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Mr. Jim Stover <br />August 9, 1996 -New App./Bowie 2 <br />Page 18 <br />1st West and 2nd West Panels of the Orchard Valley (now Bowie No. 1) Mine is noted. <br />Paragraphs 3 and 4 <br />having been informed of the actual modified predictive techniques being used within the <br />original preparation of Exhibit 15, we concur with Dr. Abel's methodology, and the <br />arguments are acceptable to the Division. The projections which we offered in our earlier <br />adequacy comments were based on "worst case" projections, assuming totally effective <br />recovery. While we can understand BRL's reluctance to condone such a conservative <br />approach, it is normally the Division's mandated point of view. <br />Paragraph 5 <br />Subsidence monitoring, as outlined on amended page 2.05 - 92 -, applied <br />near subcrop areas of the mine, should verify the propriety of this assumption in the shallow <br />overburden portions of the mine plan. Response accepted. <br />1.5 BREAK ANGLES <br />Page 12 of Exhibit 15, as amended, now corresponds with our understanding of the <br />implications of the term "Break Angle". The proposed monitoring scheme should <br />determine the actual distribution of surface cracking. <br />1.6 ZONES OF POTENTIAL FRACTURING <br />Paragraph 1 <br />The new Section 1.8, added by BRL to Exhibit 15 addresses the Division's general concern <br />regaaling the possible subsidence implications of mining encountering a significant <br />discontinuity, such as a fault. The proposed rock mechanics investigations and enhanced <br />visual monitoring in the near surface faulted portions of the Mine should detect any <br />undesirable phenomena, allowing remedial techniques to be applied in a timely fashion. <br />Paragraph 2 <br />This concern has been previously addressed and resolved. <br />1.7 ZONES ALONG OUTCROP BARRJF.R PILLAR <br />