1c. Hill Street Drainage Imp: Approve Plans and Auth Ad
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone 952.227.1100
Fax 952.227.1110
Building Inspections
Phone: 952.227.1180
Fax 952.227.1190
Engineering
Phone 952.227.1160
Fax 952.227.1170
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Phone: 952.227.1140
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Phone 952.227.1120
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Recreation Center
2310 Coulter Boulevard
Phone 952.227.1400
Fax 952.227.1404
Planning &
Natural Resources
Phone 952.227.1130
Fax: 952.227.1110
Public Works
1591 Park Road
Phone: 952.227.1300
Fax 952.227.1310
Senior Center
Phone: 952.227.1125
Fax 952.227.1110
Web Site
www.ci.chanhassen.mn.us
i~
MEMORANDUM 0-
TO: Paul Oehme, Director of Public Works/City Engineer ~
FROM: Terrance JefTery, Water Resources Coordinator ~l
DATE: November 9, 2009 ~
SUBJECT: Hill Street Drainage Improvement Project No. SWMP19-2008-01
Approve Plans & Specifications; Authorize Advertisement for Bids
PROPOSED MOTION
"The City Council approves the plans and specifications and authorizes
advertisement for bids in the Construction Bulletin and Chanhassen Villager
for the Hill Street Drainage Improvement Project No. SWMPI9-2008-01."
City Council approval requires a simple majority vote of the City Council
present.
BACKGROUND
In 2003, this channel, having
experienced significant erosion and
sediment deposition was cleaned,
reshaped and stabilized with erosion
control blanket by City staff (see photo-
right). This erosion problem has been a
concern of the City and property
owners for many years.
A letter dated September 26, 2005 was
sent to the City by the new property
owners Christopher and Tracey Rust.
This letter itemized their concerns
about the runoff through the swale and the continued erosion problem.
On March 2, 2008, a meeting was held with seven area residents and members of the
Riley-Purgatory-Bluff Creek Watershed District, including members of the Citizen
Advisory Committee for RPBCWD, MnDot and Eden Prairie. The residents of Lotus
Lake voiced their concerns over the water quality of the lake and the safety of the
channel.
On March 12, 2008, the City sent a letter to the RPCWD requesting that the District
provide 1/3 the estimated cost of the project or what was thought to be at that time
Chanhassen is a Community for life - Providing for Today and Planning for Tomorrow
Paul Oehme
Hill Street Drainage Improvement Project
November 9, 2009
Page 2
$33,000. The District provided data from their XP-SWIM Model which was referenced in the
design of the project but chose not to participate in a cost share for this project. Both Eden Prairie
and MnDot have decided not to participate in the cost of the improvement even though runoff from
their respective properties/right-of-way discharges through the swale.
City Staff met with the adjacent property owners several times during the summer of 2008. The
residents continued to express their concern over the safety of the channel and the effect of this
channel on the Lotus Lake water quality. They also emphasized the importance that the
improvements are not pushed off any longer and the solution should be more permanent.
On January I, 2009, City staffreceived quotes from Wenck Associates, Inc. and WSB & Associates
for engineering and design work to stabilize this area. WSB was awarded the contract in the amount
of$9,600 and has prepared the current plan set.
DISCUSSION
Staff is requesting the Council approve the plans and specifications and authorize advertisement for
bids from qualified contractors. This area continues to be an on-going problem with side cutting and
down cutting of the channel still occurring today.
The proposed base bid plan calls for the
eroded area between the retaining wall
along TH 101 and the swale to be filled in
and the water routed through a series of
sump manholes and storms ewer pipe.
This will not only allow for the
stabilization of this land but will dissipate i'
the energy flowing through the system
prior to discharging into the swale.
The swale will then be graded to widen
the channel and minimize the slope. This
will allow for a more laminar flow
through the channel thereby further ... ~~. ", ..
,. r.
reducing the scour force of the water '~. ~\
within the channel. The swale will be reinforced with a turf reinforcement mat at critical areas and
erosion control blanket throughout to seeding with a wetland mix suitable to the area. The base bid
engineer's cost estimate is $74,200.
