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k'l KLE1NFELDER After the samples are collected they are individually labeled The label includes Kleinfelder's name, job number, the date and time the sample was collected, the employee number of the individual who performed the sampling, and a unique five-digit sample identification number 23 Selection of Soil Samples for Laboratory Analysts The selection of soil samples for laboratory analysts is based upon 1) the project objectives and requirements, 2) qualitative field screening performed in the field using the FID, 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 potential for contamination as indicated by the organic vapor detector, observations, and site history To estimate the vertical extent of potential contamination, soil samples will be screened using a FID If the results of the field screening indicate measurable concentrations of volatile compounds, drilling will continue until the FID readings do not indicate potential contamination It is estimated that 3 to 5 soil samples per boring will be submitted for chemical analyses based on the above screening criteria The soil borings will be 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 3 0 LABORATORY ANALYSES The soil samples will be analyzed as follows • TPH-Extractable as Diesel (by EPA Method 8015M) • TPH as Kerosene (by EPA Method 8015M) • TPH-Purgeable as Gasoline (by EPA Method 8015M) • Benzene, Toluene, Ethylbenzene and Total Xylenes (BTEX) by EPA Method 8020 Samples will be submitted under chain of custody procedures to Sequoia Analytical in Sacramento on a normal turnaround basis, typically requiring 10-15 working days for completion Sequoia is certified by the State of California Department of Health Services to perform the requested analyses 40-Y P9I 79/401 OP0I9 4 Copyright 2000 Kleintelder Inc