HomeMy WebLinkAbout09A 2017 Pavement Management Project - Public Hearing, Order Project, and Authorize Preparation of Plans & Specifications
City Council
Action Request Form
Meeting Date
9/7/2016
Department
Community Development
Agenda Category
Public Hearings
Title
2017 Pavement Management Project – Public Hearing, Order
Project, and Authorize Preparation of Plans & Specifications
Staff Recommendation
1) Hold the Public Hearing
2) Adopt Resolution No. 2016-XXX ordering the 2017 Pavement Management Project and authorizing
the preparation of plans and specifications for Districts B1 and F3
Budget Implication
Attachments
Council Memo
Resolution No. 2016-XXX
Feasibility Report
To: Honorable Mayor and City Council
Charlene Stevens, City Administrator
From: Jennifer Levitt, P.E., Community Development Director/City Engineer
Ryan Burfeind, P.E., Project Engineer
Date: September 1, 2016
Re: 2017 Pavement Management Project
Hold Public Hearing
Order Project
Authorize Preparation of Plans and Specifications
Background
On June 1, 2016, the City Council authorized a feasibility report for the 2017 Pavement
Management Project as outlined in the Capital Improvement Plan (CIP) for the following areas:
1) A portion of the B1 residential area (Rolling Hills) generally bound by streets north of
Crestview Elementary and Park High School, east of Hinton Avenue, west of North
Ideal Park and Nina’s Park, and south of 75th Street.
2) A portion of the F3 residential area (Jamaica Ridge) generally bound by streets north
of East Meadow Cliff Ravine, east of Jamaica Ave, south of 80th Street, and west of
Jeffery Ave.
3) The C3 residential area (Prestige Estates) generally bound by streets north of 80th
Street, east of Kingston Park, and west of Cottage Grove Trail Way Corridor.
Information regarding the proposed improvements and assessments were presented to the City
Council on August 3, 2016. Due to the poor pavement condition, along with good sub-grade
soils and curb condition, a full pavement replacement and spot curb replacement were recom-
mended for the Jamaica Ridge residential area. In the Rolling Hills neighborhood there were two
different rehabilitation methods proposed. In the 3rd, 6th, and 7th Additions, a full pave-
ment/spot curb replacement was proposed similar to Jamaica Ridge, due to the poor pavement
condition and good sub-grade soils and curb condition. With the poor pavement and curb condi-
tion, a full pavement replacement and full curb replacement, along with replacement of the
street light wires with conduit were proposed in the Rolling Hills 4th and 5th Additions. Due to
increased costs related to the full curb replacement in Rolling Hills, rehabilitation of the streets in
Prestige Estates is recommended to be postposed to maintain a project cost as outlined in the
Capital Improvement Plan.
A neighborhood meeting for this project was held on August 4, 2016, at 7:00 p.m. at the Cottage
Grove City Hall. There were 18 people in attendance. At this meeting a presentation was given
highlighting the various improvements proposed for the 2017 project, along with information on
the proposed assessments.
Honorable Mayor, City Council, and Charlene Stevens
2017 Pavement Management Project
September 1, 2016
Page 2 of 3
On August 10, 2016, the City Council approved the feasibility report and called for a public
hearing to be held on September 7, 2016. All notices and publications have been completed
according to State Statute.
Discussion
Summary of Road and Infrastructure Improvements
The rehabilitation method proposed for the residential streets in the Jamaica Ridge area is to
remove the existing asphalt surface and replace it with a new surface, which will consist of two
lifts of bituminous. Spot curb replacement throughout the area will also be completed. Finally,
minor utility improvements for sanitary sewer, water, street lights, and stormwater will also be
included. The total estimated project cost for the Jamaica Ridge residential area is $714,599.
The potential assessment for the improvements listed above is estimated at $3,504.51 per resi-
dential buildable lot equivalent (RBLE). Single-family residential is assessed at a rate of 1.0 of
the RBLE. The 2015 special benefit appraisal for similar improvements was $5,000, which
supports the proposed assessment.
The rehabilitation method proposed for the residential streets in the Rolling Hills 3rd, 6th, and
7th Additions are similar to Jamaica Ridge, involving the removal of the existing asphalt surface
and replacing it with a new surface, which will consist of two lifts of bituminous. Spot curb re-
placement throughout the area will also be completed. Finally, minor utility improvements for
sanitary sewer, water, street lights, and stormwater will also be included. The total estimated
project cost for the Rolling Hills 3rd, 6th, and 7th Additions is $626,397. The potential assess-
ment for the improvements listed above is estimated at $3,193.72 per residential buildable lot
equivalent (RBLE). Single-family residential is assessed at a rate of 1.0 of the RBLE. The 2015
special benefit appraisal for similar improvements was $5,000, which supports the proposed
assessment.
The rehabilitation method proposed for the residential streets in the Rolling Hills 4th and & 5th
Additions is to remove the existing asphalt surface and replace it with a new surface, which will
consist of two lifts of bituminous. Due to the poor condition, full curb replacement is also pro-
posed to be completed. A 28-inch wide surmountable curb and gutter section is proposed in
place of the existing 24-inch wide surmountable curb and gutter. Due to the age of the street
light system in conjunction with the full curb replacement, placement of new street light wiring in
conduit is proposed. Finally, minor utility improvements for sanitary sewer, water, and storm-
water will also be included within the project area. The total estimated project cost for the Rolling
Hills 4th and 5th Additions is $609,801. The potential assessment for the improvements listed
above is estimated at $4,997.73 per residential buildable lot equivalent (RBLE). Single-family
residential is assessed at a rate of 1.0 of the RBLE. The 2015 special benefit appraisal for simi-
lar improvements was $5,100, which would support the proposed assessment.
Project Funding Analysis
The total project cost for the road and utility work is $1,950,797. According to the City’s policy,
45 percent of the total project cost for road work and utilities is assessed against the benefiting
residential properties. The total project value that is assessed is $852,062. The Cost Estimate
Summary can be viewed in Appendix C of the Feasibility Report.
