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TREADWELL & ROLLO <br />• 3.3 Specific Conductance Measurement <br /> Conductivity will be measured by dipping the conductivity probe directly in the water <br /> source or into a sample. The probe must be immersed above the vent. If the instrument <br /> is not temperature compensating, the temperature of the sample (see Section 3 1) will be <br /> used to calculate specific conductance from the conductivity measurement. <br /> Measurements shall be reported in units of micromhos per centimeter at 25 degrees <br /> Centigrade <br /> Calibrations and measurements will be performed on site, before sampling, in <br /> accordance with the manufacturer's specifications outlined in the Instruction Manual for <br /> the particular conductivity meter The conductivity meter will be periodically calibrated <br /> with standardized potassium chloride (KCl) solutions Batteries will also be checked <br /> frequently The conductivity probe will be checked periodically for signs of <br /> deterioration, and regenerated, replated or replaced as needed Probes can be stored <br /> wet or dry <br /> 4.0 DOCUMENTATION <br /> 4.1 Field Data Sheets <br /> Specially formatted field data sheets will be used to record the information collected <br /> during water quality sampling Field data sheets will be placed in the project file when <br /> sampling is completed <br /> 4.2 Chain-of-Custody Procedures <br /> After samples have been collected and labelled, they will be maintained under <br /> chain-of-custody procedures These procedures document the transfer of custody of <br /> samples from the field to a designated laboratory <br /> A Chain-of-Custody Record will be filled out for each shipment of samples to be sent to <br /> the laboratory for analysis (Figure 4-1) Information contained on the form shall <br /> include <br /> o date and time the sample was taken <br /> o sample number and the number of sample containers <br /> o analyses required <br /> o remarks including preservatives added and any special conditions <br /> o name of Treadwell & Rollo, Inc representative who will receive results <br /> o turnaround time for sample analyses (standard, rush, etc) <br /> I <br /> A-6 <br /> 1070709 PJC 1 April 1994 <br />