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SEM FORM 1 <br /> SURFACE EMISSIONS MONITORING <br /> CALIBRATION AND PERTINENT DATA <br /> Date: 10-23-09 Site Name: Harney Lane <br /> Inspector(s): Mike Ricci Instrument:_SEM 500 <br /> WEATHER OBSERVATIONS <br /> Wind Speed: 3MPH Wind Direction: SE Barometric Pressure: 30.03"Hg <br /> Air Temperature: 52°F General Weather Conditions: Clear <br /> CALIBRATION INFORMATION <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: 500.0 ppm <br /> Trial Zero Air Reading Cal Gas Reading Cal Gas Conc.—Cal Gas Readin <br /> 1 0 500.0 480 <br /> 2 0 500.0 503 <br /> 3 0 500.0 499 <br /> Average Difference: 494 <br /> Calibration Precision = Average Difference/Cal Gas Conc. X 100% <br /> 494 / 500 X 100% <br /> 98 % <br /> Post-monitoring Calibration Check <br /> Zero Air Reading: –0—ppm Cal Gas Reading: _489–ppm <br /> BACKGROUND CONCENTRATION CHECKS <br /> Upwind Location Description: Reading:4.64ppm <br /> Downwind Location Description: Reading: 3.26ppm <br /> NOTES: <br />