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TABLE 1 <br /> RELATIVE GROUNDWATER ELEVATIONS <br /> Relative <br /> Depth to Groundwater <br /> Well No. Relative Groundwater Elevation <br /> Casing <br /> Elevation 693 9/93 6/93 9/93 <br /> / <br /> EW-1 53 . 21 56.90 59. 93 -3 .24 -6.72 <br /> MW-6 52 . 99 56. 23 59.22 -3 .82 -6. 23 <br /> MW-7 53 .90 57 . 72 60.71 -3 .78 -6.81 <br /> MW-8 53 . 68 57 . 46 60.46 -3 .88 -6.78 <br /> MW-9 53 . 54 57 . 42 60. 50 -3 .44 -6.96 <br /> IMW-10 53 . 21 56. 65 59. 64 -4 . 10 -6. 43 <br /> MW-11 52 .95 57 . 05 60. 14 -4 . 51 -7 . 19 <br /> MW-12 53 . 35 57 . 86 61. 04 -5.44 -7 . 69 <br /> MW-13 53 . 36 58 .80 61. 21 -3 . 69 -7 .85 <br />' MW-14 ---- ---- 60. 24 ---- ---- <br /> * All measurements in feet <br /> 3.2 Remediation Well Installation <br /> 3 .2 . 1 Drilling and Sampling <br />' On October 12 and 13 , 1993 , three soil borings were drilled at the <br /> site. The borings were located within the plume of soil <br /> contamination illustrated in Figures 8-14 of GeoAudit's Final <br /> Remedial Plan (July 1993) . One boring (VW-5) was advanced to a <br />' depth of 55 feet; VW-6 and VW-7 were advanced to a depth of 60 <br /> feet. These borings are located in Figure 2 . The borings were <br /> drilled using a Mobile B61 HDX truck--mounted drill rig. The B61 and <br />' two-man drill crew were provided by V & W Drilling of Rio Vista. <br /> Discrete soil samples were collected at five-foot intervals using <br />' a 140-1b hammer to advance a split-spoon sampler loaded with three <br /> 2-inch by 6-inch brass sleeves. The number of blows required to <br /> advance the sampler 18 inches was recorded on the boring log (see <br /> Appendix A) . To avoid cross contamination, the sampling equipment <br /> was washed in a tri-sodium phosphate (TSP) solution and rinsed <br /> twice with water prior to each sampling run. <br />' 6 <br />