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Mitigation measures for noise were recommended in the 2002 Consolidated Forward Landfill EIR. Forward has been complying with the mitigation measures. No noise complaints have been received by Forward in the last several years. 3.3.4 AIR QUALITY San Joaquin County is located within the San Joaquin County Valley Air Basin (SJVAB). The SJVAB is defined by the Sierra Nevada Mountains in the east, the Coast Range in the west, and the Tehachapi Mountains in the south. The valley opens to the sea in the north at the Carquinez Straits via San Francisco Bay. The region's topographic features restrict air movement throughout the basin, resulting in weak air flow which becomes stagnant when high barometric pressure forms over the region. The SJVAB is highly susceptible to pollution accumulation over time. Stagnation effects are more pronounced in the southern portion of the valley, but the Stockton area also experiences prolonged periods of restricted atmospheric dispersion. Because of the poor ambient air quality, Forward has been active in preventing further degradation of air quality at the landfill site by implementing monitoring and control programs for landfill gas, dust, asbestos, ash, and odors. In addition, Forward complies with Federal, State and local regulations. The SJVAPCD has jurisdictions over air quality matters in the SJVAB. Air quality at FL has been evaluated in support of both the Forward Landfill and former Austin Road Landfill EIRs. Landfill impacts were evaluated for the following general emission sources: • On-road vehicles (refuse trucks) and on-site landfill equipment • Landfill gas (LFG) collection/disposal including fugitive LFG • Fugitive dust • Off-site odors[ Landfill gas emissions are controlled by a landfill gas control system comprised of two distinct functions: extraction/collection and control/destruction. The LFG collection system is installed within the refuse and along the perimeter of the refuse to control lateral migration of landfill gas. At this time, the collection Forward Landfill- Project Description 3-10 BRYAN A.$TIRRAT&ASSOCIATES J:\Allied\Forward\2007.0018 Lateral Expansion\Reports\Proj Descrip\021308 Final Proj Des\Sec 3.doc:2/13/2008)