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J. H. KLEINFELDER &ASSOCIATES 7 SOIL CF1FMICAI. ASSESSMENT To assess the presence of petroleum hydrocarbons in the unsaturated soils (vadose zone), soil samples were collected for chemical analysis from several soil borings drilled on the project property. The locations of these soil borings are identified as R-1 through A-19 and are shown on the monitoring well and boring location map (Figure 2). Available laboratory data (soils and ground water) including me:�hods of analysis and detection limits are included within Appendix E. t, A truck-mounted drill rig equipped with 8-inch hollow stem augers was used F(, to reach the desired sampling depths. Soil samples were collected by advancing a soil boring to a point immediately above the desired sampling depth and then driving a Modified California Sampler lined with three brass tubes into the undisturbed sail. The sampler was then removed from the bottom of the boring. A portion of the sample from the selected depth was properly preserved, sealed, labeled, and placed inside an iced cooler. At the end of drilling operations, the selected samples (Table 2), were delivered under chain-of-custody at a temperature of 40C, to the laboratory. All remaining (non--submitted) samples were retained in refrigerated storage for future reference or analysis. To minimize the potential for cross-contamination between soil borings, all augers and associated equipment were steam cleaned prior to the drilling of each soil borings. The sampling equipment was cleaned with a phosphate-free detergent scrub and a distilled water rinse prior to the collection of each soil sample. Following the drilling and collection of " soil samples at each soil boring location, the borehole was completely grouted from the bottom to the top using tremie rods and a slurry of portland cement and 4 percent bentonite gel. 53-87-443 19