1b. Lift Station 10: Approve Consultant Contract09
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
Finance
Phone: 952.227.1140
Fax: 952.227.1110
Park & Recreation
Phone: 952.227.1120
Fax: 952.227.1110
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
7901 Park Place
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
MEMORANDUM
TO: Todd Gerhardt, City Manager
Uf
FROM: Paul Oehme, Director of Public Works /City Engineer .
DATE: June 10, 2013 v '
SUBJ: Lift Station 10 Improvements, Project No. 13 -07: Approve
Consultant Contract
PROPOSED MOTION
"The City Council approves a consultant contract with WSB & Associates for
design and construction administration services for Lift Station 10
Improvements in the amount of $46,667."
City Council approval requires a simple majority vote of those present.
BACKGROUND
Lift Station No. 10 is located at
the end of Big Woods Drive
next to Lotus Lake and services
a large area of the City's Lotus
Lake Sanitary Sewer District.
This sewer district is nearly
fully developed however the
sanitary lift station storage
capacity is undersized for the
size of the district. The lift
station was originally
constructed in 1975. The Lift
Station No. 10 service area
extends from Pleasant View
Road to south of Sierra Trail
between Lucy Lake and Lotus
Lake. Two additional lift
stations (Nos. 9 & 11) pump to
the collection system, which
conveys flow to Lift Station
No. 10. The service area
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Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow
Mr. Todd Gerhardt
June 10, 2013
Page 2
encompasses approximately 480 acres and includes approximately 989 service
connections. The sanitary sewer flow to the lift station is 0.271 million gallons
per day (MGD). An 8 -inch forcemain extends from the lift station southeast
along Lotus Lake to Hwy 101 where it discharges into a 21 -inch trunk sewer. The
forcemain is approximately 7,625 feet in length. The station was last worked on
in 2002 when new controls and a standby generator were installed. The lift
station is the second largest pumping station the City maintains.
DISCUSSION
LS 10 wet well capacity is inadequate to effectively handle the volume of
wastewater going through the station. The existing wet well has only about 8ft. of
normal storage. The recommended storage for the volume of flow going to this
station is calculated at 21 ft. Since the station has significantly undersized wet
well capacity, the pumps cycle continuously causing premature wear. These
pumps are constantly being serviced. The significant amount of pump cycling per
day is also electrically inefficient. Additionally, when problems occur,
emergency responders have very little time to diagnose, correct the problem and
get the station running again before it overflows because the station essentially
does not have any emergency storage.
Staff is proposing to drill a new wet well on the existing lift station easement to
create the recommended normal and emergency storage. The station is in close
proximity to residential lakeshore properties so construction is limited to the
existing lift station easement. The new wet well is anticipated to be drilled next to
the existing lift station using caisson construction technique. The existing lift
station will be kept in service while the new wet well is being constructed. A tri-
plex submersible pump station is proposed to provide additional storage working
range for the pumps and for a more efficient pumping operation. This will reduce
the number of hourly starts and reduce the excessive wear on the pumps. The tri-
plex station pumps would also be smaller, in the range of 36 hp to 50 hp.
Fencing and landscaping improvements will be part of the project. Staff intends
to meet with the adjacent property owners to work with them on a mutually
acceptable plan.
Consultant Proposals
Staff emailed request for proposals (RFP) to three consultants for final design and
construction services. On May 16, 2013, staff received proposals for the work
from the consultants. All firms submitted a proposal which is summarized as
follows:
Mr. Todd Gerhardt
June 10, 2013
Page 3
Barr
Foth WSB &
Engineering
Infrastructure Assoc., Inc.
& Environment
Submitted prior to the ✓
✓ ✓
�-
deadline
Proposal format ✓ F ✓ ✓
Transmittal letter submitted ✓ ✓ ✓
Consultant team identified ✓ �✓ ✓
Understanding of project
✓ ✓
✓
Estimate of hours and fees
✓ ✓
✓
for each task
Total Fee
$53,000
$57,628
$46,667
All firms met the minimum qualifications for the project. WSB & Associates had
the lowest proposal. WSB has worked on other lift station projects for the City.
The most recent project was improvements to lift station 3 on TH 7. They were
also the engineer that assisted the City with the design of the 2012 street
reconstruction project in the Minnewashta Height neighborhood. Their work has
been acceptable.
The contract would be a time and materials based work not -to- exceed amount. As
with all engineering contracts, the consultant must submit periodic invoices for
staff review prior to processing. The consultant will be required to submit
timesheets verifying the hours worked on the project and expense sheets. Staff
will review the invoices and expense sheets for accuracy and conformance to the
contract.
Schedule
The tentative schedule for the project is as follows:
Neighborhood Meeting July 2013
Award of Construction Contract September 23, 2013
Construction Start October 7, 2013
Substantial Completion December 13, 2013
Final Completion June 13, 2014
Attachments: CIP sheet
0
Capital Improvement Program 2013 rhru 2017
City of Chanhassen, MN
Project # SS-023
Project Name Lift Station 10 Improvements
Account #1 701-7025 -
Account #2
Account #3
Account #4
Department Sanitary Sewer Improvements
Contact PaulOehme
Type Improvement
Useful We
Category Utilities
Priority . n/a
Description Total Project Cost: $360,000
[his project would increase the wet well capacity, replace the pumps with more efficient pumping sequencing and replace the outdated electrical
)anel of the lift station.
Justification
Lift Station 10 has a large sewer shed which is located on the west side of Lotus Lake in the Carver Beach area. The station is one of the largest
he City maintains. Currently Lift Station 10 has a significantly undersized wet well capacity. The pumps cycle continuously which causes
)remature wear on the pumps and motors and is very inefficient. Also, the small wet well does not allow much time for the utility department to
•espond if station problems occur. The lift station is located next to Lotus Lake, which could lead to environmental problems if an accident were
0 occur.
Expenditures 2013 2014 2015 2016 2017 Total
Construction 360,000 360,000
Total 360,000 360,000
Funding Sources 2013 2014 2015 2016 2017 Total
Sewer utility Fund 360,000 360,000
Total 360,000 360,000
91