Memorandum

City of Lawrence

Department of Public Works

TO:	Chuck Soules
FROM:	Matt Bond
CC:	David L. Corliss, Diane Stoddard, Cynthia Wagner, Shoeb Uddin
Date:	January 12, 2012
RE:	January 17, 2012 Agenda Item Maple Street Pump Station, 5^th & Maple, Project No. PW1133 Engineering Services for Stormwater Improvements

Please include the following item on the City Commission agenda for consideration at the January 17, 2012 meeting:

Project Background.  The North Lawrence Drainage Study (NLDS) was received by the Lawrence City Commission in January 2006.  One of the recommendations of the NLDS was the upgrade of the pump station on Maple Street in North Lawrence.  It also detailed the upgrading of the storm sewer infrastructure both up and downstream of the pump station.  In November 2008 the community overwhelmingly supported a 0.3% sales tax for infrastructure improvements.  The City began collecting sales tax funds in April 2009.  The Maple Street Pump Station was specifically designated to use this revenue source.  In preparation for the construction of the pump station, the parcels adjacent to the existing pump station were purchased in July 2010.

Project Description.  The existing pump station is a converted sanitary sewer lift station with a maximum capacity of approximately 38 cfs (cubic feet per second) and is grossly undersized for the amount of stormwater it handles.  The NLDS recommends a pump station with a capacity of 305 cfs.  The area designated as "System 6", in the NLDS, contains roughly 192 acres and experiences localized flooding during significant rainfall events (see Attachment A).  The parcels to construct both the pump station and the wet well have already been acquired (see Attachment B). The corresponding piping leading south from the pump station will include involvement from the US Army Corps of Engineers since it will pass through the Kansas River Levee.  The construction of this project will involve the temporary disruption of traffic in areas adjacent to storm sewer pipe installation. 

Project Funding.  The NLDS estimated the construction cost for this project at $4.279 million.  Due to the complexity of the hydrologic and hydraulic computer models necessary to accurately model the watershed, design is estimated to take nine months to a year to complete.  This would result in the completion of design plans between the end of 2012 and spring 2013.   The bid date would be set within a few months of the completion of the construction plans. This project is being funded with the Sales Tax Revenue. 

Action Request.  If appropriate, authorize staff to receive qualification statements for engineering services for the design of the Maple Street Pump Station and corresponding stormwater sewer improvements.