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4. ENVIRONMENTAL ANALYSIS <br /> 4.6 AIR QUALITY <br /> • Excavators _ <br /> • Haul Trucks <br /> • Front End Loaders <br /> • Grader and Compactors <br /> • Dozer <br /> • Scrapers <br /> • Bobcat Loader <br /> • Maintenance Truck <br /> • Lube and Fuel Truck <br /> • Forklift <br /> • Pickup Trucks _ <br /> • Water Truck <br /> Although there are operational emissions of PMl0,the Valley Air District guidance does not <br /> provide for a significance threshold for PM10. However,the Proposed Project must comply with _ <br /> Regulation VIII with regards to visible emissions and opacity requirements as well as any <br /> Authority-to-Construct permits. Of the 355 tons per years of PM10 emissions from on-site <br /> processing equipment,63 percent is from the crushers,screening,conveyors, and other operations <br /> within the sand and gravel process, 16 percent is from unpaved roads,with the remaining from <br /> the concrete,asphalt,and sand dryer equipment. _ <br /> Tables 4.64A through 4.64C present the estimated project annual air emissions due to the <br /> project in 2007 and 2021 during a production level of 4 million, 2.85 million,and 1.7 million, _ <br /> respectively. Total ROG emissions from the quarry operations are less-than-significant. <br /> However,total NOx emissions from the quarry operations are significant. These results are <br /> largely due to operation of the sand dryer and haul truck operations, with additional contributions — <br /> from the on-site equipment(especially the on-site haul trucks, excavators,and loaders). The <br /> significance status does not change with production level. While several emission reducing <br /> measures are currently available,the extent that quantification of these reductions can be — <br /> conducted at this time is uncertain. These operational impacts are a significant and unavoidable <br /> impact of the Proposed Project. <br /> TABLE 4.64A <br /> OPERATIONAL EMISSIONS(TONS PER YEAR)* <br /> Estimated Project Estimated - <br /> Valley Air On-site Emissions Project <br /> District Processing (On-site Emissions <br /> Year Pollutant Thresholds Equipment Equipment) (Haul Trucks) Total _ <br /> 2007 ROG 10 1.64 1.50 4.71 7.85 <br /> NOx 10 62.0 29.9 56.1 148 <br /> PM10 - 355 1.92 1.65 359 <br /> 2021 ROG 10 1.64 1.10 1.41 4.15 <br /> NO, 10 62.0 16.7 10.7 89.4 _ <br /> PMIO - 355 1.74 0.76 358 <br /> Source: Environmental Science Associates,2004. <br /> Production level of 4 million. <br /> RMC Pacific Vemahs Quarry Mining and Reclamation Project 4.6-22 ESA 1203015 <br /> Administrative Draft ERR March 2054 <br />