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III. Environmental Setting, Impacts,and Mitigations G. Air Quality Local The project site is in San Joaquin County,under the jurisdiction of the Northern Office of the SJVUAPCD. The SJVUAPCD regulates air quality through its permit authority over most types of stationary emission sources and through its planning and review activities. The 1991 Air Quality Attainment Plan(AQAP)describes the Valley's current plans for meeting State clean air laws(SJVUAPCD, 1992). The goal of the Plan is to improve air quality through the 1990's by all feasible means,including tighter industry controls,cleaner cars and trucks, cleaner fuels,and increased commute alternatives. The Plan encourages cities and counties to adopt measures in support of this goal. Identified measures include: a permitting program that achieves no net increase in stationary source emissions, and Best Available Retrofit Control Technology for existing stationary sources. Rules 4105 4651 and 4002 of SJVUAPCD's Rules and Regulations are concerning landfills; 4105 deals with general landfill emissions,4651 deals with volatile organic compound emissions,and 4002 deals with asbestos. There are no specific rules or regulations regarding landfill gas collection and disposal systems(Petersen, 1993). Stationary sources of air pollutants, such as landfills, normally are subject to an air quality permit process,by which an engineering evaluation is done of project emissions,effectiveness of pollution control equipment, and pollution potential after emission controls. Best Available Control Technology(BACT)is a set of standard mitigation measures,normally implemented as a permit condition,designed to reduce air pollutant emissions. There are specific emission thresholds above which BACT would be required. Existing Air Quality The APCD's regional air quality monitoring network provides information on average concentrations of criteria air pollutants. Table III.G.1 is a five-year summary of the highest annual concentrations for the criteria air pollutants,for which the region is in non-attainment(03 and PM10),collected at the APCD's nearest air quality monitoring station at Stockton-Hazelton Street. CO concentrations are also included in the table,even though only urbanized portions of the region are exposed to ambient CO violations. The data collected(except for CO,which is site-specific)are expected to be representative of air quality in the project area,because of the station's proximity(about 25 miles)to the project site. In Table III.G.1,air pollutant concentrations are compared with the SAAQS air quality standards,which are more stringent III.G.S