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� r <br /> HYDRO <br /> ENVIRONMENTAL <br /> TECHNOLOGIES,INC. <br /> displayed graphically on the Hydrocarbon Concentration Map (Figure 4) A copy of <br /> the laboratory reports and chain-of-custody forms are attached in Appendix E <br /> 4.0 SUMMARY <br /> The results of the field activities and laboratory analysis of soil and ground water <br /> samples collected during this phase of investigation are discussed below <br /> • Three two-inch diameter monitoring wells were installed on December 1, 2, <br /> and 3, 1993 <br /> • Sediments encountered during drilling consisted primarily of lean clay, with <br /> some fat clay, sandy clay, clayey sand, fine to medium grained sand and silty sand. <br /> • Neither TPHg nor BTEX was detected in concentrations exceeding the method <br /> detection limits in soil sample collected from borings MW-6, MW-7 and MW-8 <br /> • Depth to ground water ranged from 73 51 to 74 09 feet below grade Ground water <br /> flows towards the southwest at an approximate gradient of 0 0013 ft/ft (0 13%) <br /> • TPHg was not detected in concentrations exceeding the method detection limits in <br /> ground water samples collected from monitoring wells MW-1, MW-5, MW-6 and <br /> MW-8. TPHg concentrations ranged from 59 ppb in the ground water samples <br /> collected from both MW-4 and MW-7 to 550 ppb in the ground water samples <br /> collected from MW-3 Benzene was not detected in concentrations exceeding the <br /> method detection limas in ground water samples collected from monitoring <br /> wells MW-1, MW-6, MW-7 and MW-8 Benzene concentrations ranged from 1 1 <br /> ppb in the ground water sample collected from MW-5 to 270 ppb in the ground <br /> water sample from MW-3 <br /> is <br /> 5 <br />