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rbEc- i T982 Southeast Enterprise November 19, 1982 Page 2 ALTERNATIVES AND ANALYSIS: (Continued) 900K 2 Fr, , 5 Drainage - Discussion of drainage factors in the subject property consists of two major areas. 1. Existing natural drainage within the Environmentally Sensitive area. 2. Drainage requirements of proposed development of the subject property. The plant community in the Environmentally Sensitive areas are dependent upon a direct exchange of water with the Indian River. The Department of Environmental Regulation (DER) in*their review of the applicant's Binding Letter of Interpretation have expressed concern about this water exchange of the Environ- mentally Sensitive area and the Indian River. Upon submission of a detailed drainage plan, either through the development of regional impact (DRI) process or during site plan review, the applicant may be required to enhance this flow and exchange process in the wetlands area. It might be.noted that the flooding of the dikes has also been used as a mosquito control technique for the area. The Mosquito Control District does not have a dedicated easement to this area. It is staff's understanding that these activities have been handled through "a gentlemen's agreement".: It is likely that during any site plan process, a permanent easement would be required of the applicant. Any proposed development would be required to submit a drainage plan which conforms to the requirements both of the Indian River County Stormwater Management and Flood Protection Ordinance and the requirements of the Florida Administrative Code 17-25. Further, the Comprehensive Plan prohibits direct point discharge into the Indian River. The requirements of these ordinances and the Comprehensive Plan will assure pro- _ tection of the wetlands area, as well as adequate on-site drainage for any proposed development. Flood Hazards - Approximately 100 acres of the eastern portion of the subject property lies in Flood Zone "A-10". This flood district requires floor areas for living elevations whicb must meet or exceed standards of 6 feet above mean sea level. Soils - The site contains four major soil types: Myakka Fine Sand, Pomello Fine Sand, Jupiter Fine Sand and Typic Hydraquent. These soil associations have moderate to severe.limitations for septic systems and percolation. Their permeability and other characteristics will be a consideration in the development of any sewer system, drainage system and/or percolation ponds. Indian River - The waters of the Indian River are a part of an Aquatic Preserve established by the Department of Natural Re- sources (DNR) under provisions of Chapter 258.39 [8l (Florida Statutes) This Aquatic Preserve begins at the southern boundary of the City of Vero Beach and includes all waters to the County line (Chapter 258.39). The Environmentally Sensitive area of the subject property in- cludes.7.0 acres of submerged land in this aquatic preserve. On April 14, 1964, the Florida Trustees of the of the Internal Improvements Fund, established under Chapter 258, approved the conveyance of these 7.0 acres to J. L. Rogers .2 The Indian River County Property Appraiser's Office indicated that these 7.0 acres are listed on their current tax rolls. Other parcels to the south appear to include submerged lands, according to County tax maps. 2 Confirmed by Dan Micuser, Title Division Department of Natural Resources.