1f. Sanitary Sewer LS 24 Rehab: Approve Quote
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
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
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MEMORANDUM
TO:
Todd Gerhardt, City Manager
/J (') ,
Paul Oehme, Director of Public Works/City Engineer ,( I
FROM:
DATE:
March 22, 2010
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SUBJ:
Sanitary Sewer Lift Station #24 Rehabilitation: Approve Quote
PROPOSED MOTION
"The City Council approves a quote in the amount of $81,118.13 to Quality Flow
Systems, Inc. for pumps and VFD's at Lift Station #24."
City Council approval requires a simple majority vote of the City Council
present.
BACKGROUND
Annually, the City considers replacement of equipment for lift stations that are
worn, umeliable, and impractical to maintain. These replacements are a pro-
active approach designed to make Chanhassen's core sewer collection system
more reliable and less likely to cause costly emergency repairs and potential
sewer backups. The Utility Department currently maintains 31 lift stations in the
wastewater collections system. Lift Station #24 has been identified as the next lift
station needing rehabilitation.
DISCUSSION
Lift Station #24, located at the intersection of Lyman Boulevard and Audubon
Road, is the largest, highest volume station of all the 31 lift stations the City
maintains. It serves over 1,300 homes and Chanhassen's new high school. Lift
Station #24 was constructed in 1991 and has since undergone some needed pumps
and piping replacement. Two (2) of the four (4) pumps were replaced in 2009 due
to wear/failure and a protective coating was applied to the stations wet wells to
prevent harmful sewer gas from damaging the interior concrete walls.
In 2010, staff proposes the final upgrades to the station as previously identified in
the 2010 lift station CIP project. This involves replacing the last two (2)
wastewater pumps, installing variable frequency drives to improve electrical
efficiency, and updating the aging control system. When the station was built, it
was equipped with (3) large 88 H.P. pumps without soft starters or variable
drives. Completing this project will update the station with smaller premium
efficiency 65 H.P. pumps and variable drives that will reduce operation costs.
Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow
Todd Gerhardt
LS #24 Rehabilitation: Approve Quote
March 22,2010
Page 2
Variable frequency drives (VFD's) offer the ability to employ "flow proportioning" or matching
pumping output to the station's inflow, thereby reducing costly motor starts. VFD's also limit
costly amperage spiking when a motor starts by starting motors with a controlled "ramp-up".
Ramping up the motor instead of a sudden spike of power should reduce ware on the pump
motors.
Staff has received three quotes for the pumps and VFD's. All quotes include installation
delivery and tax. The quotes for this work are as follows:
$83,155.16
$30,249.90
$113,405.06
$68,667.19
N/A
$50,231.25
30,886.88
$81,118.13
2 ea. - Pumps
4 ea. - VFD's
Total
$68,667.19
Quality Flow Systems, Inc. had the low quote for both the pumps and VFD's. Quality Flow
Systems, Inc. has worked with the City on previous lift station rehabilitation and well projects.
Their work has been acceptable.
Staff is still waiting on separate quotes for controls for the lift station. Consideration for
replacement of the control quotes will be placed on a future agenda.
Attachment: CIP Page SS-017
c: Kevin Crooks, Utility Superintendent
g:\eng\public\pw055- lift stations (general)\bkg 0322\ 0 Is 24 rehab. doc
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Capital Improvement Program
City of Chanhassen,. MN
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2010 thru 2014
Project #
SS'-017
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Project Name Sanitary Lift Station Rehabilitation Program
Account #1 701-7025-4751
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Account #2
Account #3
Accouut #4
Department Sanitary SewerImprovements
Contact Paul Oehme
Type Improvement
Useful Life Unassigned
Category Utilities
Priority nta
Description I Total Project Cost: $545,000
The sanitary lift station rehabilitation program is designed to minimize sewer backups and emergency calls due to failed lift station equipment. The
City currently maintains 31 lift stations. Many of these lift stations are high service pumps and need frequent servicjng. The program will service
or replace pumps, pipe gallery, and electrical components as needed. The proposed lift stations scheduled for improvements over the next 5 years
are as follows:
2010 - #24
2011-#10and#1l
2012 - #16 and #21
2013 - #1, #22 and #25
2014 - #23
Justification
Reduce emergency calls and potential sewer backups.
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Prior
75,000 I
Total
Expenditures
Maintenance
Total
Prior
75,000 I
Total
Funding Sources
Sewer Utility Fund
Total
Budget Impact/Other
2010
225,000
225,000
2010
225,000
225,000
2011
90,000
90,000
2011
90,000
90,000
2012
50,000
50,000
2012
50,000
50,000
91
2013
65,000
65,000
2013
65,000
65,000
2014
40,000
40,000
2014
40,000
40,000
Total
470,000
470,000
Total
470,000
470,000