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<br />TABLE A.1 <br />Rock Core Logging System <br /> <br /> <br />Column Description <br />Interval The coring interval or sample identification number. <br />Penetration (ft) The length the core barrel was advanced during the coring interval. <br />Recovery (ft) The length of core recovered. Gains and losses can be transferred to <br /> adjacent runs and cancel each other out during the process of determining <br /> where core loss or gain is located. <br />Recovery (%) The percent of core recovered (shown in histogram as white). <br /> Recovery (%) -Recovery (ft)IPenetration (ft) <br />RQD (ft) The sum of the total lengths of solid core which are equal to or greater <br /> than 0.4 ft. If the core is broken by handling or the drilling process <br /> (mechanical breaks), the broken pieces are fitted together and counted as <br /> one piece provided that they form the required length. The length of these <br /> pieces is measured along the centerline of the core. <br />RQD (%) The RQD percent (shown in histogram as solid). <br /> RQD (%) _ (RQD (ft)/Penetration (ft)) ' 100 <br />Coring Time (min) Time to advance the core run. Time does not include drill down time, etc. <br />No. of Pieces The number of pieces recovered in the core run. <br />Longest (ft) The longest piece recovered in the run. The longest piece includes any <br /> lengths separated by mechanical breaks. <br />Shortest (ft) The shortest piece recovered. Pieces bounded by mechanical break(s) <br /> are not included. <br />GEl Consultants, Inc. <br />