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i,~ <br />TABLE N0. 1 <br />In Place Roof Rock Unsupported with No Allocaance for Discontinuities and No Beam Building <br /> Roof Span (f t.) <br />Design Conditions Fs = 4.0 Fs = 6.0 <br />A. Tunnel Drifts Only <br />1. Shale removed 32.0 26.1 <br />2. Shale suspended 28.0 22.9 <br />B. Intersections <br />1. Shale removed 16.0 13.0 <br />2. Shale suspended 14.0 11.4 <br />1 <br /> <br /> <br /> <br />1 <br />1 <br />t <br /> <br />J <br />