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Huljll#�3 e R] `I 7 <br />1.1 PURPOSE <br />The purpose of this work plan is to present the procedures to install a triple probe soil gas <br />monitoring well (GW1-A) at Corral Hollow Sanitary landfill (CHSL). This work plan <br />includes the new well design for GW -1A to accommodate the possible need to inspect <br />the interior of the well's probes. <br />1.2 SITE DESCRIPTION <br />The CHSL is a closed, unlined Class III landfill located at 31130 South Corral Hollow <br />Road, in southern San Joaquin County, approximately 5 miles south of the City of Tracy, <br />at the intersection of Interstate 580 and Corral Hollow Road (Figure 1). The landfill <br />covers approximately 58 acres, of which 43 acres was permitted disposal area. The <br />remaining area is comprised of access roads, storm water retention ponds, setbacks for <br />environmental monitoring, and firebreaks. Land within 1,000 feet of the facility is used for <br />grazing and agriculture. The landfill was certified closed in 1996. Currently the landfill is <br />under post closure maintenance. As part of closure, the landfills perimeter is being <br />monitored for off site migration of Landfill Gas (LFG) with seven soil gas monitoring wells <br />(Figure 2). <br />1.3 REASON FOR INSTALLING GW1-A <br />The lower probe of the existing soil gas monitoring well GW -1 has been found to be <br />submerged. To provide an adequate well to monitor off site migration of landfill gas, near <br />the vicinity of GW -1, the new soil gas monitoring well GW -1A will be installed. The <br />existing well will be retained per the request of San Joaquin County Environmental Health <br />Department (EHD). <br />1.4 WELL LOCATION <br />The new soil gas monitoring well will be installed at north western corner of CHSL near <br />the existing well GW -1 (Figure 2). <br />The Solid Waste Division will obtain drilling permits from EHD. The Solid Waste Division <br />will notify EHD Unit 6 at least two working days in advance of drilling for an inspection. <br />Work Plan — Soil Gas Monitoring Well (GW1-A) Installation <br />Corral Hollow Sanitary Landfill <br />April 3, 2008 Page 3 of 7 <br />San Joaquin County <br />Public Works Department <br />Solid Waste Division <br />