadway base for the new street section. Full-depth reclamation has shown
to be an effective means by which to address pavement tenting issues, as the reclamation
process redistributes high concentrations of road de-icing chemicals that may have
accumulated within the upper roadway base section.
The street grades are proposed to very closely match the existing grades so as to minimize
curb replacement needs and construction impacts to adjacent properties. Structurally
deficient curb and gutter will be replaced in-kind in conjunction with the project where
necessary.
Kensington Boulevard will be reclaimed and reconstructed to the City’s collector roadway
design standard, and are proposed to consist of the following minimum section: 2-inches
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 7
of bituminous wearing course, 2-inches of bituminous base course, and 6-inches of
reclaimed aggregate base over 36-inches of an acceptable, compacted select granular
subgrade. Kensington Boulevard will be reconstructed to match the existing roadway
width, which generally measures 28-feet (from face-of- boulevard curb to face-of-median
curb) where center medians exist, and 52-feet where no center medians exist.
Where trees had previously been removed from the boulevard and median areas, but not
replaced, the stumps will be ground-out and replaced with sod as a part of the Kensington
Boulevard Street Improvement Project. No new boulevard or median trees will be
installed as a part of this project.
All existing pedestrian curb ramps within the project area will be brought up to current
ADA accessibility design standards as a part of the Kensington Boulevard Improvement
Project.
Special Assessments to benefitting properties are proposed to fund 40% of the surface
improvements identified for the project, with the remaining 60% funded using City Street
and Utility Funds.
2.4.2 Storm Sewer
Manholes, manhole castings, and catch basin castings are also proposed to be
repaired/replaced as-needed to meet current City storm sewer standards as a part of the
Kensington Boulevard Improvement Project.
Special Assessments to benefitting properties are proposed to fund 40% of the storm
sewer improvements identified for the project with the remaining 60% funded using City
Street and Utility Funds.
As mentioned in Section 2.3.2, a final determination as to whether or not those property
owners will opt to improve their private system in conjunction with the City’s project will
be made once bid prices for the project are received. The property owners at 20777
Kensington Boulevard will be responsible for 100% of the costs associated with replacing
the private storm sewer.
2.4.3 Water Main Improvements
The geotechnical investigation performed by Braun Intertec in the fall of 2014 included
the collection of soil samples from within the Kensington Boulevard Improvement
Project area to measure the corrosivity of the soils within select areas of the project. The
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 8
results of the corrosivity testing indicate the project area does contain some moderately
corrosive soils that impact iron water main pipe. It is proposed that in conjunction with
the street improvements identified for Kensington Boulevard, cathodic protection should
be installed along the length of the watermain in an effort to protect the existing DIP
watermain pipe from corrosion. With cathodic protection, sacrificial anodes are installed
along the length of the watermain pipe. These anodes will work to “protect” the
watermain pipe, as the sacrificial metal will corrode instead of the ferrous material to
which it is attached.
Manufacturers of cathodic protection technology suggest that the typical life expectancy
for a sacrificial anode is 20-years, however, there are many cathodic protection systems
that have functioned in excess of 30-years. While installation of cathodic protection does
not guarantee the complete absence of watermain breaks, research has shown that the
installation of sacrificial anodes will significantly reduce the number of breaks over the
life of the pipe. The installation of cathodic protection will help to maintain the integrity
of the existing watermain pipe until such time as the roadway is completely reconstructed
and the watermain pipe is replaced.
Special Assessments to benefitting properties are proposed to fund 40% of the surface
water main improvements (i.e. new valve boxes and valve box adjustments) with the
remaining water main costs (i.e. cathodic protection installation) funded using City
Utility Funds.
2.4.4 Sanitary Sewer Improvements
All sanitary sewer manholes within the project area were identified as needing new rings
and/or castings, and will be repaired as a part of this project. Additionally, all six (6)
sanitary sewer manholes within the project area will receive external chimney seals as a
part of the project to reduce the potential for inflow and infiltration (I & I) issues and
reduce the frequency of maintenance repairs.
