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TABLE 6. Maximum Predicted Tower Foundation <br />• Subsidence Effects from Longwall Mining Under <br /> Previously Subsided Ground <br />Mining Single Longwall Panel Multiple Longwall Panels <br />Depth Potential Diagonal Tilt Potential Diagonal Tilt <br />(ft) Shortening Extension (min) Shortening Extension (min) <br /> (ft) (f t) (ft) (ft) <br />1200 0.26 0.16 40.0 0,17 0.22 56.7 <br />1500 0.18 0.07 22.3 0,14 0.18 45.4 <br />1600 0.16 0.07 18.4 0.13 0.17 42.5 <br />2000 0.10 0.04 9.5 0.10 0.13 34.0 <br />2400 0.07 0.02 5.5 0.09 0.11 28.4 <br />• <br />• <br />