Honorable Mayor, City Council, and Charlene Stevens
2017 Pavement Management Project
September 1, 2016
Page 3 of 3
Project Option Discussion
Option #1: Order the project as outlined in the feasibility report.
Total estimated project cost – $1,950,797
Total anticipated assessments – $852,062
The benefit of proceeding with the project is that soliciting for bids this winter will provide a
stable bidding environment, which reduces the burden to the general taxpayers and the resi-
dents adjacent to the project who are paying assessments. Another result of the new pavement
is reduced maintenance costs associated with the streets in the project area. Those mainte-
nance dollars and resources can then be reallocated to other parts of the community, which is a
greater benefit to the general taxpayer. There are also similar benefits related to the repairs to
the utilities in the project area.
The CIP outlines a fiscally responsible plan to rehabilitate roads and utilities within the commu-
nity and provide for park improvements. Past policy is to do park improvements/upgrades with
the neighborhood street and utility improvements. By ordering the project, those plans stay true
to that document and the Council’s direction given in the development of the CIP.
Option #2: Do not order the project as outlined in the feasibility report.
If the improvements related to the 2017 Pavement Management Project are not ordered, the
roads will continue to deteriorate, which will result in increased maintenance costs. Those costs
are borne by all taxpayers, not just the property owners that live on those streets. Future project
costs will also be increased by 2.5 percent to 8 percent annually as a result of the construction
index. When a pavement management project is delayed, it creates a domino effect by delaying
all future pavement management projects. The cost of the domino effect is hard to capture,
since there are pavement management projects planned each year into the future. The City’s
approach since 1994 has been to ensure a safe condition and preserve the structural integrity of
roads in a fiscally responsible manner. Independent third party benefit appraisals conducted
since 2007 have concluded that this program improves property values within the project areas,
as compared to the existing deteriorated condition.
It should be noted to Council per Minnesota State Statute 429.031 that the resolution
must be adopted by four-fifths vote for the project to be ordered and the project to
proceed.
Recommendation
It is recommended the City Council adopt a resolution ordering the 2017 Pavement Manage-
ment project and authorize preparation of plans and specifications for Districts B1 & F3.
RESOLUTION NO. 2017-XXX
A RESOLUTION ORDERING THE PROJECT AND AUTHORIZING
PREPARATION OF PLANS AND SPECIFICATIONS FOR THE
2017 PAVEMENT MANAGEMENT PROJECT AREAS
(PORTION OF DISTRICT F-3 AND PORTION OF DISTRICT B-1)
WHEREAS, a resolution of the City Council adopted on August 10, 2016, fixed a date for
the Council to hold a public hearing, pursuant to Minn. Stat. Chapter 429.011 to 429.111, on the
proposed improvement benefitting properties that include:
Rolling Hills Neighborhood (Portion of District B-1)
1) Homestead Avenue South from 77th Street South to 76th Street South
2) Homestead Avenue South from 76th Street South to cul-de-sac (7542-7596)
3) Homestead Avenue South from Homestead Avenue South to cul-de-sac (7565-
7573)
4) 76th Street South from Homestead Avenue South to Hyde Avenue South
5) Homestead Court South from Homestead Avenue South to cul-de-sac (7631-7697)
6) 77th Street South from Homestead Avenue South to Hyde Avenue South
7) 77th Street South from Hyde Avenue South to approximately 180 LF east of 77th
Street Court South
8) 77th Street Bay South from 77th Street South to cul-de-sac (7893-7937)
9) 77th Street Court South from 77th Street South to cul-de-sac (7957-7997)
10) Hyde Avenue South from 77th Street South to 76th Street South
11) Hyde Avenue South from Hyde Avenue South to cul-de-sac (7659-7687)
12) Hyde Avenue South from 76th Street South to 75th Street South
Jamaica Ridge Neighborhood (Portion of District F-3)
1) Jasmine Avenue South from Jamaica Avenue South to Upper 81st Street South
2) Upper 81st Street South from Jasmine Avenue South to approximately 170 LF east
of Jasmine Avenue
3) Janero Avenue South from Jasmine Avenue South to Jamaica Avenue South
4) 81st Street South from Janero Avenue South to Jasmine Avenue South
WHEREAS, ten days mailed notice and two weeks published notice of the hearing was
given, and the hearing was held, at which all persons desiring to be heard were given an
opportunity to be heard thereon; and
WHEREAS, the City desires to assess the cost of said improvements to all benefited
properties, other than for properties not proposed for assessment.
NOW THEREFORE BE IT RESOLVED, the City Council of the City of Cottage Grove,
County of Washington, State of Minnesota:
1. Such improvement is necessary, cost-effective, and feasible as detailed in the feasi-
bility report. The improvement shall include road rehabilitation, water, storm sewer,
sanitary sewer, and street lights.
Resolution No. 2016-XXX
Page 2 of 2
2. Such improvement is hereby ordered.
3. Bolton and Menk, Inc. is hereby designated as the engineer for this improvement. The
engineer shall prepare plans and specifications for the making of such improvement.
4. The City Council declares its official intent to reimburse itself for the costs of the
improvement from the proceeds of the tax exempt bond.
Passed this 7th day of September 2016.
Myron Bailey, Mayor
Attest:
Joe Fischbach, City Clerk
Feasibility Reportfor
2017 Pavement Management Project
City of Cottage Grove, Minnesota
August 2016
Project Number N14.111570
August 10, 2016
Honorable Mayor and City Council
City of Cottage Grove
12800 Ravine Parkway South
Cottage Grove, MN 55016
RE: 2017 Pavement Management Project
BMI Project No. N14.111570
Honorable Mayor and City Council Members,
Enclosed for your review is the 2017 Pavement Management Project Feasibility Report. The project
scope includes street rehabilitation and utility repairs within the Rolling Hills, Prestige Estates, and
Jamaica Ridge neighborhoods, as identified in this report.
