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 Utilitie Mark Hegeman, Utilities Operations Superintendent
Date:	08/22/2011
RE:	CIPP Rehabilitation – Project No. UT1004CS, Change Order No. 2

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 (vpc), 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.

In addition to the 1,182 feet of interceptor mains, the Department has identified an additional 1,350 feet of 8” sanitary sewer mains from the draft inflow and infiltration maps from the Wastewater Master Plan. This would bring the mobilization to a total of 2,532 feet. The cost of the additional work is $138,700.

The approved contract amount with Insituform is $982,000. However, based on the actual lengths of sewer mains completed, the contract total cost is $953,282.75. Change order No. 2 would increase the contract amount by $109,983 to $1,091,983.

Request

Recommend approval of Change Order No. 2 with Insituform USA in an amount of $109,983 for a new contract total amount of $1,091,983.