West Mojave Plan FEIR/S - Desert Managers Group

POLLUTANTOzone (O 3 )RespirableParticulateMatter(PM 10 )FineParticulateMatter(PM 2.5 )CarbonMonoxide(CO)NitrogenDioxide(NO 2 )LeadSulfurDioxide(SO 2 )VisibilityReducingParticulatesTable 3-7Ambient Air Quality StandardsAVERAGING CALIFORNIA STANDARDSFEDERAL STANDARDSTIMEPrimarySecondary1 hour 0.09 ppm (180 µg/m 3 ) 0.12 ppm (235 µg/m 3 ) Same as Primary Standard8 hourAnnual geometric____Mean 20 µg/m 3 Same as Primary StandardAnnual Arithmetic____ 50 µg/m 324 hour 50 µg/m 3 150 µg/m 3Mean24 hour 65 µg/m 3Annual ArithmeticSame as Primary StandardMean 12 µg/m 3 15 µg/m 38 hour1 hour8 hour(Lake Tahoe)Annual Arithmetic____ 0.053 ppm (12 µg/m 3 )Mean1 hour 0.25 ppm (470 µg/m 3 )Chapter 3 3-51NoneSame as Primary Standard30 day average 1.5 µg/m 3Calendar quarter 1.5 µg/m 3 Same as Primary StandardAnnual Arithmetic0.030 ppm (80 µg/m 3 )Mean24 hour 0.04 ppm (105 µg/m 3 ) 0.14 ppm (365 µg/m 3 )3 hour 0.5 ppm (1300 µg/m 3 )1 hour 0.25 ppm (655 µg/m 3 )8 hourIn sufficient amount to produce an(10 am toextinction coefficient of 0.23 per6 pm, PST) kilometer ___ visibility of ten miles orNomore (0.07_30 miles or more for LakeTahoe) due to particles when the relativeFederalhumidity is less than 70 percent.Method: ARB method V (8/18/89)Standards1 hour 0.03 ppm (42 µg/m 3 )Sulfates 24 hour 25 µg/m 3HydrogenSulfideAreas that are classified as nonattainment by the USEPA are required to prepare andimplement a State Implementation Plan (SIP) that identifies and quantifies sources of emissionsand presents a comprehensive strategy to control and reduce locally generated emissions.Air quality quality degradation and exceedances of the ambient air quality standards havebeen episodal in nature. High PM 10 concentrations that violated the National Ambient AirQuality Standards peaked in the early 1990s. In recent years, good monitoring data has led toreclassification requests to the USEPA for most of the region. Implementation of dust controlrules and controls on a number of critical sources have led to the reductions in PM 10concentrations. The numbers of violations of the NAAQS for ozone has declined, but violationshave continued. Rules establishing controles for Ozone precursor enissions have beenimplemented, but overwhelming transport of pollutants from the South Coast Air Basin and theSan Joaquin Valley Air Basin continually impacts the desert. Both the South Coast and the SanJoaquin Valley are both classified as serious nonattainment areas (see Table 3-8). The SouthernCalifornia Association of Governments (SCAG) has projected population growth and future