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n <br /> Contract #99H235 <br /> Amendment #3 <br /> The project promotes flood protection and demonstrates Best Management Practices (BMPs ) <br /> by utilizing wet detention and erosion protection . The project is included as part of the <br /> Indian River County 2020 Comprehensive Plan and has been requested by the Roseland <br /> Property Owner ' s Association . <br /> The design phase is complete , the project has been bid , and Indian River County has awarded <br /> the construction contract . Indian River County owns the property on which the stormwater <br /> detention pond will be constructed . <br /> Estimated Pollutant Load Reduction : <br /> The estimated average annual TSS (total suspended solids) pollutant load reduction is +51 % . <br /> There will be no increase in peak discharge rates for either the mean annual or 25 - year/24 - <br /> hour storm events for the Roseland area . <br /> South Lake <br /> Drainage Basins No . 4C , 8 , 9 , 10 , 11 , 12 , and 14 areas = 80 . 3 acres <br /> Assume 80 % treatment based on 1 inch over drainage area . <br /> 80 . 3 acres x 1 inch x 1 foot/ 12 inches = 6 . 69 ac -ft <br /> Actual treatment Volume (between EL . 15 and 17 . 0) : <br /> ( [ (65 , 760 sf + 118 , 800 sf)/2] x I acre/43 , 560 sf) x 2 . 0 = 4 . 24 ac - ft <br /> Estimated Actual Treatment Efficiency : <br /> 80 % x 4 . 24/6 . 69 = 51 % <br /> IV . Task Identification , Timeframes and Deliverables <br /> Task 1 — Conceptual Design Complete <br /> Milestone : Completion of conceptual design <br /> Deliverable : Conceptual design plans <br /> Task 1 A — Wetlands Mapping Complete <br /> Milestone : Completion of wetland boundary surveys <br /> Deliverable : Aerial map with jurisdictional wetland boundaries <br /> Task 1 B — Final Design Complete <br /> Milestone : Completion of 100 % project design <br /> Deliverable : Final construction project design plans <br /> Task 2 — Land Acquisition Complete <br /> Milestone : Purchase of project detention area <br /> Deliverable : Deed of the property to the County <br /> Task 3 — Construction Dec . 2004 — April 2005 <br /> Milestone : Completion of project and final <br /> acceptance by County <br /> Deliverable : Completed and operational stormwater <br /> detention and treatment system . <br /> Task 4 — Monitoring May — July 2005 <br /> Milestone : Monitoring of influent stormwater and <br /> effluent exiting the detention pond <br /> Deliverable : Water quality data for a minimum of three (3 ) measurable rainfall events <br /> Page 4 of 5 <br />