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j kn KLEINFELDER <br /> File No. 20-3978-01.Wr6 <br /> 1 February 24, 1997 <br /> A-2.6 Soil Sample Selection for Laboratory Analysis <br /> The selection of soil samples for laboratory analysis is based upon: 1) the project objectives <br /> and requirements, 2) qualitative field screening performed in the field using the organic vapor <br /> detector, and 3) field observations such as lithology, odor, discoloration, or high moisture <br /> content. Generally, samples are submitted from the bottom of the boring and from soil <br /> horizons with significant potential for contamination as indicated by the organic vapor <br /> detector, observations, and site history. Samples may be collected from regular intervals <br /> when information on concentrations versus depth is desired. Samples that are not selected for <br /> laboratory analysis are held in sample control for possible future reference. When these <br /> samples are no longer needed, they are returned to the site and are combined with the soil <br /> cuttings generated during their collection. <br /> A-2.7 Soil Boring Closure and Soil Cutting Disposal <br /> Soil borings are closed immediately after the collection and logging of soil samples. Closure <br /> is accomplished by grouting the boring with a cement/bentonite slurry or as otherwise <br /> required. <br /> Drill cuttings will be placed in 55-gallon drums or wrapped in plastic and left on site for <br /> disposal by the site owner. If requested, Kleinfelder can coordinate disposal of soil and water <br /> with contractors after chemical analysis results are available. <br /> A-3 GROUNDWATER MONITORING <br /> A-3.1 Monitoring Well Construction <br /> Construction details for shallow ground water monitoring wells are as follows: <br /> • The well casing will be 2-inch inside diameter, flush threaded joint, schedule <br /> 40 PVC pipe. <br /> • The wells will be constructed in 8-inch diameter boreholes. <br /> Well screen sections are perforated with 0.010- or .02-inch factory-cut slots. <br /> This parameter is assessed (and modified if required) after the boring logs and, <br /> if warranted, a sieve test has been performed and the results received. <br /> 20-3978-01.WR6/207RE074.doc Page No.A-3 01997, Kleinfelder,Inc. <br />