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F-L Brenneman Bulkhead <br /> Page 2 <br /> A very conservative estimation of intact rock irregularities <br /> present was made from 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+l (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 242 . 4 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 /> Total Perimeter area of rock irregularity = 'S PIn D <br /> wnere PIn = Perimeter of section n that has a surface <br /> within the area from section n + 1 when <br /> overlaying section n (ft) <br /> D = distance between section n and section n + 1 <br /> (ft) <br /> This gave a Total Perimeter area of rock irregularity for <br /> the bulkhead of 128 . 0 sq. ft. <br /> The percentage of intact rock perimeter area irregularity <br /> calculated by this estimation is 53% . This figure is high because <br /> of the decreasing x-sectional area but does not take into account <br /> the irregularities that exist on non-converging wall , floor or back <br /> surfaces and irregularities as small as 0. 15" would not be detected <br /> by this method. Visually I would estimate the perimeter area <br /> irregularity percentage to be higher than this figure. <br />