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40 • Contract #9911235 Amendment #1 EXHIBIT"B — REVISED SCOPE OF WORK ROSELAND AREA EAST''.TORMWATER IMPROVEMENTS PROJECT I. INTRODUCTION: Indian River County is preparing a detailed construction scope of work and permit application for the creation of two wet detention lakes. The South Lake shall be approximately 5 acres providing, treatment for an $0 acre drainage basin with an estimated 72.4% actual treatment efficiency rate. The North Lake shall be approximately 3 acres providing treatment for a 44 acre drainage basin with an estimated 55%a actual treatment efficiency rate. The County has completed surveys of the wetlands limits and a general topography of the drainage area. Preliminary environmental site assessments have been completed, and a tentative acquisition agreement has been reached with the owner of the South Lake property. Conceptual approval on the North Lake location has been granted from the second property owner. Final negotiations are proceedings, and acquisitions are conditioned upon permit approvals. When construction is completed in September 2001, this project shall reduce the nuisance flooding and road access problems created from the overflowing natural slough south of Bay Street. The creation of additional flood storage in two wet detention lakes with the construction of control structures to bleed down the lakes shall improve the quality discharge. 11. WORK DESCRIPTION: DISTRICT's IRL Program has budgeted funding for this project through the Water Management District Trust Fund to be applied towards the construction of two wet detention sites to treat stormwater runoff from the 195 acre basin south of Bay 'Street in northern Indian River County. These wet detention ponds shall be located in upland areas and incorporated into the drainage system to minimize wetland impacts. Inlet structures shall divert water from the natural drainage slough into the adjacent wet detention ponds. Outlet structures with bleed down devices shall return water to a point downstream in tlse slough at a reduced rate. COUNTY's contractor shall be responsible to construct these detention ponds in accordance with DISTRICT and COUNTY requirements. The South Lake shall be approximately 5 acres providing treatment for a 80 acre drainage basin with an estimated 72.4%n actual treatment efficiency rate. The North Lake shall be approximately 3 ,acres providing treatment for a 44 acre drainage basin with an estimated 65% actual treatment efficiency rate. Lash I Final Design, construction documents and permits. The COUNTY shall provide copies of the final design drawings, specifications and construction documents, scope of work, subconlractor sub - agreements, and the M.S.S.W. E.R.P. to the DISTRICT prior to initiating construction activities. Proof of successful land acquisition completion shall also be provided. Paige 3 of 4