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i f � y reclamation activities would occur concurrently during the approximately 56-year mining and reclamation period. Exhaust emissions from mining and reclamation activities include i emissions associated with the transport of machinery and supplies to and from the project site, emissions produced on-site through .equipment use, and emissions from trucks i transporting mined materials across the project site to the processing plant. Estimated i regional mobile source emissions are presented in Table 4.5-6 for Alternatives 1, 2, and i 3. Implementation of Alternatives 1, 2, and 3 would also result in off-site mobile source emissions from truck and employee trips generated by processing plant operations. The , proposed project is anticipated to generate a daily average of 300 truck trips (150 truck loads) and employ approximately five to ten individuals (Bowman, 1997). To determine I` mobile source emissions associated with truck and employee trips, an assessment was conducted using the computer model URBEMIS5, a model recommended by regulating air quality agencies for determination of mobile-source emissions. The truck and employee i trip component of regional mobile source emissions are also presented in Table 4.5-6 (in r the row entitled "Off-Site Truck and Employee Trips"). Table 4.5-6: Projected Regional Mobile Source Emissions From Equipment and Motor Vehicles (Alternatives 1, 2, and 3) I .r POLLUTANT(lbs/day) ACTIVITY ROG CO NOx PM10 On-site Mobile Equipment Exhaust' 0.5 10.1 5.7 0.6 Off-site Truck and 'Employee Tri s 46.2 191.0 256.0 48.9 p jll TOTAL MOBILE SOURCE EMISSIONS 46.7 201.1 261.7 49.5 SJVUAPCD Interim Significance Thresholds' 55 550 55 82 ' Based on U.S. EPA AP-42 emission factors and methodology obtained from SMAQMD Air Quality Thresholds of Significance, ,tune 1995. Assumes operation of 1 scraper and 1 loader, 8 hrslday I each. !i 2 Based on URBEMIS5 modeling results. ROG amounts obtained by multiplying TOG emissions by l .915 (GARB, 1995). 3 Converted to pounds per day equivalent. k a Source: SMAQMD 1995;EDAW 1997 . . As indicated, the estimated regional mobile source emissions would total approximately I 47 lbs/day of ROG, 201 lbs/day of CO, 262 lbs/day of NOx, and nearly 50 lbs/day of PM, l Mobile source emissions of ROG and CO do not, by themselves, exceed SJVUAPCD's significance thresholds. Because CO emissions tend to disperse rapidly, CO is typically analyzed as a localized pollutant and is not anticipated to contribute significantly to regional CO pollutant levels. Although mobile source emissions of PM,, would be less than the h . ii Draft Environmental Impact Report 4-75 ER-96-3 ?i II