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the San Joaquin County Air Pollution About 50% of the County's land is used for Control District(SJUAPCD); it is also agricultural purposes; consequently, agricul- partially within Alameda County,under the tural burning is a primary source of particu- jurisdiction of the Bay Area Air Quality late matter. There are a few large sources of Management District(BAAQMD). Both criteria pollutant emissions in the nearby districts monitor air quality to gauge prog- City of Tracy, including a Naval Depot. ress toward attainment of federal and State ambient air quality standards, and are The 1982 San Joaquin Air Quality Manage- currently in nonattainment of standards for ment Plan contains strategies designed to carbon monoxide (CO), ozone and particu- bring CO and ozone air quality into lates (PM10). Because the SJCAPCD compliance with State and federal stan- monitoring stations are more reflective of dards. These strategies are largely based the air quality conditions in the vicinity of upon restrictions on emissions-producing the project site, and most of the site lies activities such as fuel combustion, surface within the SJAPCD's jurisdiction,this coatings, fuel handling, etc. The California section focuses on the existing conditions Air Resources Board has been designated as and compliance planning of the San Joaquin the lead agency for particulate matter Valley Air Basin. planning because it is a valley-wide prob- lem. Topographic and meteorological conditions play an important role in the buildup of Noise: atmospheric pollutants in the basin. The trough-like configuration of the valley also The project site is primarily a quiet, rural forms an ideal trap for pollutants. The setting. The primary sources of noise in the mountain ranges surrounding the valley vicinity are vehicular traffic and agricultural restrict the horizontal airflow. In combina- machinery, with intermittent noise gener- tion with temperature inversions, (an ated by crop dusting aircraft. increase in temperature with height) which traps pollutants close to the ground,the air The Noise Elements of both San Joaquin is prevented from rising vertically above the County and Alameda County General Plans height of the mountains and dispersing air have been developed to identify existing contaminants. In the summertime high noise problem areas and high noise sources temperatures accelerate the rate of smog in the County, and provide goals and concentration and high pressure creates policies whose implementation will improve stable air with low wind speeds which the overall noise environment. The Noise further prevents atmospheric mixing and Elements contain guidelines for the determi- dispersion of pollutants. nation of the compatibility of various land uses with different noise environments. The noise campatibility of a given land use is Site Description 3.5