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downdrains will reduce the length of travel of run-off on the slope face thus <br /> reducing the potential for erosion rills and gullies. <br /> The landfill surface will be vegetated with native grasses. The vegetation will <br /> protect the upper soil layer and minimize erosion through the vegetation root <br /> masses. <br /> 3.7 LEACHATE TREATMENT <br /> As discussed in Section 2.4, the majority of the existing WMUs at the Forward <br /> Landfill contain blanket LCRS systems. There is no LCRS on the base of the <br /> existing Austin Road Landfill. The expansion areas will have an LCRS. All LCRS <br /> improvements will be completed during site operations, no further <br /> improvements will be required at closure. <br /> 3.8 LANDFILL GAS CONTROL <br /> The purpose of the landfill gas recovery and monitoring system during closure <br /> and post-closure is to protect public health and the environment. The Forward <br /> Landfill gas control and monitoring system, will be installed and operated in <br /> accordance with 27 CCR, Section 20920. The proposed LFGES may be installed <br /> below or above grade. The vertical extraction wells and horizontal collectors <br /> will be connected to a looped LFGES that will be installed around the perimeter <br /> of the landfill. The LFGES may be independent of the existing system utilized by <br /> Ogden Pacific Power. Landfill gas not utilized by the power generation facility <br /> will be collected, conveyed and incinerated in an enclosed ground flare. The <br /> proposed flare station location is identified on Drawing 13 of the JTD. <br /> The looped gas header system will allow the operator to divert the landfill gas in <br /> the opposite direction when the gas extraction system requires upgrades, <br /> maintenance, or repairs by shutting isolation valves. Only a very small portion of <br /> the extraction system would be taken off-line while maintenance is being <br /> performed, minimizing the potential impact of surface emissions and subsurface <br /> landfill gas migration. Under normal operation, the looped header design will <br /> allow landfill gas to be routed through both of the extraction headers and <br /> significantly reducing the required line sizes. The proposed LFGES includes <br /> horizontal and vertical wells to comply with regulatory standards. <br /> Forward Landfill PCPCMP 3-11 <br /> L\Allied\2000.193\Reports\FinaIPCPCMP:FL-sec3:5/24/02 BRYAN A.STIRRAT&,ASSOCIATES <br />