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RULE 2 PERMITS <br />Overburden material will be excavated and stockpiled in a permanent out -of -pit disposal facility <br />identified on Map 23A as Out of Pit Spoil and Overburden Stockpile or used for backfilling and re - <br />contouring the pit. In addition, overburden materials around the perimeter of the mine blocks will be <br />exposed but not removed. <br />Colowyo drilled boreholes to obtain overburden and interburden samples for physicochemical analysis. <br />The locations of the boreholes relevant to this application are shown on Map 7A. These boreholes are 83- <br />133-06, 83-133-07, 83-133-10, 83-133-12, 83-133-14, 97-06, 97-09, 97-15, 99-02, 99-04, 99-09, 00-03, 00- <br />08, and ST -06-08. These drill holes are near or within the footprints of the proposed surface mine <br />expansions. <br />The CDMG Guidelines for the Collection of Baseline Water Quality and Overburden Geochemistry <br />recommends sampling one hole per square mile, with a minimum of three. The drill holes are distributed <br />sufficiently to meet this criterion. <br />Overburden and interburden samples from drill holes 97-06, 97-09, 97-15, 99-02, 99-04, 99-09, 00-03, <br />and 00-08 were collected from cuttings obtained during the drilling of each hole. The holes were drilled <br />with air. When a water source was encountered during drilling, water was injected to help flush the <br />cuttings from the holes. This continued until cuttings were no longer obtainable. <br />Overburden samples from drill holes 83-133-06, 83-133-07, 83-133-10, 83-133-12, 83-133-14 and ST -06-08 <br />were obtained from core samples. Drilling depths ranged from ground surface to between approximately <br />110 feet and 930 feet in depth. Samples were collected from intervals based on the material properties <br />such as color and texture or were collected at regular predefined intervals. Sample intervals ranged from <br />0.1 feet to 91 feet and averaged 8.5 feet. A total of 555 discrete samples were collected and analyzed to <br />characterize approximately 4731 feet of overburden. Coal seams within the drill holes were also analyzed <br />but are not included in this section because coal will not be used as reclamation material. <br />The following analyses and sample preparation were performed on overburden and coal samples: <br />South Taylor/Lower Wilson — Rule 2, Page 15 Revision Date: 11 / 18/16 <br />Revision No.: MR -163 <br />