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ATC Associates Inc. <br /> Qadity Assu aawelQiality Control Plan <br /> Revised March 1999 <br /> wank Vapors <br /> Photownization Detector (PID). Calibration: daily field calibration using a isobutyl ne <br /> standard as per manufacturers instructions. <br /> Groundwater pH Measurement <br /> Digital pH meter. Calibration: standard pH solutions of 4, 7, and 10 will be utilized for daily <br /> field calibration according to manufacturers instructions. <br /> Elecbrical Conductivity <br /> Electrical Conductivity meter. Calibration: factory-calibrated annually and periodically <br /> calibrated against laboratory prepared standard calibration solution. <br /> Water Temperature <br /> Mercury or digital thermometers. Calibration: factory calibrated once. <br /> CombushMe Gm/Oxygen <br /> Combustible gas/oxygen meter. Calibration: factory calibrated, field calibrated monthly, zeroed <br /> daily according to manufacturers instructions. <br /> Mbeeaneous Measuring Devices <br /> Calibration procedures for any other measuring device used will be documented at the request <br /> of the regulatory authority. <br /> w:wd \ShAs\QAQcr9s.noc <br />