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THE REMEDIATION GROUP, Inc 3.1 Temperature Measurement Temperature measurements will be collected with an electronic thermistor, which is an integral part of the pH meter, or a high quality thermometer A number of measurements will be made until a stable temperature reading is obtained 3.2 pH Measurement The pH measurement will be made as soon as possible after collection of the sample Calibration and measurements will be performed on site before sampling in accordance with the manufacturer's specifications as outlined in the Instruction Manual for the specific pH meter For measurement of natural waters, buffers of pH4, pH7, and pH10 will normally be used for instrument calibration In measuring polluted waters and some exceptional natural waters, very high and low range buffers may be needed for calibration Calibration will be performed using at least two buffer solutions The buffers must have pH values that bracket the pH of the sample (e g , between 7 and 10 or between 4 and 7) The temperature of the sample and the buffers should be about the same If necessary, this can be accomplished by immersing the buffer solutions in the water to be sampled until the buffers reach the same temperature as the water The electrode will be rinsed with distilled water before it is immersed in a buffer for calibration It will be washed with sample water and allowed to soak for about a minute before a measurement is performed All measurements are to be recorded on the field data sheets 3.3 Specific Conductance Measurement Conductivity will be measured by dipping the conductivity probe directly in the water source or into a sample The probe must be immersed about the vent If the instrument is not temperature compensating, the temperature of the sample (see Section 3 1) will be used to calculate specific conductance from the conductivity measurement Measurements shall be reported in units of micro-ohms per centimeter as 25 degrees Centigrade Calibrations and measurements will be performed on site, before sampling, in accordance with the manufacturer's specifications outlined in the Instruction Manual for the particular conductivity meter The conductivity meter will be periodically calibrated with standardized potassium chloride(KCL) solutions Batteries will also be checked frequently The conductivity probe will be checked periodically for signs of detenoration, and regenerated, replated or replaced as needed Probes can be stored wet or dry 4.0 DOCUMENTATION 4.1 Field Data Sheets Specially formatted field data sheets will be used to record the information collected dunng water quality sampling Field data sheets will be placed in the project file when sampling is completed protocol gw 5 16 July 1994