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Non-Water Release Corrective Action Plan Corral Hollow Sanitary Landfill • 1.0 INTRODUCTION This report presents a Site Specific Non-Water Release Corrective Action Plan (NWRCAP) that addresses the potential damage that can be caused by a reasonably foreseeable causal event that exceeds the landfill's existing design standard in accordance with CCR Title 27, Section 22101. Potential reasonably foreseeable causal events, to be considered, as identified by the California Department of Resources Recycling and Recovery (CalRecycle) Proposed Best Management Practices (BMPs) (see Section 8.0 for reference) for Preparing Site-Specific Non-Water Quality Corrective Action Plans, include: earthquakes, precipitation,flooding, fire, seiche, and tsunami. 1.1 BACKGROUND The Corral Hollow Sanitary Landfill (CHSL) is a closed, unlined Class III landfill located at 31130 South Corral Hollow Road, approximately 5 miles south of the City of Tracy (City), at the intersection of Interstate 580 and Corral Hollow Road (Figure 1). The landfill area covers approximately 58 acres, of which 44.6 acres were permitted for waste disposal. The remaining area is comprised of access roads, stormwater retention ponds, setbacks for environmental • monitoring, and firebreaks. The surrounding land use is for agriculture (farming and livestock grazing). When active, the landfill was operated in accordance with Solid Waste Facility Permit issued by County of San Joaquin, Environmental Health Department and Waste Discharge Requirements (WDRs) order number 94-259 issued by Regional Water Quality Control Board (RWQCB). Historically, the landfill received solid waste in the form of municipal waste, tires, construction and demolition debris, and commercial waste from both the public and contract carriers. The CHSL was jointly owned jointly by the County and the City between August 1947 and July 1990. Under that contract, the City was fully responsible for landfill operations. By County Resolution Number 90-224, the County acquired full ownership and operation of the CHSL on July 1, 1991. In 1996, the CHSL was certified closed with the installation of the final closure cap. The cap consists of a 2- to 6-foot foundation layer under a 1-foot minimum thick low-permeability soil layer, covered by a 1-foot thick vegetative soil layer. Installation of the groundwater monitoring well network and landfill gas migration monitoring well network occurred prior to • final closure. 1 Geo-Logic ASSOCIATES