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WASTE DISCHARGE REQUIREMENTS -12- FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY 19. If located in a 100-year floodplain. landfill units shall not restrict the flow of the 100-year flood, reduce the temporary water storage capacity of the floodplain, or result in washout of solid waste so as to pose a hazard to human health and the environment. Units which cannot comply with 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. 1mrbate generation by a landfill unit LCRS shall not exceed 85% of the design capacity of the pump.swap If leachate generation exceeds this value or if the depth of fluid in an LCRS exceeds ft minimum needed for pump operations then the Discharger shall immediate]y cease the Ascharge of sludges and other high-moisture wastes to the landfill unit and shall notify the Board in-w ting within seven days. Notification shall include a timetable for corrective action necessary to reduce leachate production. SURFACE IMPOUNDMENT SPECIFICATIONS 23. Design and consuuction plans and specifications shall be submitted to the Board for approval befbre co on of any surface impoundment. After surface impoundment construction, a construction quality assurance report shall be submitted to the Board and approved by Board staff 1pnor 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 nalffy 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,maybe 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 subaiked,.tothe=Executive Officer for approval before construction of any land treatment unit.