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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -7- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY natural geologic materials underlying the unit were sufficiently protective of underlying groundwater beneficial uses to meet Class III unit containment standards in Title 27, sections 20240 and 20260. Monitoring data have since indicated, however, that waste constituents from LF-1 have migrated into the unsaturated zone and groundwater, indicating that the natural geologic materials underlying the site do not meet Class III containment standards.1 Instead of declassifying or reclassifying LF-1, these WDRs require that LF-1 be closed given that it can no longer accept wastes because it does not meet Class III containment standards. See Findings 30 and 136; Closure and Postclosure Specification E.2. 30. A landfill’s containment system includes its base liner, and, after closure, its final cover. Given that LF-1 was constructed and subsequently developed without a base liner prior to the enactment of Chapter 15 regulations in 1984, retrofitting the unit with a Class III level base liner is infeasible. These WDRs therefore require that the Discharger complete closure of LF-1 in accordance with Title 27 performance standards (i.e., to provide the unit with that portion of a Class III level containment system that is feasible to construct on the top deck and side slopes). See Title 27, section 20950(a)(2)(A)(1). 31. Given that these WDRs classify LF-1 and LF-2 as separate landfill units (see Finding 27), the Closure and Postclosure Specifications of this Order require that the Discharger submit separate closure plans for each unit. A revised Partial Final Closure and Postclosure Maintenance Plan (Partial FCP/PCMP) is required for LF-1 to complete closure of that unit and a revised Preliminary Closure and Postclosure Maintenance Plan (PC/PCMP) is required for LF-2. 32. The proposed Class II surface impoundment (see Finding 9) is regulated under authority given in Water Code section 13000 et seq. and Title 27 section 20005 et seq. 33. Water Code section 13173 defines “designated waste” as either of the following: a. Hazardous waste that has been granted a variance from hazardous waste management requirements pursuant to Health and Safety Code section 25143. b. Nonhazardous waste that consists of, or contains, pollutants that, under ambient environmental conditions at a WMU, could be released in concentrations exceeding applicable WQOs or that could reasonably be expected to affect beneficial uses of the waters of the state as contained in the appropriate state water quality control plan. The Discharger proposes to discharge certain designated wastes—specifically, landfill leachate and other wastes—to a proposed Class II surface impoundment at the Facility. This Order authorizes the discharge of such wastes to the WMUs specified in Section B.9. 1. Previous WDRs Order R5-2003-0020 (Finding 15), for example, stated, in part, “The site characteristics where the Unit is located . . . are not suitable for a new Class III landfill contained in §20260(a) and (b)(1) of Title 27 without the construction of additional waste containment features in accordance with §20260(b)(2) of Title 27 and State Water Resources Control Board Resolution No. 93-62”.