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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2014-0006 -7- FORWARD INC.AND REPUBLIC SERVICES INC. FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY 21.Title 27, section 20690 allows the use of alternative daily cover (ADC) at MSW landfills upon approval by the Local Enforcement Agency (LEA) and concurrence from CalRecycle. Title 27, section 20705 provides the Water Board's regulations for all daily and intermediate cover including that it shall minimize the percolation of liquids through waste and that the cover shall consist of materials that meet the landfill unit classification (Class II or Class III). The regulations also require that for non-composite lined portions of the landfill, that any contaminants in the daily or intermediate cover are mobilized only at concentrations that would not adversely affect beneficial uses of waters of the state in the event of a release. For composite-lined portions of the landfill, the regulations require that constituents and breakdown products in the cover material are listed in the water quality protection standard. 22.The Discharger uses the following materials for ADC: synthetic fabric tarps; processed green material; shredded tires; ash and cement kiln dust; construction and demolition wastes; contaminated soils; compostable materials (off-spec, delivered by generator); and processed and treated auto shredder residue. ADC materials were previously approved by the LEA. The Discharger has demonstrated that these materials meet the unit classification where they will be discharged, and that the constituents and breakdown products are included in the water quality protection standard. Materials approved for wet season use have been demonstrated to minimize percolation of liquids through waste. 23.Landfills may propose new ADC materials 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 staff provided the Discharger has demonstrated it meets the requirements in Title 27, section 20705. The approved ADC materials should then be listed in the facility's WDRs during the next regular update or revision with information about the Discharger's demonstration. This Order also includes a requirement that ADC only be used in internal areas of the landfill unless the Discharger demonstrates that runoff from the particular ADC is not a threat to surface water quality. The demonstration can take sedimentation basins into account. 24.The Discharger proposes to discharge leachate and landfill gas condensate to the composite-lined landfill units which are similar in classification and characteristics to those units from which leachate was extracted. 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. Leachate can be discharged to a different unit only if: a. the receiving unit has an LCRS, contains wastes which are similar in classification and characteristics to those in the unit(s) from which the leachate was extracted, and has at least the same classification as the unit from which leachate was extracted; b. the discharge to a different unit is approved by the Central Valley Water Board; and