The proposed improvements are considered routine maintenance, and therefore, the
costs associated with the sanitary sewer manhole ring/casting replacements are included
in the surface improvement costs, which are proposed to be funded using a combination
of Special Assessments to benefitting property owners (40%) and City Funds (60%). The
installation of chimney seals will be funded using City Utility Funds.
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 9
2.4.5 Street Sign Replacement
All existing street signs within the project will be replaced with new street signs that meet
the Federal Highway Administration’s (FHWA) requirements for retro-reflectivity.
Special Assessments to benefitting properties are proposed to fund 40% of the street sign
improvements identified for the project with the remaining 60% funded using City Street
Funds.
2.4.6 Street Lights
Those shoebox fixture street lights located along the south end of Kensington Boulevard,
within the Office Park zoning district, are some of the few remaining street lights that
area owned and maintained by the City of Lakeville. Those street lights were salvaged
from the CSAH 50 improvement project, and reinstalled along Kensington Boulevard.
The lights are aged and have been the source of on-going maintenance issues along this
segment of Kensington Boulevard.
As a part of the Kensington Boulevard Improvement Project, it is proposed to remove the
existing City-owned street lights and have the electric service provider in that area, Xcel
Energy, install new street lights that will be owned and maintained by Xcel Energy.
Special Assessments to benefitting properties are proposed to fund 40% of the street light
improvements identified for the project with the remaining 60% funded using City Street
Funds.
2.4.7 Mailbox Impacts
No mailboxes are located within the Kensington Boulevard right-of-way, and therefore,
no impacts to mail delivery are anticipated.
2.4.8 Permits/Approvals
An NPDES permit for construction activity will be required since more than one (1) acre
will be disturbed by construction activities with the project.
2.4.9 Construction Access/Staging
The contractor will be responsible for providing access to all properties throughout the
project. Adequately signed detours will be identified to direct traffic around the
construction zones and notify users of the increased truck and construction activity.
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 10
Construction will take place under traffic. Construction will likely be phased such that ½
of the divided roadway is constructed at a time, and traffic is reduced to one travel lane in
each direction during construction. Detailed construction phasing plans will be
developed with final design of the project.
2.4.10 Public Involvement
A project notification letter was mailed to those five property owners that would be
specially assessed for the proposed improvements on November 6, 2014. The letter
identified the street improvements scheduled for 2015, advised property owners that a
public hearing notice for the project would be mailed to them in early 2015 and invited
them to contact City Staff with any questions that they had in the meantime. To-date,
Staff has only received one call regarding the project.
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 11
3. FINANCING
3.1 Opinion of Cost
Detailed opinions of cost for the various project areas can be found in Appendix B of this report.
The opinions of cost incorporate estimated 2015 construction costs and include a 10%
contingency factor. Indirect costs are projected at 28% of the construction cost and include
engineering, legal, financing, and administrative costs.
Table 2 below provides a summary of the opinions of probable cost for the Kensington
Boulevard Improvement Project.
Table 2 – Kensington Boulevard Street Improvement Project
Summary of Cost
Schedule Amount
Schedule A – Surface Improvements $755,270
Schedule B – Sanitary Sewer Improvements $5,490
Schedule C – Water Main Improvements $71,460
Schedule D – Storm Sewer Improvements $66,020
TOTAL $898,240
3.2 Funding
Financing for the Kensington Boulevard Improvement Project will come from City Funds and
Special Assessments.
The installation of cathodic protection for the water main along Kensington Boulevard is
proposed to be financed by the City’s Water Operating Fund. As the remaining proposed utility
improvements are all considered routine maintenance, the costs associated with the sanitary
sewer manhole ring/casting replacements and water main gate valve box repairs are included in
the surface improvement costs, which are proposed to be funded using a combination of Special
Assessments to benefitting property owners (40%) and City Funds (60%). Special Assessments to
benefitting properties are also proposed to fund 40% of the roadway surface and storm sewer
improvements identified to be reconstructed for the project, with the remaining 60% funded
using City Funds. Assessments for this project were calculated on a per front foot basis as
identified in the City’s Assessment Policy.
