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SOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT ENVIRONMENTAL RESOURCE GENERAL CONSTRUCTION MODIFICATION PERMIT NO. 44022269.001 I Expiration Date: August 8, 2010 I PERMIT ISSUE DATE: August 8, 2005 This permit is issued under the provisions of Chapter 373, Florida Statutes (F,S,), and the Rules contained in Chapters 400-4 and 40, Florida Administrative Code (FAC.). The permit authorizes the Pennittee to proceed with the construction of a surface water management system in accordance with the information outlined herein and shown by the application, approved drawings, plans, specifications, and other documents, attached hereto and kept on file at the Southwest Florida Water Management District (District), Unless otherwise stated by permit specific condition, permit issuance constitutes certification of compliance with state water quality standards under Section 401 of the Clean Water Act, 33 U.S.C. 1341. 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: Chasey Lane Townhomes GRANTED TO: Chasey Lane Townhomes, LLC 901 Begonia Road Celebration, FL 34747 ABSTRACT: This permit authorizes the construction of a new surface water management system to serve a proposed multi-family residential development site within a project and total land area of 23.30 acres known as Chasey Lane Townhomes. The project site is located at the southeast quadrant of the Eiland Boulevard and Massey Road intersection within the City of Zephyrhills, in southeast Pasco County, Adjacent permitted projects include Silver Oaks Village - Phase" (Environmental Resource Permit [ERP] No. 44001102.009) to the northwest. The project is located within a hydrologically closed drainage basin. However, the stormwater management system has been designed for total retention of the 100-year, 24-hour rainfall event of 12,00 inches. The project involves five distinct drainage basins in both the pre- and post-development conditions. The Engineer of Record used the Soil Conservation Service Type II Florida Modified rainfall distribution and a unit hydrograph shape factor of 256 to generate flood hydrographs for each individual basin. There are pre-treatment swales which discharge into Pond 2 (Basin H) through three identical control structures The drainage computations submitted by the Engineer of Record indicate no off-site discharge from either pond in storm events up to and including the 100-year, 24-hour rainfall event The project site is not located within a floodplain as indicated by Federal Emergency Management Agency FIRM Community Panel 120230 0005C. However, the project engineer has prepared a flood study which established the 100 year, 24-hour peak stages in Sub-basin C and Sub-basin H. The project engineer has provided stage-storage calculations which show the project will result in flood storage encroachment of approximately 3.74 acre-feet in Sub-basin C and approximately 1.51 acre-feet in Sub-basin H. These losses will be mitigated by creating approximately 7,77 acre-feet of compensatory storage in Pond C-1 and approxim2!e!y 603 acre-feet of compensatory storage in Pond H-2. This is consistent with the requirements of Part B, ERP Infonnation Manual, Section 4.4. No adverse off-site or on-site water quantity impacts are expected, The project contains a 0.41-acre isolated wetland. Project construction will result in the filling of 0,10 acre of wetland, Under the ERP Basis of Review (Subsections 3.2.2,1 and 32.22) no significant habitat is provided by this wetland, therefore, no habitat mitigation will be required