This report describes the improvements necessary within the project area. Cost estimates for the
proposed improvements are presented in the Report.
We would be happy to discuss this report at your convenience. Please contact me at 651-968-7674 if
you have any questions.
Sincerely,
BOLTON & MENK, INC.
Michael Boex, PE
Table of Contents
Table of Contents ...................................................................................................... i
Certification ............................................................................................................ iii
Introduction ............................................................................................................. 1
Existing Conditions ................................................................................................... 2
Streets ....................................................................................................................... 2
Sanitary Sewer .......................................................................................................... 4
Water Main ............................................................................................................... 4
Storm Sewer .............................................................................................................. 4
Proposed Improvements .......................................................................................... 4
Streets ....................................................................................................................... 4
Walkway .................................................................................................................... 5
Sanitary Sewer .......................................................................................................... 6
Water Main ............................................................................................................... 6
Storm Sewer .............................................................................................................. 6
Storm Water Quality ................................................................................................. 6
Permits and Easements ............................................................................................ 6
Estimated Costs ........................................................................................................ 7
Cost Allocation .......................................................................................................... 7
Financing ................................................................................................................. 10
Public Hearing ........................................................................................................ 10
Project Schedule ..................................................................................................... 10
Conclusion and Recommendations ......................................................................... 10
Tables
Table 1: Existing Street Section ................................................................................. 3
Table 2: Estimated Cost Summary ............................................................................. 7
Table 3: Residential Deductions ................................................................................ 8
Table 4: Residential Cost Allocation .......................................................................... 8
Table 5: Estimated Cost Per Residential Unit ............................................................. 9
Table 6: IMTF Cost Summary ..................................................................................... 9
Table 7: Cost Per Unit Comparison .......................................................................... 11
City of Cottage Grove, Minnesota Table of Contents
2017 Pavement Management Project Page i
Appendix
Appendix A: Existing Pavement Condition Photos ................................................... 13
Appendix B: Figures ................................................................................................ 23
Appendix C: Cost Estimate Summary ....................................................................... 36
Appendix D: Preliminary Assessment Roll ............................................................... 38
Appendix E: Pavement Cores .................................................................................. 44
City of Cottage Grove, Minnesota Table of Contents
2017 Pavement Management Project Page ii
Certification
Feasibility Report
for
2017 Pavement Management Report
City of Cottage Grove, Minnesota
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.
By:
Michael Boex, PE
License No. 44576
Bolton & Menk, Inc.
Date: August 10, 2016
City of Cottage Grove, Minnesota Certification
2017 Pavement Management ProjectPage iii
INTRODUCTION
rdththstnd
Part of the Rolling Hills 3 Addition, the Rolling Hills 4 - 7 Additions, Prestige Estates 1 - 2 Additions,
Prestige Estates on the Park Addition, and Jamaica Ridge 1 st - 2 nd Additions have been identified as
candidates for rehabilitation during the 2017 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 these streets as a part of the 2017 Pavement Management
Project.
The Rolling Hills 3 rd - 7 th Additions are located east of Hinton Avenue and north of 80 th Street. They are
part of Pavement Management District B, as shown on Figure 1.
Prestige Estates 1 st - 2 nd Additions and Prestige Estates on the Park Addition are located north of 80 th
Street and midway between Jamaica Avenue and County Road 19. They are part of Pavement
Management District C, as shown on Figure 1.
stndth
The Jamaica Ridge 1 - 2 Additions are located south of 80 Street and east of Jamaica Avenue. They
are part of Pavement Management District F, as shown on Figure 1.
There are 19 residential streets within these neighborhoods totaling approximately 16,000 lineal feet.
The purpose of this report is to further evaluate the work 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.
This feasibility report examines the following street segments:
Rolling Hills Neighborhood
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1.Homestead Avenue So. from 77 Street So. to 76 Street So.
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2.Homestead Avenue So. from 76 Street So. to cul-de-sac (7542-7596)
3.Homestead Avenue So. from Homestead Avenue So. to cul-de-sac (7565-7573)
4.76 th Street So. from Homestead Avenue So. to Hyde Avenue So.
5.Homestead Court So. from Homestead Avenue So. to cul-de-sac (7631-7697)
6.77 th Street So. from Homestead Avenue So. to Hyde Avenue So.
7.77 th Street So. from Hyde Avenue So. to approximately 180 lf east of 77 th Street Ct.
8.77 th Street Bay So. from 77 th Street So. to cul-de-sac (7893-7937).
9.77 th Street Ct. So. from 77 th Street So. to cul-de-sac (7957-7997).
10.Hyde Avenue So. from 77 th Street So. to 76 th Street So.
11.Hyde Avenue So. from Hyde Avenue So. to cul-de-sac (7659-7687).
12.Hyde Avenue So. from 76 th Street So. to 75 th Street So.
Prestige Estates Neighborhood
1.Jocelyn Avenue So. from 80th Street So. to Jenner Avenue So.
2.79th Street So. loop from Jocelyn Avenue So. to Jocelyn Avenue So.
3.Jenner Avenue So. from 80th Street So. to Jocelyn Avenue So.
City of Cottage Grove, Minnesota Introduction
2017 Pavement Management Project Page 1
Jamaica Ridge Neighborhood
st
1.Jasmine Avenue So. from Jamaica Avenue So. to Upper 81 Street So.
st
2.Upper 81 Street So. from Jasmine Avenue So. to approximately 170 lf east of Jasmine Avenue
3.Janero Avenue So. from Jasmine Avenue So. to Jamaica Avenue So.
4.81 st Street So. from Janero Avenue So. to Jasmine Avenue So.
If the City decides to proceed with the proposed street and utility improvements as described in this
report, it is anticipated construction would begin in 2017 as shown in the detailed project schedule
found on page 10.
