Memorandum

City of Lawrence

Utilities Department

TO:	Diane Stoddard – Interim City Manager Casey Toomay - Assistant City Manager Brandon McGuire – Assistant to the City Manager
FROM:	Nicholas Hoyt – I/I Manager
CC:	Dave Wagner – Director of Utilities Mike Lawless – Deputy Director of Utilities Philip Ciesielski – Assistant Director of Utilities Beth Krishtalka – Assistant to Director Bob Brower – Utilities Operations Superintendent
DATE:	November 25, 2015
RE:	Set a bid date for Bid No. B1564 - UT1508 2015 Sanitary Sewer Rehabilitation CIPP Project

History

The Integrated 2012 Wastewater Utilities Plan identified two programs for sanitary sewer rehabilitation, the Sewer Rehabilitation and Replacement Program and the Rapid Inflow/Infiltration (I/I) Reduction Program. These are multi-year plans to rehabilitate and remove I/I from the sanitary sewer system. Both Programs will use Cured-In-Place-Pipe (CIPP) as a main rehabilitation strategy.

Part of the Utilities Department’s efforts at I/I reduction is to repair/reconstruct existing sewer lines that are a source of I/I. CIPP is one of the methods used. The CIPP method involves lining the inside of an older deteriorated sanitary sewer main without excavation. Therefore, there is very little disruption above ground.

The Utilities Department has a multi-year plan to rehabilitate city owned infrastructure using this trenchless method. Line segments are selected for rehabilitation based on several factors. These factors include:

· Known defects based on maintenance and TV inspection records

· Pipe Age

· Pipe Material

· Presence of unused taps or connections that may contribute inflow/infiltration

· Depth

· Above ground conditions

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 $22.50 per foot compared to open trench sewer replacement projects that have averaged more than $300 per foot for 8-inch sewer main.

Project Summary

The proposed rehabilitation project consists of, but is not limited to, the lining of 41,791

linear feet of sanitary sewer pipe between 6-inches and 36-inches in diameter. A total of 24,672 linear feet of this project is associated with Phase 2 of the Rapid I/I reduction program. Quantities of specific pipe sizes included in the project are summarized below:

• 540 linear feet of 6-inch sanitary sewer pipe
• 30,125 linear feet of 8 inch sanitary sewer pipe
• 160 linear feet of 10-inch sanitary sewer pipe
• 5,019 linear feet of 12-inch sanitary sewer pipe
• 1,628 linear feet of 15-inch sanitary sewer pipe
• 3,182 linear feet of 21-inch sanitary sewer pipe
• 1,054 linear feet of 24-inch sanitary sewer pipe
• 11 linear feet of 30-inch sanitary sewer pipe
• 72 linear feet of 36-inch sanitary sewer pipe

The proposed sewer rehabilitation will be completed using water or air inversion CIPP technology, cleaning and closed circuit television inspection (before and after). An overview map of the project is attached.

UT1508 will also include a sanitary manhole rehabilitation project. The manhole rehabilitation project will be bid following the completion of this project in 2016.

Project Funding

Funding for the 2015 Cured in Place Pipe project will come from the 2015 Capital Improvement Plan I/I Improvements.

Action

Set a bid date of January 5, 2016 for Bid No. B1564 - UT1508 2015 Sanitary Sewer Rehabilitation CIPP Project.