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I. BACKGROUND 1.0 PURPOSE The purpose of this Work Plan is to present the procedures for installing two addition- al Landfill Gas (LFG) Migration Monitoring (soil gas) wells GW -8 and GW -9 at Corral Hollow Sanitary landfill (CHSL). 2.0 SITE DESCRIPTION CHSL is a closed, unlined Class III landfill located at 31130 South Corral Hollow Road, in southern San Joaquin County, approximately 5 miles south of the City of Tracy, at the intersection of Interstate 580 and Corral Hollow Road (Figure 1). The landfill property includes approximately 58 acres, of which 43 acres are a permitted disposal area. The remaining area is comprised of access roads, storm water reten- tion ponds, setbacks for environmental monitoring, and firebreaks. Land within 1,000 feet of the facility is used for grazing and agriculture. The landfill was certified closed in 1996. Currently the landfill is under postclosure maintenance. As part of closure, the landfill's perimeter is being monitored for off-site LFG migration with seven soil gas wells (Figure 1). 3.0 REASON FOR INSTALLING SOIL GAS WELLS The additional wells are required by Regional water Quality Control board (RWQCB). These wells will allow to closer monitoring of potential off-site LFG migration along the northeastern side of the landfill. 4.0 WELL LOCATION The additional soil gas wells will be installed at northeastern side of CHSL (Figure 1). Well GW -9 will be installed in Caltrans right-of-way. An encroachment permit for the installation of the soil gas well in Caltrans property has been secured by Solid Waste Division (SWD). A copy of the encroachment permit was submitted to San Joaquin County Environmental Health Department (EHD) for the original permit application. The, location of the additional wells is as far from the from refuse limit as possible but within the landfill property; thus, excavation of refuse or contact with refuse is not ex- pected during drilling. The well locations will be adjusted if necessary based on the field conditions. Work Pian -soil Gas Well Installation Page 1-4— Solid Waste Division Corral Hollow Landfill Public Works Department