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+ r <br /> HYDRIN <br /> ENVIRINNMENTAL <br /> TECNNOLOG ES,INC. <br /> 4.0 SUMMARY <br /> The results of the field activities and laboratory analyses of soil and ground water <br /> samples collected during this phase of investigation are discussed below• <br /> • Two two-inch diameter monitoring wells were installed on December 4, 1993 <br /> • Sediments encountered during this phase of drilling consisted primarily of silty <br /> sand overlying fine to medium grained sand with some lean clay and lean clay <br /> with sand <br /> • Neither TPHg nor BTEX was detected in concentrations exceeding the method <br /> detection lirruts in soil sample collected from bonngs MW-7 and MW-8 <br /> • Depth to ground water ranged from 17 22 to 18 85 feet below grade Ground water <br /> flows towards the northwest at an approximate gradient of 0 0006 ft/ft (0 06%) <br /> • TPHg was not detected in concentrations exceeding the method detection limits in <br /> ground water samples collected from monrtonng wells MW-4, MW-6, MW-7 and <br /> MW-8 TPHg concentrations ranged from 230 ppb in the ground water samples <br /> collected from MW-2 to 1,200 ppb in the ground water samples collected from <br /> . MW-1. Benzene was not detected in concentrations exceeding the method <br /> detection limits in ground water samples collected from monitoring wells MW-3, <br /> MW-4, MW-7 and MW-8 Benzene concentrations ranged from 16 ppb in the <br /> ground water sample collected from MW-6 to 95 ppb in the ground water sample <br /> from MW-1 <br /> I <br /> ! <br /> , r r <br /> ! <br /> I I I I <br /> r ! <br /> 5 <br />