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WASTE DISCHARGE REQUIREMENTS 8 J. R. SIMPLOT COMPANY LATHROP, SAN JOAQUIN COUNTY 17. Any direct-line discharge to a surface impoundment shall have fail-safe equipment or operating procedures to prevent overfilling. 18. The surface impoundments shall be designed,constructed, and maintained to prevent scouring and/or erosion of the liner(s) and other containment features at points of discharge to the impoundments and by wave action at the waterline. 19. Leachate generation from any WMU shall not exceed 85% of the LCRS design capacity or the sump pump's capacity, whichever is lower. If leachate generation exceeds this value and/or if the depth of fluid in an LCRS exceeds the minimum needed for safe pump operation, then the Discharger shall immediately cease the discharge of wastes to the WMU and shall notify the Board in writing within seven days. Notification shall include a time table for corrective action necessary to reduce leachate production. 20. . Liquids removed from a surface impoundment LCRS shall be discharged to the impoundment from which it originated. 21. Solids which accumulate in the surface impoundment(s) shall be periodically removed to maintain minimum freeboard requirements and to maintain sufficient capacity for surface impoundment leachate and for the discharge of wastes. Prior to removal of these solids, sufficient samples shall be taken for their characterization and classification pursuant to Article 2 of Chapter 15. The rationale for the sampling protocol used,the results of this sampling, and a rationale for classification of the solids shall be submitted to the Board for review. WMU CLOSURE SPECIFICATIONS 22. The closure of each WMU shall be under the direct supervision of a California registered civil engineer or certified engineering geologist. 23. 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. SURFACE IMPOUNDMENT CLOSURE 24. At closure of surface impoundments, all residual wastes, including liquids, sludge, 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 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 closure requirements of Chapter 15. 25. If 1)residual wastes are classified as non-hazardous pursuant to Title 22, CCR, Division 4, Chapter 30,2) containment features of the impoundment meet Class H landfill construction standards and performance goals as defined by Chapter 15, 3) all liquid wastes 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 closure requirements of Chapter 15 after compaction of the residual wastes.