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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -19- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY LANDFILL OPERATIONS 78. Waste disposal is conducted by the area-ramp method. Filling of a new module generally begins along the side adjacent to the previous module. Refuse is placed in 6 to 10 foot lifts and spread and compacted on a sloped working face (about 100’ x 90’) until the lift is about two feet thick. The waste is inspected for unauthorized or hazardous wastes as it is spread. Diversionary berms are constructed in the wet season to divert storm water away from the working face. During the wet season, cover soil is stockpiled near the working face. 79. Cover soil for landfill operations is obtained from the long term borrow area west of Module 1 or from module construction areas. A refuse to soil ratio of approximately 4:1 is maintained for daily cover, which is applied at the working face in 6-inch minimum lifts. Tarps are employed as alternative daily cover (ADC). Intermediate cover soil of 12-inches minimum thickness is placed in areas that will be inactive for at least 180 days per Title 27, CCR Section 20705. 80. Landfills propose new ADC materials regularly in order to preserve landfill air space and to beneficially reuse waste materials. Title 27, section 20686 includes regulations for beneficial reuse, including use of ADC. Approval of ADC is primarily handled by the LEA and CalRecycle under Title 27, section 20690. This Order allows any ADC proposed for use at the facility after the adoption of this Order to be approved by Central Valley Water Board’ Executive Officer provided the Discharger has demonstrated it meets the requirements in Title 27, section 20705. See Discharge Specification B.2. Leachate and Condensate Management 81. Leachate and condensate handling facilities at the site currently include Module 1’s LCRS sumps (primary and secondary) and associated controls; a 10,000 gallon leachate storage tank (near the LFG flare station); a leachate return line; condensate traps and return lines; and other related facilities. Similar leachate and condensate handling facilities will be installed at the site on an as-needed basis as future landfill modules (each with an LCRS and LCRS sump) are developed. See also Finding 130. 82. Title 27, section 20340(g) requires that leachate be returned to the unit from which it came or be discharged in a manner approved by the regional board. This section of Title 27 also references State Water Board Resolution 93-62 regarding liquids restrictions in 40 C.F.R. section 258.28 for MSW landfills. 40 C.F.R. section 258.28 states that liquid waste may not be placed in MSW landfill units unless the waste is leachate or gas condensate derived from the landfill unit and it is designed with a composite liner and an LCRS. Therefore, leachate and landfill gas condensate from composite lined units with an LCRS may be returned to the unit from which they came, but may not be discharged to another MSW landfill unit other than the proposed Class II surface impoundment. Similarly, landfill gas condensate obtained from an unlined unit may not be returned to that unit because it is not compositely- lined, and it may not be discharged to another MSW landfill unit because it did not originate from that unit.