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San Joaquin County Environmental Checklist national standard once. Data also indicate that CO concentrations did not approach state or federal standards. Concentrations of CO have declined in the SJVAB over the past 5 years because of existing regulations that require the use of oxygenated gasoline and because of the continued replacement of older vehicles with newer, lower-CO-emitting vehicles. If monitored pollutant concentrations meet state or federal standards over a designated period of time,the area is classified as being in attainment for that pollutant. If monitored pollutant concentrations violate the standards,the area is considered a nonattainment area for that pollutant. If data are insufficient to determine whether a pollutant is violating the standard,the area is designated unclassified. CARB has classified San Joaquin County as a severe nonattainment area for ozone and a nonattainment area for PM 10 and PM2.5. For CO,CARB has classified San Joaquin County as an attainment area. EPA has classified San Joaquin County as an extreme nonattainment area for the 1-hour ozone standard and a serious nonattainment area for the 8-hour ozone standard. For PMI O,EPA has classified the county as a serious nonattainment area. For CO,EPA has classified the county as an unclassified/attainment area, although the Stockton Urbanized Area is classified as a moderate(< 12.7 parts per million [ppm]) maintenance area(49 FR 20651,May 16, 1984). Table 2-3 summarizes the attainment status for the project area. Table 2-3. 2004 San Joaquin County Attainment Status for State and Federal Standards Pollutant State Federal 1-hour ozone Severe nonattainment Extreme nonattainment 8-hour ozone NA Serious nonattainment PM10 Nonattainment Serious nonattainment PM2.5 Nonattainment NA CO Attainment Unclassified/attainment' ' Stockton Urbanized Area(5/16/84,49 FR 20651)is a moderate(<12.7 ppm) maintenance area Pollutants of Concern Ozone is an eye,nose,throat,and respiratory irritant. As an oxidant, it increases susceptibility to respiratory infections. Ozone can cause substantial damage to vegetation through leaf discoloration and cell damage, and to other materials, such as synthetic rubber and textiles. Ozone is not emitted directly into the air but is formed by a photochemical reaction in the atmosphere. Ozone precursors, which include reactive organic gases(ROG)and oxides of nitrogen(NO,),react in the atmosphere in the presence of sunlight to form ozone. Because photochemical reaction rates depend on the intensity of ultraviolet light and air Notice of Preparation for the June 2006 North County Recycling Center and Sanitary Landfill 2-16 J8s os3o7.os Permit Revision