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<br />1 depth or amount of bentonite slurry material injected into the hole <br />was devised. The method included accurately measuring the amount <br />' of slurry pumped from the mixing vessel, monitoring the rise of <br />standing water in the hole and measuring the surface rise of the <br />slurry mixture with a bulb shaped probe. <br />' DRILL HOLE No. 3: <br />As noted above hole No. 3 was drilled approximately 3-feet <br />' east of hole No. 2. The hole was advanced to a depth of 30-feet on <br />March 18, 1994. As was the case with hole No. 1 the suspected <br />aquifer identified at 21-feet in hole No. 2 was not encountered at <br />t the anticipated depth. Thus, it was decided that this hole also be <br />abandoned. Hole No. 3 was left open and periodically monitored <br />until April 8, 1994 at which time it was backfilled with bentonite <br />' "Hole Plug" pellets. During the time the hole was open it <br />eventually indicated a standing water surface at 17.8-feet, which <br />roughly corresponds with the measurements taken in successfully <br />installed piezometers in the vicinity. Given the eventual depth of <br />t standing water in this hole it may have intercepted the fringe or <br />outer edge of the targeted aquifer, but did r.ot intercept it <br />scuarely. <br />DRILL HOLE No. 4: <br />1 <br /> <br /> <br /> <br />1 <br /> <br />Drill hole No. 4 was located 3-feet south of hole No. 2. The <br />hole was advanced to a depth of 60-feet on March 18, 1994. <br />Drilling conditions experienced with hole No. 4 were very similar <br />to those encountered with hole No. 2 and the same six water bearing <br />intervals identified in hole No. 2 were intercepted. The <br />pile/alluvium contact occurred at 45.67-feet. On March 21, 1994 <br />cutting debris was flushed from the hole and the 102 series <br />piezometers were installed as follows: <br />PZ Tip Slot Sand Pack (ft) Slurry Plug (ft) <br />ID Depth Length From Tc From To <br /> (ft) (ft) <br />107 58.5 8.5 55.0 46.0 46.0 44.0 <br />1C6 42.75 1.0 44.0 41.0 41.0 39.0 <br />105 38.5 1.0 39.0 37.0 37.0 34.35 <br />104 33.5 1.0 34.25 32.0 32.0 29.3 <br />103 23.5 1.0 29.3 27.1 27.1 18.0 <br />102 17.5 2.0 18.0 14.0 14.0 0.0 <br />In the table presented above (and those that follow) the <br />interval between "Sand Pack" depths represent moisture bearing <br />zones while the interval between "Slurry Plug" depths represent dry <br />9 <br />