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FORWARD LANDFILL <br /> NON-WATER CORRECTIVE ACTION PLAN <br /> ® 3.4 ENVIRONMENTAL CONTROL SYSTEMS <br /> Aside from the current and proposed liner and final cover systems, the environmental control <br /> systems at the Forward Landfill include a landfill gas extraction and destruction system with <br /> landfill gas condensate extraction and management and a groundwater extraction and treatment <br /> system. <br /> 3.4.1 Landfill Gas Extraction System <br /> The landfill gas extraction systems at Forward Landfill consist of series of collection wells <br /> interconnected by above-ground laterals and a main header pipe connected to a flare station and <br /> electric generation plant. <br /> There are two discrete, active landfill gas extraction systems at Forward. One system consists of <br /> 18 wells and provides control for parts of the northern portion of the site (the former Austin <br /> Road Sanitary Landfill). Landfill gas from this 18-well system is conveyed to the electric <br /> generation plant located at the northwest corner of the site. A third party landfill gas developer, <br /> Covanta, currently operates the landfill gas-to-energy plant, along with the field of 18 extraction <br /> wells. Currently, this system produces up to 760 kilowatts per hour of electrical power that is <br /> sold to Pacific Gas and Electric Company(PG&E)under a long-term agreement. Additional gas <br /> extracted from the landfill is destroyed at the flare station in the northeast portion of the landfill. <br /> The second landfill gas extraction system encompasses the majority of the Forward Landfill, and <br /> consists primarily of 216 vertical gas wells. Landfill gas is collected through a perimeter 18-inch <br /> gas collection header and is destroyed at the flare station located at the northeast corner of the <br /> site. The flare station consists of two enclosed ground flares located at the northeast corner of <br /> the landfill, with a combined capacity of 5,400 cubic feet per minute (cfm). <br /> 3.4.2 Groundwater Corrective Action System <br /> A groundwater extraction and treatment system has been constructed to intercept and remove <br /> VOC-impacted groundwater along the northern edge of the Austin unit. The system includes <br /> four extractions wells—EW-1, EW-2, EW-3, and EW-4—that pump groundwater to an air <br /> stripping unit to remove VOCs. The treated groundwater is then discharged to an infiltration <br /> pond. The groundwater corrective action system currently treats approximately 150 gallons per <br /> minute, or about 216,000 gallons of water per day. <br /> M:\2011-012MWFA REPORT.DOCX 8 Geo-Logic Associates <br />