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4. ENVIRONMENTAL ANALYSIS 4.6 AIR QUALTfY 2. Bird and Blewett 3. Bird and SR 132 4. Koster and SR 132 5. Welty and SR 132 6. McCracken and SR 132 7. Blewett and Welty 8. SR 132 and Interstate 5 9. SR 132 and Interchange 580 10. Interstate 5 and Interstate 580 The screening method set forth in California Line Source Dispersion Model(CALINE)was used to estimate worst-case CO concentrations during the peak hour at the intersection of Blewett and Koster(now South Costa Ranch Road). As this intersection is most affected by project-related ~ traffic,it was assumed that if CO concentrations at this intersection would not exceed the ambient air quality standards,the project's contribution to impacts at other intersections affected by _ project traffic to a lesser extent,would be less substantial. Two proposed haul routes were examined(see the Transportation and Traffic section for more details): 1. All trucks entering and exiting the site uses Blewett and Bird Roads. 2. Similar distribution to above with the exception that trucks will have the option of using Koster Road for access to and from SR 132. The method indicated no potential for violation of the 1-hour and 8-hour CO standards at any of the intersections and for all scenarios analyzed. The increase in the 1-hour maximum concentration due to the Project would be 0.2 ppm. A persistence factor of 0.7 was used to estimate the contribution of the project to ambient 8-hour CO concentrations. The project _ increment was added to the ambient 8-hour concentration in the Project Area. CO levels are projected to be significantly lower in the future due to emission control technology improvements in the automobile fleet, attrition of older, high-polluting vehicles,and improved fuel mixtures. -- Such reduction would more than offset any effects of increase in traffic due to project and cumulative development. Thus,project-related and cumulative traffic would have a less-than- significant impact on local CO concentrations. Mitigation Measure: No mitigation required. Impact 4.6.6: Project DPM Impact of Haul Trucks. Traffic generated by the project would have the potential to affect DPM concentrations along surface streets and near stagnation points such as major highways and heavily traveled and congested roadways. This impact is significant. r RMC Pacific V=ahs Quarry Mitdne and Reclamation Project 4.6-27 ESA/203015 Adminis=fi,e Dmfi©R Mmch 2004