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VINi~ & ENVIRONMENTAL SERVICES LLC <br />the north edge of the adit. As a result, it was decided to move the final bulkhead <br />location outby another 20 feet. <br /> <br />Drawing sheet 6 shows the locations of these probe holes. <br />At this new location, an additional advantage was that the bulkhead closure could <br />take in the 6-inch borehole to the next level up, resulting in sealing that potential <br />water infiltration pathway from above as well. <br />• <br />Figure 3: Probe hole drilling in Pierce adit floor <br />