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LANDFILL GAS MONITORING <br /> GEM 500 CALIBRATION AND PERTINENT DATA <br /> Date: 112,1/66Site Name: <br /> Technician: Job No, 0,7:a <br /> WEATHER OBSERVATIONS <br /> Wind Speed: MPH Wind Direction: Barometric Pressure:.3�Z/3"Hg <br /> Air Temperature: 5-!-/0'F General Weather Conditions: <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 ape rcentage. The calibration <br /> precision must be less than or equal to 2% of the calibration gas value. <br /> Instrument Serial No. <br /> Calibration Gas: %CH4 %CO2 3! % _ <br /> Time CH4 CO2 02 <br /> Post-monitoring Calibration Check <br /> 'time 02 <br /> 1200 ��CH4����CO2 <br /> NOTES: <br />