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CLEANUP AND ABATEMENT ORDER NO. R5-2006-0707 6 COVE CONTRACTORS, INC. AND EL DORADO PROPERTY MANAGEMENT, INC. COVE CONTRACTORS FACILITY SAN JOAQUIN COUNTY 3. By 1 June 2006, the Discharger shall submit a slope stability analysis for the final proposed cover. The stability analysis shall be in accordance with Title 27 Section 21090(6). 4. By 1 June 2006, the Discharger shall submit a Groundwater Monitoring Well Installation Workplan to replace monitoring wells MW -9 and MW -10. The workplan shall be consistent with, and include the items listed in, the first section of Attachment B, which is attached hereto and made part of this Order by reference. In addition, the workplan shall address the abandonment of MW -9 and MW -10. 5. By 1 July 2006, the Discharger shall provide evidence that they have obtained an irrevocable fund (or provide other means) for closure and post -closure maintenance of the landfill in accordance with an approved closure and post -closure maintenance plan per Title 27 Section 20950. 6. By 1 July 2006, the Discharger shall provide evidence that they have obtained an approved amount of assurances of financial responsibility for initiating and completing corrective action for all known or reasonably foreseeable releases from the landfill in accordance with Title 27 Section 20380. 7. By 1 August 2006, the Discharger shall submit the results of the two quarterly groundwater and gas probe sampling events as proposed in the Groundwater Investigation Workplan submitted by the Discharger in October 2005 and Revised Closure Plan submitted in January 2006. All site monitoring wells shall be analyzed for the constituents listed in Attachment C. This report shall include an evaluation of the nature and extent of the groundwater and vadose zone plumes and a determination of whether the monitoring system meets the requirements of Title 27 Section 20415(b)(1)(C). The report shall also propose additional monitoring locations to comply with Title 27 Section 20415(b)(1)(C). 8. By l August 2006, the Discharger shall submit an engineering feasibility study for a corrective action program that addresses the results of the groundwater and gas monitoring. The corrective action program shall meet the requirements of Title 27 Section 20430. 9. By 1 August 2006, the Discharger shall submit a Monitoring Well Abandonment and Installation Report that describes the abandonment of MW -9 and MW -10 and installation of replacement groundwater monitoring wells. This report shall contain the items found in the second and third sections of Attachment A. 10. By 31 December 2006, the Discharger shall submit a report certifying that it has completed closure construction. 11. By 28 February 2007, the Discharger shall submit a final closure CQA report in accordance with Title 27 Sections 20323 and 20324.