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1 <br /> custody for the stockpiled soil samples are included in Appendix B. <br />' 4.2 Groundwater <br /> 4.2 .1 Groundwater Elevation <br />' The relative groundwater elevations for the monitoring wells were <br /> calculated by subtracting the water depth from the casing elevation <br /> (Table 3) . Comparison of the June and October measurements <br />' indicates that water levels have dropped approximately one foot in <br /> all wells. The drop during the fall months is expected due to <br /> seasonal variations in water levels. <br /> TABLE 3 <br />' RELATIVE GROUNDWATER ELEVATIONS <br /> Depth to Relative <br /> Relative Groundwater Groundwater <br />' Well No. Casing Elevation <br /> Elevation 6/93 10/93 6/93 10/93 <br /> MW-1 98 . 83 66 . 22 67 . 51 32 . 61 31. 32 <br /> W <br /> M -2 97 . 33 64 . 74 66 . 06 32 . 59 31 . 27 <br />' MW-3 97 . 67 64 . 96 66 . 16 32 .71 31.51 <br /> * All measurements in feet <br />' 4.2 .2 Groundwater Flow Direction and Gradient <br /> Based on depth-to-groundwater measurements, the hydraulic gradient <br /> was calculated to be 0. 0050 ft/ft directed S 720 E (Figure 4) . <br /> This gradient is steeper than the previous gradient of 0. 0025 <br />' ft/ft; but the direction is nearly identical to the previous <br /> direction of S 700 E. <br /> 4 .2 .3 Groundwater Sample Analysis <br /> No petroleum hydrocarbons were detected in any of the samples. The <br /> laboratory results and chain of custody are attached in Appendix C. <br /> 5. 0 CONCLUSIONS & RECOMMENDATIONS <br />' 5. 1 Soil <br /> The soil sample results indicated that nearly all contaminated soil <br /> has been removed from the former UST site. Trace concentrations of <br /> benzene (0 . 006 ppm) and toluene (0 . 007 ppm) were detected in a <br />' 11 <br />