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• 40 0 J CALPTNE EASTERN August 25, 2000 James W. Davis, P.E. Public Works Director Indian River County 1840 25th Street Vero Beach, FL 32960 Subject: Hydrodynamic Computer Stormwater Model Dear Mr. Davis: 'ER'II 1111BAN CENIRE 4fl411 N't:.ti'I' KENNEDY BIND. til'I I E 61N1 I VNIPA. FLORIDA 3:1699 AUG 2 8 2000 PUBLIC to DEPT As we are aware, the Indian River County Master Stormwater Management Plan is currently under development and will address the necessity and desirability to reduce the flow of fresh water flow and pollutant loading from upland runoff into the Indian River Lagoon. This Master Stormwater Plan covers the east Indian River County -Indian River Lagoon watershed located between the one mile Atlantic Coastal Ridge and the ten mile Atlantic Coastal Ridge which discharges 100 million gallons of water per day into the Indian River Lagoon. Calpine Corporation (Calpine) is developing the 1080 MW Blue Heron Energy Center (Blue Heron) in Indian River County. This electrical generating facility will require approximately six to eight million gallons of water per day for cooling purposes, which is approximately 6% to 8% of the total discharge from the aforementioned watershed. The Blue Heron water team, including representatives of Indian River County (County), the City of Vero Beach (City), and the Indian River Farms Water Control District (Water Control District), working in close coordination with the St. Johns River Water Management District (SJRWMD), has developed the water supply plan for Blue Heron. The water supply plan is based on the withdrawal of storm water from the Water Control District canal system to be utilized at Blue Heron for cooling purposes. The overall objectives of providing cooling water to Blue Heron Energy and reducing the flow of fresh water into the Indian River lagoon align very well, both of which will be addressed via the Blue Heron water plan. Calpine is in the process of preparing the water budget for Blue Heron and performing the computer aided hydrodynamic stormwater modeling. 'The scope of the Calpine modeling effort will address the needs and concerns of Indian River County, Indian River Farms Water Control District, the City of Vero Beach and the St. John's River Water Management District regarding a reduction in the flow of fresh water into the lagoon, while focusing on the objectives of providing cooling water to Calpine's Blue Heron Energy Center. The modeling effort will be completed by December 31, 2000 to support the development of the Master Stormwater Plan in accordance with the schedule established by the SJRWMD. A Modeling Working Group (MWG), composed of representatives of CALPINE/Environmental Consulting & Technology, Inc. (ECT), the CITY, COUNTY WATER CONTROL DISTRICT, and SIRWMD, will be assembled to