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American Tunnel Bulkhead <br /> Page 2 <br /> TABLE 1 <br /> SECTION h-Sectional Area (sq. ft. ) Comment <br /> 0 + 54 . 17 134. 00 Water-side <br /> 0 + 46 . 70 133 . 00 <br /> 0 + 44. 10 145. 40 <br /> 0 + 40. 10 140. 40 <br /> 0 + 36 . 40 158 . 20 <br /> 0 + 32. 30 146 . 00 <br /> 0 + 28 . 85 144. 60 Air-side <br /> 0 + 24. 90 141. 60 Valve centerline <br /> An estimation of intact rock irregularities present was made from <br /> the x-section data. This was done by: <br /> 1) measuring the perimeter at a section. <br /> 2) measuring the perimeter at that section of the next <br /> section' s intrusion into that area. This was done by <br /> overlaying consecutive x-sections. <br /> 3 ) assuming the perimeter area between sections is the <br /> average of the perimeters at each end of a section times <br /> the distance between sections and the sum of section <br /> perimeter areas is the total perimeter area within the <br /> bulkhead. <br /> Total perimeter area = < Pn + Pn+1 (D) <br /> 2 <br /> where P (n) = Perimeter at section n (ft) <br /> D = distance between section n and section n + <br /> 1 (ft) <br /> This gave a Total Perimeter Area of 1143 . 3 sq. ft. <br /> 4) assuming that any intrusion into the overlain x-section <br /> exists over the distance between sections, a value for <br /> perimeter area of intact rock irregularity was obtained <br /> for each section and the total perimeter area of rock <br /> irregularity was assumed to be the sum of the values <br /> obtained for each section. <br />