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SEM FORM 1 <br />SURFACE EMISSIONS MONITORING <br />CALIBRATION AND PERTINENT DATA <br />Date: 10-23-09 <br />Inspector(s): Mike Ricci <br />Site Name: Corral Hallow <br />Instrument: SEM 500 <br />Wind Speed: 6_MPH Wind Direction: NNW Barometric Pressure: 30.02_"Hg <br />Air Temperature: 80_°F General Weather Conditions: –SUNNY— <br />Pre-monitoring Calibration Precision Check <br />Procedure: Calibrate the instrument. Make a total of three measurements by alternating zero air <br />and the calibration gas. Record the readings and calculate the average algebraic difference <br />between the instrument reading and the calibration gas as a percentage. The calibration <br />precision must be less than or equal to 10% of the calibration gas value. <br />Instrument ID: 0532113803 Cal Gas Concentration: _500_ppm <br />Trial <br />Zero Air Readin <br />Cal Gas Reading <br />Cal Gas Conc. — Cal Gas Readin <br />1 <br />0 <br />500 <br />486 <br />2 <br />0 <br />500 <br />504 <br />3 <br />0 <br />500 <br />501 <br />Average Difference: <br />Calibration Precision = Average Difference/Cal Gas Conc. X 100% <br />= 497 / 500 X 100% <br />= 99 % <br />Post -monitoring Calibration Check <br />Zero Air Reading: _0_ppm Cal Gas Reading: _493_ppm <br />BACKGROUND CONCENTRATION CHECKS <br />Upwind Location Description: <br />Downwind Location Description: <br />497 <br />Reading: 6.12ppm <br />Reading: 6.87ppm <br />