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1.0 BACKGROUND <br /> 1.1 GENERAL <br /> Corral Hollow Sanitary Landfill (CHSL) is a closed, unlined Class III landfill located <br /> at 31130 South Corral Hollow Road, in southern San Joaquin County, <br /> approximately 5 miles south of the City of Tracy, at the intersection of Interstate <br /> 580 and Corral Hollow Road. The landfill covers approximately 58 acres, of which <br /> 43 acres was permitted disposal area. The remaining area is comprised of access <br /> ' roads, 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. <br /> In 1996, CHSL was certified closed with the installation of the closure cap, Landfill <br /> gas (LFG) migration monitoring wells and groundwater monitoring wells. The cap <br /> consists of a 2-to 6-foot foundation layer under a 1-foot minimum thick, <br /> low-permeability soil layer, with a 1-foot thick vegetative surface layer. <br /> 1.2 LFG MIGRATION MONITORING <br /> CHSL currently has seven triple-probe perimeter monitoring wells. Two additional <br /> wells will be installed in 2013 (Figure 1). All wells have a lockable enclosure, <br /> which are labeled with the designated well number. <br /> Each perimeter well monitors the shallow, intermediate and deep sub-surface soil <br /> layers for off-site migration. Each probe is color coded to represent its depth. <br /> Color red identifies shallow probe, color blue identifies the intermediate probe, and <br /> 1 gold color identifies the deepest probe. Well logs of the perimeter probes are <br /> available upon request. <br /> ' 1.3 LFG COLLECTION AND CONTROLLED SYSTEM <br /> In 2001, a LFG collection and controlled system (LFGCCS) was installed to <br /> control: <br /> • LFG perimeter off-site migration. <br /> • LFG surface emissions from the cover. <br /> • Groundwater impact from the volatile organic compounds. <br /> The LFG system includes a flare station and 44 LFG extraction wells currently <br /> installed in refuse. The LFG extraction wells vary from approximately 25 to 92 feet <br /> ' in depth. A typical vertical LFG extraction well casing consists of of 6-inch <br /> diameter high density polyethelene (HDPE) pipe. All LFG extraction wells are <br /> connected by laterals to a HDPE header buried in the vegetative layer of the <br /> LFG Operation And Maintenance Pan San Joaquin County <br /> Corral Hollow Sanitary Landfill 2 Public Works Department <br /> October 26,2012 Solid Waste Division <br />