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<br />Maintenance of existing rcionitoring wells included workover of EX-2 to remove plugged <br />sample lines and trash so that bailed samples could be obtained. Surface pressure <br /> <br />transducer lines were buried and replaced as necessary. Manual water level lines were <br />installed in each of the hydrology monitoring wells (13). <br />4.3.4 Geotechnic+al Program <br />• <br />Sonar surveys were takers on the vertical sonar access wells for cavity #2 and #3. <br />Cavity #2 was surveyed on April 6, 1994 after considerable effort to open or straighten <br />up the hole to allow the sonar tool to pass into the cavity. A second survey was <br />attempted on April 28, 19Ei4 without success. It was during this attempt that a mill was <br />lost in the hole while trying to straighten it out. <br />Cavity #3 sonar access well, WRNM 26-94-1 M, was surveyed twice during 1994. As with <br />the sonar access well for cavity #2, there was a great deal of difficulty in entering the <br />cavity through this well. A stiff string mill setup was finally used to straighten the hole to <br />allow the sonar tool to pa:;s. Sonar surveys were taken on this well on September 23, <br />1994 and November 30, 1994. Because the sonar survey did not show the cavity <br />development as expected, a series of temperature surveys were also run. Temperature <br />surveys indicate that minir~g at this time appears to be limitied to the top half of the Boies <br />Bed. <br />. 29 <br />