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WASTE DISCHARGE REQUIREMENTS -14- FORWARD 14FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY WMU CLOSURE SPECIFICATIONS Landfill Closure 35. At closure,each landfill unit shall receive a final cover consisting, at a minimum,of a two-foot thick foundation layer which may contain waste materials, overlain by a one-foot thick clay liner, and finally by a one-foot thick vegetative soil layer, or an engineered equivalent final cover approved by the Board pursuant to Subsections 2510(b) and (c) of Chapter 15. 36. Vegetation shall be planted and maintained over each closed landfill unit. Vegetation shall be selected to require a minimum of irrigation and maintenance and shall have a rooting depth not in excess of the vegetative layer thickness. 37. Closed landfill units shall be graded to at least a three percent grade and maintained to prevent ponding. 38. The final cover for WMU A shall consist, at a minimum, of a two-foot thick foundation which may contain waste materials,overlain by a two-foot thick compacted clay layer,and finally a vegetative soil layer not less than 18 inches in thickness.A culvert drainage system shall be installed around WMU A to collect runoff from the vegetative layer and route the water into a holding pond. Surface Impoundment Closure 39. At closure of surface impoundments, all residual wastes, including liquids, sludges, precipitates, settled solids,and liner materials and adjacent natural geologic materials contaminated by wastes, shall be completely removed and discharged to a WMU approved by the Board. If after reason- able attempts to remove contaminated natural geologic materials,the Discharger demonstrates that removal of all remaining contamination is infeasible,the impoundment shall be closed as a landfill pursuant to Specifications 35 through 37 above. 40. If 1) residual wastes are classified as nonhazardous pursuant to Title 22,CCR,Division 4.5, Chapter 11; 2)containment features of the impoundment meet Class H landfill construction standards and performance goals as defined by Chapter 15; 3) all liquid waste are removed or treated to eliminate free liquids, and 4) residual moisture does not exceed the moisture-holding capacity of residual wastes(even under closure conditions), a surface impoundment may be closed as a landfill pursuant to Specifications 35 through 37 after compaction of the residual wastes. Land Treatment Unit Closure 41. During the closure and post-closure period, the Discharger shall continue all operations necessary to maximize degradation,transformation, or immobilization of waste constituents within the treatment zone,continue monitoring in compliance with this Order and Article 5 of Chapter I5, maintain precipitation and drainage control systems, and prevent runoff of waste constituents.