The total front footage within the Kensington Boulevard Improvement Project is 6,403.23 linear
feet, which includes both sides of the roadway. Of that, only 2,331.39 linear feet are considered
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 12
assessable, as the remaining footage includes properties whose driveway access is located along
another street (i.e. the rear lots of properties located within St. Francis Woods; the side lot of the
property at 20890 Kenbridge Court). So the total project costs would be prorated to reflect only
the assessable front footage:
$834,946 * 2,331.39 linear feet/ 6,403.23 linear feet = $304,000
and
$304,000 * 40% = $121,600
Therefore,
$121,600 / 2,331.39 linear feet = $ 52.16 / LF
The funding level anticipated through the levy of Special Assessments to benefitting property
owners for street improvements is $121,600 with the following proposed assessments:
Front Foot Assessment Rate ...................................................................... $52.16 per front foot
The proposed assessment roll is included in Appendix C of this report, along with an Assessment
Map ID highlighting the benefitting properties and the assessment calculations for benefitting
property owners.
Total Surface, Water
Main (Excluding
Cathodic Protection)
and Sanitary Sewer
Costs
Assessable/Total
Front Footage
Prorated Project Costs
Prorated Project Costs
Assessable
Share of Costs
Total Amount Assessed
Total Amount
Assessed
Assessable Front
Footage
Front Foot
Assessment Rate
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 13
Table 3 – Kensington Boulevard Street Improvement Project
Funding Summary
Funding Source Amount
Street and Storm Sewer Assessments $121,600
City Water Funds $63,295
City CIP Funds $713,345
TOTAL $898,240
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 14
4. PROJECT SCHEDULE
The proposed project schedule for the Kensington Boulevard Improvement Project is as follows:
Project Open House ..................................................................................... November 17, 2014
Order Feasibility Report .................................................................................. December 1, 2014
Accept Feasibility Report/Set Public Hearing .............................................. February 17, 2015
Public Hearing/Order Project/Authorize Ad for Bids ..................................... March 16, 2015
Open Bids/Compute Assessments ........................................................................ April 24, 2015
Declare Costs/Set Assessment Hearing ................................................................... May 4, 2015
Assessment Hearing .................................................................................................. June 1, 2015
Award Construction Contract ................................................................................. June 1, 2015
Begin Construction* ..................................................................................................... June, 2015
Final Completion… ............................................................................................ September, 2015
Certify Assessments to County .......................................................................... December 2015
* Schedule assumes any necessary private utility work is completed prior to start of
construction.
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
Page 15
5. FEASIBILITY AND RECOMMENDATION
The Kensington Boulevard Improvement Project includes roadway reclamation, spot curb and
gutter replacement of structurally deficient concrete and the installation of new street lights
within southern portion of the project. Structurally deficient storm and sanitary sewer manholes
and water main valves identified by the City’s Public Works Department will also be replaced as a
part of this project. In addition, cathodic protection is proposed to be installed along all of the
watermain located within the project limits in an effort to limit the corrosion of the existing
ductile iron watermain pipe (DIP) located beneath Kensington Boulevard, as soil testing has
revealed the soils in this area are moderately corrosive.
The total estimated cost for the Kensington Boulevard Improvement Project including roadway,
sidewalk, storm sewer, sanitary sewer, and water main improvements is $898,240.00. Proposed
funding for the project is provided through a combination of Special Assessments and City
Funds.
This project is feasible, necessary, and cost-effective from an engineering standpoint. The project
feasibility is subject to financial review by the City. Based on the information contained in this
report, it is recommended to proceed with the improvements as outlined in this report.
