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0 WASTE DISCHARGE REQUIREMENTS {. FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY 28. The active life of Forward landfill is estimated to be 13 years based on refuse capacity of 9.4 million cubic yards and a refuse till rate of 1,900 tons per day, 312 days per year and an in-place density of 1250 pounds per cubic yard. WMU D has an estimated refuse capacity of 10.1 million cubic yards and a service life of 11 years. WMU H will have a refuse capacity of 1.78 million cubic yards and an estimated service life of two years. The estimated service life of the units is based on disposal rates and will change if disposal rates are significantly different than predicted. 29. WMU E, the coal ash landfill unit, has a design capacity of 520,000 cubic yards. 30. Soil contaminated with less than hazardous levels of petroleum hydrocarbons will be treated at WMU G, a Class II land treatment unit, or discharged to a Class II landfill unit. Piles of contaminated soil awaiting treatment will also be stored in the area designated for this WMU.The Discharger has demonstrated that the soil contaminated with less than hazardous levels of petroleum hydrocarbons can be transformed to a `nonhazardous solid waste' within the treatment zone.WMU G may be moved to a new location on the facility as existing WMUs are expanded or as new WMUs are built. as shown on Attachment B. 31. The Discharger also uses four Class II waste piles constructed within the area specified for WMU G for the biotreatment of petroleum contaminated soils.These waste piles are designated here as WMUs G92-1,2,3 and 4.These double-lined treatment pads afford greater water quality protection against VOC migration than land treatment units without liners. The pads meet the design requirements for Class ll waste piles with a synthetic outer liner overlain by a blanket LCRS and an upper clay liner. Upper clay liners were used in the design to withstand the repeated operation of heavy equipment in the waste handling and biotreatment process.Water is applied to soils in the waste piles to optimize moisture conditions for biological degradation of organic contaminants. DESIGN OF WASTE MANAGEMENT UNITS Landfib 32. The containment features of existing landfill units are provided in Finding 5. Starting with WMU D- 93 and all future landfill units in WMU D and WMU H, the liner design is proposed to meet Class 11 landfill standards in Chapter 15.These landfill units will include a composite liner overlain by a blanket LCRS or engineered alternative liner design approved by the Board. The composite liner includes at least two feet of compacted soil with a permeability of 10-7 cm/s or less and a geosynthetic liner at least 40 mil in thickness (minimum 60 mil if HDPE).Future WMU D liners which overlie existing landfill units will include either a composite liner as described above or engineered alternative liner designed in compliance with Chapter 15. Impoundments 3 3. The liner in WMU F is currently a single clay liner that will be removed before leachate reaches the outer one foot of the liner. The design for future liner systems in WMU F will be submited prior m construction.