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WASTE DISCHARGE REQUIREMENTS -13- <br />FORWARD INCORPORATED <br />WASTE MANAGEMENT FACILITY <br />CLASS II LANDFILLS CLASS III LANDFILLS <br />CLASS II SURFACE IMPOUNDMENT <br />CLASS II LAND TREATMENT UNIT <br />CLOSURE OF CLASS I LANDFILL <br />SAN JOAQUIN COUNTY <br />11. Materials used to construct the LCRSs shall have appropriate physical <br />and chemical properties to ensure the required transmission of <br />leachate over the life of the WMUs. <br />12. Clay liners and landfill caps shall have a minimum hydraulic <br />conductivity of 1x1O-6 cm/s and a minimum relative compaction of 90 <br />percent. Hydraulic conductivities of liner materials shall be <br />determined by laboratory tests using solutions with similar <br />properties as the fluids that will be contained. Hydraulic <br />conductivities of cap materials shall be determined by laboratory <br />tests using water. <br />Hydraulic conductivities determined through laboratory methods shall <br />be confirmed by field testing of the finished liner. Construction <br />methods and quality assurance procedures shall be sufficient to <br />ensure that all parts of the liner and cap meet the hydraulic <br />conductivity and compaction requirements. <br />13. LCRS shall be designed, constructed, and maintained to collect twice <br />the anticipated daily volume of leachate generated by the WMU and <br />to prevent the buildup of hydraulic head on the underlying liner at <br />any time. The depth of fluid in any LCRS sump shall be maintained <br />low enough to prevent a significant head on the liner. <br />14. All containment structures shall be designed and constructed under <br />the direct supervision of a California registered civil engineer or <br />a certified engineering geologist and shall be certified by that <br />individual as meeting the prescriptive standards and performance <br />goals of Subchapter 15 prior to waste discharge. <br />15. The concentrations of indicator parameters or waste constituents in <br />waters passing through the Points of Compliance shall not exceed the <br />"water quality protection standards" established pursuant to <br />Monitoring and Reporting Program No. which is attached to <br />these waste discharge requirements. <br />