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Recommendation: It is SBS recommendation that IRCDUS plan to construct facilities that will provide for the future demand of at least 3.116 MGD of reuse water to the North Barrier Island. This flow allocation is depicted and listed in Scenario C in the Hydraulic modeling and is summarized as follows: -1.964 MGD - flow to north barrier island communities within IRCDUS service area -1.0 MGD - to JI -0.153 MGD - to COVB service area - the Shores and River Club 3.116 MGD total Two system models (C-2 and C-3) that were proposed with this flow allocation are favorable 1. With storage and pumps: These flow allocations have been modeled and results indicate that the allocated flows are provided with consistently high pressures with the storage tank and pump capabilities (system model C-2). 2. Without storage and pumps: While pressures drop up to 30+- psi at the furthest demand nodes, the same flows can be provided without the tank and pump (system model C-3). This may not be a desirable long-term solution. The burden will be on the Hobart tank and pumping facilities to provide pressurized reuse water to the developments/ communities on the barrier island without a backup or fail safe that the proposed Sea Oaks 3.0 MG Reuse water storage tank provides. The improvements can be phased utilizing both system models C-2 and C-3:. o Phase 1: Limit the construction to just transmission ain and distribution main system components (the pipe network) of system C-2 (and as provided in C-3). o Phase 2: construction of the 3.0 MG reuse storage nk and pumping facilities. IRCDUS will monitor the future growth of the reuse water de a d and decide when to implement Phase 2. 'Ts The specific system recommended are the systems 'tied in C-3 and C-2, implemented as a phased project. The system consists of the lowing. • Phase 1 (system C-3): All reuse to the barrier island is fed front o`bartTank and pumps. There is not a new tank or pumps at Sea Oaksthi tim=. Existing 16" transmission line on CR 510 to A -1- A, which feeds the existi Windsor, and feeds both a new 16" line and existing 8" line south to Sea o - s par .lel mains). These parallel lines feed into a new 12" line that runs fro, Oaks soarto Old Winter Beach Road. • Phase 2 (syste From the Hobart <a�nn and pu ps, an existing 16" transmission line runs on CR 510 to A- 1 -A, which feeds an=Zistir8" line north to Windsor (and Orchid) and feeds a new 16" line south to Sea Oak where reuse will be stored in a new tank (3 MG). A new pump facility will pump the reuse water into the distribution lines, including an existing 8" line which runs north to Disney, and a new 12" new line which routes south to Old Winter Beach Road to feed JI, the Shores and River Club. System C-2 is recommended as a final solution because: • It provides high and consistent pressures throughout its service area. • It relies on the Hobart tank and pumping facilities to deliver pressurized water to Orchid/ Windsor (1.369 MGD), which reduces the volume of reuse water going to and pumped from the new Sea Oaks reuse storage tank and pumping facility to only 1.607 MGD. • The 3.0 MG tank will provide ample storage and buffer for a system with tank capacity at 188% of daily flow (*recommended min. storage capacity is equivalent to 100% of daily flow requirement; Dept of Army — Tech manual no. 5-813-4). • 1.607 MGD flow requires a min. 1115 GPM pump capacity (ADF). SBS recommends that the pumping facility mimics that at the existing Hobart reuse storage tank and pumping facility. This system has (1) 250 gpm (at 195 ft.) jockey pump and (3) 850 gpm (at 195 ft.) service pumps. The system is designed to have any two of the three 850 gpm pumps in operation at one time, with a total capacity of 1700 gpm (2.4428 MGD ADF). The additional pump capacity (1700 gpm vs 1115 gpm) provides a buffer for any unanticipated peak demands caused by multiple irrigation systems unexpectantly running simultaneously • The system can provide additional capacity (up to 3.505 MGD - reference model D-2151 1.1