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Page Title:
Table C5. Alternative 3: Hydraulic Dredging, Sand Separation, Dewatering and CDF Fines Disposal, Engineering Costs |
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 ERDC TN-DOER-C27
July 2002
Table C5
Alternative 3: Hydraulic Dredging, Sand Separation, Dewatering and CDF Fines
Disposal, Engineering Costs
Engineering Costs, Alternative 3
Total
tons/
Cost Item
$/ton
$/cy
Total cy
cy/yr
Total $
$/yr
Tons
yr
Hyd Dredging Cost1
$4
0
225,000
112,500
900,000
$450,000
Mech Dredging Cost1
$7
0
0
$0
Mobilization/demobilization
0
0
1,000,000
$500,000
Separation1
$15
0
0
$0
Separation/Dewatering1
$60
0
225,000
112,500
13,500,000
$6,750,000
Transportation2
$110
0
0
$0
Disposal2
$50
0
0
$0
Revenues from sale
-1
0
33,613
-16,807
-33,613
-16,805.5
Total:
$15,366,387
$7,683,194
CDF Construction3
$6
100,158
$600,948
Capping
no freeboard or ponding volume
$306,488
1
Based on in situ volumes or weights.
2
Based on processed volumes or weights.
3
Based on sediment storage volume. Estimated unit costs are based on literature values for similar size CDFs, with upward
adjustments made where freeboard and ponding are required.
Table C6
Alternative 3: Hydraulic Dredging, Sand Separation, Dewatering and CDF Fines
Disposal, Financial Costs (Interest Rate = 0.06375)
2001
2002
2003
Cubic Yards
0
112,500
112,500
$/yr
$600,948
$7,683,194
$7,989,682
IDC (interest during construction)
$122,414
$1,010,832
$509,342
Cost/Year
$723,362
$8,694,026
$8,499,024
Total Financial Investment:
$17,916,411
CDF Construction included here if completely precedes dredging.
CDF and first-year dredging included here if they will both occur in the first year.
Although there is no freeboard or ponding volume that must be filled, it was assumed that some form of cap would be
required at closure, and a representative value was included based on amount calculated for other sites.
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