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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES B. AIR QUALITY such as the SJVAB, are required to demonstrate conformity with the applicable State Implementation Plan. The net increase in project emissions would be well below this threshold. With further regard to PM-10 emissions,the SJVUAPCD's Regulation VIII would not apply to long-term operations associated with the project. Rule 8070 applies to projects that would generate fugitive dust from vehicle and/or equipment parking, shipping,receiving, transfer, fueling,and service areas on unpaved areas of one acre or larger. The purpose of Rule 8070 is to limit emissions of PM-10 through control of fugitive dust emissions from these types of activities. The project includes constructing an all-weather surface that provides a dust-and mud-free, permanent surface for the 3.6-acre bin storage area on the western parcel of the site. The all- weather surface would be made of concrete, asphalt, or other material that would comply with the definition of a paved surface in Rule 8070. It is unknown whether the proposed employee and visitor parking area would be paved as part of the project. This area is less than one acre in size and therefore would not be subject to District Rule 8070. Table III.13-3 shows that at buildout in 2003 the on-road motor vehicles and off-road mobile equipment associated with the project would generate an estimated 35 pounds per day of diesel particulates,an net increase of 34 pounds per day from existing conditions. Mobile equipment and on-road motor vehicle emissions each account for roughly 50 percent of the increase in emissions from existing conditions. Currently, there is no recognized significance threshold in which to compare the net increase in emissions of diesel particulates associated with the project. The District's thresholds of significance for toxic air contaminants (see Significance Criteria above)are risk-based and typically used in conjunction with a health risk assessment or more detailed air dispersion modeling. In lieu of an emissions-based threshold,the significance of diesel particulate emissions is addressed qualitatively in this document. Only upon completion of a more detailed modeling effort, which would estimate the annual average concentration (ug/m')at given receptor locations, would the risk posed by operations at the expanded Stockton Scavengers Transfer Station be accurately characterized. Given that the unit risk value established by the Office of Environmental Health Hazard Assessment(OEHHA)for exhaust diesel particulates (0.0003 ug/m') is substantially higher than many of the other toxic air contaminants commonly found in the environment(e.g., 10 times higher than the risk value for benzene,roughly 2 times higher than for 1,3-butadiene,and 50 times higher than for formaldehyde and perchloroethylene), it is assumed that the net increase in diesel particulate emissions associated with the project would be a significant impact of the project. Mitigation Measures Proposed as Part of the Project None. Mitigation Measures Identified in This Report Mitigation Measure B.5a: To the extent feasible, the project applicant shall purchase electric-powered mobile equipment (e.g., an electric-powered tub grinder and flat screen) Stockton Scavenger Transfer Station Expansion III.B.20 ESA 1990190