1991-01-14 Regular Meeting - Laserfiche WebLink

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RE ST FOR CITY COUNCIL AGEND TEM Agenda Date Requested: Janua_ry/J14, 1991 / j Requested By: Steve Gillett ~'~~~ Department: XXXX Public Works Report Resolution Ordinance Exhibits: Proposal from Insituform Gulf South Cost Summary 1990-91 Utility CIP Fund Summary SUMMARY & RECOMMENDATION The 15 inch concrete trunk sewer line located along Big Island Slaugh has experienced several structural failures over the past several years. These failures have occurred due to corrosion of the cancrete above the flow line, resulting in several collapses. Due to the large area served by this line, Public Works candur_ted a televised insper_tion, which was recently completed. Originally, it wa.s concluded that the 400 foct segment experiencing the failures should be repaired, due to extensive corrosion indicated by the tape. However, an additional 72S foot. segment of 15 inch cancrete shows signs of deterioration, and should also be considered for rehabilitation, from a preventative maintenance standpoint, for a total of 1,130 feet. Due to the location of this line in the rear of homes, the number of fenr_.es to be removed, tree removal and the location of adjacent utilities, it is estimated that replacement would cost in excess of $100,000. The City has utilized the Insituform process from Insituform Gulf. Sauth in the past, with exr_ellent results, an a project similar in size, scope and construction difficulty. The process utilizes a resin-impregnated fiberglass liner pushed through the pipe using water pressure. The liner is cured in place using heated water circulated inside the pipe, with individual service taps reestablished using a robotic cutter with a tv camera. The insertion and curing is acr_omplished in one day, with service taps the following day. No excavation is necessary. It is a patented process licensed to Insituform Gulf South of Pasadena, and falls under the health, safety and welfare exemption of Texas statutes. Insituform has proposed to line 1,130 feet of 15 inch pipe, reestablish service taps, and by-pass pumping during the process far an estimated amount of seventy two thousand and seveny dollars ($72,070.OU). This price assumes 1,130 feet of pipe, ten service taps and ap~_~ruximately 12 hours of by-pass pumping, per the attached proposal. Fifty thousand dollars ($50,000) was budgeted far this project in the Utility CIF Fund.. The additional twenty two thousand and seventy dollars ($22,070.00) needed is available in the Utility CIP Fund Contingency. Although the additional line segment has ~=et to experienr_e structural failure, it is rer_ommended that the City include this portian while rehabilitation is performed on the original 400 feet, and award the contract to Insituform Gulf South as a sole sourr_e vendor for the rehabilitation of 1.,130 feet of 15 inch sewex•. Action Required by Council: Award a contract as sole source vendor to Insituform Gulf South for the rehabilitation of 1,130 feet of 15 inch sewer in the amount of seventy two thousand and seventy dollars ($72,070.00). Availability of Funds: General Fund Water!Wastewater XXXlCapital Improvement ___ ___ General Revenue Sharing Other Account Number: Utility CIP Fund Funds Available: XXX YES NO A roved or City Counci_ Aclenda Rcbert T. Herrera DATE City Manager