Laserfiche WebLink
5.1 AIR QUALITY <br /> 10.00 <br /> 9.00 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ <br /> 8.00 <br /> 7.00 <br /> O <br /> 6.00 <br /> L <br /> Q. 5.00 <br /> to <br /> L <br /> Q.4.00 <br /> U 3.00 <br /> 2.00 <br /> ♦ Max 8-Hour Concentration <br /> 1.00 3-Year Average <br /> Federal&California Standard <br /> 0.00 <br /> 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 <br /> Calendar Year <br /> FIGURE 5.1-6 <br /> Maximum 8-hour Average CO Level: Stockton-Hazelton: 1995-2007 <br /> 5.1.1.3.6 Sulfur Dioxide <br /> SO2 is produced when any sulfur-containing fuel is burned. It is also emitted by chemical <br /> plants that treat or refine sulfur or sulfur-containing chemicals. Natural gas contains <br /> negligible sulfur,while fuel oils contain much larger amounts. Because of the complexity of <br /> the chemical reactions that convert SO2 to other compounds (such as sulfates),peak <br /> concentrations of SO2 occur at different times of the year in different parts of California, <br /> depending on local fuel characteristics,weather,and topography. The San Joaquin Valley Air <br /> Basin is considered to be in attainment for SO2 for purposes of state and federal air quality <br /> planning. <br /> Table 5.1-6 presents the state and federal air quality standards for SO2 and the maximum <br /> levels recorded at Bethel Island Road (the nearest SO2 monitoring station) from 1998 through <br /> 2007. Maximum 1-hour average and 24-hour average readings have been an order of <br /> magnitude below the state standard. The federal annual average standard is 0.03 ppm; <br /> during most of the period shown,annual average S02 levels at this site have been less than <br /> one-tenth of the federal standard.Figure 5.1-7 shows that for several years the maximum SO2 <br /> levels generally have been less than one-fourth of the state standard. <br /> SAC/371322/082410013(LEC_5.1_AIR_QUALITY.DOC) 5.1-13 <br />