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' ! DER <br /> content. <br /> Btl9UFple.FiOISdNnm. <br /> content. Generally, samples are submitted from the bottom of the boring and from soil horizons <br /> with significant potential for contamination as indicated by the organic vapor detector, <br /> ' observations, and site history. Samples may be collected from regular intervals when <br /> 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 is <br /> accomplished by grouting the boring with a cement/bentonite slurry or as otherwise required. <br /> Drill cuttings will be placed in 55-gallon drums or wrapped in plastic and left on site for disposal <br /> by the site owner. If requested, Kleinfeider can coordinate disposal of soil and water with <br /> 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 40 PVC <br /> pipe. <br /> ' • The wells will be constructed in 8-inch diameter boreholes. <br /> ' • Well screen sections are perforated with 0.010- or .020-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 /> ' . The wells are generally screened from 5 feet above to 20 feet below first <br /> groundwater. The screen length is reduced if an aquitard with a minimum thickness <br /> ' of 5 feet is encountered. If an aquitard is encountered the well is usually terminated <br /> 1 to 2 feet into the aquitard. Effort is made not to screen across two aquifers. If <br /> ' confined aquifer conditions or high vadose zone contamination is encountered, the <br /> 101486.6/SAC14R02453 Page A-3 July 25,2014 <br /> 0 2014 Kleinfelder <br />