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WASTE DISCHARGE REQUIREMENTS FOR -9- KEARNEY-KPF CLOSURE OF SURFACE IMPOUNDMENTS SAN JOAQUIN COUNTY 2. All wells shall have sanitary seals which meet the requirements of the Public Health Service of San Joaquin County, Environmental Health Department or shall be properly abandoned. A record of the sealing and/or abandonment of such wells shall be sent to the Board and to the State Department of Water Resources. 3. Water used for facility maintenance shall be limited to the minimum amount necessary for dust control , revegatation for closure and landscape irrigation. General WMU Construction 4. Materials used to construct liners shall have appropriate physical and chemical properties to ensure containment of discharged wastes over operating life, closure, and post-closure maintenance period of the WMUs. 5. Natural geologic materials used in place of a liner shall be confirmed as being a continuous layer immediately underlying the WMU having a minimum thickness of ten feet and a maximum hydraulic conductivity of 1 x 10-7 centimeters per second (cm/sec) . This shall be accomplished through a series of borings, performed by or under the supervision of a registered civil engineer or certified engineering geologist, to a depth of not less than ten feet below the WMU and on a horizontal spacing of not more than 200 feet on centers. These borings shall be sealed so as not to impair the integrity of this layer. The logs of these borings shall be completed by an experienced geologist and submitted to the Regional Board for review and approval prior to construction of the WMU. 6. 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. 7. Clay liners and landfill caps shall have a maximum hydraulic conductivity of 1x10'cm/sec 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 and/or cap. 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.