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Page 2 of 10 <br />SOP NUMBER 8.0 Field Parameter Measurements <br />Turbidity meter (portable turbidity meter). <br />Combination meters or flow-through cell meters may also be used. <br />5.0 FIELD PARAMETER MEASUREMENTS <br />Several of the parameters required to be measured are physically or chemically unstable and <br />must be tested either in situ or immediately after sample collection using a field test kit or <br />instrument. Examples of unstable parameters include pH, temperature, and dissolved oxygen. <br />Although the specific conductivity of a substance is relatively stable, it is recommended that this <br />characteristic be measured in the field. Most instruments measuring specific conductivity <br />require temperature compensation; therefore, the temperature of the samples should be measured <br />at the time the specific conductivity is measured. <br />Sampling personnel shall wear chemical-resistant gloves, which will be disposed of between <br />locations when performing field measurements. <br />5.1 PROCEDURES FOR COLLECTING SAMPLE FOR FIELD PARAMETER <br />MEASUREMENTS <br />Collect water samples for chemical analysis as described in SOP Nos. 1.0 and 26.0. Additional <br />sample (volume) will be collected and placed in a separate container (if not using an insitu <br />probe) for measuring field parameters. Field parameter measurements may be taken <br />immediately before or after sample collection depending on the type of sample collected. If <br />determining parameter stabilization during well development, samples for field parameter <br />measurements will be collected periodically. The sample container can be used to measure all <br />field parameters of the sample. After the measurements have been recorded, the water should be <br />discarded. Do not use this sample for chemical analysis. <br />5.2 METER USE AND CALIBRATION <br />Field instruments will be calibrated daily prior to commencement of field measurement <br />activities. Solutions used for standardizing and calibrating will be checked prior to field <br />mobilization to determine if the expiration dates have been exceeded. Any expired solution will <br />be discarded appropriately and replaced with a new solution. <br />5.2.1 pH Meter <br />The pH meter must be calibrated each day prior to well evacuation and water sample collection. <br />Calibration and operation of the pH meter should follow the manufacturer's specific instructions. <br />In general, calibration is done by adjusting the meter with standard buffers that bracket the <br />expected pH of the aqueous samples. For specific instructions refer to the manufacturer's <br />instruction manual. General calibration procedures for Powertech's on-site equipment are <br />provided in Attachment I (Calibration of Powertech Field Instruments). <br />Field sampling personnel will measure pH as follows: <br />Powertech <br />4/2312007 R Squared Inc <br />Rev SOP 8-1 JAB <br />8-2