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• <br />C <br />Expected significant surface movement beyond underground mining boundaries <br />varies from 275 to the east to 700 tt to the northwest. Changes in surface slopes are <br />moderate. Using the grid spacing of 100-ft, the average change in surface slope is less <br />than a percent over the entire area. <br />1 <br />0- <br />2000 2500 3000 3500 4000 4500 5000 <br />-1 .._ <br />W <br />Q) 3 <br />W <br />V) -4 <br />6000 <br />0 22D Model <br />-8 <br />Distance (ft) • Measured Data <br />• <br />Figure 11. Compared measured and calculated subsidence along a north-south cross <br />section, fixed cover. <br />21A <br />Maleki Trchnulo1!ie,. Inc.