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P <br /> ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised November 2002 <br /> Water Level Measurements in Wells <br /> Steel surveyors tape. Calibration: manufacturer supplied temperature correction will be <br /> applied as applicable for field conditions. Electrical well sounders. Calibration: check <br /> against steel surveyor's tape. <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 <br /> daily 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, <br /> zeroed daily according to manufacturer's instructions. <br /> w:\admin\shells\qaqc-02.doc <br /> 6 <br />