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
APPENDIX A
Figure 1: Location Map
205TH ST W
K A I S E R W A Y
JUTLAND P L
J
U
P
ITER PATH
KENBRIDGE CT
KAFTAN C T
KENRIC
K
A
V
E
21 0TH S T W
K E A R N E Y
P A T H
KAISER
W
A
Y
456770
K
ALMEADO WCT
JU
N
I
P
E
R
WA
Y
JU
R
A
T
R
L
K
ENS I N G T O N W A Y
210THSTW
K
E
N
S
I
N
G
T
O
N
B
L
V
D
KensingtonBoulevardImprovementProject
Project Location
²
0 400 800200Feet
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
APPENDIX B
Opinion of Probable Cost
PROJECT:
Item Unit Quantity Est. Unit Price Estimated Cost
SCHEDULE A - SURFACE IMPROVEMENTS
MOBILIZATION LS 1 30,066.70$ 30,066.69$
TRAFFIC CONTROL LS 1 10,000.00$ 10,000.00$
RECLAIM BITUMINOUS SQ YD 20,875 3.00$ 62,625.00$
REMOVE & REPLACE CONCRETE CURB (ALL TYPES) LF 2,370 5.00$ 11,850.00$
REMOVE BITUMINOUS (DRIVEWAYS) SQ YD 260 6.00$ 1,560.00$
REMOVE BITUMINOUS WALK SF 3,280 2.00$ 6,560.00$
REMOVE CONCRETE WALK SF 825 2.00$ 1,650.00$
REMOVE CONCRETE VALLEY GUTTER SY 40 9.00$ 360.00$
REMOVE SIGNS EACH 26 50.00$ 1,300.00$
REMOVE STREET LIGHTS EACH 13 769.23$ 10,000.00$
REMOVE TREE TREE 15 180.00$ 2,700.00$
STUMP GRINDING TREE 22 100.00$ 2,200.00$
SAWING PAVEMENT (FULL DEPTH ALL TYPES) LIN FT 325 3.00$ 975.00$
MILL BITUMINOUS STEP JOINT LIN FT 325 2.00$ 650.00$
SUBGRADE EXCAVATION CU YD 400 26.66$ 10,664.00$
AGGREGATE BASE CLASS 5 - (PATCHING) TON 100 20.00$ 2,000.00$
FOUNDATION MATERIAL (3" MINUS) TON 50 12.21$ 610.50$
WEARING COURSE MIXTURE SPWEA340C TON 2,360 45.00$ 106,200.00$
NON WEARING COURSE MIXTURE SPNWB330C TON 2,360 45.00$ 106,200.00$
WEARING COURSE MIXTURE SPWEA240B-DRIVEWAY SY 260 25.00$ 6,500.00$
6" CONCRETE W/SAND SY 40 50.00$ 2,000.00$
7" CONCRETE VALLEY GUTTER SY 40 57.00$ 2,280.00$
2.5" BITUMINOUS WALK SF 2,980 3.00$ 8,940.00$
PEDESTRIAN CURB RAMP EACH 23 180.00$ 4,140.00$
TRUNCATED DOMES SF 368 35.00$ 12,880.00$
SODDING, TYPE LAWN (INCL. TOPSOIL & FERT) SY 1,200 5.00$ 6,000.00$
REPAIR SPRINKLER SYSTEM EACH 14 300.00$ 4,200.00$
STREET SIGNS LS 1 4,359.00$ 4,359.00$
ADA COMPLIANCE SUPERVISOR LS 1 1,000.00$ 1,000.00$
INSTALL STREET LIGHTS LS 1 113,267.70$ 113,267.70$
PAVEMENT MESSAGE (RIGHT ARROW) - PAINT EACH 2 80.00$ 160.00$
PAVEMENT MESSAGE (LEFT ARROW) - PAINT EACH 3 80.00$ 240.00$
PAVEMENT MESSAGE (LEFT STRAIGHT ARROW) - PAINT EACH 1 110.00$ 110.00$
24" SOLID LINE WHITE - PAINT LIN FT 25 6.00$ 150.00$
24" SOLID LINE YELLOW - PAINT LIN FT 85 6.00$ 510.00$
4" SOLID LINE WHITE - PAINT LIN FT 1,100 0.10$ 110.00$
4" WHITE SKIP - PAINT LIN FT 1,130 0.15$ 169.50$
4" SOLID LINE YELLOW - PAINT LIN FT 545 0.15$ 81.75$
4" DOUBLE SOLID LINE YELLOW - PAINT LIN FT 1,660 0.15$ 249.00$
