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4. ENVIRONMENTAL ANALYSIS 4.6 AM QUM= Title V Federal Operating Permit(Title V) Title V of the 1990 CAA Amendments requires all major sources and some minor sources of air pollution to obtain an operating permit. A Title V permit grants a source permission to operate. The permit includes all air pollution requirements that apply to the source, including emissions — limits and monitoring,record keeping, and reporting requirements. It also requires that the source report its compliance status with respect to permit conditions to the permitting authority. Under Title V of the CAA, any source that emits or has the potential to emit 100 tons per year or more of any criteria air pollutant is a major source and must obtain a Title V operating permit. Asbestos Toxic Air Control Measure On July 22 of 2002,the CARB adopted a new Asbestos Airborne Toxic Control Measure for construction,grading,quarrying,and surface mining operations. New emission control measures, such as dust suppressants,will apply to activities such as road construction and road maintenance, construction,grading,and quarrying and surface mining operations in areas with naturally- occurring asbestos/serpentine rock. Existing Air Quality Conditions A regional air quality monitoring network provides information on ambient concentrations of criteria air pollutants. Monitored ambient air pollutant concentrations reflect the number and strength of emissions sources and the influence of topographical and meteorological factors. Table 4.6-3 presents a seven-year summary of air pollutant data collected at the two representative monitoring stations nearest the Project Area; one in Modesto on 14'h Street and one _ in Tracy,as well as the applicable State and Federal ambient air quality standards. The Modesto station,approximately 20 miles from the Proposed Project,measures concentrations of all criteria air pollutants. The Tracy station,approximately 15 miles from the Proposed Project,measures _ ozone concentrations only. The analysis used ozone background from the Tracy station and other air pollutant data from the Modesto station. Pollutant concentrations measured at these stations are representative of background air pollutant concentrations for the Project Area. — The number of days during which ozone concentrations violated the state standard is noticeably lower since 1999, when it peaked. Based on the data from 1997 through 2002,ozone — concentrations violate the state ozone standard an average of 9 days per year. Major sources of ROG emissions (a precursor to ozone formation) in the San Joaquin Valley are mobile sources, solvents, and oil and gas production. On-road motor vehicles and fuel combustion account for — roughly 34 and 70 percent of the San Joaquin Valley's total ROG and NOx emissions, respectively(CARB, 2003). Table 4.6-3 indicates that background PM 10 and ozone concentrations have exceeded state standards in each year between 1997 and 2002. Major sources of PM10 in the region include motor vehicles,power generation,industrial processes,wood burning,construction and farming activities(CARB, 2003). Fugitive windblown dust also represents a significant source of airborne dust. RMC Pacific Vernalis Quany Muting and Reclamation Project 4.6-14 FSA/203015 Adtnmishative DrnR Eat Mash 2004