Laserfiche WebLink
I <br /> UI <br /> I <br /> • Sensitive receptors located within a quarter mile of air toxic emissions or ! <br /> near CO hot spots; and <br /> t <br /> • Carcinogenic or air toxic contaminant emissions that exceed or contribute to <br /> an exceedance of the District's action level for cancer (one in a million), <br /> chronic (one) and acute (one) risks. <br /> Impact Analysis <br /> Air quality impacts associated with implementation of the proposed project and project <br /> alternatives fall into two major categories: <br /> • Short-term Construction Impacts: Emissions associated with the construction <br /> phases of the proposed project and alternatives. <br /> Long-term Mobile Source and Operational Emissions: Emissions associated CJ' <br /> with the operational phase of the proposed project and alternatives. <br /> Impact 4.5-1 <br /> Plant Construction Emissions (PM,o, ROG, NOJ <br /> Alternatives 1 2 and 3: All uar Excavation fives <br /> The total area required for the construction of the asphalt concrete plant, aggregate plant, <br /> and related facilities is estimated at approximately 11 acres. Construction of the facilities <br /> required to initiate the operational phase of the proposed project is expected to take <br /> approximately six to eight months to complete (Dessert, 1997). The construction phase <br /> of this project would generate emissions associated with the operation of diesel- and <br /> gasoline-powered construction vehicles, heavy-duty construction equipment, and employee { l <br /> vehicles. Emissions of fugitive dust (PM,,) would also be generated by wind erosion of J <br /> exposed graded surfaces. <br /> Projected construction-related emissions are presented in Table 4.5-4. These projected <br /> emissions are relevant to Alternatives 1, 2 and 3 as the construction activities proposed <br /> are identical for each of these alternatives. As indicated, the initial construction phase <br /> would generate approximately 671 lbs/day of PM,,, 3 lbs/day of ROG, and 18 lbs/day of <br /> NO, (uncontrolled emissions). Projected emission rates for ROG and NOx would not <br /> exceed the SJVUAPCD's interim significance threshold of 55 lbs/day for each pollutant. <br /> However, the estimated emission rate for PM,o would exceed the SJVUAPCD's interim <br /> significance threshold of 82 Ibslday. Therefore, short-term construction-related emissions <br /> of PM,oare considered a significant adverse impact of Alternatives 1, 2, and 3. <br /> Draft Environmental Impact Report 4-70 ER-96-3 <br />