SITE INFORMATION AND CORRESPONDENCE

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903SOB-SS4 CON-51 oxidants. The latter two pollutants are related to motor vehicle emissions, with oxidants also associated with sunlight intensity. Many populated areas of California are in violation of the oxidant standard because of large amounts of both sunlight and automobile usage. TSPS in the San Joaquin Valley are primarily associated with windborne agricultural dusts. WCC has determined that the attainment status in the San Joaquin Valley AQCR has not changed. Note, however, that there is no longer a TSP standard, and that the area is designated as nonattainment for the new small particulate (PM10) standard (for particulate matter smaller than 10 microns in diameter) . 4.5.3 The USAEHA report discussed specific conclusions and recommendations to mitigate potential air quality impacts due to Depot operations. The details of the conclusions and recommendations can be reviewed in the EPA environmental air pollution assessment special study included in Appendix F. 4.5.4 DDRW Tracy maintains several Permits to Operate issued by the San Joaquin County Air Pollution Control District. The permits apply to many operations at the facility that are subject to air quality regulation. Copies of 13 of the Permits to Operate received from DDRW Tracy are n included in Appendix G. 4.5.5 The investigations conducted by both WCC and Radian Corporation included soil gas surveys. The results of these surveys are discussed above in Section 4.2. Section 5.1 of this report discusses the potential for the contaminant gases in the soil to emit and disperse into the atmosphere. The atmospheric emission and dispersion models used for this study are described in Appendix E. This model shows that the emission and subsequent dispersion of soil gas contaminants at the Depot do not pose a significant risk to public health. 4-195