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Non-Water Release Corrective Action Plan <br /> Corral Hollow Sanitary Landfill <br /> • The sediments below the Corcoran Formation are dry until the deep aquifer is encountered at <br /> depths of over 300 feet. The deep aquifer is found at an elevation of approximately -45 to -57 <br /> feet (MSL), at a depth from approximately 300 to 350 below the surface. Groundwater flows in <br /> the deep aquifer to the northeast. <br /> 2.2 SURFACE WATER HYDROLOGY <br /> The CHSL is bound to the west by the Diablo Mountain Range and to the east by the San <br /> Joaquin Valley flatlands. The landfill is located adjacent to Corral Hollow Creek (to the south) <br /> which is fed from the mountains to the west and flows to the lower valley to the east. <br /> Due to the location of the landfill, run-on from the west is diverted into the Corral Hollow Creek <br /> or to the western retention basin on-site and run-on from the north reaches the site through a <br /> culvert crossing Corral Hollow Road, and is diverted along Corral Hollow Road to the west. <br /> Run-off from the landfill is diverted into mid-slope drainage benches and perimeter ditches <br /> which direct flow into the western or eastern stormwater retention basins. The western <br /> retention basin collects run-off from the top deck, southern top slopes (to the mid-slope <br /> • bench), and western side slope areas. The eastern retention basin collects run-off from the <br /> northern slope and southern and eastern lower side slope areas. <br /> 3.0 LANDFILL CONFIGURATION <br /> This section of the NWCAP describes the existing landfill environmental control systems and <br /> surface water control systems. <br /> 3.1 LANDFILL GAS MIGRATION MONITORING AND CONTROL SYSTEM <br /> The CHSL has a perimeter landfill gas migration monitoring system that consists of 9 soil gas <br /> wells (GW-1 through GW-9) and a landfill gas control system that constists of 51 landfill gas <br /> extraction wells (EW-1 through EW-51). The landfill gas control system also includes various <br /> laterals, headers, condensate sumps, and a flare station. <br /> 3.2 GROUNDWATER MONITORING SYSTEM <br /> The groundwater monitoring network consists of 6 monitoring wells: four monitoring the <br /> shallow aquifer perched on the Corcoran clay layer east of the CHSL, and two monitoring the <br /> . deep aquifer. <br /> 3 Geo-Logic <br /> ASSOCIATES <br />