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Corral Hollow LFG System Audit and Upgrade Report o An Operations Procedures Document (OPD) that describes steps to be taken to operate, monitor and maintain the GCCS to ensure that LFG extraction is ' continuously optimized. This OPD report, prepared in response to Task No. 2.c. of the CDO, is provided in Appendix B. Although not a requirement of the CDO, this Report also provides recommendations for GCCS 1 system enhancements, as necessary, to ensure that adequate VOC control may be achieved to meet regulatory requirements, including addressing concerns set forth in the CDO. , SOURCE CONTROL BACKGROUND General Site Information ' The Corral Hollow Landfill is a closed Class III landfill owned and operated by the County and ' is located at 31130 South Corral Hollow Road, in Tracy, California. The closed Site is permitted under Solid Waste Facility Permit(SWFP)No. 39-AA-0005. The closed waste disposal area is single unlined waste management unit (WMU) approximately , 45 acres in area within the 58-acre property. Refuse disposal began in the area of the CHLF in the 1950's. The Site was operated by the City ' of Tracy from 1946 to 1991 at which point the County assumed full ownership and operational responsibility. , The County ceased accepting waste in 1995 and formal closure was completed in 1996. Approximately 500,000 tons of municipal solid waste (MSW) were disposed of at the Site over ' this period (CalRecycle Solid Waste Information System [SWIS] database). Surface elevations of the current landfill area range from about 250 feet mean sea level (MSL) at ' the toe of refuse side slopes to approximately 345 feet MSL at the top deck. Side slopes of the closed area of the Site are generally 5:1 (H:V). A site plan showing property boundaries, current topography and key site features is provided as Figure 1. A final cover was installed over 43 acres in 1996 as prescribed in Title 27 of the California Code ' of Regulations (27 CCR). This cover consists of a foundation layer of soil that varies from 2 to 6 feet thick, overlain by a low-permeability soil layer that is a minimum of 1-foot thick. The low- , permeability soil is an engineered mixture of selected soil and red clay. A nominal 1-foot thick vegetative layer of compacted soil was placed over the low-permeability soil, and the completed surface was hydroseeded after placement. ' Investigation by the County in 2007 revealed that an additional 1.6 acre area contained refuse but was not enclosed within the final cover area. In addition, refuse was found to extend beyond the County property into property now owned by the State of California and administered by the Department of Transportation (Caltrans). Closure of this additional area, comprised of both County and Caltrans property, includes an engineered alternative cover consisting of a vegetated ' soil layer, geomembrane, geocomposite drainage layer, and foundation soils to meet the 2 December 2013