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J WASTE DISCHARGE REQUIREMENTS -12- FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY this requirement shall close by 9 October 1996,unless otherwise extended by the Board. (40 CFR 258.16) 20. Dewatered sewage or water treatment sludge may be accepted for disposal if the sludge contains at least 20 percent solids (primary sludge) or 15 percent solids(secondary sludge), is mixed with refuse at a minimum solids-to-liquid ratio of 5:1 by weight and shall not exceed the initial moisture holding capacity of the solid waste. 21. Dewatered sewage or water treatment sludges shall only be landfilled in units D and H equipped with composite liners. 22. Leachate generation by a landfill unit LCRS shall not exceed 85% of the design capacity of the sump pump. If leachate generation exceeds this value or if the depth of fluid in an LCRS exceeds the minimum needed for pump operations then the Discharger shall immediately cease the discharge of sludges and other high-moisture wastes to the landfill unit and shall notify the Board in writing within seven days. Notification shall include a timetable for corrective action necessary to reduce leachate production. SURFACE IMPOUNDMENT SPECIFICATIONS 23. Design and construction plans and specifications shall be submitted to the Board for approval before construction of any surface impoundment. After surface impoundment construction, a construction quality assurance report shall be submitted to the Board and approved by Board staff prior to operation of the surface impoundment. 24. Leachate generation by a surface impoundment LCRS shall not exceed 85% of the design capacity of the sump pump. If leachate generation exceeds this value 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 waste,excluding leachate,to the impoundment and shall notify the Board in writing within seven days. Notification shall include a timetable for remedial action to repair the upper liner of the impoundment or other action necessary to reduce leachate production. LAND TREATMENT UNIT SPECIFICATIONS 25. WMU G, a land treatment unit,may be sited at any point in the area described in Attachment B. WMU G may not overlay any existing elements of a WMU. Design and construction plans shall be submitted to the Executive Officer for approval before construction of any land treatment unit. 26. As site conditions change,WMU G may be shifted to another point in the area described in Attachment B. The new location must be approved by Board staff.