2010-03-05_REVISION - C1996083 (2)

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The Division has no further concerns. In the February 3, 2010 submittal, BRL accepted the Division's estimate. 13. All references to the gob vent boreholes mentioned in item number 12 above were removed from Map- 09. However, please also remove these references in the table on permit application page 2.05-34. The Division has no further concerns. Page 205-34 was revised in the February 3, 2010 submittal. Geotechnical Review 14. Maleki Section 2.0 - Data Collection Program Three geotechnical holes were drilled, and are illustrated on Figure 1. The locations of these three holes with respect to one another differ from what is shown on Map 09. Please verb that locations shown on Map 09 for geotechnical holes TC-03-01, TC-03-02 and TC-03-03 are accurate, and revise if necessary. The Division has no further concerns. Locations shown on Map 09 were correct; The Maleki 2010 report Figure 1 a, provided in the February 3, 2010 submittal, was revised accordingly. 15. Page 6 ofMTI2004 states that holes TC-03-02 and TC-03-03 "were drilled directly above the projected location of the mains. " TDR cables were cemented in all three holes (see Page 8), providing a means of "identifying the location of bed separation and shearing along the entire overburden. " With the new proposed location of the West Mains, the TDR cables installed previously would not seem to be able to provide BRL with the same level of information. However, revised pages 2.05-120 and -125 describe and list four subsidence monuments proposed for the vicinity of the West Mains, in a manner consistent with monuments established elsewhere at the mine. No response required. 16. Maleki Section 3.0 - Geotechnical Framework Section 3.1 describes the geologic setting of the Somerset Coal Field and the Bowie No. 2 Mine. The "West Mains fault" is addressed at the bottom of Page 9, but does not appear on Figure I of Maleki. A faint, dashed line does appear on revised Map 27 (and on PAP Map 07 - Geology) in the approximate location described by MTI2004. Map 08 (Geologic Cross Section) of the PAP clearly illustrates the interpreted magnitude of the fault, and implies a near-vertical plane. Due to the potential significance of this feature, its existence should be clearly indicated on each Map for which the fault may be pertinent. At a minimum, please modem Maps 07, 14-B and 27 to clearly portray the location of what the Division understands to be the "West Mains fault ". For Map 07, it may be more accurate to illustrate the location on the surface, if known, rather than at the B- or D-seam depth. The West Mains fault was added to Maps 07 and 27 that were provided in the February 3, 2010 submittal. However, please add the predicted fault trace to Map 14-B, as originally requested. 4