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Cost I I I I I I I I I I I I I I I I I I I Estimated Cost of Proposed Improvements: Sheet 5 (Reaches E & F Combined) Description of Proposed Improvements: Sheet 5 Item Description Quantity The intersection of l4th Place and Miller Street lies in a low area subject to extensive flooding. Under present conditions a deep pond would occur in a lOO-year storm which would even- tually become deep enough to spill northward over Colfax Avenue. The 54-inch pipe entering the low area is sized to convey the ten-year flow, the 18-inch pipe under Colfax is sized to convey the lOO-year flow, in order to reduce the size and depth of the ponding area. Between Colfax Avenue and l5th Place, numerous inlets are recommended to collect the flow discharged from the Westland Shopping Center. The lO-year flow cannot be collected entirely by the designated inlets, so future laterals are re- quired to collect the flow. Laterals are recommended extending west on the north side of Colfax Avenue, west into the Westland parking lot from the intersection of 15th Place and Miller Street, and north on Miller Street from 15th Place. CONSTRUCTION 54" Storm Sewer 78" Storm Sewer 108" Storm Sewer 10' x 61 Box Asphalt over 54" Pipe Asphalt over 78" Pipe Asphalt over 108" Pipe Asphalt over 10' x 6' Box Manholes Inlets Inlet Pipe Asphalt over Inlet Pipe Curb and Gutter Replacement Outlet Headwall Open Channel Excavation Slope Protection Slope Protection Filter Low Flow Channel Construction Sub-total 15% Engineering 10% Contingencies Total Construction LAND ACQUISITION Right-of-way Acquisition Easements along Pipe Lines Land Acquisition Sub-total 10% Contingencies 5% Legal Total Land Acquisition 'KlTAL COST Sheet 5 Costs in Each Reach Reach E Reach F Total Const. $ 389,962 $ 393,875 480 550 625 55 30 450 290 55 6 26 630 630 390 1 10,500 3,200 800 105 An open channel is proposed along the alignment of an existing channel south of l5th Place. The channel bottom must be lowered to conform to required pipe elevations at each end. Terraced gab ion or concrete lined sideslopes are recommended because of the channel depth and to avoid excessive right-of-way acquisi- tion. Maintenance access is possible from the adjacent street. Flow velocities in the lO-year and lOO-year floods would not be excessive, because of the backwater created by the proposed culvert under Kipling Street. 1.21 1,540 Unit Unit Price L.F. $ 85 L.F. 200 L.F. 360 L.F. 380 L.P. 22 L.F. 25 L.F. 28 L.F. 30 Ea. 1,000 Ea. 1,000 L.F. 30 L.F. 18 L.F. 10 L.S. 5,000 C.Y. 3 C.Y. 22 C. Y. 17 C.Y. 210 A 25,000 L.F. 15 Land Acquisition $ 41,5l5 $ 19,837 $ 40,800 110,000 225,00 20,900 660 11,250 8,120 1,650 6,000 26,000 18,900 11,340 3,900 5,000 31,500 70,400 13,800 22,050 $627,070 94,060 62,707 $783.837 30,250 23,100 $ 53,350 5,335 2,667 $ 61,352 $845,189 Total $431,477 $413,712