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C 1. BACKGROUNI The purpose of this work plan is to present the procedures to install two additional Landfill Gas (LFG) Migration Monitoring (soil gas) wells (GW -8 and GW -9) at Corral Hollow Sanitary landfill (CHSL). 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 retention 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 will be installed as 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 corner of CHSL (Figure 1). Well GW -9 is planned to be installed in Caltrans right-of-way. An encroachment permit for the installation of the soil gas well in Caltrans property will be secured by Solid Waste Division (SWD) prior to the start of construction. The location of the additional wells is away from refuse limit; thus, excavation of refuse or contact with refuse is not expected during drilling. The well locations will be adjusted if necessary based on the field conditions. Work Plan -Soil Gas Well Installation Page 1 of 5 Solid Waste Division Corral Hollow Landfill Public Works Department