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BENDER READY-MIX CONCRETE MANUFACTURING PROJECT <br />(9) Initial Study/Mitigated Negative Declaration <br />Table 4.3.1 <br />Construction Air Emissions <br />t <br />Ei <br />l <br />-r? <br />C <br />t <br />sl <br />rti <br />S ?? F.oltutant " undslda <br />ons <br />n <br />ruc <br />top <br />s <br />ons <br />c <br />rce ROG NOx CO ". ' 1:402. i PMio PCVIzs <br />Unmitigated Emissions 3.19 27,70 14.55 0.01 2.05 1.24 <br />Mitigated Emissions2 3.19 27.70 14.55 0.01 1.79 1.24 <br />SCAQMD Thresholds 75 100 550 150 150 55 <br />Is Threshold Exceeded? No No No No No No <br />ROG = reactive organic gases; NOx = nitrogen oxides; CO = carbon monoxide; S02= sulfur dioxide; PMio = particulate matter up to 10 <br />microns; PM2.5 =particulate matter up to 2.5 microns <br />Notes: <br />1. Emissions were calculated using the URBEMIS 2007 version 9.2.4 Computer Model, as recommended by the SCAQMD. <br />2. Mitigated emissions refer to the inclusion of SCAQMD Rule 403 (Fugitive Dust), which requires exposed soils to be watered twice daily. <br />Refer to Appendix A, Air Quality/Greenhouse Gases Data, for model output sheets. <br />Naturally Occurring Asbestos <br />Asbestos is a term used for several types of naturally occurring fibrous minerals that are a human <br />health hazard when airborne. The most common type of asbestos is chrysotile, but other types such as <br />tremolite and actinolite are also found in California. Asbestos is classified as a known human <br />carcinogen by State, Federal, and international agencies and was identified as a toxic air contaminant <br />by the California Air Resources Board in 1986. <br />Asbestos can be released from serpentinite and ultramafic rocks when the rock is broken or crushed. <br />At the point of release, the asbestos fibers may become airborne, causing air quality and human health <br />hazards. These rocks have been commonly used for unpaved gravel roads, landscaping, fill projects, <br />and other improvement projects in some localities. Asbestos may be released to the atmosphere due <br />to vehicular traffic on unpaved roads, during grading for development projects, and at quarry <br />operations. All of these activities may have the effect of releasing potentially harmful asbestos into the <br />air. Natural weathering and erosion processes can act on asbestos bearing rock and make it easier for <br />asbestos fibers to become airborne if such rock is disturbed. According to the Department of <br />Conservation Division of Mines and Geology, A General Location Guide for Ultrarnafrc Rocks in <br />California - Areas More Likely to Contain Naturally Occurring Asbestos Report (August 2000), <br />serpentinite and ultramafic rocks are not known to occur within the project area. Thus, there would be <br />no impact in this regard. <br />OPERATIONAL EMISSIONS <br />Mobile Source <br />Long-term air quality impacts consist of mobile source emissions generated from project-related traffic <br />and from stationary source emissions. The project would result in on-site aesthetics, drainage/water <br />quality, and safety improvements required for CUP compliance. These improvements would not alter or <br />expand existing concrete manufacturing operations at the facility. Although there would be no new or <br />increased long-term operational emissions, existing operational emissions have been quantified. <br />Project operations generate approximately 88 daily trips (accounting for 12 employees and assuming <br />20 truck loads per day). <br />u <br /> <br /> <br /> <br /> <br /> <br /> <br />t <br /> <br />J <br /> <br /> <br /> <br /> <br />r] <br /> <br /> <br /> <br />JULY 2011 <br />4.3-4 <br />31A-42 <br />AIR QUALITY I