R2000-158 ACCEPTING THE BID AND AUTHORIZING THE EXECUTION OF A CONTRACT

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,! oF'DEc � 9� - C V 7c � �i1:i� '/[LINO�S September 13, 2000 ENGINEERING & INFRASTRUCTURE MEMORANDUM NO. 2000 - 13 MEMOR.ANDUM TO: Honorable Mayor and City Council FROM: Steve Garman, City Manager Matthew C.Newell, P. E., �� Acting Director of Engineering& Infrast t��r ( William A. Ratekin, Acting City Engineer��' rl� Thomas N. Odenigbo, P.E., Civil Engineer II (Sanitary Sewer�6 SUBJECT: Upper Broadway Sewer City Project 9833 The Upper Broadway is a combined sewer, that portion of Broadway Sewer extending upstream from the junction structure at Prairie Street (refer to attached location map). It is of egg-shaped brick construction varying in size from 28-inches wide by 42-inches high to 48-inches wide by 72-inches high. This section of sewer is categorized by City staff as critical, because of the potential effects and costs of replacement should it fail. This 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 recommended rehabilitation process will involve lining the entire inside surface of the sewer with mortar by the process of guniting. City staff believes that the rehabilitation of this sewer will renew the sewer and improve on the structural integrity, the hydraulic efficiency and effectiveness, corrosion resistance, and reduce inflow and infiltration of both storm and ground water into the system. This project does not involve rehabilitation of manholes structures that are part of this sewer system. The design and contract documents of the rehabilitation to this sewer were prepared by City staff. City staff will also provide the construction management and inspection of this project.