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4 Environmental Analysis 4.3 Air Quality than one.For PM2 e,the 24-hour standard is attained when 98 percent of the daily concentrations,averaged over 3 years,is equal to or less than the standard. Contact the U.S.Environmental Protection Agency(USEPA)for further clarification and current national policies. 3/Concentration expressed first in units in which it was promulgated. Equivalent units given in parentheses are based on a reference temperature of 25 degrees Celsius(°C)and a reference pressure of 760 torr.The torr(symbol:Torr)is a non-Standard International unit of pressure with the ratio of 760 to 1 standard atmosphere,chosen to be approximately equal to the fluid pressure exerted by 1 millimeter of mercury(Hg),i.e.,a pressure of 1 Torr is approximately equal to 1 millimeter of Hg.Most measurements of air quality are to be corrected to a reference temperature of 25°C and a reference pressure of 760 torr;ppm in this table refers to ppm by volume,or micromoles of pollutant per mole of gas. 4/Any equivalent procedure which can be shown to the satisfaction of the California Air Resources Board(CARB)to give equivalent results at or near the level of the air quality standard may be used. 5/National Primary Standards:The levels of air quality necessary,with an adequate margin of safety to protect public health. 6/National Secondary Standards:The levels of air quality necessary to protect the public welfare from any known or anticipated adverse effects of a pollutant. 7/Reference method as described by the USEPA.An"equivalent method"of measurement may be used but must have a"consistent relationship to the reference method"and must be approved by the USEPA. 8/To attain the 1-hour national standard,the 3-year average of the annual 98th percentile of the 1-hour daily maximum concentrations at each site must not exceed 100 ppb.Note that the national 1-hour standard is in units of ppb.California standards are in units of ppm.To directly compare the national 1-hour standard to the California standards,the units can be converted from ppb to ppm.In this case,the national standard of 100 ppb is identical to 0.100 ppm. 9/On June 2,2010,a new 1-hour SO2 standard was established and the existing 24-hour and annual primary standards were revoked.To attain the 1-hour national standard,the 3-year average of the annual 99th percentile of the 1-hour daily maximum concentrations at each site must not exceed 75 ppb.The 1971 SO2 national standards(24-hour and annual)remain in effect until 1 year after an area is designated for the 2010 standard.However,in areas designated nonattainment for the 1971 standards,the 1971 standards remain in effect until implementation plans to attain or maintain the 2010 standards are approved. 10/The CARB has identified lead and vinyl chloride as"toxic air contaminants'with no threshold level of exposure for adverse health effects that are determined. These actions allow implementing control measures at levels below the ambient concentrations specified for these pollutants. 11/The national standard for lead was revised on October 15,2008,to a rolling 3-month average.The 1978 lead standard(1.5 pg/m3 as a quarterly average) remains in effect until 1 year after an area is designated for the 2008 standard.However,in areas designated nonattainment for the 1978 standard,the 1978 standard remains in effect until implementation plans to attain or maintain the 2008 standard are approved. 12/In 1989,the CARB converted both the general statewide 10-mile visibility standard and the Lake Tahoe 30-mile visibility standard to instrumental equivalents, which are"extinction of 0.23 per kilometer"and"extinction of 0.07 per kilometer"for the statewide and Lake Tahoe Air Basin standards,respectively. Valley Fever In 2019, AB 203 Safety Training on Valley Fever added Section 6709 to the Labor Code. This addition requires employers to provide effective Valley Fever awareness and prevention training for all construction employees at risk of prolonged exposure to dust in Fresno, Kern, Kings, Madera, Merced, Monterey, San Joaquin, San Luis Obispo, Santa Barbara, Tulare, and Ventura Counties. Said training must occur annually and again before an employee begins work that is reasonably anticipated to cause exposure to substantial dust disturbance. 4.3.2.3 Local Regulations San Joaquin Valley Air Pollution Control District The CARB coordinates and oversees both state and federal air pollution control programs in California and has divided the state into 15 air basins. Significant authority for air quality control within each basin has been given to local Air Pollution Control Districts or Air Quality Management Districts that regulate stationary source emissions and develop local nonattainment plans. The SJVAPCD is the regional agency responsible for the regulation and enforcement of federal, state, and local air pollution control regulations in the SJVAB. The SJVAPCD jurisdiction includes all of Merced, San Joaquin, Stanislaus, Madera, Fresno, Kings, and Tulare Counties and the western portion of Kern County. The SJVAPCD has developed plans to attain state and federal standards for ozone and particulate matter. The following attainment plans are currently in effect: Griffith Energy Storage Project 4.3-8 Tetra Tech/SCH 2022120675 Draft Environmental Impact Report August 2023