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CA ARNG Field Quality Assurance Project Plan site requiring PID monitoring. Calibration checks of each PID with standard calibration gas will be conducted in the field each morning prior to field work and after each field work day. Proper maintenance is necessary on a PID meter for the instrument to operate correctly.The battery will be checked periodically to ensure that it has a charge,the ultraviolet lamp and ion chamber will be kept clean, sand grains will be kept out of the air fan or pump, and the unit will be tested for leaks by plugging the inlet. 9.2.6 Flame Ionization Detector Flame ionization detectors can measure total concentrations of hydrocarbon vapors. The instruments are generally calibrated using methane in air,and the instrument response for each specific compound is proportional to its response factor relative to methane.The Century Systems Foxboro OVA(Models 88, 108, and 128) is the,most commonly used FID field instrument. It is recommended that field OVAs are factory-calibrated and serviced once per year. 9.2.7 Water Level Indicator and Interface Sensor The water level indicator and interface sensor will be calibrated before commencement of field activities by checking the markings on the tape against a metal measurement tape. Readings will be recorded to the nearest 0.01 foot.The battery and electrical connections on the water level indicator and the interface sensor will be periodically checked.The cable will be inspected for any breaks or bare wires. 9.2.8 Combustible Gas Indicator The CGI will be calibrated once a day with known mixtures of calibration gas. In addition, zero checks will be made on the CGI each time the meter is turned on.The unit will also be checked-for leaks by plugging the inlet. The condition of the battery will be checked regularly on the CGI.The operation of the alarm horn will be checked on a daily basis.The intake hose and nozzle will be kept clear so air samples can be taken into the instrument by the air pump. 9.2.9 Noise Dosimeter The noise dosimeter will be calibrated at the start of each day with a sound level calibrator designed by the manufacturer for the meter. At a minimum, the noise dosimeter will be returned to the manufacturer once a year for complete checkout and calibration. The battery level indicator on the noise dosimeter will be checked on a daily basis.The microphone and meter will be kept clean and dry. 9.2.10 Dust Monitor The dust monitor will be calibrated prior to each day's use to manufacturer's specifications. Specifications are based on a standard reference particle level.The calibration will be checked at the end of each day.The unit will be maintained by regularly checking the battery level indicator and cleaning the instrument accessories. 9.2.11 Geophysical Instruments Calibration and maintenance of the geophysical instruments will be conducted according to the geophysical contractor's standard operating procedures.The standard operating procedures will be supplied by the contractor for review and approval prior to mobilization. field QAPP.DOC 9-20 May 2000