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7.2.4.1.1 Surface Water <br /> Perhaps the most obvious means by which WMU fluids can impact waters of the <br /> state is by direct contact between surface waters and refuse. The presence of <br /> effective drainage controls at the Forward Landfill will minimize that potential <br /> condition. All wastes at the Forward Landfill facility will be separated from the <br /> North Branch and South Branch of Little Johns Creek by a levee system that has <br /> been designed to protect the site from.a 100-year flood event. Accordingly, <br /> creek waters will not come in contact with wastes, and the only potential surface <br /> water impact is related to controlled run-off from the site."The surfacewater <br /> control system on the landfill is deli d.ior:a..],,IJDO-ygaJir;.24-hour storm event <br /> and will divert run-on from properties surrounding the site. <br /> 7.2.4.1.2 Vadose Zone <br /> The vadose zone is the unsaturated..soal.zone.above.the_groun.dwater table, The <br /> Forward Landfill site is located in an area where the vadose zone is typically <br /> about 60 to 100 feet thick. In semi=arid areas­similarto Stocictan; subsurface <br /> movement of landfill gas is considered the most significant means by which the <br /> vadose zone may be affected by the WMU. Although the expanded landfill will <br /> be equipped with a composite liner system, small volumes of leachate may <br /> migrate through minute defects in the liner and migrate to the vadose zone. <br /> 7.2.4.1.3 Groundwater <br /> If waste constituents reach groundwater, the natural groundwater flow gradients <br /> and the dispersive properties of the specific contaminants would determine how <br /> groundwater impacts will migrate from the site. At the Forward Landfill, <br /> groundwater typically flows in a northerly to northeasterly direction in <br /> accordance with the regional gradient. <br /> 7.2.4.2 ANTICIPATED METHODS OF MITIGATION <br /> The following discussion identifies the "worst case" release scenario that could <br /> reasonably be expected at the site, and the mitigation measures that are <br /> anticipated to respond to such conditions. <br /> Forward Landfill JTD 7-7 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-7.0:08/20/01 <br /> BRYAN A.STIRRAT S.ASSOCIATES <br />