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Memo to Tom Schreiner 10 February 21, 2006 <br />Bulkhead Cost Estimate Permit No. M-1983-141 <br />M„ _ w 8PZ _ 13308 x 8Z =106448 foot pounds <br />M _ M~ _ 106448 =163766 foot pounds <br />0.65 0.65 <br />I bh'l12 <br />S=-= <br />c h/2 <br />_ M~ _ M~ _ 6xM~ <br />f` S (bh'l12)l(h/2) bhZ <br />h Z_ 6 x M„ _ 6 x 163766 z= 25 square feet <br />bxf, 1x273x144in /ft <br />h = 5 feet <br />where: f =flexural stress (psi) <br />f'~ =concrete compressive strength (psi) <br />w =pressure (dead) load (pounds per foot) <br />p =pressure head (psi) <br />M„ =maximum bending moment (foot pounds) <br />k = adit width (feet) <br />M„ =design bending moment (foot pounds) <br />S =section modulus (cubic inches) <br />I =moment of inertia (inches4) <br />c = centroidal distance (inches) <br />b =beam width (one inch) <br />h =bulkhead length (feet) <br />The forgoing analysis demonstrates that required minimum length for a plain concrete bulkhead is 5 feet, <br />which is a manageable length for constructability. Hence, a plain concrete structure with only temperature <br />and shrinkage control steel at each end is acceptable for the proposed secondary bulkhead. <br />Desien of the Secondary Bulkhead for Construction Cost Estimatin¢ Pumoses <br />The basic design elements for the proposed main bulkhead are as follows: <br />• bulkhead dimensions are 8' x 8' x 5' long <br />• bulkhead volume is 11.9 cubic yards <br />• low pressure grouting is necessary <br />