2008-07-28_REPORT - C1996083 (2)

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Station General Location Result 7A - 7C Hubbard Creek No significant change 17A - 17F Hubbard Creek No significant change 1A- U D4 Headgate and Mining complete. Maximum subsidence 2.4' over D4 North Mains head ate 1A 23A - 23C Mouth of Dove Gulch No significant change 24A - 24G West Submains WD1 & B1 Mining complete. Maximum subsidence 7.8'(24G) 25A - 25F WD2 Panel & B2 Panel Mining complete. D-Seam max subsidence 5.7'(25C) B-Seam max subsidence 14.3 25C 26A - 26G WD1 Panel & 131 Panel Mining complete. Maximum subsidence 4.7'(26E) B-Seam max subsidence 12.2' (26E) 27A - 27D WD2 Panel & B2 Panel Mining complete. Maximum subsidence 4.0'(27B) B-Seam max subsidence 10.8'(27B) 28A - 28D WD1 Panel & 131 Mining complete. Maximum subsidence 6.2'(28B) B-Seam max subsidence 12.9'(28B) 29A - 29D WD2 Panel Outcrop 29A has subsided 17 30A - 30D WD Panels Outcrop No significant change 31A - 31 C D1 Tailgate No significant change 32A-32M B-2 Panel 32G Subsided 7.3'. Subsidence monument installed after D-Seam was mined. 33A-331 B-3 Panel 33A Subsided 6.2'. Subsidence monument installed after D-Seam was mined. 34A-34K B-3 Panel 34-A Subsided 5.3 Subsidence monument installed after D-Seam was mined. 34-B Subsided 6.0'. 35A-35D B-3 Panel 35-C Subsided 7.3'. Subsidence monument installed after D-Seam was mined. B-4 Panel No subsidence monuments over D-4. 8D B-5 Panel 8D located on the northern edge of B-5 Panel subsided 7.0'. 9A located in the center of B-6 panel subsided a total of 9A B-6 Panel 1.4 feet. 6' is attributable to the D Seam. The initial mining in B-6 likely triggered the --7/1/07 Freeman Gulch landslide. The table shows the B-1 and B-2 panels over the WD panels have added an additional 8.4', 7.1', 6.8' and 6.6' feet of subsidence at monuments 25C, 26E, 27B and 28B respectively. 3