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December 2015 FLORIDA DEPARTMENT OF ENVIRONMENTAL PROTECTION 14-14979 RESPONSES TO COMPLETENESS COMMENTS FPL OKEECHOBEE CLEAN ENERGY CENTER SiTE CERTIFICATION APPLICATION As shown oil Figure 4 5-1, the average waste water flow is 1,333 gpm (1 92 MGD), the nlax month average flow is 1,617 gpm (2.33 MGD) and the peak now is 6,025 gpin (8 68 MGD) IRC-8. Figure 8 under Appendix 10.9 should be extended to show the impacts of the l- foot drawdown contour. RESPONSE: The 1-foot contour on Figure 8 illustrates the cumulative impact of all users in the model area, which extends model-wide beyond the area of OCEC Unit 1 Figure 7 shows the drawdown impact due to OCEC withdrawals out to the 0 5-foot contour IRC-9. Also, if the 1-foot drawdown contour is to extend beyond the ECFS groundwater model, is it accurate to only use the subject model or should it be combined with the SEC model (which covers the east portion of Indian River County)? RESPONSE: The impact of OCEC Unit 1 is well within the boundaries of the ECFS model. There is no need to combine the ECFS and the SEC models to evaluate the impacts of the Project; in accordance with coordination between FPL and SJRWMD. TRC-10. When firing 1JLSD oil, when natural gas is not used, emissions of NOx will be controlled using water injection and SCR. How much additional water (process or treated) will be used in this effort? RESPONSE: The amount of water required for NOx control when ultra-low distillate oil (ULSD) is used depends upon the load of die combustion turbine (CT) and ambient temperature At an ambient temperature of 75° F. which is about equivalent to the annual average, approximately 470 gallons/minute is required for each CT at 100 percent load ULSD will only be used as a backup fuel, limited to no more than 500 hours/year per CT The water use when using ULSD for 500 (tours per year is included in the water balance shown in Figure 4 5-1 IRC-11. "A supplemental SCA describing the solar facility layout, engineering design, drainage system, and construction specifications would be submitted prior to development of the future solar generation area of the Site." How much process/treated Rater, if any, will be used in the future solar panel array for cooling? if water will be used, will this future additional water be factored into the CUP allocation being requested now? RESPONSE: FPL is not seeking a separate consumptive use permit for the OCEC Project. Rather, pursuant to Section 403 511(1), Florida Statutes, the certification will constitute "the sole license of E the state" for the construction and operation of the plant and associated facilities. Impacts, including potential water use associated with potential future solar generation on the Site, would be addressed in a supplemental site certification application under Section 403 517, Florida Statutes. Please note, however, that solar photovoltaic technology does not require cooling water No process/treated water will be used in the potential future solar facility for cooling. i IRC-12. Cooling Towers a) Cooling tower bactericides used in controlling microbial growth in the draft cooling tower should be evaluated to take into account drift that may affect neighbors, cattle, drivers on SR60,and visitors to the Fort Drum conservation area. b) Cooling towers, evaporative condensers, and fluid coolers use a fan to move air through a recirculated water system. This allows a considerable amount of water vapor and sometimes 12 Attachment 3 213