Memorandum

City of Lawrence

Utilities Department

TO:	David Corliss, City Manager Cynthia Wagner, Assistant City Manager Diane Stoddard, Assistant City Manager
FROM:	Bob Brower, Utilities Field Operations Manager
CC:	Dave Wagner, Director of Utilities Mike Lawless, Assistant Director of Utilities Philip Ciesielski, Assistant Director of Utilities Mark Hegeman, Utilities Operations Superintendent
Date:	09/20/2011
RE:	CIPP Rehabilitation – Project No. UT1004CS, Revised Change Order No. 2

Please include the following item on the City Commission Agenda for consideration at the September 27, 2011 meeting:

Approval of a revised Change Order No. 2 for Project No. UT1004CS with Insituform USA in an amount of $182,500 for a new contract total amount of $1,135,782.75.

Background:

The Utilities Department conducted smoke testing on interceptor sanitary sewer mains on 08/18/2011. The interceptor mains are located between East 15^th street and East 11^th street and Haskell Avenue and Delaware. See attached map. The interceptor mains run through a stormwater drainage area. The smoke test revealed three line segments that emitted heavy smoke up through the ground. The smoke indicates pipe defects where water can enter the sanitary sewer system. TV inspection of one of the lines, a 12” vitrified clay pipe (vcp), found cracked pipe, separated pipe joints, tree root intrusion, and holes in the pipe. Two of the interceptor segments are 24” vcp mains that total 892 feet in length and one is a 12” vcp main that totals 290 feet in length. The total length of the three pipe segments is 1,182 feet.

The City is currently under contract with Insituform USA to provide cured-in-place-pipe (CIPP) lining for the Department through November of 2011. The contract allows the City to mobilize Insituform for additional work outside of the scope of work contained in the bid documents. The bid provides different cost points based on the mobilized length of sewer mains to be lined. To receive the best pricing options, the mobilization must be for more than 2,500 feet. Work on Phase II of the contract was completed on July 23, 2011.

On August 23, 2011, the City Commission approved Change Order No. 2 with Insituform to increase the contract amount to $1,091,983.

Status

Two of the line segments included in Change Order No. 2 had manholes (MHs) that were buried. During the process to find and raise the MHs, it was discovered that the 24” sewer main has no MH in the area expected. It appears at one time there may have been a MH but it was removed due to its proximity to the creek. This will increase the length of 24” sewer main to receive CIPP lining and decrease the length of 8” main to be lined to meet the 2,500 feet that is a minimum for mobilization. This also increases the cost of Change Order No. 2, which has not been processed due to the changed conditions. The revised cost of Change Order No. 2 is $182,500 for a total contract amount of $1,135,782.75.

Request

Recommend approval of a revised Change Order No. 2 for Project No. UT1004CS with Insituform USA in an amount of $182,500 for a new contract total amount of $1,135,782.75.