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American Tunnel Bulkhead <br /> Page 4 <br /> The x-sections maximum dimensions are in the range of 12. 5 ' x 14. 2 ' <br /> and the average dimensions are smaller . <br /> The design assumption was a 13' x 13' x-section. As discussed <br /> previously, this is consistant with the 13 ' rib to rib dimension <br /> assumed for design with an additional 4% factor of safety. The <br /> average x-sectional area of the bulkhead is 142 . 5 sq. ft. compared <br /> to the assumed 169 sq. ft. <br /> Please call if you wish to discuss this submital or if any of the <br /> submitted information does not meet DMG ' s approval for pouring the <br /> bulkhead. <br /> Sincerely, <br /> Larry Perino <br /> Superintendent-Technical Services <br /> cc: Patricia Nelson, CDH <br /> Chris Hayes <br /> LP/cjm <br />