Laserfiche WebLink
• control device for the removal of HAPS prior to discharge into the atmosphere. <br /> 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 monitored 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, 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 combined landfill <br /> footprint. Should any of the existing probes (slated to remain inplace as part <br /> of the expansion) become damaged during expansion construction, they will <br /> be replaced with probes placed at a maximum depth equal to the depth of <br /> refuse. In addition, any probe found to be short of the refuse depth after <br /> expansion construction (due to lowered base grades at Austin Road - see <br /> Section 5.2.1) will be fitted with an additional probe at the refuse depth per <br /> 27 CCR, Section 20925(c)(1). New multi-depth perimeter probes will be <br /> installed to monitor and fulfill regulatory standards for subsurface migration, as <br /> required by the applicable local, state, and federal regulations (i.e., Article 6 of <br /> Title 27 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 /> • <br /> Forward Landfill JTD 7-12 <br /> L:\Allied\2000.193\Reports\jtd:5ec-7.0:05/24/02 <br /> BRYAN A.STIRgAT Sa ASSOCIATES <br />