EXISTING CONDITIONS
Streets
The streets within these neighborhoods are urban-residential and are generally 32 feet wide (from face
of curb to face of curb) with D412 concrete curb and gutter. However, 76 th Street between Hinton
Avenue and Ideal Avenue is classified as a major and is 44 feet
wide (from face of curb to face of curb). The streets in the Rolling Hills neighborhood were originally
constructed in the mid 1980s through the early 1990s, the Prestige Estates neighborhood in the early
1990s, and the Jamaica Ridge neighborhood in the mid to late 1980s. The in-place pavement section of
these streets
A visual inspection was performed in 2016 to evaluate pavement surface conditions. The inspection
determined the Pavement Condition Index (PCI) of these streets generally ranges from 35-45.
Pavementair and generally have significant or major distress. Figures 2
- 3 depict the age of the streets within the neighborhoods and Figures 4 -5 depict the visual pavement
rating for each street segment. In addition, there are sections of existing curb and gutter that have
settled, cracked, or have other defects that will require replacement. Appendix A contains some
representative photos of the existing pavement condition.
Pothole repairs and skin patch overlays have been performed to keep the road in a drivable and
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relatively smooth condition. In the Rolling Hills 4, 5, 6, and 7 Additions, a seal coat was last
performed in 2011. In the Rolling Hills 3 rd Addition, a seal coat was last performed in 2012. In the
Prestige Estates neighborhood, a seal coat was last performed in 2012. Also, in the Prestige Estates
neighborhood, a temporary skin patch overlay across the entire width of the road was constructed in
pieces in 2012 and 2013 on Jenner Avenue, 79 th Street, and part of Jocelyn Avenue. And in the Jamaica
Ridge neighborhood, a seal coat was last performed in 2010. A significant amount of street maintenance
funds have been used or are anticipated in upcoming maintenance cycles in these areas.
Past experience on recent projects has shown that the pavement cracking pattern on streets of this
general age and condition range extends well below the surface. In fact, the seal coat can help mask the
cracking in some instances.
It should be noted that the visual surface rating is a preliminary indicator of condition and potential
rehabilitation techniques; it should not solely dictate the maintenance or rehabilitation strategy. Factors
such as age, traffic projections, pavement strength, and pavement structure condition should also be
considered.
City of Cottage Grove, Minnesota Existing Conditions
2017 Pavement Management Project Page 2
Coring of the pavement was performed to determine the thickness of the existing street section and
evaluate pavement condition. From the cores, it can be seen that the average section in the
neighborhoods consists of approximately 3.75 inches of bituminous over 8 inches of base. The thicker
than expected bituminous is in part due to multiple seal coat applications or a skin patch overlay, as well
as difficulty in evaluating bituminous depths from the stripped cores.
Table 1: Existing Street Section
Existing Street Section
Bituminous Aggregate
No. Location Condition
(in) Base (in)
Moderate severe stripping,
1 8166 Janero Ave S (F3)
4 10.5
broken
2 8339 Jasmine Ave S (F3) Severe stripping, broken
4 9
3 8085 Jasmine Ave S (F3) Slight moderate stripping
3 8
4 7848 Jenner Ave S (C3) Slight moderate stripping
5 N/A*
th
5 9501 79 St S (C3) Severe stripping, broken
4.5 7.5
6 7901 Jocelyn Ave S (C3) Moderate stripping, broken
4 8.5
th
7 7819 76 St S (B1) Moderate stripping, broken
4 7
8 7680 Hyde Ave S (B1) Moderate stripping
3 8
9 7945 77 th St S (B1) Severe stripping, broken
4 7.5
10 7698 Homestead Ave S (B1) Severe stripping, broken
3.5 7
11 7578 Homestead Ave S (B1) Slight moderate stripping
3.25 8
Average: 3.75 8.0
*Base not consistent with other locations. Soil encountered was granular with no crushed
limestone present.
All eleven cores within the residential neighborhoods displayed some degradation due to stripping.
Stripping is generally described as the separation of aggregate from the asphalt due to moisture. The
stripping found degrades the strength and durability of the pavement. Seven of the cores were noted as
broken, meaning the stripping was severe enough that the top layer of bituminous fell apart as the core
was extracted. The locations of stripping generally coincided with areas where Public Works has
performed extensive maintenance via skin patch overlays and patching, whereas areas with slight
stripping may not be visible at the pavement surface. Pictures of the pavement cores can be seen in
Appendix E.
Due to the granular subgrade soils and good aggregate base, the pavement structure as a whole is
typically structurally sound. Therefore, the issue facing the City is typically functional and not structural
meaning the recurring maintenance issues due to the stripped pavement material raveling and
breaking apart.
City of Cottage Grove, Minnesota Existing Conditions
2017 Pavement Management Project Page 3
Sanitary Sewer
The sanitary sewer system within the project area consists primarily of 8-inch and 9-inch diameter VCP
and PVC, with some 12-inch diameter RCP. The existing sanitary sewer has been televised to evaluate
pipe condition. The televising reports show that the pipe is generally in good condition. However, some
problems encountered in the existing sanitary sewer were root intrusion, cracked pipe and sags.
Miscellaneous structure repairs including patching, lining, and other repairs were noted during the
inspections.
Water Main
The water mains within the project area consist primarily of 6-inch diameter DIP, with 12-inch diameter
th
DIP along 76 Street. The mains were installed in conjunction with the development of the
neighborhoods.
The water mains are believed to be in good condition. However, projects of similar eras have had
a similar condition. Therefore, some select valves will be checked for corrosion prior to street work
occurring. Additionally, there are expected to be some valves which are not operational and will need to
be addressed with the project. The valves will be operated and evaluated by Public Works prior to the
start of the project.
Storm Sewer
The existing storm sewer has been televised to determine pipe condition and necessary repairs. In
addition, storm structures were also inspected. Storm sewer mains are generally in good condition.
However, some problems encountered in the existing storm sewer were cracked or broken pipes and
dirty lines. Three storm stuctures in the Rollings Hills neighborhood and three storm structures in the
Jamaica Ridge neighborhood were noted as being beyond the point of being effectively patched or
repaired. Miscellaneous structure patching, lining, and other repairs were also noted during the
inspections.
