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Draft Environmental Impact Report Page III-26 - Forward Inc. Landfill Expansion I The typical design for a solidification basin is a below-grade reinforced concrete structure placed outside the refuse fill area. The facility typically consists of two side-by-side chambers approximately 30 feet by 20 feet,with a depth of ten to 16 feet. The thickness of the basin structure would be designed to support the weight of the mixing equipment. The basin would include , concrete aprons and water stops(curbs)to prevent spillage outside the facility. The apron would ��` be graded to drain towards the basin so that liquids(precipitation or spillage of liquids)falling on ; the apron would flow into the basin. Gravel-surfaced drive areas would be placed around the aprons to facilitate traffic and safety in all weather conditions. Handrails and curbs would be placed on all sides of the basin. Escape ladders and flotation rings would be provided on each chamber. The solidification area would be fenced for security and safety purposes. Earthen berms would be set around the facility to divert surface water run-on. A detection/collection system-and liner may also be utilized beneath the basin. Subject to regulatory approval,the waste solidification operation would relocated as needed to accommodate development of landfill disposal areas. Changes to Quantification of Beneficial Reuse Materials Materials Delivered to MRF and Limited Reuse Soil The Forward Landfill accepts materials for beneficial uses such as Alternative Daily Cover(ADC), wet weather deck preparation, internal haul road improvements,and earthen drainage control improvements. These materials include green waste, ash and cement kiln dust, treated automobile shredder waste,shredded tires and"beneficial use" inert materials other than soil(concrete, asphalt,roofing tile, other rock/aggregate-based materials,etc.). Soils not requiring disposal and which are utilized for beneficial reuse are classified prior to use at the landfill. Limited reuse soils are both(1) "contaminated soils" which do not meet LEA requirements,and(2)Class II waste (or designated wastes)based on criteria established by the RWQCB. Limited reuse soils can only be used within a lined Class II landfill cell. Incoming limited reuse soil quantities would be recorded and the amount received(in tons)would be counted against the maximum permitted tonnage(8,668 tpd). The landfill averages approximately 750 tons per day (tpd)of limited reuse soil with occasional peaks of 3,200 tpd. The MRF located in the southeast corner of the site is governed by a separate Solid Waste Facility Permit(SWFP) from the landfill operation at the site. The MRF's SWFP effectively limits material Wever that tonnage is currently counted as part of the landfill's tpd;ho Y o the MRF to 500 , g livered t de P separately from the landfill limit. Forward Landfill proposes to count MRF tonnage sep y daily tonnage P P tonnage,leaving the individual facility limits in place. The maximum inflow rate to the MRF would remain 500 tpd. The maximum inflow rate to the landfill would remain 8,668 tpd,but would apply only to waste disposed. In addition to the 8,668 tpd of waste,500 tpd of material delivered to the MRF, and 40,000 gallons of high moisture content waste (as discussed in Solidification of High Moisture Content Wastes, above),Forward proposes to accept a maximum of 5,487 tpd of beneficial reuse materials. It is unlikely that the maximum permitted quantity of all these materials(8,668 tpd disposal, 5,487 tpd beneficial reuse materials,500 tpd to the MRF,and 40,000 gpd of sludge and liquid wastes)would be accepted on any given day due to the vehicle count limitations. i.�i