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i <br /> ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised March 1998 <br /> l <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 /> Orzanic Vapors <br /> i <br /> Photoionization Detector (PID). Calibration: daily field calibration using a isobutylene <br /> standard as per manufacturers instructions. <br /> i <br /> Groundwater pH Measurement <br /> f <br /> DigitalpH meter. Calibration: standard pH solutions of 4, 7, and 10 will be utilized for <br /> daily field calibration according to manufacturers instructions. <br /> F <br /> Electrical Conductivi <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 manufacturers instructions. ' <br /> W:\Admin\SheIIs\QAQC-98.DOC <br /> b <br /> h <br />