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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 /> 1 <br /> Groundwater nH Measurement i <br /> i <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 czdibration solution. <br /> Water Temperature <br /> Mercury or digital thermometers. Calibration: factory calibrated once. <br /> 11 <br /> Combustible Gas/O en <br /> I <br /> Combustible gas/oxygen meter: Calibration: factory calibrated, field calibrated monthly, zeroed i <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:1AdminlShellslQAQC-98.DOC <br />