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40 4b Contract #SD624AA EXHIBIT "A" — SCOPE OF WORK DEVELOPMENT OF THE EAST INDIAN RIVER COUNTY STORMWATER MANAGEMENT PLAN FOR THE WATERSHED WITHIN THE INDIAN RIVER FARMS WATER CONTROL DISTRICT I. PROJECT SUMMARY This project will prepare a master stormwater management plan for the east Indian River County -Indian River Lagoon (IRL) watershed located between the one mile Atlantic coastal ridge and the 10 mile Atlantic coastal ridge (I-95) within the Indian River Farms Water Control District (IRFWCD). This work accomplished under this agreement (and initial funding) will focus on the 21,720 -acre watershed area of the Main Canal basin and 20,000 acre South Relief Canal basin within the water control district. i The purpose of this scope of services is to outline the major components required to develop a stormwater master plan for the described project area. This master plan will include alternatives for providing improvements to water quality and flood control within the watershed, natural and recreational areas which may be incorporated into regional retention areas, water reuse, and related public education and information needed for a National Pollutant Discharge Elimination System (NPDES) compliance program. This project will address the problems, which impact the quality of the IRL system. The highest pollutant loadings in the South Central IRL segment occur in the IRFWCD sub -basins, due to the characteristics of this urban built -out area which utilizes extensive ditching and canal systems draining to the Lagoon. Excessive fresh water/untreated stormwater runoff is discharged from the watershed into the surface water ecosystem. This excessive slug of freshwater reduces salinity in the lagoon, causes siltation of seagrass beds, and pollutes the estuarine environment. The classification of the receiving water body is Class III —Waters of the State near the Vero Beach area and Florida Outstanding Waters. Hydrologic and hydraulic design alternatives recommended for stormwater storage, flood attenuation and treatment for water quality will strive to achieve, where feasible, a 50% or greater reduction in pollutant loads to the IRL and a significant reduction of fresh water discharges will be targeted. II. GENERAL DESCRIPTION OF PROJECT Between the one mile Atlantic coastal ridge and Interstate I-95 (Ten Mile Ridge) within Indian River County lies the IRFWCD (Chapter 298, Fla. Stat., Drainage District) watershed area. This approximate 50,000 acre watershed includes almost all of Township 33 South, Range 39 East; Sections 4-9, 15-22, 27-35 in Township 32 South, Range 39 East; and Sections 1-5, 9-15, 22-27, 34-36, in Township 33 South, Range 38 East (see attached map labeled Exhibit "A" and "A-1"). IRFWCD's boundaries extend from CR 510 in Wabasso at its northern extent to 112'h Avenue in Vero Beach at the western extent and 25`h Street SW, the boundary of St. Lucie County, at its southern extent. The one -mile coastal ridge provides the eastern extent of IRFWCD's boundary. The IRFWCD is a long established Chapter 298 drainage district in Indian River County, incorporated in May 1919. IRFWCD's primary concerns are drainage, water conservation, Page 10 of 19