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Attachment <br />ForwardLandfill <br />187.6-Acre Closure Area <br />Drainage Control System <br />Modifications • <br />Item <br />No. Description Qty 187.6- Tota{ <br />Acre Area Unit Unit Costs <br />KMiscellaneous <br />Existing e S stem (1) Cost <br />ct V -Ditch Tpe 2 (2) 1 LS $ 50,000.00 $50a Inlets (3) 4,096 LF $ 38.50 $157,696 <br />tructures (3) 4 EA $ 2,100.00 $8,400 <br />pipe 24" HDPE (3) 4 LF $ 6,200.00 $24800 <br />l 920LF $46.10 $42,412 <br />eous arts/materials & shi in 5% $283,308 <br />Total Drains a Control S stem Modification Costs 1 LS $ 14 165.40 $14165 <br />NOTES: $297-471 <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 />• <br />DrainageSystem Back-upBASC <br />