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I <br /> J. H.`KLEINFELDER & ASSOeATES <br /> GEOTECHNICAL CONSULTANTS • MATERIALS TESTING <br /> Ids jI LAND & WATER RESOURCES <br /> r <br /> � ' 2825 EAST MYRTLE STREET <br /> STOC Z N,895205-4794 <br /> AUG r 1986 File: W-1038-1/14 : 398 <br /> August 5 , 1986 <br /> ENVIRIJFOE!�TAL HEALTH <br /> FERMII/SERVICES <br /> DESCRIPTION OF FIELD SAMPLING AT <br /> UNION CARBIDE FACILITY <br /> MANTECA, CALIFORNIA <br /> The following is a description of the procedures J.H. <br /> Kleinfelder & Associates should follow in sampling beneath an <br /> underground storage tank at the Union Carbide facility located in <br /> Manteca, California. <br /> Two soil borings will be drilled, one at each end of the <br /> underground tank at a 45-degree to a depth approximately 9 feet <br /> below the bottom of the underground storage tank. The two soil <br /> borings will be drilled using a truck-mounted drill rig using 6- <br /> inch hollow-stem augers, and will be drilled from a position <br /> outside the building. A diagram showing the position of the <br /> underground storage tank under the building, and the dimensions <br /> of the underground storage tank have been provided by the Cleint. <br /> This diagram will be used to position the drill rig in order to <br /> obtain a sample from each end of the underground storage tank. <br /> One sample will be collected from the termination of each <br /> boring using a modified California sampler equipped with three <br /> brass tubes. The slanted boring will be terminated at a point, <br /> located vertically 16 feet below ground surface and the sampler <br /> will be hydraulically driven into the soil. The sampler will be <br /> removed and the bottom (third) tube will be capped with aluminum <br /> foil and a tight-fitting plastic cap, labeled and placed in an <br /> iced cooler. A chain-of-custody sheet will be maintained to <br /> track sample possession until it is submitted to the analytical <br /> laboratory. Subsequent sample custody will be tracked by the <br /> laboratory. <br /> The soil in the middle or top tube will be extruded into a <br /> clean mason jar for equilibration and subsequent screening of the <br /> head space using a photoionization detector. JHK&A will utilize <br /> a photovac TIP which uses a 10.6ev lamp. This lamp should detect <br /> any aromatics used as a pesticide carrier, if present in the <br /> sample. Photovac screening is provided to allow early indication <br /> of possible sample contamination. <br /> To minimize cross-contamination of the samples, the flight <br /> augers and sampler will be steam-cleaned prior to each use. <br /> OTHER OFFICES: <br /> Walnut Creek • San Ramon • Sacramento • Fresno • Fairfield • Merced Rohnert Park • Los Angeles 0 Reno 6 Las Vegas • SL George,Utah 0 Denver <br />