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V � <br /> ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised March 1998 <br /> Organic Vapors <br /> Photoionization Detector (PID). Calibration: daily field calibration using a isobutylene <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 /> Electrical 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 /> Combustible Gas/Oxygen <br /> Combustible gas/oxygen meter. Calibration: factory calibrated, field calibrated monthly, zeroed <br /> daily according to manufacturers instructions. <br /> Miscellaneous Measuring Devices <br /> Calibration procedures for any other measuring device used will be documented at the request <br /> of the regulatory authority. <br /> W:\Admin\Shells\QAQC-98.DOC <br /> 6 <br />