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At each monitoring well, the well cover was removed and the elevation at the top of the well casing <br /> was determined to 0.01 foot. A black mark was made on top of the well casing io indicate the <br /> precise elevation point. After elevations were obtained for the casing tops, a Solinst electronic <br /> water sensing device, accurate to 0.01 foot, was lowered into the well casing to measure the <br /> distance from the casing tops to the groundwater surface. The Solinst readings were then <br /> subtracted from the elevations at the casing top to obtain a groundwater elevation. <br /> Based on reports from investigations in the immediate vicinity of the site, groundwater flow <br /> direction is anticipated to be to the north northeast. The groundwater survey data is not presented <br /> herein because the measured groundwater elevations exhibited unexplained variations that could be <br /> the result of: <br /> 1) Perched groundwater conditions <br /> 2) Slow recharge or unstable groundwater levels in the wells <br /> 3) Seasonal variation <br /> 4) Irrigation of adjacent sites <br /> The groundwater elevations will be surveyed again in the near future and the results will be <br /> submitted as an addendum to this report. A summary of the groundwater data is included herein as <br /> Table 1. <br /> 6.5 BORING ABANDONMENT PROCEDURES " <br /> Following sampling, the borings (SB-1 through SB-3) were abandoned by pouring medium-size <br /> bentonite chips through the augers to the bottom of the bore holes. As the bentonite level rose, the <br /> augers were raised slowly and removed from the boring one section at a time. The bentonite <br /> elevation was monitored regularly by the drilling crew with a weighted tape that was lowered from <br /> the ground surface to the top of the bentonite to ensure the level of the bentonite was always above <br /> the elevation of the cutting head. The level of bentonite was raised to an elevation of about 1 foot <br /> bgs, at which time the bentonite was hydrated with tap water. Bentonite was then added and <br /> hydrated flush with the existing surface grade. <br /> JN 40007-088-01 <br /> 11i& X97-06jw\arc uac.dm <br /> 6-3 <br />