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ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised March 1998 <br /> . <br /> Water Level Measurements in Wells ., _.. ti. . 40 1v <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_ , r� ,E. r..r.. .. <br /> Organic Vapors. ; <br /> Photoionization Detector (PID). Calibration: daily field calibration using a isobutylene <br /> standard as per manufacturers instructions. <br /> Groundwater pH Measurement : . k a y <br /> Digital.pH meter. Calibration: s1 .tandard.pH solutions of 4, 7, and 10 will be utilized for <br /> daily field calibration according to manufacturers,instructions. ry <br /> Electrical Conductirt <br /> Electrical Conductivity meter. . Calibration: factory-calibrated.annually and periodically <br /> f: f, _ w <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 /> w Combustible gas/oxygen meter. °Calibration: factory calibrated, field calibrated monthly, <br /> zeroed daily according to manufacturers instructions. <br /> W:\Admin\ShelIs\QAQC-98.DOC <br /> 6 <br /> a <br />