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III. Environmental Setting, Impacts, and Mitigations G. Air Quality IMPACTS AND MITIGATION MEASURES Air quality impacts from the proposed project would primarily arise from dust emissions associated with landfill operations. Exhaust emissions from landfill equipment and vehicles would generate criteria air pollutants. Haul trucks,hauling wastes from outside sources,would generate vehicular emissions,both criteria and toxic. Landfill gases,odor and toxic air emissions from decomposing waste materials at the landfill are other potential sources of air pollution. Significance Criteria According to CEQA,a project would have a significant impact if it caused or contributed to the violation of standards,exposed sensitive receptors to substantial concentrations of air pollutants, or is inconsistent with established plans and policies. The SJVUAPCD is currently formulating standards to evaluate the significance of air emissions from new projects(Kwong, 1993). The air quality permit process,required by law,would provide for an engineering evaluation of project- related emissions. The primary pollutant of concern from a landfill is PM10;the SJVUAPCD has established an offset threshold of 80 lb/day. Any project that would cause PM10 emissions above the offset threshold would be considered to have a significant effect on air quality(Kwong,.1993b). For landfills,no other threshold levels have been established for BACT or other regulatory requirements (Petersen, 1993). Landfill gas emissions would be significant if established gas collection and disposal procedures are not followed. Toxic air emissions would be a significant health effect if the number of project-generated additional cancer cases exceed ten in a million. Odor impacts would be significant if the project would likely result in a substantial increase in the number of complaints from nearby residents. Methodoloev PM10 emissions from off-site haul trips,and on-site equipment/vehicle movement over unpaved surfaces are estimated using published emission factors(EPA, 1987). Stationary sources, such as landfill gas collection systems and stockpiles,are evaluated to determine pollution potential. An emissions inventory is compiled,and project-generated emissions are compared with projected County-wide emissions to determine the project's relative contribution. Total project emissions are also compared against the significance threshold levels. The potential to cause adverse odor impacts are evaluated on the basis of available information with respect to types and quantity of III.G.9