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' RESNA Industries Inc <br /> Quality Assurance/Quality Control Plan <br /> Revised November 1992 <br /> 7.0 FIELD EQUIPMENT CALIBRATION AND MAINTENANCE <br /> The following measuring equipment may be used during the Remedial Investigation Equipment <br /> ' is grouped by field activity. Calibration procedures and frequency are listed by piece <br /> Soil Borings and WeII Dimensions <br /> Steel and coated cloth tape. Calibration none <br /> Water Level Measurements in Wells <br /> ' SteeI 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 /> 1bOrganic 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 /> iElectrical 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 /> QAQCIM ori. 5 <br />