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NOV 13 1985 BOOK 62 PAGE 48 --._ The developer, through deed restrictions will preserve approxi- mately 274 ± acres of impounded salt marshes. This area will not be disturbed except for culvert installations at various points to improve water quality and biological productivity by increased flushing. Existing dikes will be used as a nature trail for property owners and on a scheduled basis for Indian River County school children. To further improve the management of the impoundment area, the applicant is proposing to construct a new pumping station with a capacity of transferring 11,000 gallons of water per minute from the Indian River into the mosquito impoundment area. Replanting of wetland vegetation will also be included in several axpas as depicted on the attached application drawings. On December 13, 1984, the Planning & Zoning Commission granted preliminary plat approval to Orchid Isle Estates Subdivision, subject to.the condition that the Board of County Commissioners accept the applicant's $52,500 in lieu of the dedication of five public water access easements at the time of final plat approval. In order for the applicant to receive a land deve- lopment permit and commence construction of the ..subdivision's on-site improvements, permits allowing the."'alteration of wetland areas must be obtained from the DE.R., Army Corps of Engineers, St. John's River Water Management District, and Indian River County. ALTERNATIVES & ANALYSIS: The Planning and Development Division reviews and submits comments on dredge and fill applications to the permitting agencies based upon the following: - The conservation & Coastal Zone Management Element of the Indian River Comprehensive Plan; Coastal Zone Management, Interim Goals, Objectives & Policies for the Treasure Coast Region; - The Hutchinson Island Resource Planning & Management Plan. - The Code of Laws and Ordinances of Indian River County; - Indian River Lagoon Aquatic Preserves Management Plan. The applicant has prepared a management plan for the Pine Island mosquito impoundment (impoundment #6) which will restore a significant amount of its pre -impoundment functions. Reconnecting Impoundment #6 to the Indian River lagoon during the non -mosquito producing season- with culverts will be a significant contribution to the estuarine ecosystem as compared to its present isolated condition. The flapgates to be used (see Map#2, Detail B) also allow tidal intrusion during the mosquito producing season if water levels in the Indian River exceed impoundment water levels. The Indian River Mosquito Control District (IRMCD) will be responsible for impoundment water maintenance. The seasonal flooding regime will be as follows: artificial pumping of estuarine water into the impoundment will cease by September 1. To minimize the release of a sudden surge of impounded water to the estuary, the flapgates will be opened when fall high tides reach impoundment water levels. All culverts will be opened by September 15. 40