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• No subsidence related features were noted during the pedestrian surveys. There are <br />no reports of subsidence or subsidence related problems from any adjacent landowner or utility <br />company. <br />Although high cover minimizes the expression of subsidence features on the ground <br />surface, no subsidence features were noted in the area above the Roadside North Portal Mine. <br />The route traversed was directly over the area where the 2 West Panel was second mined. <br />Particular attention was given to those areas in the topography where slumps or cracks would <br />be more apparent, such as ridge lines. <br />The attached photographic review of Jerry Creek Canyon depicts the canyon itself, the <br />steep nature of the canyon walls and the dry, ephemeral stream channel of Jerry Creek. <br />Subsidence Surveys <br />Stipulation 12 requires that five subsidence monitoring stations in Jerry Creek Canyon <br />• <br />• <br />and Coal Canyon be surveyed to detect movement or change in elevation. Two surveys were <br />conducted during 2001. Table 1 shows the results of the surveys conducted since 1996. <br />These results indicate no subsidence at any of the measured locations. <br />TABLE 1 -SUBSIDENCE MONITORING SURVEY DATA CO MPARISON <br /> SUBSIDENCE MONUMENT ELEVATIONS <br />Date SM01 SM02 SM03 SM04 SM05 <br />Fa111996 4869 .36 4898 .68 4970 .44 4985. 68 5121 .62 <br />04/17/97 4869 .30 4898 .53 4870 .47 4985. 74 5121 .65 <br />12/18/97 4869 .45 4898 .71 <br />10/05/98 4869 .24 4898 .56 4970 .27 4985. 72 5121 .55 <br />12/15/98 4869 .23 4898 .56 4970 .27 4985. 72 5121 .55 <br />08/30/99 4869 .54 4898 .90 4970 .65 4986. 11 5121 .81 <br />11/23/99 4869 .41 4898 .81 4970.14 4985. 97 5121 .74 <br />4/24/00 4869. 45 4898 .84 4970 .50 4986. 04 5121 .75 <br />9/11/00 4869. 45 4898 .85 4970 .53 4986. 04 5121 .74 <br />5/22/01 4869. 27 4898 .52 4970 .46 4985. 80 5121 .51 <br />9/24/01 4869. 26 4898 .65 4970 .46 4985. 89 5151 .67 <br />2001 Subsidence Report Page 3 <br />