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r <br />DRILL HOLE ABANDONMENT <br />Three types of hole abandonment were used at Hart Syncline during <br />the 1985 exploration activities. All three types are in <br />compliance with FCEL C-40288, and are identical to the methods <br />used under the previous Federal Coal Exploration License C-36445 <br />issued in July of 1983 for the Hart Syncline area. <br />Type 1: Shallow Holes (Drilled Within Stripping Limit) <br />A total of two (2) drill holes were drilled to depths of less <br />than 220 feet. In these two shallow holes, no artesian aquifers <br />were encountered. The holes were backfilled with as many <br />cuttings as possible and a surface plug of no less than five (5) <br />feet of cement was set. The excess cuttings were leveled and <br />dispersed evenly over the surface surrounding the hole. The <br />numbers and depths of the two drill holes abandoned in this <br />manner are: <br />040-85-10 <br />040-85-1OC <br />220' total depth <br />206' total depth <br />Type 2: Abandonment Fluid Holes <br />A total of six holes were drilled to depths as great as 770 <br />feet. The abandonment fluid was used in only the holes that <br />contained no artesian aquifers. The fluid used was Shur Gel, <br />which is a non-toxic bentonite based clay designed to seal drill <br />holes more effectively than cement. The abandonment fluid met <br />the following specifications: <br />1) 10-second API gel strength of at least 20 pounds per 100 <br />square feet. <br />2) Filtrate volume not to exceed 13.Scc. <br />