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4.Environmental Analysis — PMIo standard in 2002, pursuant to the Children's Environmental Health Protection Act. The — revised PMto standard is 20 pg/m'for an annual average. In addition,CARB adopted a PM2.5 standard set at 12 pg/m'for an annual average. Hydrogen Sulfide Hydrogen sulfide is found in nature around some hot springs,geothermal sources, and oil fields (sour gas). It is also produced by anaerobic decomposition,and is sometimes called swamp gas. The human nose can detect 112S at concentrations well below toxic levels. Heavier than air, this gas is considered obnoxious and unpleasant. At higher levels,it desensitizes the nose,and can be fatal because it blocks oxygen uptake by the blood.Mainly a health threat to industrial workers, hydrogen sulfide is usually regulated to eliminate nuisance for nearby residents or property owners. California has established state ambient air quality standard for hydrogen sulfide of 0.03 ppm(42µg/m'). Toxic Air Contaminants Toxic air contaminants (TACs) are pollutants that are associated with acute,chronic,or carcinogenic effects but for which no ambient air quality standard has been established. TAC — impacts are evaluated by determining if a particular chemical poses a significant risk to human health and, if so, under what circumstances. The ambient background of TACs is the combined result of many diverse human activities, including operation of gasoline stations, refineries, automobiles, as well as industrial operations and painting operations. In general, mobile sources (such as diesel)contribute more significantly to health risks than stationary sources. Odors and Nuisances Though offensive odors from stationary sources rarely cause any physical harm,they still remain unpleasant and can lead to public distress generating citizen complaints to local governments.The occurrence and severity of odor impacts depend on the nature,frequency and intensity of the — source; wind speed and direction; and the sensitivity of receptors. The CEQA Guidelines recommend that odor impacts be considered for any proposed new odor sources located near existing receptors, as well as any new sensitive receptors located near existing odor sources. — Generally,increasing the distance between the receptor and the source will mitigate odor impacts. Regulatory Agencies — Air quality within the SJVAB is addressed through the efforts of various federal, state,regional, and local government agencies. The air quality management agencies with jurisdiction over the — air quality conditions of the project area include the U.S. EPA, GARB, and the Valley Air District. The U.S.EPA has established federal ambient air quality standards for which CA-RB and the Valley Air District are also responsible for ensuring that state ambient air quality standards are met. U.S. EPA is responsible for implementing programs established under the federal Clean Air Act, such as establishing and reviewing the national ambient air quality standards and judging the RMC Pacific Vernalis Quarry Mining and Reclamation Project ESA 1203015 Draft Environmental Impact Report May 2006