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<br />III. SANITARY SEWER IMPROVEMENTS <br /> <br />A. Definitions <br /> <br />1. MWCC Sanitary Sewer Interceptors <br />A network of relatively large diameter, deep sewer pipe and <br />associated pumping stations and appurtenances owned and operated by <br />the Metropolitan Waste Control Commission (MWCC). The <br />interceptors are designed as collectors for large areas within the <br />sanitary sewer service area. <br /> <br />2. Sanitary Sewer Trunks and Subtrunks <br />Sanitary sewer pumping stations including associated forcemain <br />and/or a network of gravity pipes ranging in size generally <br />from 10 inch through 15 inch and extending away from respective <br />MWCC interceptor mains. Pumping station, forcemains, trunks and <br />subtrunks are designed as collectors for areas usually less than <br />300 acres. <br /> <br />Because sewer lines flow by gravity, the pipes can become quite <br />deep at some locations and very costly to install. A trunk or <br />subtrunk assessment is, in certain cases, utilized so that <br />costs due to extra depth (and/or oversizing) will be spread <br />over the entire service district rather than becoming a burden <br />on just those properties abutting that portion of the pipe <br />network constructed. <br /> <br />7 <br />