2019-090 - Adopting the Mitigated Negative Declaration

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*:/:I1-3Ill ira Table 1 Ambient Air Quality Standards for Criteria Pollutants California Federal Primary Pollutant Averaging Time Standard' Standardz Major Pollutant Sources Lead (Pb) 30-Day Average 1.5 Ng/m3 Present source: lead smelters, battery manufacturing & recycling facilities. Past Calendar Quarter * 1.5 Ng/m3 source: combustion of leaded gasoline. Rolling 3-Month * 0.15 Ng/m3 Average Sulfates (SO4P 24 hours 25 Ng/m3 * Industrial processes. Visibility Reducing 8 hours ExCo=0.23/km No Federal Visibility -reducing particles consist of Particles visibility of 10>_ Standard suspended particulate matter, which is a miles complex mixture of tiny particles that consists of dry solid fragments, solid cores with liquid coatings, and small droplets of liquid. These particles vary greatly in shape, size and chemical composition, and ran be made up of many different materials such as metals, soot, soil, dust, and salt. Hydrogen Sulfide 1 hour 0.03 ppm No Federal Hydrogen sulfide (H2S) is a colorless gas with Standard the odor of rotten eggs. It is formed during bacterial decomposition of sulfur -containing organic substances. Also, it can be present in sewer gas and some natural gas, and can be emitted as the result of geothermal energy exploitation. Vinyl Chloride 24 hour 0.01 ppm No Federal Vinyl chloride (chlorcethene), a chlorinated Standard hydrocarbon, is a colorless gas with a mild, sweet odor. Most vinyl chloride is used to make polyvinyl chloride (PVC) plastic and vinyl products. Vinyl chloride has been detected near landfills, sewage plants, and hazardous waste sites, due to microbial breakdown of chlorinated solvents. Source: GARB 2016. Notes: ppm: parts per million; pgrm3: micrograms per cubic meter * Standard has not been established for this pollutant/duration by this entity. 1 Caldomia standards for 03, CO (except 8-hour Lake Tahoe), S02 (1 and 24 hour), NO2, and particulate matter (PMio, PM2.5, and visibility reducing particles), are values that are not to be exceeded. All others are not to be equaled a exceeded. Califemia ambient air quality standards are listed in the Table of Standards in Section 70200 of Title 17 of the California Code of Regulations. 2 National standards (other than 03, PM, and those based on annual arithmetic mean) are not to be exceeded more than once a year. The 03 standard is attained when the fourth highest 8-hour concentration measured at each site in a year, averaged over three years, is equal to or less than the standard. For PMio, the 24-hour standard is attained when the expected number of days per calendar year with a 24-hour average concentration above 150 pg/m3 is equal to a less than one. For PM25, the 244wur standard is attained when 98 percent of the daily concentrations, averaged over three years, are equal to or less than the standard. 3 On October 1, 2015, the national 8-hour ozone primary and secondary standards were lowered from 0.075 to 0.070 ppm. 4 On December 14, 2012, the national annual PM2.5 primary standard was lowered from 15 pg/m3 to 12.0 pghm3. The existing national 24-hour PM25 standards (primary and secondary) were retained at 35 pgl m3, as was the annual secondary standard of 15 pg/m3. The existing 24-hour PMio standards (primary and secondary) of 150 pg1m3 also were retained. The form of the annual primary and secondary standards is the annual mean, averaged over 3 years. 5 On June 2, 2010, a new 1-hour S02 standard was established and the existing 24-hour and annual primary standards were revoked. The 1-hour national standard is in units of parts per billion (ppb). Caldomia standards are in units of parts per million (ppm). To directly compare the 1-hour national standard to the California standard the units can be converted to ppm. In this case, the national standard of 75 ppb is identical to 0.075 ppm. 75C-141