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Draft Supplemental Environmental Impact Report Page III-28 Forward Inc.Landfill 2014 Expansion Project landfill gas extraction system encompassed the majority of the site, and consisted primarily of 223 vertical gas wells,of which 24 were installed in 2011 and 46 were installed in 2012, eight horizontal collectors and four leachate collection risers. Landfill gas is collected through a main perimeter 18- inch gas collection header with associated lateral pipelines connected to the extraction wells which 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 consisted of two enclosed ground flares located at the northeast corner of the landfill,with a combined capacity of 5,400 cubic feet per minute(cfm). Recently,these two collection systems were combined into a single system. Currently,the LFG flares combust up to 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 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. Odor J Odor is controlled at the landfill by (1) timely placement of daily, intermediate and final soil cover over the refuse fill;and (2)planting and maintenance of a vegetated cover on completed fill slopes. Air Quality Monitoring Landfill Gas Monitoring Landfill gas monitoring is performed on a quarterly basis at the existing Forward Landfill. Twenty-nine landfill-gas probes incorporating 83 sampling points" are in the compliance monitoring system and are located around the perimeter of the existing landfill and the Each landfill gas probe can contain multiple sampling points.