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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES B. AIR QUALITY TABLE III.B-3 ESTIMATED PM-10 AND DIESEL PARTICULATE EMISSIONS ASSOCIATED WITH THE EXPANDED STOCKTON SCAVENGER TRANSFER STATION Emissions in pounds per day Existing Net Existing Net Plus Change Plus Change Existing Project vs. Project vs. Emissions Sourcea Pollutant (1999) (2000) Existing (2003) Existing Motor Vehicles Total PM-10 5 35 30 54 49 Diesel Particulate 1 15 14 19 18 Mobile Equipment Total PM-10 0 10 10 16 16 Diesel Particulate 0 10 10 16 16 Totalb Total PM-10 5 45 40 70 65 Diesel Particulate 1 24 23 35 34 a Emissions sources include"motor vehicles"(on-road certified trucks and automobiles)and"mobile equipment" (loaders,forklift,tub grinder,excavator,flat screen,and a roll-off truck). See Appendix B for detailed calculations of emissions from these sources. b Numbers may not sum due to rounding. equipment. Emissions estimates shown in Table III.13-3 take into account the downward trend in emissions per vehicle-mile-traveled from on-road motor vehicles. Emissions estimates for off-road mobile equipment are based on the proposed list of off-road diesel-powered equipment and associated horsepower ratings and an assumed period of operation. For emissions calculation purposes, it was conservatively assumed that each piece of off-road equipment at the site could be operated for up to 13 hours per day, which reflects the span of operating hours on Mondays through Saturdays. Table III.13-3 shows that at buildout in 2003 on-road motor vehicles and off-road mobile equipment associated with the project would generate an estimated 70 pounds per day of total PM-10, an increase of 65 pounds per day from existing conditions. Assuming the site could operate at this level 312 days per year(Mondays through Saturdays), the project could generate up to 10.9 tons of PM-10 per year. This is an extremely conservative assumption given that it is unlikely that transfer trucks would travel 190 miles to WMI"s landfill in Nevada every operating day of the year. The emission estimates shown in Table III.13-3 do not account for fugitive PM- 10-emissions associated with greenwaste handling,construction and demolition debris handling, and fuel storage and handling activities at the site. Emissions from these sources would not be substantial sources of PM-10. The SJVUAPCD does not have an established significance threshold in which to compare the net increase in PM-10 emissions associated with the project. For comparative purposes,the U.S. EPA has established a threshold of 70 tons per year for which projects involving federal actions within areas designated as serious non-attainment for PM-10, Stockton Scavenger Transfer Station Expansion 111.13.19 ESA/990190