Bid Alternative 1
Under the base bid plan, there will be minimal pretreatment of the storm water prior to discharging
into Lotus Lake. Because of the grades and the desire to not encroach more than necessary onto
private land, the construction of a pond is not feasible. Another alternative would be to install a
hydrodynamic separator (environmental manhole) at the beginning of this system. This system
would dramatically improve the sediment removal efficiencies of the system and would likely be
applied towards the Total Maximum Daily Load requirements for Lotus Lake when the TMDL is
Paul Oehme
Hill Street Drainage Improvement Project
November 9, 2009
Page 3
completed. However, only up to a 1" rain event would be treated in the environmental manhole
because of the large watershed that flows though the system. The estimate for the environmental
manhole bid alternative is $65,000.
FUNDING
The project is planned to be funded with the Surface Water Management Plan (SWMP) funds and
was identified in the 2009 CIP SWMP-40. Staff had budgeted $55,000 from SWAMP funds for the
project. The remaining funds for the project would corne out of the Fees for Services budget in the
Surface Water Management Fund. Staff will continue to solicit partnerships for this project.
Recently BWSR has submitted guidelines for the Constitutional Amendment funds. It appears that
this project may be eligible for funding through this program. Staff intends on applying for this
grant. It is staff s belief that the bid alternative may not be recommended for award unless an
alternative funding source is secured.
SCHEDULE
If Council authorizes advertisement for bids, the work schedule for Phase 1 will be as follows:
December 16, 2009
Februarv 8, 2010
February 22,2010
April 2, 2010
May 14,2010
Bid Opening
Award Contract at City Council Meeting
Begin Construction
Substantial Completion
Final Stabilization and Restoration Complete
Attachments: Location Map
CIP Page (2009)
Plan Sheet
g:\eng\swmp projects\swmp 19-2008-0 I lotus lake drainage at th 101 outfall\bkgd 110909 approve plans auth ad. doc
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1 Inch = 825 feet
Capital Improvement Program
City of Chanhassen, MN
Project #
SWMP-040
Project Name TH 101 Inlet Project
Account # 1
Account #2
Account # 3
2009 thru 2013
Description I
This project involves stabilizing a channel which directs flow from 1H 101 into Lotus Lake.
Justification
I
Contact Paul Oehme
I
Department Surface Water Management
-
Type Improvement
Useful Life
Category SWMP
Priority nla
Total Project Cost $70,000
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The adjoining property owners are concerned about the erosion on their properties as a result of stormwater discharge through the site. This area is I"
resulting in sediment deposition into Lotus Lake and a 6 foot plunge pool has formed within the Lake at the terminus of the channel.
Expenditures
Construction
Total
Funding Sources
Other Agency Contribution
Surface Water Utility Fund
Total
2009
70,000
70,000
2010
2011
2011
Operational Impact/Other I
Some turf management may be required the second year after completion of the stabilization.
2009
15,000
55,000
70,000
2010
126
2012
2012
2013
2013
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Total
70,000
70,000
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Total
15,000
55,000.
70,000
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WSB
I HEREBY CERTlFY THo\T THIS ~. SPECIFICATION, OR REPORT
WM> PREPARm BY ME OR UNDER MY DIRECT SUPEIMSION SCALE:
AND THo\T I AM A DUl..Y UCENSED PROFESSIONAl.. ENGINEER
UNDER THE LAWS Of' THE STAlE Of MINNESOTA
ROIISION NO.
M,.
EXPINIAlIOH
IS NOTED
701 Xenia Avenue South, SuIte 300
Minneapolis. MN 55416
www.wsbeng.com
HILL STREET
DRAINAGE IMPROVEMENTS
PINllM IDESIGIllM
BAF J,<J(
CHECKED BY: I PROJECT NO:
TEH I 1694-13
RECORD COPr B'r: 00\1E
&: Associates, Inc.
TOOD E. HUB~ER
Oo\1E:November 9. 2009 uc. NO: 24043
763-641-48OQ.F8I783-Mt.1700
INFRASlRUCTURE II ENGINEERING i PLANNING II CONSTRUCTION
CITY OF CHANHASSEN