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CLEANUP AND ABATEMENT ORDER NO. R5-2006-0707 3 COVE CONTRACTORS, INC. AND EL DORADO PROPERTY MANAGEMENT, INC. COVE CONTRACTORS FACILITY SAN JOAQUIN COUNTY 10. On 26 October 2005, in response to the CWC Section 13267 Order, the Discharger submitted a Groundwater Investigation Workplan. On 2 December 2005, Regional Board staff concurred with the proposed plan. The Discharger has proposed to perform at least two quarterly sampling events. 11. On 1 November 2005, in response to the CWC Section 13267 Order, the Discharger submitted a Landfill Closure and Post -Closure Maintenance Plan. On 17 January 2006, the Discharger submitted a Revised Closure and Post -Closure Maintenance Plan. 12. The Discharger has proposed to install a Title 27 prescriptive cover at the facility. The cover will include at least a two -foot foundation layer, overlain by at least a one -foot low hydraulic conductivity layer (not to exceed 1x10-6 cm/s) and at least a one -foot vegetation layer. The Discharger requested a reduction in grade from the required three percent to one percent. To mitigate the reduction, the Discharger shall install at least one settling monument per acre. 13. Elevated levels of methane in the interior gas probes have been detected at the site. This Order requires the Discharger to perform at least two quarterly gas sampling events for VOCs using the USEPA Method TO -15. 14. This Order requires the Discharger to perform at least two quarterly groundwater monitoring events. Attachment B lists the constituents of concern and analyses required. 15. This Order requires the submittal of the results of the groundwater and gas monitoring and a report including a feasibility study and proposed corrective action measures for the cleanup of groundwater pursuant to Title 27 Section 20430. R- ' 1 16. By failing to close the Cove Contractors landfill in a timely manner, the Discharger has delayed corrective actions designed to remediate VOC, metal and inorganic releases and thus has caused or permitted, or threatens to cause or permit, waste to be discharged in such a manner that it threatens to create a condition of pollution or nuisance. 17. The Regional Board's Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, (Fourth Edition), 1998 (Basin Plan) establishes beneficial uses of the waters of the state and water quality objectives to protect those uses. 18. The beneficial uses of underlying groundwater, as stated in the Basin Plan, are municipal and domestic water supply, agricultural supply, and industrial service and process supply. 19. Title 27, Section 20080(d) states: "Units which were operating, or had received all permits necessary for construction and operation, on or before November 27, 1984, are designated as "existing" Units. This includes disposal sites classified under previous regulations and