R2000-35 ACCEPTING THE BID AND AUTHORIZING A CONTRACT

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. � . OF'�EC ~ 9C V 70 �:1:� '/[L I N O�S� March 14,2000 PUBLIC WORKS MEMORANDUM NO.2000-14 MEMORANDUM TO: Honorable Mayor and City Council FROM: Steve Ga City Manager � Bruce Mc ,P.E.,Director of Public Wo ks 8 Stephen P. anson,P.E., City Engineef��f Thomas N Odenigbo,P.E.,Civil Engineer II(Sanitary Sewerj�L. _ SUBJECT: Jasper/Southeast Sewer Rehabilitation ', City Project 9955 Jas er Street / Southeast Sewer is a combined storm and sanita sewer and consists of a main P �' sewer and a relief sewer(refer to attached locale map). This section of sewer is categorized as critical by , City staff, because of the potential effects and cost of replacement should it fail. The main sewer was constructed in about 1890, and the relief sewer was constructed about 1942. Presently,this sewer system suffers from structural decay due to hydrogen sulfide and age. This has resulted in moderate to heavy infiltration and inflow of ground water and storm water into the sewer system. The materials of the sewer vary from brick to reinforced concrete with a short segment of corrugated metal pipe. The sewer system varies in both cross sectional size and material, and is about two miles long. There are three cross sectional shapes in the sewer system. It includes elliptical shaped sewer ranging in size from 34-inches wide by 51-inches high to 42-inches wide by 63-inches high; circular shaped sewers ranging from 36-inches to 72-inches diameter; and a 500-foot long section of rectangular shaped culvert 11 '/2-feet wide by 2 '/z-feet high. The design of the rehabilitation to this sewer was prepared by City Staf£ The project was divided into three phases, because of the variation in cross sectional shapes. Each phase is independent from the other and bidders were encouraged to bid on any number of phases. Two alternate materials were specified for Phase I and Phase II to ensure competitive prices from contractors. The two materials are high density polyethylene involving a cured-in-place process and reinforced concrete installed by a guniting process. The rehabilitation material for the third phase was specified as an applied lining material. City staff will provide the construction management and inspection of this project.