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Kennedy/Jenks Consultants <br /> Appendix E: Standard Operating Guidelines - <br /> Field Measurement of pH, Temperature, and <br /> Conductivity <br /> E.1 Introduction <br /> This guideline describes the procedure that will be used by Kennedy/Jenks Consultants personnel <br /> during performance of field pH, temperature, and electrical conductivity (EC) measurements. <br /> E.2 Equipment <br /> • Portable pH, temperature, and conductivity meter with potassium chloride (KCI) probe, <br /> temperature probe, and EC probe <br /> • Extra KCI filling solution <br /> • 50 ml plastic jar or other suitable container <br /> • Squirt bottle and supply of deionized (DI) water <br /> • pH 7, 10, and 4 buffer solutions <br /> • EC solutions <br /> E.3 Typical Procedures <br /> 1. Calibrate meter according to manufacturer's instructions. Prior to first measurement, check <br /> calibration against pH 7 buffer and again periodically over the course of the day, and recalibrate <br /> if the reading is more than 0.1 units from 7. <br /> 2. Use 50 ml plastic jar or other suitable containers for measurement readings. Rinse sample test <br /> container with sample water three times prior to measurement. <br /> 3. Immerse pH probe and temperature electrode in sample water. Gently stir sample for thorough <br /> mixing. Read and record pH to nearest 0.1 unit once pH reading has stabilized. Many pH <br /> meters possess an automatic feature which indicates final stabilized measurement. <br /> 4. Immerse the EC probe (if EC probe is not built into the same sonde as the pH probe) in the <br /> sample water. Repeat Step 3. <br /> 5. Rinse or bathe the probes with DI water or soak in DI water between measurements. Changing <br /> DI water bath between measurement stations increases accuracy of measurements. <br /> EA Instrument Calibration — General Procedure <br /> 1. Calibrate pH meter in the field at the beginning of each day of field work and when the standard <br /> check is out of calibration. <br /> 2. Rinse pH and temperature probes in DI water. <br /> Monitoring Well Installation Work Plan, E-1 <br /> Barrel Ten Quarter Circle Land Company, Escalon, California <br /> \\sfo\groups\is-group\ad mi n\job\03\030118.27_btgc1c\09-reports\mw-i nstall-wpMappen dix\app-e.doc <br />