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SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT ENVIRONMENTAL RESOURCE STANDARD GENERAL PERMIT NO. 4413839.00 I EXPIRATION DATE: January 8, 2001 t PERMIT ISSUE DATE: January 8, 1996 This permit, issued under the prov~s~ons of Chapter 373, Florida Statutes and Florida Administrative Code Rule 40D-40 authorizes the Permittee to perform the work outlined herein and shown by the application, approved drawing(s), plans, and other documents, attached hereto and kept on file at the Southwest Florida Water Management District (District). All construction, operation and maintenance of the surface water management system authorized by this permit shall occur in compliance with Florida Statutes and Administrative Code and the conditions of this permit. PROJECT NAME: Dawson Sport Aviation GRANTED TO: City of Zephyrhills 5335 8th Street Zephyrhills, FL 33540 ABSTRACT: This permit is for construction of a new surface water management system to serve a 3.10 acre sport aviation facility. The proj ect site lies within the confines of the Zephyrhills Municipal Airport complex. Adjacent properties include an athletic field to the southwest and a golf course to the south. The project is located within a hydrologically open drainage basin. Consistent with Chapter 40D-4, F .A. C., water quantity requirements, the principal design storm was based on a 25-year, 24-hour rainfall event of 8.5 inches, for peak discharge attenuation. The project engineer used the SCS Type II Florida- modified rainfall distribution and a unit hydro graph shape factor of 256 to generate flood hydro graphs for the project. The project site presently involves one distinct drainage basin. Project runoff will be discharged to the adjacent Airport Drainage Ditch. The proposed surface water management system will be comprised of one excavated on-line detention pond. The pond will be equipped with a discharge structure which has been sized to attenuate post-development peak discharges from the design storm. There is no riverine floodplain within the proj ect limits. No net loss of effective historic site storage is expected. No adverse off-sitejon-site water quantity impacts are expected. Compliance with Chapter 40D-4, F.A.C., water quality requirements is assured, as the on-line detention pond has been sized to retain arid infiltrate the runoff from one inch of rainfall, in no longer than 72 hours. The Directly Connected Impervious Area concept was accordingly used to quantify the water quality treatment volume. The pond's discharge structure will be equipped with a skimmer to ens~re that floating pollutants are not discharged to the airport drainag~ ditch. No adverse on-sitejoff-site water quality impacts are expected. There are no wetlands within the project limits. The surface water management system will be maintained and operated by the Permittee. The required legal documents for this entity are part of the File of Record for this project. No objections to this permit application have been filed at the District office to date.