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' - GEOMATRIX <br /> 3.0 FIELD MEASUREMENTS <br /> ' Field measurements of temperature, pH, and SEC will be performed on aliquots of <br /> ' groundwater that will not be submitted for laboratory analysis. Field water quality <br /> measurements and instrument calibration details will be recorded on the WELL SAMPLING <br /> ' A_Ni D/OR 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 <br /> and pH-7, or pH-7 and pH-10, whichever most closely bracket the anticipated range of <br /> ' groundwater 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 (,uS) per square centimeter <br /> (equivalent to micromhos or µmhos) at 25 degrees Celsius. <br /> The SEC meter will be calibrated at the beginning and once during each sampling day in <br /> SAMPLING OF GROUNDWATER MONITORING WELLS <br /> AND WATER SUPPLY WELLS Pate b of 10 <br /> ' %ISC PROTO-',IW TXT REVISION DATE.MARCH 1996 L/lw_16 <br />