PROPOSED IMPROVEMENTS
Streets
Due to the range of pavement ages within the neighborhoods, two primary rehabilitation methods
replacement and mill-overlay. However, due to the observed depth and extent of the pavement
stripping in the cores, extent of previous City maintenance, and past City experience with streets of this
age and condition, a mill-overlay is not recommended at this time. While some streets may be able to
successfully accept a mill-overlay, the severity of cracking in the base course is anticipated to vary
greatly. Therefore, the project area was viewed as a whole for future maintenance and management.
The risks typical of all mill-overlay projects, i.e. reflective cracking and the associated maintenance
required were evaluated to determine acceptable risk levels. Past projects have shown that stripping of
the pavement can extend well below the surface of the pavement, making complete removal of the
stripped portions unfeasible. In those cases, the remaining pavement posed risk for excessive volume of
cracking or raveling in the base course.
City of Cottage Grove, Minnesota Proposed Improvements
2017 Pavement Management Project Page 4
Due to the types of distress present in the existing pavement, the anticipated acceleration of
deterioration due to asphalt stripping, and risks associated with a mill-overlay at this age, the residential
streets within the Rolling Hills neighborhood and the Jamaica Ridge neighborhood are proposed to
undergo a full pavement removal and replacement with 3.5 inches of new pavement. The wear course is
proposed to be virgin mix, excluding the use of recycled asphalt pavement (RAP).
Due to budgetary constraints, the City has decided to delay the pavement replacement in the Prestige
Estates neighborhood. The City will continue to monitor the deterioration until the pavement warrants
full replacement. In addition, a portion of the neighborhood will likely need full curb replacement in the
future.
The concrete curb and gutter in the Rolling Hills 3 rd, 6 th, and 7 th Additions; and the Jamaica Ridge 1 st and
2 nd Additions is proposed to undergo spot replacement. The curb in poor condition will be evaluated for
removal just prior to construction. Preliminary estimates indicate that approximately 36% will need to
be removed and replaced in the Rolling Hills 3 rd, 6 th, and 7 th Additions; and approximately 29% will need
stnd
to be removed and replaced in the Jamaica Ridge 1 and 2 Additions. The t
necessarily evenly distributed and there may be some long sections of curb replacement. Where
conditions are favorable, the goal is that the concrete curb and gutter last two pavement lifecycles.
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The concrete curb and gutter in the Rolling Hills 4 and 5 Additions is proposed to undergo full
replacement due to the large amount of curb damage in that neighborhood. Replacing all of the curb
and gutter will:
1.Result in a more consistent product due to being machine laid versus hand poured
2.Produce a more uniform flow-line and improve drainage characteristics
3.Reduce the chance for differential settlement between panels
The existing D412 concrete curb and gutter will be replaced with a surmountable curb and gutter.
In locations where curb is replaced in front of driveways, curb will be removed and replaced and each
driveway will be patched the entire width with in-kind materials as a part of the street rehabilitation
process. In areas of spot curb replacement, this patch typically extends a few feet behind the curb.
Concrete pads for community mailboxes will only be replaced in the areas with full curb replacement.
Restoration is anticipated to consist of screened Loam Topsoil Borrow with seed and hydromulch.
Traffic signs are proposed to be replaced as a part of this project to meet federal retroreflectivity
requirements. In addition, signs will be evaluated for conformance to the adopted City sign policy and
signs will be removed or supplemented as required.
The existing street light system will be evaluated for repair. In areas where spot curb replacement is
proposed, faulty direct-bury wiring will be replaced where necessary. In areas where full concrete curb
replacement is proposed, the existing direct-bury street light wire is proposed to be replaced within a
PVC conduit. The City has experienced increased maintenance due to deterioration of the existing
direct-bury wire and the full curb removal process will likely impact the wiring. The new wire and
conduit will require the installation of hand holes at every street light pole. Feed point cabinets and
controllers will be evaluated in each neighborhood for replacement as a part of this project.
Walkway
Costs have been included in this report to update all pedestrian ramps to the current Americans with
Disabilities Act (ADA) standards. Some segments existing trail or sidewalk may need to be removed in
City of Cottage Grove, Minnesota Proposed Improvements
2017 Pavement Management Project Page 5
th
order to construct compliant pedestrian ramps. In addition, the existing trail along 76 Street between
Hinton and Homestead will be resurfaced.
Sanitary Sewer
Inline repairs are recommended to address cracks within the pipe. Where there are sags with a history
of back-ups, it is recommended that the pipe be removed and replaced. The sanitary sewer manhole
castings will be salvaged and reinstalled. The existing concrete adjusting rings will be replaced with new
high density polyethylene (HDPE) adjusting rings to conform to current City standards.
Water Main
It is proposed that broken valve top sections be removed and replaced as a part of this project. It is
anticipated that a small sample of valves be dug up in each neighborhood and checked for bolt corrosion
this fall. Any corroded bolts would be replaced if necessary, and additional valves with like conditions
could be dug up and checked if warranted. As a part of this process, the valve box would be replaced in
conjunction with the work. Also, it is proposed to extend the hydrant barrel on any hydrant requiring
adjustment. Finally, hydrants will be reconditioned by sandblasting and painting, and concrete hydrant
access pads are proposed to be constructed in accordance with current City standards.
Storm Sewer
Generally speaking, the intent of this project is to rehabilitate the streets and not change existing
drainage patterns. In-line repairs are recommended to address cracks and leaking or offset joints.
Structures in poor condition will be replaced to conform to current City standards. Adjustment rings for
manholes will be replaced with HDPE rings. Catch basin rings will not be replaced unless the curb
adjacent to them is removed, or failure of the rings has occurred. The existing castings will be salvaged
and reinstalled. Miscellaneous structure patching, lining, and other repairs will be performed as needed.
