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Mr. Jim Stover <br />August 9, 1996 -New App./Bowie 2 <br />Page 3 <br />2.04.5 -General Description of Hydrology and Geology - 9) Response accepted. <br />2.04.6 -Geology Description <br />10) BRL added the location of the fault in question to Map No. 7, "Geology". The presence <br />of this fault within the near suberop, shallower overburden portions of the underground <br />mine plan may have significant implications for the distribution of ground surface <br />subsidence. BRL did not address the earlier adequacy comments regarding faulting <br />implications at the Bowie No. 1 Mine. However, the Bowie No. 2 Mine's subsidence <br />discussion, subsidence control plan, and monitoring program will need to be amended to <br />address the implications of this fault. A thorough aerial photographic analysis of the permit <br />and adjacent area might assist in deFuring the location of potential faults. <br />11) This question requires response from BRL. Additional discussion regarding the acid base <br />potential of the coal to be mined is needed. <br />2.04.7 -Hydrology Description <br />12) BRL submitted Volume III, Exhibit 3, Completion diagrams. However, the text on page <br />2.04.22 references 13 drill hole completion drawings, and only 12 completion drawings <br />were presented in Exhibit 3 of Volume III. Please submit the remaining completion <br />drawing. Also, the application should add references to the completion drawing for DH-38 <br />and to the missing completion drawing on the cover page for that Exhibit. <br />13) This issue requires additional discussion. We have reviewed the Geology Map 07; the drill <br />logs provided on Map O8; the mine plan Map No. 14; and, the BRL response dated <br />July 28, 1996. We understand BRL proposes mining on the D-2 seam at this time. We <br />agree that the proposed east and northeast D-2 seam mine areas are located above the level <br />of Hubbard Creek. For this reason, direct impacts to surface flow in Hubbard Creek are <br />not likely unless areas that recharge Hubbard Creek are interrupted by mining in the <br />upgradient D-2 seam workings. Is this a possibility? <br />Additionally, groundwater and surface water quantity impacts outside the permit boundary <br />are possible if water depletion occurs as a result of mining. Water quality impacts are also <br />possible as water Fills the mine workings over time. The water may be of a degraded <br />quality, thereby impacting both ground and surface water resource down gradient and <br />outside the permit boundary. Please address this issue in detail. <br />Additionally, review of the drill hole logs from holes DH-10 and DH-18 indicate that the <br />D-2 seam is located at about the 6800-foot elevation. This is close to the elevation of <br />Terror Creek at areas west of the mine. Map No. 9 indicates a fault trending <br />