03-19-1983 WS - Laserfiche WebLink

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SANITARY SEWER SYSTEM MAINTENANCE NEEDS Background Data The existing sanitary sewer system of three (3) main elements 1) the collection systemof 6 -inch to 36 -inch diameter pipe -- Pipe materials are vitrified clay VCP), reinforced concrete (RCP), polyvinyl chloride (PVCP) and cast iron (CIP); 2) lift stations -- four (4) of which are owned and maintained by the City and one which is owned and maintained by Metropolitan Waste Control Commission; and 3) MWCC 66 -inch diameter interceptor. The sanitary sewer varies in depth from 6 to 25 feet with the typical sewer being 9 to 12 feet deep. The majority of the system and three of the four lift stations were constructed in 1964 and 1965. Approximately 60 to 70 percent of the system was constructed prior to 1968. The collection system has been divided into nine drainage subareas. (See attached map.) Table S-1 summarizes the makeup of the subareas and system. The collection system contains approximately 14,650 lineal feet of sanitary sewer in two trailer parks. These pipes are private lines thus leaving a net system length of 215,685 feet. Condition of System In 1982 an Infiltration and Inflow (I/I) Analysis was conducted by TKDA. The study concluded, that based on E.P.A. criteria, no "excessive" (over 3,000 gpd/inch-mile) I/I existed within the system. The study did note a few subareas that had moderate I/I values. The I/I observations were based on flow recorders, calculated infiltra- tion rates and limited field inspections. Table S-2 ranks the infiltration rates based on flow recorder data. TABLE S-2 Table S-3 lists those Infiltration Rates Based on Low Flow Data I/I based on limited 1. Subarea 4, 5 & 6 Temp MH 2) 1510 gpd/inch - mile 2. Subarea 4, 5, 6 & 8 M-203) 1445 gpd/inch - mile 3. Subarea 7 & 9 M-202) 1300 gpd/inch mile 4. Subarea 1 & 2 Tem MH1) 1270 gpd/inch mile Table S-3 lists those portions of the system which were identified as having moderate I/I based on limited field inspections. 1