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GEOMATRIX <br /> instrument calibration details will be recorded on the WELL SAMPLING AND/OR <br /> DEVELOPMENT RECORD. <br /> 3.1 TEMPERATURE MEASUREMENTS <br /> Temperature measurements will be made with a mercury-filled thermometer or an electronic <br /> thermistor,and all measurements will be recorded in degrees Celsius. <br /> 3.2 PH MEASUREMENT <br /> The pH measurement will be made as soon as possible after collection of the sample, generally <br /> within a few minutes. The pH will be measured by immersing the pH probe into an aliquot of <br /> groundwater. <br /> The pH meter will be calibrated at the beginning of and once during each sampling day and <br /> whenever appropriate, in accordance with the equipment manufacturer's specifications, as <br /> outlined in the instruction manual for the specific pH meter used. Two buffers (either pH-4 and <br /> pH-7,or pH-7 and pH-10,whichever most closely bracket the anticipated range of groundwater <br /> conditions)will be used for instrument calibration. <br /> 3.3 SPECIFIC ELECTRICAL CONDUCTANCE MEASUREMENT <br /> SEC will be measured by immersing the conductivity probe into an aliquot of groundwater. <br /> The probes used should automatically compensate for the temperature of the sample. <br /> Measurements will be reported in units of micro-Siemens((DS)per square centimeter <br /> (equivalent to micromhos or(Dmhos)at 25 degrees Celsius. <br /> The SEC meter will be calibrated at the beginning and once during each sampling day in <br /> accordance with the equipment manufacturer's specifications, as outlined in the instruction <br /> manual for the SEC meter used. The SEC meter will be calibrated with the available <br /> standardized potassium chloride(KCl)solution that is closest to the SEC expected in <br /> groundwater below the site. <br /> 4.0 DOCUMENTATION <br /> 4.1 FIELD DATA SHEETS <br /> A DAILY FIELD RECORD will be completed for each day of fieldwork. A WELL <br /> SAMPLING AND/OR DEVELOPMENT RECORD will be used for each well to record the <br /> 1ADoc Safe\PROTOCOL\PROTO-MW.doc SAMPLING OF GROUNDWATER MONITORING WELLS AND WATER SUPPLY WELL6 <br /> Page 6 of 9 <br /> Revision Date: March 1996 <br />