CROSS WALK STRIPING - PAINT SF 255 3.50$ 892.50$
SUBTOTAL:536,410.64$
SCHEDULE B - SANITARY SEWER IMPROVEMENTS
ADJUST FRAME & RING CASTING SANITARY SEWER EACH 6 500.00$ 3,000.00$
EXTERNIAL CHIMNEY SEALS EACH 6 150.00$ 900.00$
SUBTOTAL:3,900.00$
KENSINGTON BOULEVARD (15-04)
205TH STREET TO 210TH STREET
PRELIMINARY
DESCRIPTION:
PROJECT:
Item Unit Quantity Est. Unit Price Estimated Cost
OPINION OF PROBABLE COST
KENSINGTON BOULEVARD (15-04)
205TH STREET TO 210TH STREET
PRELIMINARY
DESCRIPTION:
SCHEDULE C - WATER MAIN IMPROVEMENTS
CATHODIC PROTECTION LF 3,100 14.50$ 44,950.00$
ADJUST VALVE BOX EACH 10 300.00$ 3,000.00$
ADJUST VALVE BOX & TOP SECTION EACH 2 400.00$ 800.00$
ADJUST VALVE BOX & TOP & MID SECTION EACH 2 500.00$ 1,000.00$
RECONSTRUCT VALVE BOX EACH 1 1,000.00$ 1,000.00$
SUBTOTAL: 50,750.00$
SCHEDULE C - STORM SEWER IMPROVEMENTS
REMOVE PVC DRAIN TILE LF 150 2.00$ 300.00$
REMOVE STROM SEWER STRUCTURE ( ALL TYPES) EACH 2 500.00$ 1,100.00$
REMOVE 12" PVC SDR 26 LF 32 10.00$ 320.00$
4" PERFORATED DRAINTILE LF 150 15.00$ 2,250.00$
CONNECT TO EX STORM EACH 1 200.00$ 200.00$
CB 2 X 3 EACH 1 1,500.00$ 1,500.00$
CBMH EACH 1 2,000.00$ 2,000.00$
12" PVC SDR 26 LF 32 30.00$ 960.00$
ADJUST FRAME & RING CASTING STORM SEWER EACH 32 500.00$ 16,000.00$
FLEX SEAL INTERNAL CHIMMY SEAL EACH 34 500.00$ 17,000.00$
MUD DOG HOUSE EACH 17 280.00$ 4,760.00$
CASTING ASSEMBLY STORM SEWER EACH 1 500.00$ 500.00$
SUBTOTAL: 46,890.00$
SUBTOTAL CONSTRUCTION COST 637,950.64$
CONTINGENCY (10%)63,795.06$
CONSTRUCTION SUBTOTAL 701,745.70$
28% INDIRECT 196,488.80$
TOTAL PROJECT COSTS 898,234.50$
Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
APPENDIX C
Assessment Map ID
Preliminary Assessment Roll
JUPI T E R C T
205TH ST W
J
U
P
I TE
R C I R
JUPITERPATH
KALMEADOW C T
210THSTW
K
E
N S F I E L D
T
R
L
KENBRIDGE CT
KAFTAN C T
J U T L A N D P L
KENRIC
K
A
V
E
JU
N
I
P
E
R
W
A
Y
210TH ST W
KENS I N G T O N W A Y
K A I S E R W A Y
K E N S I N G T O N B L V D
K E A R NE
Y
P A T H
J U R A TR L
5
24
3
1
2015 Kensington BoulevardImprovement ProjectParcel Assessment
Project Location
Assessment Parcels ²
0 400 800200Feet
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Date: 2/11/2015
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1
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EXEMPT 690.14 52.16 $ $35,996.14
2
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Feasibility Report
Kensington Boulevard Improvement Project
City Project No. 15-04
APPENDIX D
2014 Geotechnical Report – Log of Test Boring
Corrosivity Test Results
7
10 33 10
PAV
SP-
SM
FILL
FILL
5 1/2 inches of bituminous.
