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KLEINFELDER <br /> For the protection of the drilling crew, the PID is also used to measure the volatile <br /> concentrations in the breathing zone prior to and during the drilling of the samples Total <br /> ionizable hydrocarbon readings in excess of 5 ppmv will necessitate respiratory protection <br /> for the affected crew members A complete field health and safety plan is developed for the <br /> project prior to the start of field work. <br /> SOIL BORING CLOSURE <br /> Soil borings, not to be completed as ground water monitoring wells, are closed immediately <br /> after the collection and logging of the soil samples sTt.?AA <br /> Closure is by tremle grouting the boring with a cement/bentonite slurry or as otherwise <br /> required The closing of any soil boring often must be inspected by the a local health <br /> department official <br /> ' SOIL SAMPLE SELECTION FOR LABORATORY ANALYSIS <br /> The selection of soil samples for laboratory analysis is based upon 1) qualitative field <br /> screening performed in the field using the PID, 2) field observations such as odor, <br /> discoloration, or high moisture content, and 3) project requirements Generally, samples <br /> are submitted from the bottom of the boring and from soil horizons with significant <br /> potential for contamination as indicated by the PID, observations, and site history <br /> MONITORING WELL CONSTRUCTION <br /> Construction details for shallow ground water monitoring wells are as follows: <br /> ' o The well casing will be 2-inch or 4-inch inside diameter, flush-threaded joint, <br /> schedule 40 PVC pipe. <br /> o The wells will be constructed in 8- or 10-inch diameter boreholes. <br /> o Well screen sections areP erforated with 0 010-inch factory-cut slots. This <br /> parameter is assessed (and modified if required) after the boring logs and, if <br /> warranted, a sieve test has been performed and the results received <br /> ' 121-88-1108 <br />