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TERRA VAC <br /> Prior to each use the soil sampler was cleaned using an Alconox wash and rinsed with potable <br /> water. Upon the completion of each well, auger flights, the auger bit, and other pieces of <br /> intrusive equipment were steam cleaned to prevent cross contamination between borings. <br /> Rinsate generated during the decontamination of drilling equipment was stored in DOT approved <br /> M 55 gallon drums pending proper disposal. <br /> M3.0 ANALYTICAL RESULTS <br /> r <br /> Select soil samples collected during drilling were submitted for analytical testing. Upon return <br /> of the split-spoon, the selected brass sleeves were capped, labeled and stored on ice. A chain <br /> of custody form was initiated by the sampling personnel and completed during subsequent <br /> handling of the samples. Analytical testing was conducted by Sequoia Analytical (Sequoia) <br /> Laboratories, a State of California certified laboratory, of Redwood City, California. Soil <br /> samples were analyzed using EPA method 8020 for Total Petroleum Hydrocarbons as gasoline <br /> (TPH-g) and EPA method 8015 for benzene, toluene, ethylbenzene and xylenes (BTEX). <br /> Laboratory analytical results of analyses are included in.Appendix B. A summary of these <br /> results is presented in Table 1. <br /> 4.0 CONCLUSIONS <br /> Lithology at the site is characterized by a plastic clay which over lays a silty sand unit. The silty <br /> sand unit appears to be laterally continuous across the site. Thin lenses of less permeable soils <br /> were observed at varying depths. <br /> The results of field screening of soil samples from borings MW-8 and MW-9 indicated <br /> detectable hydrocarbon concentrations in MW-8 only. This was subsequently confirmed by <br /> laboratory analysis. Impacted soil proximal to MW-8 was reported to exist from approximately <br /> 9 to 20 feet below grade. <br /> Pr,jxt No.30-0212 <br /> April 3,1995 <br />