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j in the vicinity of the former tanks. Laboratory results 'are summarized in Tables 1 and 2, <br />respectively. <br />The results of the September 1995 investigation were transmitted to PHS/EHD in a letter report <br />a' prepared by Ground Zero dated September 19, 1995. <br />i 3.2 June 1996 Investigation <br />3.2.1 Field Activities <br />On June 14, 1996, Ground Zero supervised the drilling of ]five soil borings (SB4 through SB8) <br />and two groundwater monitoring wells (MW 1 and MW2) t the locations shown on Figure 2. <br />Drilling was performed by V&W Drilling (C57-710678) of Rio Vista, California. Soil samples <br />were collected at 5 foot intervals for logging purposes. Boring logs are included in Appendix <br />C. t <br />Borings SB5 through SB7 were drilled to depths ranging! from 19 to 25 feet below ground <br />�= surface (bgs). Groundwater was first encountered at depths between 16 and 24 feet bgs. Soil <br />samples were collected from the capillary fringe zone at approximately 16 feet for laboratory <br />analysis. Soil boring SB8 was advanced in the approximate center of the former excavation to <br />L�I <br />a depth of 45 feet bgs. No petroleum hydrocarbon odors were noted during drilling until a depth <br />of approximately 20 feet bgs. Soil samples were collected from boring SB8 at depths of <br />approximately 251/2, 41, and 451/2 feet bgs to determine the (vertical extent of soil contamination <br />and at depths of 25 and 36 feet bgs for physical and biological analyses. No soil samples were <br />collected from soil boringSB4 for chemical analysis. Bori> logs are included y „g g c uded in Appendix C. <br />I <br />Subsequent to soil sampling, Hydropunch groundwater samples were collected from borings SB5 <br />through SB8. The water samples were collected using dedicated disposable bailers and <br />transferred into appropriate containers supplied by the laboratory. <br />gmundw\mnuioklosure 5 <br />P---, <br />