POORLY GRADED SAND with SILT, fine- to medium-grained,
with Gravel, light brown, moist.
FILL: Clayey Sand, brown, moist to wet
FILL: Clayey Sand, brown, moist.
END OF BORING.
Water not observed while drilling.
Water not observed to cave-in depth of 4 feet.
Boring then backfilled.
0.5
2.0
4.0
6.0
9/3/14 1" = 4'DATE:SCALE:DRILLER:
Tests or NotesWL
Braun Intertec Corporation, Bloomington MN 55438 ST-1 page 1 of 1
3 1/4" HSA, AutohammerS. McLean
L O G O F B O R I N G
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(Soil-ASTM D2488 or D2487, Rock-USACE EM1110-1-2908)
Description of Materials
ST-1
METHOD:
BORING:
BPF
B14-06266LO
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Braun Project B14-06266
GEOTECHNICAL EVALUATION
Kensignton Boulevard and Hamburg Avenue
Lakeville, Minnesota
P200
%
MC
%Symbol
Depth
feet
0.0
11
11
10
8
PAV
SP-
SM
FILL
CL
CL
4 1/2 inches of bituminous.
POORLY GRADED SAND with SILT, fine- to medium-grained,
trace Gravel, brown, moist.
FILL: Sandy Lean Clay, dark brown, moist.
SANDY LEAN CLAY, reddish brown, moist, rather stiff.
(Glacial Till)
SANDY LEAN CLAY, brown, moist to wet, medium to rather
stiff.
(Glacial Till)
END OF BORING.
Water not observed while drilling.
Water not observed to cave-in depth of 8 feet.
Boring then backfilled.
0.4
2.0
4.0
7.0
11.0
9/3/14 1" = 4'DATE:SCALE:DRILLER:
Tests or NotesWL
Braun Intertec Corporation, Bloomington MN 55438 ST-2 page 1 of 1
3 1/4" HSA, AutohammerS. McLean
L O G O F B O R I N G
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sketch.
(Soil-ASTM D2488 or D2487, Rock-USACE EM1110-1-2908)
Description of Materials
ST-2
METHOD:
BORING:
BPF
B14-06266LO
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Braun Project B14-06266
GEOTECHNICAL EVALUATION
Kensignton Boulevard and Hamburg Avenue
Lakeville, Minnesota
Symbol
Depth
feet
0.0
8
10
PAV
SP-
SM
FILL
6 inches of bituminous.
POORLY GRADED SAND with SILT, fine- to medium-grained,
trace Gravel, brown, moist.
FILL: Sandy Lean Clay, brown to dark brown, moist.
NOTE: This boring is in between watermain and
stormsewer-could be in utility trench.
END OF BORING.
Water not observed while drilling.
Water not observed to cave-in depth of 4 feet.
Boring then backfilled.
0.5
2.0
6.0
9/3/14 1" = 4'DATE:SCALE:DRILLER:
Tests or NotesWL
Braun Intertec Corporation, Bloomington MN 55438 ST-3 page 1 of 1
3 1/4" HSA, AutohammerS. McLean
L O G O F B O R I N G
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LOCATION: Kensington Boulevard. See attached
sketch.
