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WASTE DISCHARGE REQUIREMENTS -2- FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY Class I for the purpose of closure and postclosure maintenance in Order No. 89-148. The cover consists of a foundation layer, a 24—inch, lxl0-6cm/sec compacted clay layer, an 18—inch vegetative drainage layer, and a culvert drainage system. A Final Hazardous Waste Facility Post-Closure Permit Modification No. 2 was issued by the Department of Toxic Substances (DTSC) on 7 June 1995 to update, modify and reformat the Hazardous Waste Facility Post-Closure Permit. The permit authorizes the Discharger to conduct post-closure maintenance, ground water monitoring, and corrective action for ground water contamination with respect to WMU A. 5. The discharger proposed the operation of a composting facility in a Report of Waste Discharge dated 26 April 1996. Waste Discharge Requirements for the composting facility were waived, in accordance with Resolution No. 96-031, Conditional Waiver of Waste Discharge Requirements for Composting Operations, and with the conditions that the facility will be built and operated as described in the 26 April 1996 Report of Waste Discharge. 6. The discharge proposes an alternative to the prescriptive liner requirements of Chapter 15. The alternative design substitutes a Geosynthetic Clay Liner(GCL)for the prescriptive 2-foot thick compacted clay component of the liner system. The Discharger also demonstrated that the design was in accordance with the Subsections 2510(b) and (c) of Article 1. Subsections 2510(b) and (c) describe the Board's authority to consider alternatives to construction or prescriptive standards. The Discharger demonstrated that the engineered alternative is feasible and consistent with the performance goal and affords equivalent protection against water quality impairment. 7. In the Spring of 1994, the Discharger constructed a temporary Soil Remediation Pad (SRP), consisting of one-foot of compacted clay, which was used to bioremediate petroleum(diesel and oil) contaminated soil from late May through September 1994 and 1995. In September of those years, all of the soil undergoing treatment and about 3-4 inches of the compacted clay liner were removed from the SRP and placed in the WMUs. The SRP was scheduled to be closed, however, the Discharger is now proposing to reuse, not close the SRP. Petroleum contaminated soils currently stockpiled in WMU G at the landfill will be treated on the SRP in future years. The Discharger proposes to continue using this SRP. The SRP is only operated in the dry months during fair weather and is not currently encroaching on any operational WMLJs. 8. Waste management units at Forward are described in the following table. The acreage shown (213 acres) is greater than the size of the property (157 acres) because some units overlap.