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Spring 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />3.1 of both the spring and fall subsidence monitoring reports. One additional baseline survey of <br />this grid is planned for completion during summer 2008. In addition, a baseline survey was <br />completed in fall 2007 to establish the current topographic profile of the Dry Fork Minnesota <br />Creek (Dry Fork) thalweg. This information was reported in Section 3.2 of the fall 2007 <br />subsidence monitoring report. Similar to the monitoring grid, this profile is planned to be <br />resurveyed during summer 2008 prior to longwall mining of Panel El. Detailed information for <br />each of these baseline surveys can be found in Appendix B and C of the fall 2007 subsidence <br />monitoring report. <br />E <br />r? <br />831-032.790 Wright Water Engineers, Inc. Page 10 <br />August 2008