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4.2 pH MEASUREMENT <br /> The pH measurement will be made with a combination field meter, generally within a few <br /> minutes before and after collection of the sample to be submitted for laboratory analysis. <br /> Calibration/standardization and field measurements will be performed in accordance with the <br /> equipment manufacturer's specifications as outlined in the instruction manual for the specific pH <br /> meter used. Two of the following buffers of pH-4, pH-7, and pH-10, which most closely <br /> bracket the anticipated range of groundwater conditions, will be used for instrument calibration. <br /> 4.3 SPECIFIC ELECTRICAL CONDUCTANCE MEASUREMENT <br /> Specific electrical conductance will be measured by immersing the conductivity probe directly <br /> in the water source or into a sample. The probes automatically compensate for the temperature <br /> of the sample. Measurements will be reported in units of micromhos per centimeter at 25° <br /> Celsius. <br /> Calibration/standardization and field measurements will be performed in accordance with the <br /> equipment manufacturer's specifications as outlined in the instruction manual for the specific <br /> conductivity meter used. The conductivity meter will be periodically calibrated with <br /> standardized potassium chloride (KCI) solutions. <br /> 5.0 DOCUMENTATION <br /> 5.1 SAMPLE CONTROL BOOK <br /> A sample control book containing information collected during sampling operations, as described - <br /> above, will be maintained. This will consist of a ring-bound notebook with pages numbered <br /> consecutively. Entries in the sample control book will be made with indelible ink. Errata will <br /> be marked out with a single line. <br /> Specially formatted field data sheets will be used to record the information collected during <br /> water quality sampling. Following completion of sampling and review by the project manager <br /> or task leader, the log book and data sheets will be placed in the project file. <br /> 5.2 CHAIN-OF-CUSTODY PROCEDURES - <br /> After samples have been collected and labeled, they will be maintained under chain-of-custody <br /> procedures. These procedures document the transfer of custody of samples from the field to a <br /> designated laboratory. <br /> D - 4 p;198I MPROTOCOL.WPN <br />