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WASTE DISCHARGE REQUIREMENTS -6- FRENCH CAMP LANDFILL CITY OF STOCKTON SAN JOAQUIN COUNTY 5. Neither the treatment nor the discharge of wastes shall cause a pollution or nuisance as defined by the California Water Code, Section 13050. 6. The discharge of wastes shall not cause degradation of any water supply. C. Facilily Specifications: 1. All containment structures shall be designed and constructed under the direct supervision of a California registered civil engineer or a certified engineering geologist and shall be certified by that individual as meeting the prescriptive standards and performance goals of Chapter 15 prior to waste discharge. 2. Each new landfill module shall have a clay liner with a minimum thickness of 24 inches of compacted clay with a maximum hydraulic conductivity of 1 x 10-' cm/s, overlain by a 60 mil HDPE synthetic liner which is overlain by a dendritic LCRS. Landfill caps shall contain a clay layer with a maximum hydraulic conductivity of 1 x 10'' cm/s and a minimum relative compaction of 90 percent. HDPE liner materials shall be laboratory tested to determine their compatibility with solution with similar properties to landfill leachate. Hydraulic conductivities of the cap clay layer shall be determined by laboratory tests using water. Hydraulic conductivities determined through laboratory methods shall be confirmed by field permeability testing of either the finished clay layer or a test pad constructed of the same materials to be used in the clay layer. Construction methods and quality assurance procedures shall be sufficient to insure that all parts of the liner and cap meet the hydraulic conductivity and compaction requirements. 3. LCRSs shall be designed, constructed and maintained to collect twice the anticipated daily volume of leachate generated by the landfill and to prevent the buildup of hydraulic head on the underlying natural geologic materials of low hydraulic conductivity. The depth of fluid in any LCRS sump shall be kept at or below the minimum needed to ensure efficient pump operation. 4. Leachate generation by a landfill unit LCRS shall not exceed 85% of the design capacity of the LCRS or the sump pump. If leachate generation exceeds this value and/or if the depth of fluid in an LCRS exceeds the minimum needed for safe pump operation, then the Discharger shall immediately cease the discharge of sludges and other high-moisture wastes to the landfill module and shall notify the Board in writing within seven days. Notification shall include a time table for corrective action necessary to reduce leachate production.