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• TABLE 4. Maximum Predicted Tower Foundation <br />Subsidence Effects from Lon <br />wall Mimi <br />Und <br />r Vi <br />i <br />G <br />d <br /> g ng e <br />rg <br />n roun <br />Mining Single Longwall Panel Multiple Longwall Panels <br />Depth Potential Diagonal Tilt Potential Diagonal Tilt <br />(f t) Shortening Extension (min) Shortening Extension (min) <br /> (ft) (ft) (ft) (ft) <br />1200 0.23 0.14 36.0 0.16 0.20 51.0 <br />1500 0,16 0.07 20.9 0.12 0.16 40.8 <br />1600 0.14 0.06 16.6 0,12 0.15 38.3 <br />2000 0.09 0.03 8.5 0,09 0.12 30.0 <br />2400 0.06 0.02 4.9 0,08 0,10 28.4 <br />n <br />U <br />C~ <br />