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Table 3 <br />Option 2 <br />Option 2 - Existing B112-02-00 Grade & City Constructed Detention <br />Item Item Description Unit Estimated Unit Price Total Cost <br />No, I I I Quantity <br />8509-03-00 Detention Basin (166 ac Area at 0.65 ac-ftlac = 91.3 ac-ft Req <br />32 Detention Excavation (Det. Rate = 0.55 ac-ftlac) CY 90,995 <br />(Vt = Vr - Vc = 91.3 - 56.4 = 34.9 ac-ft) <br />33 Interceptor Structures EA 4 <br />uired) <br />$ 4.00 $ 363,979 <br />$ 2,5001 $ 9,665 <br />34 l Inflow 1 Outfall Structure ] EA i 1 I $ 8,0001 $ 8,000 <br />Subtotal B509-03-00 Detention Basin j166 ae Area at 0.65 ac-ftli ac = 91.3 ac-ft Required): $ 381,634 <br />SWPPP Estimated at 10% x Cost <br />35 SWPPP I EA 1 $ 246,442 $ 246,442 <br />Subtotal Option 2 - Existing B112-02-00 Grade & City Constructed Detention: 1 $ 2,834,080 <br />25% Contingency: ] $ 708,520 <br />Total Construction Estimate Otrtien 2: I $ 3,542,600 <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 />Klotz Associates Project No. 0127.011.000 13112-02-00 Drainage Study <br />July 2009 3 of 3 City of La Porte <br />