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KLEiNFELDER I E V For the protection of the drilling crew, the PID is also .used to measure the volatile concentrations in the breathing zone prior to and during the drilling of the samples. Total ionizable hydrocarbon readings in excess of S ppmv will necessitate respiratory protection for the affected crew members A complete field health and safety plan is developed for the project prior to the start of field work. SOIL BORING CLOSURE r Soil borings, not to be completed as ground water monitoring welts, are closed immediately E i.Q after the collection and logging of the soil samples. Closure is by tremie grouting the boring with a cement/bentonite slurry or as otherwise ' required. The closing of any soil boring often must be inspected by the a local health department official. SOIL SAMPLE SELECTION FOR LABORATORY ANALYSIS The selection of soil samples for laboratory analysis is based upon: 1) qualitative field screening performed in the field using the PID, 2) field observations such as odor, discoloration, or high moisture content, and 3) project requirements. Generally, samples are submitted from the bottom of the boring and from soil horizons with significant potential for contamination as indicated by the PID, observations, and site history. MONITORING WELL CONSTRUCTION Construction details for shallowround water monitoring wells are as follows: g o The well casing will be 2-inch or 4-inch inside diameter, flush-threaded joint, H schedule 40 PVC pipe. r o The wells will be constructed in 8- or 10-inch diameter boreholes. i o Well screen sections are perforated with 0,010-inch factory-cut slots. This parameter is assessed (and modified if required) after the boring logs and, if warranted, a sieve test has been performed and the results received. J ' 121-88-1108 1