(Soil-ASTM D2488 or D2487, Rock-USACE EM1110-1-2908)
Description of Materials
ST-3
METHOD:
BORING:
BPF
B14-06266LO
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1
5
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:
4
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Braun Project B14-06266
GEOTECHNICAL EVALUATION
Kensignton Boulevard and Hamburg Avenue
Lakeville, Minnesota
Symbol
Depth
feet
0.0
6
6
16
15
53 12
PAV
FILL
CL
5 inches of bituminus over 8 inches of aggregate base.
FILL: Sandy Lean Clay, brown, moist, stiff.
SANDY LEAN CLAY, reddish seams, light brown, moist.
(Glacial Till)
END OF BORING.
Water not observed while drilling.
Water not observed to cave-in depth of 8 feet.
Boring then backfilled.
1.1
7.0
11.0
9/3/14 1" = 4'DATE:SCALE:DRILLER:
Tests or NotesWL
Braun Intertec Corporation, Bloomington MN 55438 ST-4 page 1 of 1
3 1/4" HSA, AutohammerS. McLean
L O G O F B O R I N G
(S
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D
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)
LOCATION: Kensington Boulevard. See attached
sketch.
(Soil-ASTM D2488 or D2487, Rock-USACE EM1110-1-2908)
Description of Materials
ST-4
METHOD:
BORING:
BPF
B14-06266LO
G
O
F
B
O
R
I
N
G
N
:
\
G
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1
4
\
0
6
2
6
6
.
G
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B
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A
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_
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8
_
C
U
R
R
E
N
T
.
G
D
T
2
/
6
/
1
5
1
0
:
4
0
Braun Project B14-06266
GEOTECHNICAL EVALUATION
Kensignton Boulevard and Hamburg Avenue
Lakeville, Minnesota
P200
%
MC
%Symbol
Depth
feet
0.0
9
13
51 13
PAV
CL
5 inches of bituminous over 6 inches of aggregate base.
SANDY LEAN CLAY, brown, moist, rather stif to stiff.
(Glacial Till)
END OF BORING.
Water not observed while drilling.
Water not observed to cave-in depth of 4 feet.
Boring then backfilled.
0.9
6.0
9/3/14 1" = 4'DATE:SCALE:DRILLER:
Tests or NotesWL
Braun Intertec Corporation, Bloomington MN 55438 ST-5 page 1 of 1
3 1/4" HSA, AutohammerS. McLean
L O G O F B O R I N G
(S
e
e
D
e
s
c
r
i
p
t
i
v
e
T
e
r
m
i
n
o
l
o
g
y
s
h
e
e
t
f
o
r
e
x
p
l
a
n
a
t
i
o
n
o
f
a
b
b
r
e
v
i
a
t
i
o
n
s
)
LOCATION: Kensington Boulevard. See attached
sketch.
(Soil-ASTM D2488 or D2487, Rock-USACE EM1110-1-2908)
Description of Materials
ST-5
METHOD:
BORING:
BPF
B14-06266LO
G
O
F
B
O
R
I
N
G
N
:
\
G
I
N
T
\
P
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O
J
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C
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S
\
A
X
P
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O
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E
C
T
S
\
2
0
1
4
\
0
6
2
6
6
.
G
P
J
B
R
A
U
N
_
V
8
_
C
U
R
R
E
N
T
.
G
D
T
2
/
6
/
1
5
1
0
:
4
0
Braun Project B14-06266
GEOTECHNICAL EVALUATION
Kensignton Boulevard and Hamburg Avenue
Lakeville, Minnesota
P200
%
MC
%Symbol
Depth
feet
0.0
Kensington Boulevard
Sample
Depth Resistivity
Redox
Potential
(ft)(ohm-cm)(mV)POINTS
ST-2A 4-7 Sandy CL 1,672 6.8 107 None MOIST 9
ST-4A 7-11 Sandy CL 498 6.9 125 None MOIST 11
Location Classification pH MoistureSulfides