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Subsidence Evaluation For <br />Exhibit 60[3 South of Divide Mining Area Page 34 <br />• <br />7. There is no historical record from annual observations in the West Elk Mine area <br />regarding effects of mining on springs and local water-bearing zones, with sources in <br />either surficial material or bedrock. It is therefore recommended that spring and water <br />well monitoring be conducted before, during, and after mining in order to determine any <br />mining effects. <br /> <br />• <br />8. Although no cracks are expected in the soft, pliable alluvium in Dry Fork, some cracks <br />are expected to occur on the harder and more highly compacted Dry Fork access road, <br />particularly in the area near the confluence of Deer Creek and Dry Fork. As discussed <br />previously, the range of maximum vertical displacement, tilt, and horizontal strain is <br />projected to be 8.4 to 11.2 feet, 1.3 to 6.4 percent, and 0.7 to 4.2 percent (respectively) in <br />the Alorth Fork stream valley and road above the solid coal boundaries at western limits <br />of longwall panels E2 and E3. <br />C\ R'ORr.'i6'R'E~BiI-03Z+69md°F~L¢6~}2006.doc <br />831-032.690 <br />Wright Water Engineers, Inc. <br />