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Spring 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />the eastern part of mined Lon-wall Panel 21 (Location S of' this report) and to continuC <br />Aiscrvations of the areas above Long wall Panels 19 and 20. <br />The location has hlStorlCally hCCn uSCCI to oh,CrvC and photnLraph ,uhsidcncC effects on the Ca,t <br />r ? <br />U <br />side of Box C anvon ahove Illllled Longwall Panels 11) and 20. (HOLlre 27) Shows that some new <br />rockfall/landslide activity has occurred in the Ielt CCnual pOrtion of the photograph (Compare <br />with Figure 28). The reason for the new activity IS difficult to assess, but hcheved to he at least <br />partially related to alining activities given that the area in under the Lon?gwall Panel 11) tailgate <br />and an area of, increased tensile strain. This area IS !tlso considered a Iltc(liunl to very hi"h <br />rockfall hai.ard area 00ap 3). <br />Figure 27. Spring 2008 northward view of the rockfall/landslide area above mined Longwall Panel <br />19. A comparison to prior photographs taken of this area from this vantage point shows that there <br />has been some additional activity (note the fresh looking scarp rock outcrop adjacent to two large <br />pine trees in left central portion of the photograph). <br />C] <br />831-032.790 Wright Water Engineers, Inc. Page 39 <br />August 2008