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City of Santa Ana Environmental Checklist <br />Existing Pollutant Levels <br />The SCAQMD has divided the Basin into air monitoring areas and maintains a network of air quality <br />monitoring stations throughout the Basin. The project site is located in the Central Orange County <br />Area (i.e., Source Receptor Area [SRA) Number 17). The nearest monitoring station is in the City of <br />Santa Ana, located approximately 5 miles northwest of the project location. The Anaheim - Pampas <br />monitoring station in the City of Anaheim monitors the following criteria pollutants: carbon <br />monoxide (CO), 03, nitrogen dioxide (NO2), sulfur dioxide (S02), and particulate matter less than or <br />equal to 10 or 2.5 micrometers in diameter (PM10 and PM2.5, respectively). The most recent data <br />available covers 2008 to 2010. <br />Monitoring data (Table 3 -1) show the following pollutant trends: state 1 -hour 03 standards were <br />exceeded three times during the 3 -year reporting period. The national 8 -hour 03 standard was <br />exceeded a total of six times during the 3 -year period. CO and NO2 concentrations are low and no <br />exceedances were recorded during the 3 -year reporting period. Particulate (PM10 and PM2.5) <br />concentrations are largely affected by meteorology and show some variability during the 3 -year <br />reporting period. The state 24 -hour PM10 standard was exceeded three times in 2008 and once in <br />2009. The national PM23 standard was exceeded five times in both 2008 and 2009, and not once in <br />2010. <br />Table 3 -1. Air Quality Data from Costa Mesa Station (ARB 30195) and Anaheim - Pampas Lane <br />Station (ARB 30178) <br />Pollutant Standards <br />2008 <br />2009 <br />2010 <br />Ozone (03) <br />State Standard (1- HourAverage = 0.09 ppm) <br />National Standard (8- HourAverage = 0.07S ppm) <br />Maximum Concentration 1 -Hour Period <br />0.105 <br />0.093 <br />0.104 <br />(ppm) <br />Maximum Concentration 8 -Hour Period <br />0.086 <br />0.077 <br />0.088 <br />(ppm) <br />Days State 1 -Hour Standard Exceeded <br />2 <br />0 <br />1 <br />Days National 8 -Hour Standard Exceeded <br />S <br />1 <br />1 <br />Carbon Monoxide (CO) <br />State Standard (8-Hour Average = 9 ppm) <br />National Standard (8-Hour Average = 9 ppm) <br />Maximum Concentration 8 -Hour Period 3.44 2.73 1.98 <br />Win) <br />Days State /National 8 -Hour Standard 0 0 0 <br />Exceeded <br />Nitrogen Dioxide (NO2) <br />State Standard (1 -Hour Average= 0.18 ppm) <br />Maximum 1 -Hour Concentration 0.081 0.065 0.070 <br />Days State Standard Exceeded 0 0 0 <br />Suspended Particulates (PM10) <br />State Standard (24- HourAverage = 50 pg /m3) <br />National Standard (24-Hour Average =150 pg/ne) <br />The Academy Charter High School <br />Initial study /Mitigated Negative Declaration 3 -15 <br />•11 <br />June 2012 <br />ICF 00914.11 <br />