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f Draft Environmental Impact Report Forward Inc. Landfill Expansion Page III-27 Additional Electric; Generation With Landfill Gas 1 ,? As discussed in A. Background, above, a third party operates a landfill gas-to-energy plant in the norrth est portionao developer, he Forward dg ovanta, currently Landfill, along with a field of extraction wells in the former Austin Road Sanitary Landfill in the northern g portion of the site. As part of the proposedproject, additional electricitygeneration landfill gas is proposed, either as a retrofit and expansion of the existinlant ora newlt facility at a separate location. �: + If a new Iandfillas-to-en g ergy (LFGTE)facility is implemented, it would occupy approximately 0.3 to 0.5 acres in the northeastern corner of the site near the existing blower/flarestation where the landfill gas (LFG)is currentlydirected. The Initial facility would consume approximately Ft 1,650 standard cubic feet per minute (scfm) of LFG and would generate approximately 5 megawatts (MW) of power. The LFGTE facility would be expanded as additional LFG becomes + available. It is expected that at full capacity (around the time of site closure) the facility would I� produce approximately 20 MW of power. The initial facility likely would consist of either: ,a I. Three to five reciprocating engines in the range of 1.0 MW. Each engine would be about 20 feet in length and 8 feet in width with a stack height of 30 to 40 feet, depending on air permit requirements. The engines would be located inside a building (probably a rectangular flat roof metal building) along with controls and generators, with the stacks on top of the building;or 2. One 4.976-MW turbine, probably located in an enclosed container approximately 37 feet long by 10 feet wide with a stack height of 30 to 40 feet, depending on air permit requirements. Transmission lines may be required depending on whether the existing electrical lines are of appropriate standard to direct generated power. If new transmission lines are necessary, they - would be above ground lines suspended on new power poles. The alignment of the transmission lines and power poles would be dependent on the location of the near connection with a power line with an appropriate standard. est ' Lower the Base Level of the Northeast Area Y The base grades in the area east of WMU FU-06 of the currently permitted Forward Landfill were designed to drain to the area directly west of the current scale house. However,with the ; expansion of the disposal area on to the(permitted)northeast area of the site,the leachate risers of the Leachate Collection and Recovery System would not be easily accessible from this location. To .. provide a minimum grade on the east-west trending leachate pipes of one percent and to maintain stability of the refuse fill,the minimum base grades in the area at of WMU FU-06 are proposed to be lowered from the current restriction of seven feet AMSL (above mean sea level)in the Waste Discharge Requirements (WDRs)issued by the Central Valley Regional Water al; Cont rol Board (CVRWQCB). Because current groundwater levels are approximately 1 f et BMSL (below .-, mean sea level), the seven-foot AMSL WDR restriction results in an approximately 21-foot separation between waste and groundwater. The 21-foot separation between waste and 1 groundwater is substantially greater than the minimum five-foot separation required by Title 27, Section 20240(c). The proposed minimum elevation for waste discharge in the area east of WMU FU-06 is-one foot BMSL,which would allow a five-foot separation from historic high groundwater ! and an approximately 13-foot separation from current groundwater levels. This issue is discussed further in Section IV.F,Hydrology and Water Quality. a I i