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LANDFILL GAS MONITORING <br /> GEM 500 CALIBRATION AND PERTINENT DATA <br /> Date: Z/ � <br /> Site Name; <br /> Technician: Job No. <br /> WEATHER OBSERVATIONS <br /> Wind Speed: _ MPH Wind Direction: Barometric Pressure <br /> Air Temperature: <br /> __f / -F General Weather Conditions: 1<1411-( <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 /> prear.sion must be less than or equal to 2% of the calibration gas value. <br /> Instr-ument Serial No. - <br /> Calibration Gas: %CH4* 0,v %CO2 %02 <br /> Time 11-CH4 CO2 02 <br /> 3 - G <br /> Post-monitoring Calibration Check <br /> Time CH4 CO2, <br /> NOTES: <br />