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IV. SANITARY SEWER IMPROVEMENTS . <br /> 1 . Definitions <br /> a) Sanitary Sewer Interceptors <br /> A network of relatively large diameter, deep sewer pipe and <br /> associated pumping stations and appurtenances. The interceptors <br /> are designed as collectors for large areas within the sanitary <br /> • <br /> sewer service area. <br /> b) 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 from <br /> 10 inch through 18 inch and extending away from respective <br /> interceptor mains. Pumping station, forcemains, trunks and <br /> • subtrunks are designed as collectors for areas usually less than <br /> 300 acres. • <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 costs <br /> due to extra depth (and/or oversizing) will be spread over the <br /> entire service district rather than becoming a burden on just <br /> those properties abutting that portion of the pipe network <br /> constructed. <br /> c) Sanitary Sewer laterals <br /> A network of pipes, usually 8 inch in size which are installed 8- <br /> 20 feet deep and are designed to serve those buildings abutting a <br /> given street or easement. The laterals drain to trunks, subtrunks • <br /> or directly to interceptors. <br /> 16 <br />