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III Environmental Setting, Impacts, andMitigations G. Air Quality attainment status (SJVUAPCD, 1992). The plan,however,does not project attainment of air quality standards by 1997. Under the CCAA,districts must then provide emission reductions of five percent per year or include every feasible measure in the AQAP. California State law defines TACs as air pollutants having carcinogenic effects. Assembly Bill (AB) 1807 (the Tanner Bill,passed in 1983)established the State Air Toxics Program and the methods for designating certain air toxics as TACs. Under the 1807 process, a total of 18 substances have been identified as TACs by the ARB,and four other substances were to be reviewed for inclusion in the list of designated TACs(Martz, 1993). AB 2728 requires the classification of all the federally identified HAPs as TACs,without additional review,for the purposes of California law. The Air Toxics Hot Spots Information and Assessment Act of 1987 (AB2588)provides for the regulation of over 200 air toxics,including all of the designated TACs. Under the Act, sources emitting more than 10 tons per year of any criteria air pollutant must estimate and report their toxic air emissions to the local Air Districts. The local Air Districts then prioritize facilities on the basis of emissions,and high priority facilities are required to submit a health-risk assessment and communicate the results to the affected public. California has implemented air emissions regulations for landfills under the state's air pollution control authority. The state has established control criteria, collection and control system requirements,testing and reporting requirements, and exemption criteria for municipal solid waste landfills. Control criteria include levels of tested air contaminants,average maximum concentrations of total organics over a certain area, and maximum concentration of organic compounds as methane at any location (EPA, 1991 a). The Calderon Amendments to the California Health and Safety Code require that all landfills perform gas and ambient air testing for ten compounds (vinyl chloride,benzene,ethylene dibromide,ethylene dichloride, methylene chloride,perchloroethylene,carbon tetrachloride, methyl chloroform,trichloroethylene,chloroform,ethylene dichloride,and methyl chloroform), and report the results to the local Air Districts. The primary objective of these tests,the(Air Quality) Solid Waste Assessment Tests(SWAT),is to provide a screening basis to characterize landfill air releases and subsurface gas migration at landfills. III.G.4