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ti' <br />M <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 />r r - <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 />