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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 pr.oposed.L;FGES. ay be installed <br />below or above grade. The vertical extraction wells and horizontal collectors <br />will be connected to `a looped LFGESthat 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. Several <br />possible flare station locations are identified on Drawing 13 of the )TD. <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: 8/20/01 BRYAN A. STIRRAT S ASSOCIATES <br />