Silver Creek - Division of Water Quality - Utah.gov
Silver Creek - Division of Water Quality - Utah.gov
Silver Creek - Division of Water Quality - Utah.gov
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<strong>Silver</strong> <strong>Creek</strong> <strong>Water</strong>shed TMDL Final Report<br />
Excavation and Topsoil Total = $4,991,615.00<br />
Wetland at <strong>Silver</strong> Maple Claims Complex<br />
The Wetland is sized based on the maximum daily metal load (Zn and Cd) <strong>of</strong> 12.73 lbs/day<br />
(5774 gms/day) and metal removal capacity <strong>of</strong> 4.3 gms/day/m 2 <strong>of</strong> wetland surface area . Wetland<br />
area required is approximately 0.34 acres (1342 m 2 ).<br />
(0.34 acres)(43560 sq. ft./acre)($3.00/sq.ft.) = $44,431.00<br />
Wetlands at Flood Plain Tailings<br />
The Wetland is sized based on the maximum daily metal load (Zn and Cd) <strong>of</strong> 27.18 lbs/day<br />
(12,329 gms/day) and metal removal capacity <strong>of</strong> 4.3 gms/day/m 2 <strong>of</strong> wetland surface area .<br />
Wetland area required is approximately 0.71 acres (2867 m 2 ).<br />
(0.71 acres)(43560 sq. ft./acre)($3.00/sq.ft.) = $92,782.80<br />
Richardson Flat to Above Atkinson<br />
The stream reach from Richardson Flat to Above Atkinson is approximately 4.1 miles in length.<br />
Isolation <strong>of</strong> the stream would require a pipe culvert or lined ditch/stream channel.<br />
Lined ditch/stream = (4.1 miles)($50/ft) = $1,082,400.00<br />
or 48” pipe culvert = (4.1 miles)($88/ft) = $1,905,024.00<br />
The area containing contaminated soils is approximately 2621 acres in size. Moving<br />
contaminated tailings material to an approved repository would involve the excavation <strong>of</strong><br />
16,914,070 cubic yards <strong>of</strong> material.<br />
Excavation = (16,914,070 cu.yd.)($4.00/cu.yd.) = $67,656,280.00<br />
Top soil = (12,685,540 sq.yd.)($2.60/sq.yd.) = $32,982,404.00<br />
Excavation and Topsoil Total = $100,638,684.00<br />
Above Atkinson to Atkinson<br />
The stream reach from Above Atkinson to Atkinson is approximately 0.5 miles in length.<br />
Isolation <strong>of</strong> the stream would require a pipe culvert or lined ditch/stream channel.<br />
Lined ditch/stream = (0.5 miles)($50/ft) = $132,000.00<br />
or 48” pipe culvert = (0.5 miles)($88/ft) = $232,320.00<br />
The area containing contaminated soils is approximately 246 acres in size. Moving<br />
contaminated tailings material to an approved repository would involve the excavation <strong>of</strong><br />
1,587,519 cubic yards <strong>of</strong> material.<br />
Excavation = (1,587,519 cu.yd.)($4.00/cu.yd.) = $6,350,076.00<br />
Top soil = (1,190,631 sq.yd.)($2.60/sq.yd.) = $3,095,640.60<br />
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