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ENVIRONMENTAL AIR MONITORING <br />Perimeter Airborne Particulate <br />• Continuous air monitoring is conducted at two (2) locations for the determination of ambient <br />particulate radionuclide concentrations at the Schwartzwalder Mine. The air monitoring stations <br />were relocated during 2007 to enable assessment of data more representative of the current level <br />of activity at the Schwartzwalder Mine site and facilitate operational and maintenance efforts for <br />samplers. The current locations onsite, are station AS Main located near the southeastern <br />property boundary and station AS Creek located near the Ralston Creek are shown in Figure 0-1. <br />Quarterly concentrations, semiannual and annual averages for 2008 and 2009 are depicted in the <br />following Tables and Figures. <br />Table EA - 0 <br />Environmental Air Monitoring <br />Average Concentration <br />Class Y Na`U Wi/mb EC=9E-14 (90E-15) <br />Location Jan. - June 2008 Jul. - Dec 2008 Jan. - June 2009 <br />AS Creek 1.05E-16 3.65E-17 8.12E-17 <br />AS Main 1.06E-16 3.55E-17 5.36E-17 <br />QC Truck 1.23E-17 <br />Class W 230Th (uCi/ml)EC = 2E-14 (20E-15) <br />• <br />Location Jan. - June 2008 Jul. - Dec 2008 Jan. - June 2009 <br />AS Creek 8.24E-17 1.29E-17 2.35E-17 <br />AS Main 8.50E-17 1.39E-17 1.90E-17 <br />QC Truck 2.51E-17 <br />Class W 226Ra Wi/ml) EC = 9E-13 (900E-15) <br />Location Jan. - June 2008 Jul. - Dec 2008 Jan. - June 2009 <br />AS Creek 7.09E-17 3.14E-17 4.85E-17 <br />AS Main 4.43E-17 2.81E-17 3.91E-17 <br />QC Truck 2.57E-17 <br />Class D MOM (uCi/ml) EC = 6E-13 (60E-14) <br />Location Jan. - June 2008 Jul. - Dec 2008 Jan. - June 2009 <br />AS Creek 1.22E-14 1.70E-14 1.31E-14 <br />AS Main 1.80E-14 2.16E-14 1.39E-14 <br />QC Truck 1.84E-16 <br />Class y 232Th (uCi/ml)EC=4E-15(400E-17) <br />• <br />Location Jan. - June 2008 Jul. - Dec 2008 Jan. - June 2009 <br />AS Creek 1.93E-17 4.53E-18 1.10E-17 <br />AS Main 1.98E-17 5.36E-18 8.87E-18 <br />QC Truck 7.42E-18 <br />6