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WASTE DISCHARGE REQUIREMENTS -5- SOUTHWEST HIDE COMPANY SURFACE IMPOUNDMENT CLOSURE SAN JOAQUIN COUNTY 7. Materials used to construct leachate collection and removal systems (LCRSs) shall have appropriate physical and chemical properties to ensure the required transmission of leachate over the life of the WMUs and the post-closure maintenance period. 8. Clay liners and landfill caps shall have a maximum hydraulic conductivity of 1 x 10-6 cm/s and a minimum relative compaction of 90 percent. Hydraulic conductivities of liner materials shall be determined by laboratory tests using solutions with similar properties as the fluids that will be contained. Hydraulic conductivities of cap materials shall be determined by laboratory tests using water. Hydraulic conductivities determined through laboratory methods shall be confirmed by field testing of the finished liner or test pad as approved by Board staff. 9. LCRSs shall be designed, constructed, and maintained to collect twice the anticipated daily volume of leachate generated by the WMU and to prevent the buildup of hydraulic head on the underlying liner or underlying natural geologic materials of low hydraulic conductivity at any time. The depth of fluid in any LCRS sump shall be kept at the minimum needed for safe pump operation. 10. All WMUs shall be designed and constructed in accordance with Chapter 15 and this Order and approved by Board staff prior to construction and again prior to operation. The design plans submitted to the Board for review and approval prior to construction shall include, but not be limited to, the final engineered design plans for the WMU, the construction specifications, a construction quality assurance (CQA) plan, and a revised water quality monitoring plan. The final construction report shall include, but not be limited to, construction record drawings for the WMU, a CQA report with a written summary of the CQA program and all test results and analyses, and a certification as described in Specification 12. The final construction report shall be submitted within 60 days of construction completion. 11 . Construction methods and quality assurance procedures shall be sufficient to ensure that all parts of the liner and cap meet the hydraulic conductivity, moisture content, and compaction requirements. Proposed design parameters (e.g. , soil type, Atterburg limits, moisture content, relative compaction) , construction methods, and quality assurance procedures for clay liners shall be utilized in the construction of a test pad prior to liner construction to ensure adequacy of the design, construction, and testing methods.