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2 SITE DESCRIPTION AND BACKGROUND 2.1 SITE DESCRIPTION The Facility is located at 3242 South EI Dorado Street in Stockton, California (Figure 1). As shown on Figure 2, The Central Pacific Railway bounds the southeastern length of the site; The Union Pacific Railroad bounds the western edge of the site; a metal recycling yard, Universal Service Recycling, bounds the site to the north; Duck Creek, which flows west and empties into Walker Slough at the Union Pacific Railroad, bounds the site to the south. According to the County Assessor records, the site property (APN 177-02-29) comprises 8.69 acres. In addition, the northern extension of the landfill, which is owned by Universal Service Recycling, is included in this evaluation. This area is visible on Figure 2 as a triangular shaped parcel that extends northward from the eastern portion of the site. The part of the landfill on Universal Service Recycling covers approximately 2.5 acres, bringing the total landfill footprint to approximately 11.2 acres. 2.2 SITE HISTORY On June 28, 2007, Cove Contractors received a document titled Notice of Adoption of Waste Discharge Requirements for Cove Contractors Landfill, Cove Contractors, Inc. and EI Dorado Property Management, San Joaquin County (WDR) from the Central Valley Regional Water Quality Control Board (RWQCB) (Order No. R5-2007-0084). The WDR required Cove Contractors to submit quarterly and semi-annual groundwater and landfill gas monitoring reports in order to meet the evaluation, detection, and corrective action monitoring specifications for the groundwater monitoring wells and landfill gas probes located on the Site. Landfill gas data evaluated from the fourth quarter of 2007 reported methane concentrations above the regulatory limits of 5% (v/v) methane in the perimeter gas probes as specified in 27 CCR 20921(a)(2). Due to the elevated methane concentrations, the CIWMB conducted a site inspection on March 4, 2008. Field samples collected by the CIWMB during the inspection confirmed the elevated methane concentrations reported in the previous monitoring event. The CIWMB subsequently issued a violation for the high methane concentrations in a letter titled State Inspection Report for Cove Contractors Landfill, Facility SWIS No. 39-AA-0010, dated March 25, 2008. Therefore, the CIWMB directed Cove Contractors to address these issues in a Corrective Action Plan, including the recommendation for the installation of new perimeter gas probes outside the landfill footprint and an increased monitoring frequency. The conceptual approach to completion of the Corrective Action Plan was discussed with representatives of the CIWMB at a meeting held on April 24, 2008 in the RWQCB offices in Rancho Cordova, California. During this meeting, it was agreed that the initial stages of verification would include installation of two new gas probes and monitoring of these probes to 2 M/LLER BAMUKN Aw, P:\707 Cove Contractors\Feasibility Study and Corrective Action Plan\Corrective Action Plan-Final.doc