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BOOK 93 FAGE 20 l prohibited from discharging any runoff in excess of two inches in a 24 hour period, which is the approved IRFWCD discharge rate. In this case, the minimum floor elevation level of service standard applies, since portions of the property lie within a floodplain. Consistent with Drainage Policy 1.2, "all new buildings shall have the lowest habitable floor elevation no lower than the elevation of the 100 -year flood elevation as shown on the Federal Emergency Management Agency's Flood Insurance Rate Map, or as defined in a more detailed study report." Portions of the subject property lie within Flood Zone "A", which is a special flood hazard area located within the -100 -year floodplain. Since no base flood elevations have been determined for Flood Zone A, any development on this property must meet the requirements of LDR chapter 930, which relates the minimum finished floor elevation to the surrounding grade. Besides the minimum elevation requirement, on-site retention and discharge standards also apply to this request. With the most intense use of this site, the maximum area of impervious surface under the proposed zoning classification will be approximately 11110,780 square feet, or 25.5 acres. The maximum runoff volume, based on that amount of impervious -surface and the 25 year/24 hour design storm, and given the. IRFWCD two inch discharge requirement, will be approximately 961,600 cubic feet. In order to maintain the county's adopted level of service, the applicant will be required to retain approximately 526,000 cubic feet of runoff on-site. With the soil characteristics of the subject property, it is estimated that the pre -development runoff rate is 33 cubic feet/second. Based upon staff's analysis, the drainage level of service standards will be met by limiting off-site discharge to the IRFWCD's maximum discharge rate of two inches in twenty-four hours, requiring retention of.the 526,000 cubic feet of runoff for the most intense use of the property, and requiring that all finished floor elevations be consistent with the requirements of chapter 930. As with all development, a more detailed review will be conducted during the development approval process. - Recreation Recreation concurrency requirements apply only to residential development. Therefore, this rezoning request .would not be required to satisfy recreation concurrency requirements. Based on the analysis conducted, staff has. determined that facilities for drainage, solid waste, water,:. wastewater, and recreation have adequate capacity to accommodate the most intense use of the subject property under the proposed -.zoning district. The execution of a.developer's agreement has ensured that adequate road capacity will also be available at the time of development. For these reasons, the concurrency test has been satisfied for the subject request. Potential Impacts on Environmental Qualitv Being a citrus grove, the subject property is a disturbed site. Therefore, no significant.adverse environmental impacts associated with the proposed rezoning are -anticipated. . 44 September 6, 1994 O � �