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TREADWELL & ROLLO <br />• 2.7 Storage and Transportation <br /> Efforts will be made to store and transport supplies and samples safely Exposure to <br /> dust, direct sunlight, high temperature, and adverse weather conditions will be avoided <br /> whenever possible Samples will be transported to the water analysis laboratory as soon <br /> as possible and within the maximum holding time prescribed for the requested analysis <br /> Samples sent to the hazardous waste laboratory by common carrier will have proper <br /> hazardous-waste labelling affixed, if necessary <br /> 3.0 FIELD MEASUREMENTS <br /> The following field measurements will be performed on groundwater samples Data <br /> obtained from field water quality measurements will be recorded in the field log book or <br /> on data sheets Separate aliquots of groundwater from a monitoring well shall be used <br /> to make field measurements (samples for laboratory analysis shall not be reopened) <br /> 3.1 Temperature Measurement <br /> Temperature measurements will be collected with an electronic thermistor, which is an <br /> integral part of the pH meter, or a high quality thermometer All measurements will be <br /> recorded in degrees centigrade. A number of measurements will be made until a stable <br /> temperature is obtained <br /> 3.2 pH Measurement <br /> The pH measurement will be made as soon as possible after collection of the sample <br /> Calibration and measurements will be performed on site before sampling in accordance <br /> with the manufacturer's specifications as outlined in the Instruction Manual for the <br /> specific pH meter For measurement of natural waters, buffers of pH4, pH7, and pH10 <br /> will normally be used for instrument calibration. In measuring polluted waters and some <br /> exceptional natural waters, very high and low range buffers may be needed for <br /> calibration <br /> Calibration will be performed using at least two buffer solutions The buffers must have <br /> pH values that bracket the pH of the sample (e g , between 7 and 10 or between 4 and <br /> 7) The temperature of the sample and the buffers should be about the same If <br /> necessary, this can be accomplished by immersing the buffer solutions in water to be <br /> sampled until the buffers reach the same temperature as the water. The electrode will <br /> be rinsed with distilled water before it is immersed in a buffer for calibration. It will be <br /> washed with sample water and allowed to soak for a minute before a sample <br /> measurement is taken All measurements are to be recorded on the field data sheets <br /> 11070709 PJC A-5 1 April 1994 <br />