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<br />Western Mutual Diversion Repairs and Improvements
<br />CWCB Feasibility Study
<br />May 6, 1998 (Revised December 29, 1998)
<br />
<br />Cost Estimates of Check Replacement Alternatives
<br />
<br />Costs were estimated for the concrete vertical drop, the sheet pile vertical drop and the sloping
<br />riprap drop check structures mentioned previously, Construction cost estimates are presented in
<br />Table 2, The sheet pile option is preferred over the concrete wall option because the estimated
<br />cost of $76,000 to $97,300 is 28 to 33 percent less than the other two alternatives. The concrete
<br />vertical drop is estimated to cost $106,400 to $140,300. The sloping riprap drop is estimated to
<br />cost $113,200 to $145,700. Of the two vertical drop alternatives, the sheet pile option is believed
<br />to be the easiest to construct in the river environment. It does not require dewatering to install, and
<br />then serves as its own coffer dam for dewatering the riprap basin area. It can also be constructed
<br />during inclement weather more easily than can concrete,
<br />
<br />Table 2
<br />
<br />Summary of Estimated Check Structure Replacement Costs
<br />Western Mutual Ditch - Diversion Repairs and Improvements
<br />
<br />Vertical Riprap Drop - Sheet Pile Crest Wall
<br />Descri ption Quantity Unit Unit Costs Item Costs
<br /> Low Estimate High Estimate Low Estimate High Estimate
<br />Steel Sheet Pile 2,330 SF $15,00 $20,00 $34,950,00 $46,600,00
<br />Catwalk 3,300 LB5 $3,50 $4,00 $11 ,550.00 $13,200,00
<br />Flashboards 120 SF $2.50 $3,50 $300,00 $420,00
<br />Flashboard Supports 320 LBS $3,50 $4,00 $1,120,00 $1,2BO,OO
<br />Stop Logs 30 SF $5.00 $7,00 $150,00 $210,00
<br />Riprap 1,314 Tons $17,00 $20,00 $22,338,00 $26,280,00
<br />Bedding 318 Tons $11.00 $13.00 $3,498,00 $4,134,00
<br />Excavation 1,100 CY $1.00 $2.00 $1,100,00 $2,200,00
<br />Dewatering 1 EA $1,000,00 $3,000,00 $ 1 ,000,00 $3,000,00
<br />Total $76,006.00 $97,324.00
<br />
<br />(Continued)
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