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Draft Supplemental Environmental Impact Report Page III-33 Forward Inc.Landfill 2018 Expansion Project collectors and provided control for parts of the northern portion of the site(the former Austin Road Sanitary Landfill). Landfill gas from this 18-well system was conveyed to the formerly operating Covanta/Republic electric generation plant located at the northwest corner of the site (see Existing Landfill Storage and Support Facilities,above). The Covanta/Republic plant is no longer operational. The second GCCS encompassed the majority of the site,and consisted primarily of vertical gas wells, horizontal collectors and leachate collection risers.These two GCCSs have since been combined into a single system.Currently,there are 164 active wells on the Austin Road side of the landfill and 31 on the Forward side. Landfill gas is collected through a main perimeter 18-inch gas collection header with associated lateral pipelines connected to the extraction wells. The LFG is then combusted at the flare station located at the northeast corner of the site or the adjacent Ameresco Landfill Gas to Energy Facility(LFGTE). The flare station consists of two enclosed ground flares located at the northeast corner of the landfill,with a combined permitted capacity of 5,400 standard cubic feet per minute(cfm).Currently,the LFG ' flares combust approximately 2,500 cfm,and the Ameresco LFGTE facility utilizes up to approximately 1,400 cfm for electrical generation. It is anticipated that the newly operational Ameresco Landfill Gas to Energy plant(see G.Recent and Proposed Projects at the Forward Landfill,below)will eventually use most or all of the gas from the combined collection system. Any remaining gas will be flared as needed to maintain compliance. Dust Dust is controlled at the landfill by (1)maintenance of haul roads (paving,grading,and watering);(2)application of fine water spray (minimum of twice daily) on the active soil-covered work areas, soil excavation areas, and soil stockpile areas where conditions may result in fugitive dust; (3) application of organic dust suppressant, and (4) limiting the speed of all on-site vehicles to less than those that would cause visible dust emissions behind the vehicle. For dust control purposes, surface-water runoff or on-site well water is applied to all main access and haul roads and unpaved equipment-parking areas at least once per day. All-weather surfacing is applied to any unpaved road segment that carries 50 or more vehicle trips per day continuously for more than thirty days. The track-out of mud and dirt onto Austin Road is limited by having an approximately 850-foot long paved exit road that allows mud and dirt to drop off before exiting the site, removing the mud and dirt from the interior paved road and Austin Road on a daily basis, and use of a wheel washer. After the 2013 EIR was prepared, the existing tire wash system at the site's main driveway for vehicles exiting the site was replaced by an improved system to remove sediment from tires and undercarriages, and to prevent sediment from being transported onto public roadways. The new truck wash system is similar to the "Entrance/Outlet Tire Wash TC-3" described in the California Department of Transportation, "Caltrans Storm Water Quality Handbooks Construction Site Best Management Practices Manual", Section 6, dated March 1, 2003. In the 2013 EIR, this tire washing system was described as part of the previously proposed project.