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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -53- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY 8. Closed or partially closed landfill unit side slopes shall be no steeper than 3H:1V, and closed top deck areas shall be sloped at three percent or greater. 9. The Discharger shall install and maintain an active landfill gas extraction system appropriately sized to remove LFG from the closed landfill unit throughout the postclosure period. Landfill gas shall be extracted from closed landfill units until such time that the landfill gas is no longer a threat to water quality as documented by the Discharger and approved by the Executive Officer. 10. For closure designs including geomembrane and/or GCL, the Discharger shall seal the edges of the final cover by connecting its components to the base liner, as necessary and feasible. 11. The Discharger shall test the critical interfaces of the final cover in a laboratory to ensure minimum design shear strengths are achieved and include the results in the final documentation report. 12. The Discharger shall ensure that the vegetative/erosion resistant layer receives necessary seed, binder, and nutrients to establish the vegetation proposed in the final closure plan. The Discharger shall install necessary erosion and sediment controls to prevent sediment in runoff from the closed landfill during the period the vegetation is being established. 13. The Discharger shall submit an updated Preliminary CPMP for Calaveras SI. See Provision H.9.i. 14. The Discharger shall comply with all Standard Closure and Post-Closure Specifications listed in Section G and all Standard Construction Specifications that are applicable to closure in Section F of the SPRRs dated January 2012 which are attached hereto and made part of this Order by reference. F. FINANCIAL ASSURANCE SPECIFICATIONS 1. The Discharger shall obtain and maintain assurances of financial responsibility with CalRecycle for closure and post-closure maintenance of LF-2 in at least the amounts in the most recently approved PC/PCMP, as adjusted for inflation annually. A report regarding financial assurances for closure and post-closure maintenance shall be submitted to the Central Valley Water Board by 1 June of each year. This may be the same report that is submitted to CalRecycle for this purpose. If CalRecycle determines that either the amount of coverage or the mechanism is inadequate, then within 90 days of notification, the Discharger shall submit an acceptable mechanism to CalRecycle and the Central Valley Water Board for at least the amount of the approved cost estimate. 2. The Discharger shall update the most recently approved PC/PCMP any time there is a change that will increase the amount of the closure and/or post- closure maintenance cost estimate. The updated PCPCMP shall be submitted to the Central Valley Water Board, the Local Enforcement Agency, and