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Exhibit 60C <br />Subsidence Evaluation and 2004 Geologic Hazard Field Observations <br />West Flatiron Lease Area <br />• <br />• <br />L <br />8.0 FIELD OBSERVATIONS AND EVALUATIONS AT INDIVIDUAL LOCATIONS <br />FROM JULY 12 THROUGH JULY 16 <br />All but the last of these field observation locations for the West Flatiron Lease area were taken <br />concurrently with the subsidence and geologic field observations in the Apache Rocks and Box <br />Canyon mining areas during July 12 through I5, 2004. The last observation for the West Flatiron <br />Lease area occurred on July 16 from an observation point high on a methane drainage road on the <br />north side of [he North Fork. Figure 2 shows a vertical aerial overview of the general <br />topographic and geologic chazacteristics of the lease area. <br />831-032.650 Wright Water Engineers, Inc. Page 17 <br />November 2004 <br />