Public Works staff provided input on areas with historic drainage concerns. No major flooding or
drainage issues were noted; therefore only minor curb grade modifications are proposed to facilitate
drainage.
Storm Water Quality
Storm water quality improvements are not required in this neighborhood due to no increase of
impervious surfacing.
PERMITS AND EASEMENTS
A Phase II General Storm Water Permit from the MPCA would is anticipated to be required for the
project because disturbance and restoration will likely exceed one acre.
All streets in the project area are located within the South Washington Watershed District (SWWD),
however, because there will be no disturbance to the existing subgrade a permit is not required.
A Northern States Power encroachment agreement or permit is anticipated for the improvements in the
Jamaica Ridge neighborhood along Jamaica Avenue.
No additional drainage and utility easements are anticipated in the neighborhoods, however, this will be
evaluated during the final design phase of the project.
City of Cottage Grove, Minnesota Permits and Easements
2017 Pavement Management Project Page 6
ESTIMATED COSTS
Cost estimates for the improvements have been prepared and are included in Appendix C. All costs for
items to be constructed are based on anticipated unit prices for the 2017 construction season. All costs
include a twenty-five (25) 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. The following is an
overall summary of the estimated costs:
Table 2: Estimated Cost Summary
Estimated Cost Summary
Location Estimated Project Cost
Rolling Hills 4 th and 5 th Additions (Full Curb) $609,801.08
Rolling Hills 3 rd, 6 th, and 7 th Additions (Spot Curb) $626,397.32
Jamaica Ridge Additions (Spot Curb) $714,598.52
Total Estimated Project Cost: $1,950,796.92
Future Prestige Estates Additions $675,063.86
Costs presented include 10% contingency + 25% indirect costs
Cost Allocation
Assessments for this project will be based upon the "Infrastructure Maintenance Task Force Special
Assessment Policy for Public Improvements," dated September 30, 2005, Revised August 8, 2012. All
adjacent benefiting properties are proposed to be assessed. Per the Urban Residential policy, 45% of the
project cost for both surface and subsurface improvements would be assigned to each individual
residential lot on a unit basis. The intent of the City's policy is to treat all properties within a residential
development as similar individual units regardless of lot frontage. The amount assessed is based on the
City standard street section even if the width is greater. City funds would be responsible for the
remaining 55% of the project costs.
Per the policy, 100% of the project costs adjacent to the property are assessed to City-owned property.
In areas where residential property was opposite City property, half of the street width was assigned to
the residential area and the other half to the City. The estimated project assessments are as follows:
Residential Land Use:
Infrastructure costs adjacent to City property or other land uses are removed from the neighborhoods in
order to determine the residential cost contribution. The policy also states that all urban/residential lots
on urban/residential streets shall be assessed based on the city standard street section even if the width
is greater.
City of Cottage Grove, Minnesota Estimated Costs
2017 Pavement Management Project Page 7
Table 3: Residential Deductions
Deductions to Residential Property
Location City Property Street Width Estimated Assessment Deduct
Rolling Hills 4 th and 5 th Additions $0.00 $21,180.07 $21,180.07
Rolling Hills 3 rd, 6 th, and 7 th Additions $30,236.65 $0.00 $30,236.65
Jamaica Ridge Additions $5,908.73 $0.00 $5,908.73
Totals: $36,145.38 $21,180.07 $57,325.45
Per the IMTF policy, urban residential lots on urban/residential streets within or outside the MUSA, 45%
of the project costs for both surface and sub-surface assessments will be assessed.
Table 4: Residential Cost Allocation
Estimated Cost Allocation Per Policy
Residential Assessed
Estimated Estimated Residential
Location Amount
Project Cost Assessment Deduct Adjusted Cost
(45% of Total)
Rolling Hills
4 th and 5 th $588,621.01 $264,879.46
$609,801.08 $21,180.07
Additions
Rolling Hills
rdthth
3, 6, and 7 $596,160.68 $268,272.31
$626,397.32 $30,236.65
Additions
Jamaica Ridge
$708,689.80 $318,910.41
$714,598.52 $5,908.73
Additions
Totals: $1,950,796.92 $57,325.45 $1,893,471.49 $852,062.18
Based on the table below, the total single family residential assessment is $4,997.73 per unit in the
ththrdthth
Rolling Hills 4 and 5 Additions, $3,193.72 per unit in the Rolling Hills 3, 6, and 7 Additions, and
$3,504.51 per unit in the Jamaica Ridge Additions.
City of Cottage Grove, Minnesota Estimated Costs
2017 Pavement Management Project Page 8
Table 5: Estimated Cost Per Residential Unit
Estimated Cost Per Unit
Assessable Assessed Amount Assessed Cost Per
Location
RBLE Units (45% of Total) RBLE Unit Per Policy
Rolling Hills 4 th and 5 th Additions (Full Curb) 53 $264,879.46 $4,997.73
Rolling Hills 3 rd, 6 th, and 7 th Additions (Spot Curb) 84 $268,272.31 $3,193.72
Jamaica Ridge Additions (Spot Curb) 91 $318,910.41 $3,504.51
Totals: 307 $852,062.18
When the calculated assessment exceeds the special benefit appraisal, the single-family assessments
will be proposed to be capped at the amount of the special benefit appraisal. If needed, City funds will
cover the difference between the calculated assessment and the benefit appraisal. The 2015 benefit
appraisal was $5,100 for full curb replacement and $5,000 for spot curb replacement. Since past benefit
appraisals have supported the improvements in similar urban residential neighborhoods, benefit
appraisals were not conducted in these neighborhoods.
