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M. Environmental Setting,Impacts,and Mitigations G. Air Quality handled. Emission factors for the different operations were obtained from EPA AP-42 emissions manual. Total operating emissions are shown in Table III.G.2. The major source of PM10 would be material handling activities;PMIO emissions from equipment/vehicle exhausts would not be substantial. The project would result in additional emissions of 03 precursors(HC and NOx)in a region that is nonattainment for 03. Because of the waste reduction requirements imposed by AB 939,incoming waste quantities would not increase substantially. Since the project would not appreciably add to current levels of 03 precursor emissions,exhaust emissions from equipment and vehicle operations would not be a significant impact. The Pacific Energy(PEn)Company's power plant is currently operating close to full capacity (Donlon, 1993). The project would not change the operational parameters of the power plant and,so,would not increase criteria air pollutant emissions(unless the plant is expanded to handle higher gas volumes). If the power plant were to be expanded or upgraded to handle increased quantities of landfill gas,the existing air quality permit would need to be revised. The concomitant engineering evaluation would determine the need for additional air pollution control equipment. Since there are no plans to change the current operational parameters,criteria air emissions from the power plant would not change. Mitigation Measure G.2. None warranted. Impact G.3. Disposed wastes would increase the amount of gas generated at the landfill. (ADVERSE) When organic waste is initially placed in a landfill,it contains oxygen and decomposes aerobically for a short period of time, and produces mainly carbon dioxide. In the absence of oxygen,anaerobic decomposition takes place and the end products are primarily methane(CH4) and carbon dioxide(CO2),and other trace gases,including nitrogen,oxygen,NMOL (03 precursors),and odor. Landfill gas generation rates, as well as the percentage of each constituent gas generated,can vary greatly from landfill to landfill,and over time and location within the landfill. Depending on their chemical composition,wastes also would contribute to additional gas generation at the landfill. New landfill regulations would require the installation of landfill gas collection and disposal systems,such as flaring devices,to control methane emissions. Alternatively,landfill III.G.13