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Spring 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• <br />Figure 10. Spring 2008 photograph of a subsidence crack located on the uphill side of the <br />drill road to West Flatiron. Aside from some increased weathering along the sandstone face, <br />there does not appear to have been any changes at this location from the previous year. <br />0 5.4.2 Location 4 <br />FI1ure I I is of a rockfttl located above the drill road to \Vc,,t Flatiron as descrihed in previous <br />annual reports. The tall, which occurred on June 30, 2004, is located above the north cdI of the <br />central hart of' mined Longwall Panel 14. A photograph of the same rockfall area taken dw-1110 <br />the summer of 2006 is provided as Figure 12 for coatlharison. <br />The overhurden depth to the 13-seam at this location is .ahaut 1,950 feet. Although Loncnwall <br />Panel 14 was Illlned ahout five years and suhsidence likely has hecn completed. suhsidence <br />effects could still occur in these ru?11"ed cliff ?u-eas. <br />• 831-032.790 Wright Water Engineers, Inc. Page 22 <br />August 2008