Summary:
The IMTF policy therefore allocates costs in the following manner:
Table 6: IMTF Cost Summary
Estimated Cost Allocation Per Policy
Residential Assessed
Estimated Project
Location Amount Other Funds*
Cost**
(45% of Total)
Rolling Hills 4 th and 5 th
$264,879.46 $344,921.62 $609,801.08
Additions
Rolling Hills 3 rd, 6 th,
$268,272.31 $358,125.02 $626,397.33
and 7 th Additions
Jamaica Ridge
$318,910.41 $395,688.11 $714,598.52
Additions
Totals: $852,062.18 $1,098,734.75 $1,950,796.93
*See Appendix C for Fund Breakout
** Total Project Cost (10% contingency + 25% Indirect)
City of Cottage Grove, Minnesota Estimated Costs
2017 Pavement Management Project Page 9
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
Utility and Enterprise funds for items such as storm sewer and street lighting improvements. Figures 11
and 12 depict the assessable parcels for the project.
PUBLIC HEARING
Because the properties within the project area 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 further action to
be taken.
PROJECT SCHEDULE
Below is the proposed schedule assuming starting construction in 2017:
06/01/2016 Council Orders Feasibility Report
08/03/2016 Council Workshop
08/04/2016 Hold Neighborhood Meeting
08/10/2016 Council Receives and Approves Feasibility Report
Council Sets a Public Improvement Hearing Date
09/07/2016 Council Holds Public Improvement Hearing
Council Orders the Preparation of the Plans and Specifications
01/04/2017 Council Approves the Plans and Specifications
02/09/2017 Project Bid Date
02/15/2017 Contract Award
Spring 2017 Begin Construction
September 2017 Complete Construction
September 2017 Council Sets Assessment Hearing Date
October 2017 Council Holds Assessment Hearing
CONCLUSION AND RECOMMENDATIONS
It is recommended that this report be used as a guide for the layout, design, and cost allocation for the
public improvements to be made as part of the 2017 Pavement Management Project. 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, Minnesota Public Hearing
2017 Pavement Management Project Page 10
To determine project feasibility, a comparison was made between the costs estimated herein and the
costs experienced for other similar projects within the City. These comparisons, on a per linear foot
construction cost basis (no indirect project costs), are shown in the following table:
Table 7: Cost Per Unit Comparison
Cost Per Unit Comparison
2017 Pavement Management Project (Estimated)
Rolling Hills 4 th and 5 th Additions Pavement Replacement Area & Full Curb $152.88
Rolling Hills 3 rd, 6 th, and 7 th Additions Pavement Replacement Area & Spot Curb $113.35
Jamaica Ridge Additions Pavement Replacement Area & Spot Curb $107.38
2016 Pavement Management Project (Bid Results)
District D2 Pavement Replacement Area & Full Curb $142.93
District F3/F5 Pavement Replacement Area & Spot Curb $97.06
80 th Street $226.11
2015 Pavement Management Project (Bid Results)
District F2/F3/F4 Pavement Replacement & Spot Curb $84.10
90 th Street $208.59
2014 Pavement Management Project (Bid Results) $92.63
2013 Pavement Management Project (Bid Results)
District C1 & District C2 Pavement Replacement Area & Full Curb $151.18
District C2 Mill & Overlay Area $94.09
From the tabulation above, it can be seen that the cost to rehabilitate in the residential areas are similar
to past projects of like scope. The increase depicted is partially due to the anticipated rise in
construction and material costs and the additional curb and gutter replacement that will be necessary
with this project.
Financial responsibilities have been determined based on estimated project costs as well as adopted City
policy. Funding sources consist of assessments to benefitted properties and use of existing designated
City funds.
Based on the information contained herein, it can be concluded that the construction of utility and
street improvements is feasible. The deteriorated condition of the pavement, stable condition of the
subgrade, and condition of the concrete curb and gutter suggest that various methods of rehabilitation
be performed. The improvements are cost effective as they utilize the existing subgrade and keep
existing curb wherever possible.
City of Cottage Grove, Minnesota Conclusion and Recommendations
2017 Pavement Management Project Page 11
From an engineering standpoint, this project is feasible, necessary, cost effective, and can best be
accomplished by letting competitive bids for the work under one contract in order to complete the work
in an orderly and efficient manner.
City of Cottage Grove, Minnesota Conclusion and Recommendations
2017 Pavement Management Project Page 12
Appendix A: Existing Pavement Condition
Photos
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 13
Rolling Hills
th
Approximate Location: 7819 76 Street South
Recent patching adjacent to and over previous patching and pavement fatigue
Rolling Hills
th
Approximate Location: 7988 77 Street
Curb and gutter settlement
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 14
Rolling Hills
Approximate Location: 7939 Hyde Avenue
Previous bituminous patching of asphalt stripping
Rolling Hills
Approximate Location: 7590 Homestead Avenue
Alligator cracking and curb and gutter settlement
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 15
Rolling Hills
Approximate Location: 7940 Hyde Avenue
Extensive patching and failure around manholes
Rolling Hills
Approximate Location: 7656 Hyde Avenue
Patching and failure adjacent to curb and gutter
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 16
Prestige Estates
th
Approximate Location: 9491 79 Street
Temporary skin patch overlay across entire width of road
Prestige Estates
Approximate Location: 7970 Jenner Avenue
Asphalt stripping and previous patching
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 17
Prestige Estates
Approximate Location: 7930 Jenner Avenue
Reflective cracking through temporary skin patch overlay
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 18
Prestige Estates
Approximate Location: 7752 Jenner Avenue
Asphalt stripping
Prestige Estates
Approximate Location: 7826 Jocelyn Avenue
Asphalt stripping and previous route & seal of joints
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 19
Jamaica Ridge
Approximate Location: 8194 Janero Avenue
Asphalt stripping and previous patching
Jamaica Ridge
Approximate Location: 8381 Jasmine Avenue
Failure around manholes
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 20
Jamaica Ridge
Approximate Location: 8463 Jasmine Avenue
Recent patching adjacent to and over previous patching
Jamaica Ridge
Approximate Location: 8169 Jasmine Avenue
Small block cracking and pavement fatigue
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 21
Jamaica Ridge
Approximate Location: 8115 Jasmine Avenue
Small block cracking and pavement fatigue
Jamaica Ridge
Approximate Location: 9030 Upper 81 st Street
Previous route & seal of joints
City of Cottage Grove, Minnesota Appendix A: Existing Pavement Condition Photos
2017 Pavement Management Project Page 22
Appendix B: Figures
City of Cottage Grove, Minnesota Appendix B: Figures
2017 Pavement Management Project Page 23
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Appendix C: Cost Estimate Summary
City of Cottage Grove, Minnesota Appendix C: Cost Estimate Summary
2017 Pavement Management Project Page 36
Appendix D: Preliminary Assessment Roll
City of Cottage Grove, Minnesota Appendix D: Preliminary Assessment Roll
2017 Pavement Management Project Page 38
Appendix E: Pavement Cores
City of Cottage Grove, Minnesota Appendix E: Pavement Cores
2017 Pavement Management Project Page 44
GEOTECHNICAL EXPLORATION AND FACTUAL ENGINEERING REPORT
/ƚƷƷğŭĻ DƩƚǝĻ ЋЉЊА ta tğǝĻƒĻƓƷ /ƚƩĻƭ
/ƚƷƷğŭĻ DƩƚǝĻ
aźƓƓĻƭƚƷğ
bL tƩƚƆĻĭƷ ЊЏ͵ЏЊЎАВ͵ЋЉЉ
tƩĻƦğƩĻķ CƚƩʹ
Bolten And Menk, Inc.
