Laserfiche WebLink
1 <br /> 4.2P H 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 pH4, 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 MIEASURFAIENT ' <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 mxcromhos 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 /> 17 - 4 D 1981171PROToco1.werf <br />