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LANDFILL GAS MONITORING <br /> GEM 500 CALIBRATION AND PERTINENT DATA <br /> Date: Site Name: <br /> Technician: /-` rt Job No. <br /> WEATHER OBSERVATIONS <br /> Wind Speed: r MPH Wind Direction: _ Barometric Pressure: 4??'Hg <br /> Air Temperature: °F General Weather Conditions: <br /> CALIBRATION INFORMATION <br /> Pre-monitoring Calibration Precision Check <br /> Procedure,, Calibrate the instrument. Make a total of three measurFments by alternating zero air, <br /> and the calibratlon 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 of equal to 2% of the calibration gas value. <br /> Instrument Serial No. <br /> Calibration Gas: %CH4�0-0 %CO2rz � %02 <br /> Time CH4 CO2 02 <br /> 0 s- <br /> Post-monitorinq Calibration Check <br /> Time CH4 CO2 02 <br /> 5 <br /> NOTES: <br />