Attn.: Michael Boex, P.E.
2035 County Road D East
Suite B
Maplewood, MN 55109
July 14, 2016
Bolten and Menk, Inc.
2035 County Road D East
Suite B
Maplewood, MN 55109
Attn: Mr. Mike Boex, P.E.
Subject: Geotechnical Exploration and Factual Engineering Report
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Dear Mr. Boex,
In accordance with your request and subsequent authorization, Northern Technologies, LLC. (NTI)
conducted a Geotechnical Exploration for the above referenced project. Our services included coring
the pavement at eleven (11) locations in District B1, District C3, and District F3 within the City of
Cottage Grove, as well as preparation of a factual engineering report. Our work was performed in
general accordance with our proposal dated June 13th, 2016.
Pavement core samples obtained at the site will be held for 60 days at which time they will be
discarded. Please advise us in writing if you wish to have us retain them for a longer period. You will
be assessed an additional fee if samples are retained beyond 60 days.
We appreciate the opportunity to have been of service on this project. If there are any questions
regarding the soils explored or our review and recommendations, please contact us at your
convenience at (763) 433-9175.
Northern Technologies, LLC.
Kyler Bender, P.E. Richard Jett, E.I.T.
Construction Services Manager / Graduate Engineer
Principal Engineer
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
#®³¤³²
1.0 INTRODUCTION ................................................................................................................. 1
Њ͵ЊtƩƚƆĻĭƷ 5ĻƭĭƩźƦƷźƚƓ ͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵ Њ
Њ͵Ћ{ĭƚƦĻ ƚŅ {ĻƩǝźĭĻƭ ͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵ Њ
2.0 EXPLORATION PROGRAM RESULTS .................................................................................... 1
Ћ͵Њ9ǣƦƌƚƩğƷźƚƓ {ĭƚƦĻ ͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵ Њ
Ћ͵Ћ{ǒĬƭǒƩŅğĭĻ /ƚƓķźƷźƚƓƭ ͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵͵ Ћ
3.0 CLOSURE ........................................................................................................................... 2
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
1.0 INTRODUCTION
1.1 Project Description
It is our understanding that the project includes the reconstruction of the residential streets located
in District B1, District C3, and District F3 (as outlined in the provided location plan) in Cottage Grove,
Minnesota.
1.2 Scope of Services
each approximate location within each district. The cores were advanced
through both the asphalt and aggregate base layers and the approximate thicknesses of each layer
were measured. Locations were marked by Bolten and Menk, Inc. personnel. The purpose of this
report is to present a summary of our geotechnical exploration and provide pavement information
based upon pavement cores obtained at the client-designated locations.
2.0 EXPLORATION PROGRAM RESULTS
2.1 Exploration Scope
Pavement coring occurred on July 8th, 2016 at the approximate locations as presented on the Coring
Location Diagram within Appendix A. A photograph of each core can be found in Appendix B.
Page 1 of 3
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
2.2 Subsurface Conditions
Table 1 provides the measured average thickness of the pavement cores obtained at the project area.
Table 1: Pavement Core Thickness at Project Area
Location Number Thickness of Pavement (in)* Depth of Base (in)
1 4 10.5
2 4 9
3 3 8
1
4 5 N/A
5 4.5 7.5
6 4 8.5
7 4 7
8 3 8
9 4 7.5
10 3.5 7
11 3.25 8
* Pavement thicknesses listed within Table 1 may differ from those within Appendix B. Some
cores dissolved during the coring process.
1.
Base not consistent with other locations. Soil encountered was granular with no crushed
limestone present.
3.0 CLOSURE
The scope of services for this project does not include either specifically or by implication any
environmental or biological assessment of the site or identification or prevention of pollutants,
hazardous materials or conditions. If the owner is concerned about the potential for such
contamination or pollution, other studies should be undertaken.
Page 2 of 3
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Northern Technologies, LLC. has endeavored to comply with generally accepted geotechnical
engineering practice common to the local area. Northern Technologies, LLC. makes no other
warranty, expressed or implied.
Northern Technologies, LLC.
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
Richard Jett, E.I.T.
Minnesota.
Graduate Engineer
Kyler Bender
Date: 07/13/2016 Reg. No. 50971
Kyler Bender, P.E.
Construction Services Manager /
Principal Engineer
Page 3 of 3
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
APPENDIX A
BORING LOCATION DIAGRAM
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
APPENDIX B
CORE PHOTOGRAPHS
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200
Cottage Grove 2017 PM Pavement Cores
Cottage Grove, Minnesota
NTI Project No. 16.61579.200