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' .47,7 .-„b, r fir, • a x?�,a• ++.- .r;a 62-701.500(8) LEACHATE MANAGEMENT Segment 2 Leachate Collection/Conveyance System Leachate is a by-product of landfills, resulting from infiltration of rainfall and moisture created by decomposition, consolidation, and compression of waste materials. It is collected from the Segment 2 Class I landfill by a network of six inch diameter HDPE pipes located at natural grade and above an impermeable liner. These pipes.are perforated along the lower sections, and have been installed in ballast rock bedding surrounded with filter fabric to collect liquid leachate and trap sediment. Solid debris is blocked from entering the pipes by the rock and filter. The pipes connect with 8 and 10 inch diameter polyvinyl chloride (PVC) gravity lines, buried a minimum of three feet below grade, which drain to a series of manholes located on the east and west sides of Segment 2. The closed Segment 1 Class I disposal area is unlined except for an intermittent natural clay layer just below natural grade. Segment 2 leachate flows to a single pump station located at the northwest corner of Segment 2. Since 1988, this pump station has primarily served as a sump for leachate storage. The duplex pump system provides capacity for approximately 350 gpm/pump against a total dynamic head of 27 feet. The pumps were used from 1988 to 1993 to pump leachate to tanker trucks which transported leachate to the Indian River County West Regional Wastewater Treatment Facility. In late 1993, the SWDD entered into an agreement with the Indian River County Wastewater Department for direct forcemain conveyance of leachate to the West Regional Wastewater Treatment Plant. The SWDD contracted to install a six-inch diameter forcemain on Rangeline Road to Oslo Road, connecting into the existing Oslo Road forcemain. Beginning in February, 1994, the SWDD began to pump an average of F-15 S-.ROi; Ih.,