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� IV. SANITARY SEWERIMPROVEMEHT$ <br />1, Oefinitions <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 />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 oversizingl will be spread over the <br />entire service district rather than becoming a burden on j ust <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 />