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2004 Geologic Hazard Field Observations <br />South of Divide Mining Area <br />• remnant boulders neaz roads neaz the base of steep slopes, should be documented prior to <br />mining. It is suggested that signs stating, "Watch for Falling Rock" (shnilaz to signs <br />posted along major highways in high rockfall potential areas), be posted on the more <br />well-traveled roads, such as the Dry Fork and Main Fork of Minnesota Creek roads, when <br />(or before) mining begins in these aeeas. <br />5. There is no historical record from annual observations in the West Elk Mine azea <br />regazding effects of mining on springs and local water-bearing zones, with sources in <br />either surficial material or bedrock. It is recommended that spring and water well <br />monitoring be conducted before, during, and after mining in order to determine any <br />mining effects. <br />6. Although no cracks are expected in the soft, pliable alluvium, some cracks are expected <br />to occur on the harder and more highly compacted Dry Fork access road, particulazly in <br />the azea neaz the confluence of Deer Creek and Dry Fork. As discussed previously, the <br />• range of maximum vertical displacement, tilt, and horizontal strain is projected to be 8.4 <br />to 11.2 feet, 1.3 to 6.4 percent, and 0.7 to 4.2 percent, respectively, in the North Fork <br />stream valley and road above the solid coal boundaries at western limits of longwall <br />panels E2 and E3. <br /> <br />D:\WO~k\W WE~B3l-032~b21haVSOD GFA Hez\2004 SOD GeoHaz Reportdoc <br />831-032.621 Wdght Water Engineers, Inc. Page 49 <br />November 2004 <br />