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I I I I I I I I I I I I I I I I I I I Description of Proposed Improvements: Sheet 3 Estimated Cost of Proposed Improvements: Sheet 3 (Reach F) The 100-year flood plain illustrated is expansive, but very shallow. The flow rates in even the lOO-year flood are small enough that they could be conveyed easily in a small storm sewer system or a surface channel. Since the property will likely be developed for commercial use, it is recommended that no major drainage system is necessary. The future developer will be re- quired to adequately drain his property toward Quail Street. Item Description CONSTRUCTION Overflow Spillway at Ditch Graded Earthen Swale Construction Sub-total 15% Engineering 10% Contingencies Total Construction Quantity Unit Unit Price Cost 1 L.S. $ 5,000 $ 5,000 530 C.Y. 3 1,590 6,590 %9 659 $ 8,238 The only required improvement is a spillway on the Agricultural Ditch which will discharge excess storm flows into the Dry Gulch basin rather than allowing the ditch to convey them out of the basin. For this purpose, a graded channel is proposed to con- nect the spillway to Quail Street. A permanent right-of-way for the channel is required, although it is conceivable that a future developer may elect to place the channel flow in an underground conduit. LAND ACQUISITION Right-of-way Acquisition 10% Contingencies 5% Legal Total Land Acquisition TOTAL COST 0.67 A 35,000 23,450 2,345 1,172 $26,967 $35,205