Memorandum
City of Lawrence
Utilities Department
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TO: |
David L. Corliss – City Manager Cynthia Wagner - Assistant City Manager Diane Stoddard - Assistant City Manager |
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FROM: CC: |
Mike Lawless – Asst. Director of Utilities Dave Wagner – Director of Utilities |
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Philip Ciesielski – Asst. Director of Utilities Mark Hegeman - Utilities Operations Superintendent Bob Brower - Utilities Field Operations Manager Alan Landis - Purchasing Specialist |
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Date: |
November 3, 2010 |
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RE: |
November 9, 2010 Agenda Item – Award contract for the 2010 Cured in Place Pipe Rehabilitation Project |
Please include the following item on the City Commission Agenda for consideration at the November 9, 2010 meeting:
Consistent with the City Commission’s direction during the 2011 Budget Sessions, Department of Utilities Staff continue to monitor and control expenses in relation to actual revenues. As these are evaluated, sources of Capital Project Funding are being identified to carry out the City Commission’s stated goal of executing priority Capital Projects even in the current economic climate. The reasons for executing this project are outlined in the memo below.
History:
Part of the Utilities Department’s efforts at Inflow/Infiltration (I/I) reduction is to repair/reconstruct existing sewer lines that are a source of I/I. Cured-in-place-pipe (CIPP) is one of the methods used. The CIPP method involves lining the inside of vitrified clay pipe sanitary sewer mains without excavation, thus there is very little disruption above ground.
The Utilities Department has a multi-year plan to rehabilitate city owned vitrified clay sewer mains in the City using this trenchless method. Line segments are selected for rehabilitation on the basis of several factors. These factors include:
· Pipe age
· Pipe material
· Known defects based on maintenance and TV inspection records
· Presence of unused taps or connections that may contribute inflow/infiltration
· Depth
· Above ground conditions
Project Summary
The proposed rehabilitation projects consists of, but is not limited to, the lining of approximately 26,140 linear feet of 8-inch VCP sanitary sewer pipe, 958 linear feet of 10-inch VCP sanitary sewer pipe, 410 linear feet of 12-inch VCP sanitary sewer pipe, 1,282 linear feet of 15-inch VCP sanitary sewer pipe, using water inversion Cured-in-Place Pipe technology, cleaning and closed circuit television inspection (before and after). A map of the project is attached.
On 9/28/10 the City Commission approved a bid date of 10/26/10 for this project. Four bids were opened at that time (bid tab attached) with Insituform Technologies USA, Inc. being the low bidder at $615,037.40.
The multi-year plan to rehabilitate the VCP within the sanitary sewer system proposed to construct approximately 91,800 feet of pipe rehabilitation each year. The project as bid will rehabilitate 28,460 feet of sewer main. The funding identified for the 2010 project is $982,000 and would allow an additional 17,500 feet of sewer main to be completed with the project. Staff has identified over 20,000 feet of sewer main for future CIPP projects that could be included with this project.
CIPP is a cost effective method of sewer main rehabilitation when compared with other more invasive methods. As an example, the cost of 8-inch sewer main rehabilitation for this project is $20.40 per foot and the bid received for the Delaware/New Hampshire project was more than $280.00 per foot for 8-inch sewer main.
Project Funding:
Funding for the 2010 Cured in Place Pipe project, $982,000, will come from the 2010 Capital Improvement Plan I/I Improvements, non-bonded construction fund.
Action Request:
Staff recommends:
Thank you for your assistance. Please advise if you have any questions.