Memorandum

City of Lawrence

Public Works

TO:	David P. Cronin, P.E., City Engineer
CC:	Charles Soules, P.E., Director of Public Works
FROM:	Matt Bond, P.E., Stormwater Engineer
DATE:	January 28, 2015
RE:	Maple Street Pump Station, 6^th & Maple Street Project No. PW1133, City Bid No. B1503

Background

The North Lawrence Drainage Study (NLDS) was received by the Lawrence City Commission in January 2006.  Upgrading the pump station on Maple Street in North Lawrence was one of the recommendations of the NLDS.  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.  The design team of Bartlett & West Engineers & CDM Smith was chosen for engineering services. 

Several public meetings have been conducted during the course of the design work.  These meetings consisted of a general public information meeting at the North Lawrence Depot, a presentation to the North Lawrence Neighborhood Association, as well as a meeting with individual property owners. The engineering drawings for the project have been reviewed and approved by the U.S. Army Corps of Engineers. 

Project Description

The existing pump station is a converted sanitary sewer lift station with a maximum pumping capacity of approximately 38 cfs (cubic feet per second) and is undersized for the amount of stormwater it conveys during rain events.  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). Once stormwater has been collected at the pump station location it will then be pumped underneath the railroad tracks and into a junction box on the northwest corner of the intersection of Locust & 6th Streets.  From there it will drain by gravity in a new 66" diameter reinforced concrete pipe to the Kansas River. 

All of the temporary construction easements have been acquired for this project.  In addition all of the private utilities have been relocated out of the new proposed storm sewer alignment.

Project Schedule

Advertise for bids: February 4, 2015

Bid date: February 24, 2015

Anticipated Start Date: Late March to early April 2015

Project Completion Date: December 18, 2015

Project Funding

This project is being funded with the previously mentioned Infrastructure Sales Tax Revenue. The NLDS estimated the construction cost for this project at $4.279 million. 

Action

Set a bid date of February 24, 2015 for the construction of the Maple Street stormwater pump station - Project No. PW1133.