ARCHIVED REPORTS_1989-2005 - Laserfiche WebLink

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n WASTE DISCHARGE REQUIREMENTS FORWARD INCORPORATED WASTE MANAGEMENT FACILITY CLASS II LANDFILLS CLASS III LANDFILLS CLASS II SURFACE IMPOUNDMENT CLASS II LAND TREATMENT UNIT CLOSURE OF CLASS I LANDFILL SAN JOAQUIN COUNTY -15- 19. Annually, prior to the anticipated rainy season, any necessary erosion control measures shall be implemented, and any necessary construction, maintenance, or repairs of precipitation and drainage control facilities shall be completed to prevent erosion or flooding of the site and to prevent surface drainage from contacting or percolating through wastes. 20. Water used for site maintenance shall be limited to the minimum amount necessary for dust control. 21. During the rainy season, when precipitation can be expected, a minimum one -foot thickness of low permeability cover shall be maintained over all but the active disposal area of the landfill units. The active disposal area shall be confined to the smallest area practicable based on the anticipated quantity of waste discharge and other disposal site operations. This cover may not be required at WMU E if the character of the ash is such that infiltration by rainwater is not a problem. 22. The migration of methane gas from the landfill units shall be controlled as necessary to prevent nuisance conditions or the impairment of beneficial uses of water. 23. 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 ultimate moisture holding capacity of the 'nonhazardous solid waste' and is not a 'designated waste'. 24. Each trench in WMU D and WMU H accepting dewatered sewage or water treatment sludges shall have a two -foot thick clay liner (10' cm/sec permeability) with a dendritic or blanket type LCRS immediately above the liner which is designed and operated to prevent the development of one -foot or more of hydraulic head on the lower liner at any time. 25. Any additional ash pits constructed in WMU E shall be built following the design and construction plans for the eastern -most pit.