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As previously discussed in Section 5.2.7, the currently active LFGES installed on a <br /> portion of the existing Austin Road Landfill will be expanded for the future fill <br /> operations at the Forward Landfill (see Drawing 13). The proposed LFGES <br /> includes horizontal and vertical extraction wells to comply with regulatory <br /> standards. As the landfill expands, it is anticipated that most of the LFGES will be <br /> installed, with the balance of the system completed as part of closure. <br /> 7.5.2 PERIMETER GAS MONITORING <br /> The effectiveness of the LFGES will be rxionitored.through'.a.system of gas <br /> migration probes. The current gas migration monitoring system at the Austin <br /> Road Landfill consists of 12 perimeter gas.monitoring probes as,shown:on <br /> Drawing 12. The Forward Landfill gas migration control monitoring system <br /> consists of 10 perimeter gas monitoring probes. For the combined landfill, <br /> probes SGP-2A, SGP-313, SGP-4A, GP-9, and GP-10 must be abandoned to <br /> accommodate the expansion between the two landfills. Drawing 13 presents <br /> the locations of the perimeter gas monitoring probes for the°combinediandfill <br /> footprint. New multi-depth perimeter probes, if required, will be installed to <br /> monitor and fulfill regulatory standards for subsurface migration, as required <br /> by the applicable local, state, and federal regulations (i.e,, Article 6 of Title 27 <br /> CCR). <br /> The probes will be monitored in accordance with the schedule presented in <br /> Section 7.5.4 to determine if the LFG is migrating laterally through the soil away <br /> from the landfill. When compliance levels are exceeded in any probe, <br /> adjustments to the LFGES will be initiated and/ or additional extraction wells will <br /> be installed where migrating gas is detected, if required. <br /> 7.5.3 GAS CONDENSATE COLLECTION SYSTEM <br /> As landfill gas cools within LFGES piping, condensate is formed. Condensate <br /> generation is dependent upon gas flow and variations in ambient temperatures. <br /> Along with the LFGES, a condensate management system will be designed to <br /> handle condensate that collects in the low points of the LFGES piping. Sump <br /> pump stations will be utilized to transfer condensate from these low points to a <br /> holding tank located at the flare station. The holding tank(s) can be emptied <br /> Forward Landfill jTD 7-12 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-7.0:08/20/01 BRYAN A.STIRRAT S ASSOCIATES <br />