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<br />Daub & Associates, Inc. Page 3-20 2015 NS Mine Plan Modification <br />1/5/2016 Section 3 General Site Conditions <br /> <br />Table 3-5. Background estimates of air pollution near Piceance Creek Basin <br />Pollutant Background <br />Estimates Data Source <br />PMI0 Annual Arithmetic <br />Mean <br />11 μg/m3 American Soda, Piceance 2003 - <br />2005. <br />PM10 24 Hour Second <br />Maximum <br />36 μg/m3 <br /> <br />SO2, Annual Mean .002 ppm Unocal, 1983 -1984. <br />SO2, 3 Hour Second <br />Maximum <br />.009 ppm <br />SO2, 24 Hour Second <br />Maximum <br />.005 ppm <br /> <br />N02 Annual Mean .005 ppm Encana, 2007 <br />N02 1 Hour 98th <br />Percentile <br />.010 ppm <br /> <br />CO 1 Hour Second <br />Maximum <br />1 ppm American Soda, Piceance 2003 - <br />2005. <br />CO 8 Hour Second <br />Maximum <br />1 ppm <br /> <br />Ozone 8 Hour Maximum .067 ppm Western Slope Ambient <br /> <br />PM2.5 3-Year Weighted <br />Avg. <br />7.9 μg/m3 Based on 650 South Avenue in <br />Grand Junction, 2012 <br />PM2.5 3-Year Avg. of 98th <br />Percentile <br />27.9 μg/m3 <br /> <br />Lead Maximum Quarterly <br />Mean <br />.002 μg/m3 Based on Denver Municipal Animal <br />Shelter, 2012. <br />Source: Colorado Department of Public Health and Environment <br />Table 3-5. Background estimates of air pollution near Piceance Creek Basin.