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4. ENVIRONMENTAL ANALYSIS <br /> 4.6 AIR QUALITY <br /> Exceedance of the CO standards is most likely to occur in winter months,when relatively low <br /> inversion levels trap pollutants near the ground and concentrate the CO. Background CO <br /> concentrations in the vicinity of the Project site do not approach the state standards even during <br /> TABLE 4.6-3 <br /> AIR QUALITY DATA SUMMARY (1997-2003)FOR THE PROJECT AREA <br /> Monitoring Data by Year <br /> Pollutant StandwAa 1997 1998 1999 2000 2001 2002 2003 <br /> t.. Cmrbon Monoxide` <br /> _. Highest 1 Hour Average(ppm)b 7.1 9.4 11.4 8.0 7.8 NA NA <br /> Days over State Standard 20 0 0 0 0 0 NA NA <br /> Days over National Standard 35 0 0 0 0 0 NA NA <br /> Highest 8 Hour Average(ppm)b 4.99 7.34 6.36 5.97 6.03 4.46 3.76 <br /> Days over National Standard 9.0 0 0 0 0 0 0 0 <br /> Ozone' <br /> Highest I Hour Average(ppm)b 0.119 0.116 0.132 0.122 0.114 0.107 0.103 <br /> Highest l Hour Average,ppm` <br /> Days over State Standard ExceedanceSd 0.09 5 14 16 7 4 11 5 <br /> Days over National Standard 0.12 0 0 1 0 0 0 0 <br /> Highest 8 Hour Average(ppm)b 0.099 0.094 0.113 0.094 0.086 0.096 0.089 <br /> Highest 8 Hour Average,ppm e <br /> Days over National Standard Exceedances 0.08 3 .5 10 3 1 3 2 <br /> Particulate Matter(PM10)` <br /> Highest 24 Hour Average(pg/m')b 119 125 132 112 158 83 NA <br /> r <br /> Highest 24 Hour Average, µg/m'e <br /> Days over State Standard Exceedances/ 50 12 11 27 18 12 4 NA <br /> Samplese <br /> Days over National Standard 1.50 0 0 0 0 1 0 NA <br /> Annual Average(pg/m')b 20 32.9 29.8 41.1 34.9 35.4 36.5 NA <br /> Annual average, pg/m'c <br /> Particulate Matter(PM2.5)' <br /> Highest 24 Hour Average(gg/m')b 65 NA NA 108 77 95 87 64 <br /> Highest 24 Hour Average, µg/m'e <br /> tr, Days over National Standard NA NA 11 5 3 3 0 <br /> Annual Average(pg/m')b 12 NA NA 24.9 18.7 15.6 18.7 19.0 <br /> Annual Average, µg/m'e <br /> a Generally,state standards are not to be exceeded and national standards are not to be exceeded more than once per year. <br /> b ppm=parts per million;ppb=pans per billion;µg/m'=micrograms per cubic meter.` Modesto-14a Street monitoring station. <br /> d Tracy-24371 Patterson Pass Road monitoring station. <br /> r <br /> NOTE:Values in bold are in excess of applicable standard. NA=Not Available. <br /> SOURCE: California Air Resources Board Summaries of Air Quality Data,1997,1998,1999,2000,2001,2002,2003. <br /> r <br /> RMC Peck Vernalis Quarry Mining and Reclamation emiert 4.6-15 ESA 1203015 <br /> Administrative Draft©R March 2004 <br />