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checking program is designed to monitor that unacceptable wastes are not discharged to any treatment or disposal WMUs at the FL. 4.4 CURRENT ENVIRONMENTAL MONITORING AND CONTROL SYSTEMS The current environmental monitoring and control systems at the FL include the landfill gas monitoring and control systems, water quality monitoring system (i.e., groundwater, surface water, and NPDES stormwater), and leachate control and monitoring system and are discussed in the following sections. 4.4.1 LANDFILL GAS MONITORING AND CONTROL SYSTEMS The current landfill gas control system consists of a series of collection wells interconnected by above-ground laterals and a main header pipe connected to a flare station and electric generation plant. This system will be expanded as the landfill is developed to provide ongoing landfill gas control within the performance criteria established and mandated by the S)VAPCD and State and Federal regulations. The FL has two active landfill gas extraction systems. One system consists of 18 wells and provides control for parts of the northern portion of the site in the original Austin Road Landfill; landfill gas from this 18-well system is conveyed to the electric generation plant located at the northwest corner of the site. The second landfill gas extraction system encompasses the majority of the site, and consists primarily of 216 vertical gas wells. Landfill gas is collected through a perimeter 18-inch gas collection header and is destroyed at the flare station located at the northeast corner of the site. The flare station consists of two enclosed ground flares located at the northeast corner of the site, with a combined capacity of 5,400 cfm. The landfill gas collection and control system is more fully described in Section 3.3.4. The FL has a system of landfill gas perimeter probes located outside of the existing refuse footprint (see Figure B). Monitoring of these probes is performed quarterly in accordance with 27 CCR, Section 20919.5, and quarterly monitoring results are submitted to the LEA. Currently, there is no off-site gas migration in excess of applicable limits. Off-site migration has been documented on previous occasions; however, it is expected that the recent system improvements will Forward Landfill-Project Description 4-12 BRYAN A.STIRRAT&ABBOCIATES (j:\Allied\Forward\2007.0018 Lateral Expansion\Reports\Proj Descrip\021308 Final Proj Des\Sec 4.doc:2/13/2008)