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ai <br /> SJVUAPCD's interim significance threshold of 82 lbs/day, it would combine with r 1 <br /> operational on-site PM10 emissions, which would exceed the SJVUAPCD's threshold for }� <br /> that pollutant. Mobile source emissions of NOX would exceed the SJVUAPCD interim <br /> significance threshold of 55 lbs/day and would be considered significant. Mobile source <br /> emissions of NOX would combine with ROG emissions to contribute to the Basin-wide <br /> nonattainment of state and federal ozone standards. This would be considered a <br /> significant adverse impact of Alternatives 1, 2, and 3. <br /> Processing Plant Emissions <br /> In addition to emissions from mining and reclamation activities on the project site, <br /> implementation of the proposed project would generate emissions from the aggregate and <br /> asphalt concrete processing plants. Pollutant emissions would consist of ROG, NO,,, CO, <br /> SOX, and PM,,. The mining activities proposed for the project site would allow the plant to <br /> process a maximum of 600,000 tons of aggregate per year. Emission estimates for the <br /> operation of the aggregate and asphalt concrete plants are based on emission rates of <br /> similar facilities, as provided by the SJVUAPCD, and operational rates provided by the <br /> proponent. <br /> Table 4.5-7 presents the estimated emissions generated by the asphalt concrete and <br /> aggregate processing plants. As indicated, implementation of Alternative 1, 2, or 3 could <br /> resuft in plant emissions of approximately 16 lbs/day of ROG, 129 lbs/day of NOX, 15 <br /> Ibsrday of SOX, nearly 191 lbs/day of CO, and approximately 337 lbs/day of PM,,. The <br /> projected plant emissions of NOX and PM,,) would exceed the SJVUAPCD significance <br /> threshold for each respective pollutant. This would be considered a significant adverse <br /> rrnpact of Alternatives 1, 2, and 3. ±- <br /> Table 4.5-7: Projected Processing Plant Emissions(Alternatives 1, 2, and 3) <br /> POLLUTANT(lbs/day) <br /> ACTIVITY ROG NOX SOX CO PM10 <br /> Asphalt Concrete Plant <br /> Aggregate Handling and Storage -- -- — 127.6 <br /> Dryer Drum with Baghouse 16.1 125.5 2.2 189.9 25.3 <br /> Asphalt Heater 0.1 3.6 12.9 0.9 1.5 <br /> Subtotal 16.2 129.1 15.1 190.8 154.4 <br /> Aggregate Plant' -- — -- _- 182.4 <br /> TOTAL PLANT EMISSIONS 16.2 129.1 16.1 190.8 336.8 <br /> SJVUAPCD Significance Thresholds2 55* 55* 150 550 80 <br /> ' Based on similar plant emission rate estimates provided by SJVUAPCD; assumes 8-hours of <br /> operation per day. <br /> z SJVUAPCD New Source Review Threshold <br /> * pounds per day equivalent <br /> Source: Gormley 1997•EDAW 1997 <br /> Draft Environmental Impact Report 4-76 ER-96-3 <br />