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CLEAOR�-W' IATER <br /> G R O U P, I N C <br /> 1 <br /> 3.0 RESULTS <br /> 3.1 Subsurface Lithology <br /> The subsurface lithology encountered during drilling consisted of poorly graded <br /> sand, silty and clayey sand, and lean clay In general, sand in the upper 30 feet of <br /> BMW-1 contained a higher percentage of silt than that encountered in the uppper 30 <br /> ' feet of BMW-2, indicating laterally heterogeneous soil un the shallow subsurface <br /> Below 30 feet bgs, poorly graded sand and interbedded lean clay were encountered in <br /> both borings Groundwater was encountered at appproximately 53 feet bgs while <br /> ' drilling Detailed soil sample descriptions are presented in Appendix B <br /> 3.2 Soil Sample Analytical Results <br /> ' Eighteen soil samples (nine from each boring) were chemically analyzed for TPH <br /> g Y Y g, <br /> TPHd, BTEX, and MTBE TPHg, BTEX, and TPHd were not detected in <br /> concentrations exceeding method detection limits in any of the soil samples. MTBE <br /> was detected in four samples collected between 24 5 and 39 5 feet bgs in BMW-1 and <br /> in two samples collected at 44 5 and 49 5 feet bgs in BMW-2 The maximum detected <br /> concentration of MTBE was 0 15 ppm in the 24 5-foot sample from BMW-1 Soil <br /> sample analytical results are summarized in Table 1 The laboratory analytical <br /> report is presented with the chain of custody in Appendix D <br /> 3.3 Groundwater Gauging <br /> g g <br /> On July 27, 1995, groundwater depth was gauged and samples were collected from <br /> BMW-1 and BMW-2 MBP representatives had attempted to arrange concurrent <br /> groundwater gauging events with Geocon, who is responsible for gauging <br /> groundwater in MW-5 and in the monitoring wells at the FDIC site However, the <br /> request was denied <br /> Groundwater at the MBP property was gauged at 5217 feet below top of casing <br /> (-6 14 feet mean sea level) in monitoring well BMW-1 and 5212 feet below top of <br /> casing (-6 35 feet mean sea level) in monitoring well BMW-2 Gauging data is <br /> presented in Table 2 and on Figure 3 On the basis of data from these two wells only, <br /> it appears that the groundwater gradient between BMW-1 and BMW-2 is <br /> approximately 0.004 feet/foot The groundwater flow direction cannot be <br /> determined on the basis of only two data points, however, the flow direction <br /> apparently has a southerly component <br /> C-115 PRE AR 10/95 5 October 11, 1995 <br />