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i Corrective Action Financial Assurance Estimate rrl� EE-DD Corral Hollow Sanitary Landfill San Joaquin County AU August 9, 2006 ENV{R0NII'vIcNT NE.ALTH PeRjj1T/S4_R"1CES 1. INTRODUCTION 1.1 Purpose Corrective action financial assurance for a "reasonably foreseeable release" from a landfill is required under Sections 20380(b) and 22220-22222 of Title 27, California Code of Regulations. In order to satisfy this corrective action financial assurance requirement, the Discharger must estimate the cost of the corrective action taken to mitigate a "reasonably foreseeable release". This report documents the rationale, assumptions and results used in preparing the estimate. The approach used in developing the estimate is summarized below. 1. Assess the physical layout, geology, containment systems, environmental monitoring systems, and history of impacts to either groundwater or surface water. 2. Develop a hypothetical release scenario based on the data collection in Item 1. 3. Developed a hypothetical corrective action response to mitigate the impacts envisioned under the hypothetical release scenario. The extent and complexity of the corrective action response is proportional to the environment threat of the release and is consistent with the types and magnitude of corrective action commonly mandated by the Regional Water Quality Board at the time this document was prepared. 4. Costs are estimated for implementation of the corrective action based on the premise that the corrective action response will be designed and constructed by a third party. Costs presented in the estimate are typical for engineering and construction services rendered in the Northern Central Valley in 2006. 1.2 Description Site The Corral Hollow Sanitary Landfill located at 31130 South Corral Hollow Road and is owned by San Joaquin County. The landfill is located on a 58-acre parcel of which 43 acres received refuse fill. The site consists of a single landfill containing four modules and does not have a liner and a leachate collection and removal system. The landfill is a Class III Waste Management Unit and has not received waste since 1991. The landfill was closed October 1995. The closure cover consists of a 2 to 6-foot thick foundation layer under a 1-foot thick low-permeability soil layer, under a 1-foot thick vegetative 73467 1 August 9,2006 LA 21125 Corrective Action Financial Assurance Cost Estimate Corral Hollow Sanitary Landfill