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HYDRO <br /> L ENVI NTAL <br /> TECH Umn,INC. <br /> 4.0 RESULTS OF INVESTIGATION <br /> 4.1 Results of Soil and Ground Water Sample Analysis <br /> The following metals were detected in varying concentrations in the soil samples: <br /> arsenic, mercury, barium, chromium, cobalt, copper, lead, nickel, vanadium and <br /> zinc. The following metals were detected in varying concentrations in the ground <br /> water samples: arsenic, barium, cobalt, mercury and nickel. Additionally, di-n- <br /> butylphthalate was detected in soil samples in concentrations ranging from 0.0 ppm <br /> to 640 ppm. Zinc and di-n-butylphthalate were also detected in the method blank <br /> samples analyzed as part of laboratory quality control. With the exception of a 5 <br /> ppm OVM reading from a sample collected from boring MW-4, no detectable <br /> concentrations of organic vapors were measured in the. field. A summary of <br /> analytical results for samples collected from soil borings is presented in Table 1 and <br /> foround water in Table 2. Copies of the laboratory reports and chains of custody <br /> �' P Y re. P Y <br /> are attached in Appendix F. OVM readings are recorded on geologic well logs <br /> presented in Appendix C. <br /> 4.2 Ground Water Gradient <br /> On July 26, 1993, depth to ground water in each of the wells measured ranged from . <br /> 11.21 to 31.96 feet below grade. The depth to water measurements and well-head <br /> elevation data were used to calculate ground water elevationcontours. <br /> These <br /> contours are shown on Figure 3, the Ground Water Contour Map. Figure 3 shows <br /> ground water flow to be.southerly ata variable gradient of 0.5% to 1.0%. <br /> 6 <br /> I <br />