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2.0 EXISTING ENVIRONMENTAL CONTROL AND MONITORING SYSTEMS 2.1 LANDFILL GAS CONTROL/MONITORING SYSTEM The Forward Landfill has two active landfill gas (LFG) extraction systems. The first system, installed at the former Austin Road Landfill, is utilized by Covanta Energy to operate an electrical generation plant located at the northwest corner of the site. The power plant utilizes enough LFG to produce up to 760 kilowatts per hour of electrical power. This energy is sold to Pacific Gas and Electric Company (PG&E) under a long-term agreement. The Covanta Energy System is comprised of approximately 30 vertical extraction wells, which actively collect gas from the waste prism, and headers and lateral piping to convey this extracted LFG to the generation facility. The second LFG extraction system encompasses the remainder of the site. This system consists of one hundred sixty-nine (169) vertical gas wells. LFG is collected through a perimeter 18-inch gas collection header with the LFG processed at the enclosed ground flare located in the northwest corner of the site. Figure 3 shows the current landfill gas control system. At a minimum, the system will incorporate the following equipment: • Enclosed ground flare facility and/or energy recovery facility • Vertical extraction wells • Horizontal gas collectors • Condensate management system components To date, approximately 3/4 of the perimeter header system loop has been completed around the site. The remainder of the loop will be completed as the landfill expands. The Forward Landfill has a landfill gas migration monitoring system consisting of perimeter gas monitoring probes. Probes SGP-7A, SGP-8A, SGP-9A, SGP-1013, SGP-14, and SGP-13 are located at the perimeter of the Stage IA closure area as shown on Drawing Sheet 2. Forward Landfill PFCPCMP 2-1 J:\Allied\forward\2005.0051 Partial Closure\Partial closure Plan\FL-sec2.doc:6/9/2005