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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES B. AIR QUALITY to be used in lieu of the proposed diesel-powered equipment. Assuming the use of an electric-powered tub grinder and flat screen would be feasible, overall exhaust diesel particulate emissions from motor vehicle and mobile equipment at buildout could be reduced by 8 pounds per day. Mitigation Measure B.5b: Where the use of electric-powered equipment is infeasible, the project applicant shall purchase alternative fueled-mobile equipment (e.g., compressed natural gas fueled forklifts)to the extent feasible. Mitigation Measure B.5c: For any diesel-powered mobile vehicles and equipment used at the site, the project applicant shall use"California diesel,"diesel fuel sold for on-road motor vehicles in California that must meet certain specifications (e.g.,low sulfur and low aromatic content). Use of"California diesel" would provide a 25 percent reduction in exhaust diesel particulates relative to conventional diesel fuel. Use of"California diesel"fuel in all off-road mobile equipment(including the tub grinder and flat screen) could reduce exhaust diesel particulates by an estimated 4 pounds per day. Mitigation Measure B.5d: The project applicant shall investigate and use the following technologies to reduce pailiculate emissions from diesel-fueled engines: exhaust treatment technologies that use catalytic and non-catalytic oxidation and filtration(e.g., exhaust gas purifiers, thermal oxidizers,and filters);engine modifications; and,fuel additives. Manufacturers have claimed that these technologies can achieve between a 10 and 95 percent reduction in particulate emissions. Assuming that these retrofit technologies could be used with all off-road mobile equipment and a removal efficiency of 25 percent could be achieved,overall exhaust diesel,particulates could be reduced by an estimated 4 pounds per day. Mitigation Measure B.5e: To the extent feasible, the project applicant shall purchase and/or phase in new diesel-powered mobile equipment that incorporates more stringent emissions standards mandated by the ARB. To demonstrate mandated engine improvements,post-1997 diesel-powered engines greater than 175 horsepower have an emission factor of 0.15 grams/horsepower-hour versus the post-1987 uncontrolled emission factor of 0.38 grams/horsepower-hour factor used to estimate project emissions. If post-1997 models were purchased for all equipment of 175 hp or greater,overall exhaust diesel particulates could be reduced by an estimated 8 pounds per day. Significance After Mitigation: Significant and Unavoidable. Impact B.6: The project would contribute to a cumulative air quality impact P J q y pact In the protect area(Significant). The project would result in the generation of air pollutants in the immediate vicinity of the site and along access roads,and would incrementally add to cumulative emissions. The project would incrementally add to ozone precursor emissions on a regional basis, and on a local basis would incrementally add to PM-10 emissions and could significantly add to toxic air contaminant emissions(see Impact B.5). Overall, the project's contribution to cumulative air quality Storkton Scavenger Transfer Station Expansion III.B.21 ESA/990190