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i <br /> t <br /> 1.0 BACKGROUND <br /> 1.1 PURPOSE <br /> The purpose of this work plan is to present the procedures to install triple probe <br /> soil gas monitoring well at Corral Hollow Sanitary landfill (CHSL). <br /> 1.2 SITE DESCRIPTION <br /> The CHSL is a closed, unlined Class III landfill located at 31130 South Corral <br /> Hollow Road, in southern San Joaquin County, approximately 5 miles south of <br /> the City of Tracy, at the intersection of Interstate 580 and Corral Hollow Road <br /> (Figure 1). The landfill covers approximately 58 acres, of which 43 acres was <br /> permitted disposal area. The remaining area is comprised of access roads, <br /> storm water retention ponds, setbacks for environmental monitoring, and <br /> firebreaks. Land within 1,000 feet of the facility is used for grazing and <br /> agriculture. The landfill ceased receiving waste in 1991. Currently the landfill is <br /> under post closure maintenance. As part of closure, the landfills perimeter is <br /> being monitored for off site migration of Landfill Gas (LFG) with seven soil gas <br /> monitoring wells (Figure 2). <br /> 1.3 REASON FOR INSTALLING SOIL GAS EXTRACTION WELL <br /> The lower probe of the existing soil gas monitoring well GW-1 has been found to <br /> be submerged. To provide an adequate well to monitor off site migration of <br /> landfill gas, near the vicinity of GW-1, the new soil gas monitoring well GW-1 A <br /> will be installed. The existing well will be retained per the request of San Joaquin <br /> County Environmental Health Department (EHD). <br /> 1.4 WELL LOCATION <br /> The new soil gas monitoring well will be installed at north western corner of <br /> CHSL near the existing well GW-1 (Figure 2). <br /> 2.0 DRILLING <br /> The Solid Waste Division will obtain drilling permits from EHD. The Solid Waste <br /> Division will notify EHD Unit 6 at least two working days in advance of drilling for <br /> an inspection. <br /> Drilling and completion of the well will be done by a licensed contractor. The <br /> contractor will be responsible to comply with the work plan and construct the well <br /> Work Plan—Soil Gas Monitoring Well Installation San Joaquin County <br /> Corral Hollow Sanitary Landfill Public Works Department <br /> Page 3 of 7 Solid Waste Division <br />