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stock and domestic uses. The future use is not expected to change. <br /> 7 . 0 SITE DEVELOPMENT PLAN <br /> Landfill operations started in 1967 . Approximately 80 acres have <br /> received waste to date. The remainder of the site will be <br /> developed in modules. The tentative sequence of future landfill <br /> modules and the existing fill area are shown on drawing 3 in the <br /> Preliminary Closure Plan (Appendix A) . Excavation will proceed one <br /> module ahead of refuse fill to provide daily cover material and <br /> ensure that landfill operations can continue once a module has been <br /> completed. <br /> Minimum final landfill top slopes of 3 percent are maintained to <br /> provide adequate drainage and prevent ponding. Drainage control is <br /> handled by collecting sheet flow runoff in the landfill perimeter <br /> ditches which are directed to the existing drainage channel on the <br /> east side of the property. <br /> Maximum final landfill slopes are constructed not steeper than 12 <br /> percent along the perimeter slopes to minimize erosion. The final <br /> landfill cover will be constructed to meet all applicable state and <br /> federal regulations in force at the time it is to be constructed. <br /> The final cover will be placed and vegetated as landfill modules <br /> are brought to final grade. The vegetation will minimize erosion, <br /> promote evapotranspiration, and blend in with surrounding <br /> vegetation. Drawing 2 of Appendix A shows existing topography and <br /> proposed final elevations for the site. <br /> 8 . 0 GEOLOGY, SOILS, AND GROUND WATER <br /> The County hired Kleinfelder Inc. in 1985 to perform a Geologic <br /> Investigation (Appendix E) for the Foothill Sanitary Landfill. The <br /> following is a summary of this investigation. <br /> 8 . 1 GEOLOGY <br /> The Foothill Sanitary Landfill is located on the eastern edge of <br /> the Great Central Valley geologic province. The Great Valley is an <br /> asymmetrical trough filled with a thick sequence of flat lying <br /> marine and continental sediments. The site is located in an area <br /> underlain by volcanic flows and sediments. These deposits have <br /> since been eroded and weathered to form the present-day low, <br /> rolling-hill topography. <br /> The site is underlain by alluvial deposits of the Laguna Formation <br /> overlying the Mehrten Formation. The Laguna Formation consists of <br /> consolidated gravels, sandstones, and siltstones. The slightly <br /> older Mehrten Formation generally consists of sandstone and <br /> siltstone, with conglomerate layers and claystone or mudstone. <br /> is 24 <br />