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Camp Dresser & McKee Inc., on behalf of Indian River County,. has submitted an application requesting major site plan and special exception use approval to construct an expansion to the Indian River County Central Region Wastewater Treatment Plant looted at 3550 49th Street. Since the site is looted within the RMH-6 (Residential Mobile Home) zoning district, and since the proposal would expand an existing heavy utility plant fitcility by more than 100/6, special exception use approval must be granted for the project. The existing plant facility has a design capacity of 1.0 million gallons per day (mgd). The associated major site plan and use request propose a 3 phase expansion that will include the addition of support buildings, equipment, and site improvements to increase the capacity of the plant to 5.0 mgd. At its August 28, 1997 meeting, the Planning and Zoning Commission voted 7 to 0 to recommend that the Board of County Commissioners grant special exception use approval. The Board is now to approve, approve with conditions, or deny the special exception use request. Pursuant to Section 971.05 of the LDRs, the Board is to consider the appropriateness of the requested use for the subject site and surrounding area, and may attach any conditions and safeguards necessary to mitigate impacts and to ensure compatibility of the use with the surrounding area. The Planning and Zoning Commission staff has reviewed the submitted proposal and has granted major site plan approval subject to the Board of County Commissioners granting special exception use approval and any conditions that may be attached to that approval. Therefore, the major site plan approval will become effective if and when the Board grants special exception use approval. ANALYSIS• 1. Zoning Classification: RMH-6, Residential Mobile Home (up to 6 units/acre) 2. Land Use Designation: L-2, Low Density 2 (up to 6 units/acre) 3. Surrounding Land Use and Zoning: North: VacanVA-1 South: Mobile homes/RMH-6 East: Lateral "H" canal/RM-6 West: Vacant/A-1 4. Overall Site Area: 13.09 acres 5. Area of Development: 8.04 acres 6. Building Area: Existing: 8,178 sq. ft. Proposed Addition: 5.212 so. ft. Total at End ofProject: 13,390 sq. ft. 7. Impervious Surface: Existing: 351,230 sq. ft. Proposed Decrease: 54.991 sq. ft. Result: 296,239 sq. ft. 8. Open Space: Required: 35% Provided: 48% Existing: 218,970 sq. ft. Proposed: 273,961 sq. ft. (net increase of 54,991 sq. ft. of open space) Note: The removal of 204,000 square feet of existing percolation ponds in phase I accounts for the net increase in open space and decrease in impervious surface area. 9. Phasing. The existing plant facility has a design capacity of 1.0 million gallons per day (mgd). Phase 1: Increase plant capacity to 2.0 mgd with the addition of hardworks structure, two aeration basins, two clarifiers, two filters, two disinfection basins, a sodium hypochlorite building, and an electrical/lab/office building. Phase 11: Increase plant capacity to 3.0 mgd with the addition of a clarifier, filter, and an efficient storage holding tank- Phase ank Phase III: Increase plant capacity to 5.0 mgd with the addition of one aeration basin, one clarifier, and one filter. SEPTEMBER 16, 1997 19