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Table 5 <br />Option 2 w Phase 2 <br />Option 2, Phase 2 - Channel Improvements & 34.9 aG-ft Detention in B509-03-00 <br />Item Item Description Unit Estimated Unit Price <br />I I I Quantity <br />Total Cost <br />No. <br />B112-02-00 Disconnect S Dam at B112-00-00 <br />10 Remove & Dispose of Existing Concrete Slope CY 128 $ 6.70 <br />$ <br />855 <br />Pavement <br />11 Excavation (Channel) CY 366 $ 4.80 <br />$ <br />1,756 <br />12 Embankment CY 1,170 $ 7.50 <br />$ <br />8,775 <br />13 24-IN RCP Low Flaw Qutfall Pipe LF 130 $ 50.00 <br />$ <br />6,500 <br />14 S' Reinforced Concrete Riprap, 2 Slopes at 2:1, CY 21 $ 270 <br />$ <br />5,610 <br />Av. Depth 8.5, (include Subgrade Work) <br />15 Concrete Low Flow Section (16' wide) CY 20 $ 300 <br />$ <br />5,926 <br />Subtotal B112-02-00 Disconnect & Dam at B112-00-00: <br />$ <br />29,423 <br />B609-03-00 Detention Basin Excavation - 53.5 ac-ft <br />16 Detention Excavation (Det. Rate = 0.55 ac-ftlac) CY 90,995 $ 4.00 <br />$ <br />363,979 <br />{Vt = Vr - Vc = 91.3 - 56.4 = 34.9 ac-ft} <br />17 Interceptor Structures EA 4 $ 2,500 <br />$ <br />9,655 <br />18 Inflow I Outfall Structure EA 1 $ 8,000 <br />$ <br />8,000 <br />Subtotal B509-03-00 Detention Basin Excavation - 53.5 ae-ft : <br />$ <br />381,834 <br />SWPPP Estimated at 10% x Cost <br />19 SWPPP EA 1 $ 153,417 <br />$ <br />153,417 <br />Subtotal option 2, Phase 2 - Existing B112-02-00 Grade <br />$ <br />1,764,298 <br />25% Contingency: <br />$ <br />441,074 <br />Total Construction Estimate Option 2 Phase 2: <br />$ <br />2,205,372 <br />Note: These estimates are to aid City of La Porte staff for planning purposes only. Unit prices and quantities <br />are approximate and subject to change. Engineering design methods were not performed to develop <br />estimates, presented herein, and shall not be used for bidding purposes. Actual construction estimates shall <br />be determined based on performing professional engineering design services. <br />Kiotz Associates Project No. 0127.011.000 B112-02-00 Drainage Study <br />July 2009 2 of 2 City of La Porte <br />