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i <br /> �4l <br /> 5.0 DISCUSSION OF RESULTS <br /> The following are the results of field activities and laboratory analysis of soil and <br /> groundwater samples collected during this supplemental site investigation: <br /> • Near-saturated soil conditions were encountered at approximately 10 feet below grade <br /> during drilling, with the depth to groundwater measured in the monitoring wells <br /> during sampling at approximately 15 feet below grade. <br /> • Analysis of soil samples collected from Borings MW-6 and MW-7 at 6 feet below <br /> grade did not detect TPH-G or BTEX above the reported detection limit. <br /> 40 Free product or sheen was not observed in any of the monitoring wells. <br /> • Groundwater elevation data as measured on September 15, 1993 indicate a gradient of <br /> approximately 0.0006 foot per foot in a southeasterly direction across the site. <br /> • Dissolved-phase petroleum hydrocarbon compounds were detected at concentrations <br /> ranging from 400 to 38,000 ppb TPH-G and 2.4 to 770 ppb benzene in groundwater <br /> is samples collected from MW-2, MW-3, MW-4, and MW-6. <br /> • Analysis of the groundwater samples collected from Monitoring Wglls MW-1, MW-5, <br /> and MW-7 did not detect TPH-G or BTEX above the reported detection limit. <br /> -- Analysis of groundwater samples collected from MW-5, near the underground used <br /> oil tank, did not detect TPH-D. Total oil and grease and halogenated volatile organic <br /> compounds (EPA Method 8010) were not detected above the reported detection limits <br /> in the groundwater sample's collected from MW-5. <br /> E\0\10-151\SSI.Rrrl020494 5 <br /> f <br /> N/411bO <br /> �z <br />