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a i t Corrective Action Financial Assurance Estimate Harney Lane Sanitary Landfill San Joaquin County May 25, 2007 I ' INTRODUCTION 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 I 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 j the estimate is summarized below. i Assess the physical layout, geology,containment systems, environmental monitoring systems, and history of impacts to either groundwater or surface water. jDevelop a hypothetical release scenario based on the data collection in Item 1. Develop an evaluation monitoring program to determine the lateral and vertical extent of release from the landfill 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 in consistent with the types and magnitude of corrective action commonly mandated by the Regional Water Quality Board(RWQCB) at the time this document was prepared. 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. Site Description 4 The Harney Lane Sanitary Landfill is located at 14750 East Harney Lane and is owned by San Joaquin County. The landfill is located on a 127-acre parcel of which 94 acres received refuse fill. The landfill is an unlined Class III Waste Management Unit that has not received waste since 1991. The Unit does not utilize a leachate recovery system. The landfill was closed in October 1994. Waste discharge included commercial and household waste, construction/demolition waste, and agricultural waste. The site is bordered by agricultural land. Corrective Action Financial Assurance Cost Estimate 1 May 25,2007 Harney Lane Sanitary Landfill San Joaquin County Public Works Department i 1 2