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Bond Calculation for Reconstruction <br />of Unnamed Tributary <br />1. Earthwork Unit $/Unit Coat <br />Road cut/channel work 3600 (yd ) 1.12 $4030 <br />2. Riprap/Graded Gravel <br />D50 = 6 inches 86 (tons) 10.50 900 <br />D50 = 12 inches 75 (tons 9.60 720 <br />D50 = 0.75 inches 30 (tons) 7.00 210 <br />Installation 110 (ft) 24.00 2640 <br />Freight <br />Riprap 4 (trip hour 63.00 250 <br />Graded Gravel 1 (trip hour) 48.00 50 <br />Total w/o Contingency $8800 <br />10% Contingency 900 <br />Total w/Contingency $9,700 <br />