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Attachment 3 <br /> Forward Landfill - 187.6-Acre Closure Area <br /> Drainage Control System Modifications Cost Estimate <br /> Item Description Qty 187.6 Unit Unit Costs Total <br /> No. Acre Area Cost <br /> 1 Remove Existing Drainage System (1) 1 LS $ 50,000.00 $50,000 <br /> 2 Construct V-Ditch Type 2 (2) 4,096 LF $ 38.50 $157,696 <br /> 3 Drainage Inlets(3) 4 EA $ 2,100.00 $8,400 <br /> 4 Outlet Structures(3) 4 LF $ 6,200.00 $24,800 <br /> 5 Draina a pipe 24" HDPE(3) 920 LF $ 46.10 $42,412 <br /> Subtotal $283,308 <br /> 6 Miscellaneous arts/materials&shipping 5% 1 LS $ 14 165.40 $14,165 <br /> Total Drainage Control S stem Modification Costs $297,473 <br /> NOTES: <br /> Unit prices are based on recent bid for closure of the Jamestown Landfill prepared by Boston Pacific, Inc. (See <br /> Attachment No. 1), which is located within the same region as the Forward Landfill. The majority of permanent drainage <br /> control system features will be in-place at closure, including the perimeter channels, basins, and other features not over <br /> refuse. <br /> (1) Includes all drainage control system features over waste within the 187.6-acre closure area(i.e., downdrains, inlets, <br /> open channels, outlets, rip-rap, etc.). <br /> (2) Cost assumes placement of additional perimeter drainage channel along the edge of refuse as part of the 187.6-acre <br /> closure area over 50%of the total possible linear feet surrounding the area or 4,096 If(square root of total area, <br /> 4,196,248 sq ft=2,048 x 2 sides=4,096 If) . <br /> (3) Cost assumes placement of 4 downdrains(including inlets and outlets)along 4,096 If of slope over a 187.6-acre <br /> area, approximately one every 1,000 If,with each downdrain approximately 230 If from top of slope to bottom (4 x 230 If <br /> =920 If of 24-inch HDPE pipe). <br /> DrainageSystem Back-upBASC <br />