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KLEINFFLDER `r A-2.6 Soil Sample Selection for Laboratory Analysis The selection of soil samples for laboratory analysis is based upon: 1) the project objectives and requirements, 2) qualitative field screening performed in the field using the organic vapor detector, and 3) field observations such as lithology, odor, discoloration, or high moisture content. Generally, samples are submitted from the bottom of the boring and from soil horizons with significant potential for contamination as indicated by the organic vapor detector, observations, and site history. Samples may be collected from regular intervals when information on concentrations versus depth is desired. Samples that are not selected for laboratory analysis are held in sample control for possible future reference. When these samples are no longer needed, they are returned to the site and are combined with the soil cuttings generated during their collection. A-2.7 Soil Boring Closure and Soil Cuttin2 Dis osal Soil borings are closed immediately after the collection and logging of soil samples. Closure is accomplished by grouting the boring with a cement/bentonite slurry or as otherwise required. Drill cuttings will be placed in 55-gallon drums or wrapped in plastic and left on site for disposal by the site owner. If requested, Kleinfelder can coordinate disposal of soil and water with contractors after chemical analysis results are available. +- A-3 GROUNDWATER MONITORING A-3.1 Monitorine Well Construction Construction details for shallow ground water monitoring wells are as follows: '-' • The well casing will be 2-inch inside diameter, flush threaded joint, schedule 40 PVC pipe. • The wells will be constructed in 8-inch diameter boreholes. • Well screen sections are perforated with 0.010- or .020-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. • The wells are generally screened from 5 feet above to 20 feet below first groundwater. The screen length is reduced if an aquitard with a minimum thickness of 5 feet is encountered. If an aquitard is encountered the well is usually terminated 1 to 2 feet into the aquitard. Effort is made not to screen across two aquifers. If confined aquifer conditions or high vadose zone contamination is encountered, the well screen is usually not set above the depth of first encountered ground water. Wells are usually not set in areas of suspected significant soil contamination. 20-4659-01.EOI/201 IR1442 Page A-3 °2001,Kleinfelder,Inc. November 28,2001 i..