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WASTE DISCHARGE REQUIREMENTS -7- SOUTHWEST HIDE COMPANY SURFACE IMPOUNDMENT CLOSURE SAN JOAQUIN COUNTY WNU CLOSURE SPECIFICATIONS 29. The closure of each WMU shall be under the direct supervision of a California registered civil engineer or certified engineering geologist. 30. Closed WMUs shall be provided with at least two permanent monuments, installed by a licensed land surveyor, from which the location and elevation of all wastes, containment structures, and monitoring facilities can be determined throughout the post-closure maintenance period. Landfill Closure 31 . At closure, each landfill unit shall receive a final cover which is designed and constructed to function with minimum maintenance and consists, 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. 32. 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. 33. Closed landfill units shall be graded to at least a three percent grade and maintained to prevent ponding. 34. Areas with slopes greater than ten percent, surface drainage courses, and areas subject to erosion by wind or water shall be designed and constructed to prevent such erosion. Surface Impoundment Closure 35. 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 an appropriate waste management unit. If after reasonable 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 B.31 through B.34 above.