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tanks). The neighborhood south of 71h Street SW, while connected to the County water supply system, remains on septic tanks. Therefore, the storage reservoir proposed for the subject property would have to be located 200 feet or more from the nearest drain field. As currently presented in Figure 2-1, the reservoir is approximately 178 feet from the nearest drain field. A variance from the DOH would be required to construct the reservoir as shown. Otherwise, the southern berm location would have to be shifted to gain the additional 22 feet of separation thereby losing available storage volume within the reservoir. In addition to the 30 foot ROW dedication along 7th Street and 10th Avenue SW, a 25 foot Type B buffer will be required for the site. The existing pine scrub vegetation can remain to form the buffer but this will need to be in place prior to the start of the support berm needed to hold the reservoir water. In short, a gross footprint area of around 68 acres is thus reduced to an approximate 48 acres of reservoir space. In addition, County LDR requirements state that 15% of the upland portion of the site be maintained as uplands conservation. Less the 10.6 acres of potential wetland area leaves 73 acres of upland which calculates to 10.95 acres of space required for conservation. Due to the unique nature of the site, the southern "fingers" could be used to satisfy this requirement. Figure 2-1 depicts the conceptual layout of the reservoir system with the required ROW allocations, buffer setbacks, berm, reservoir footprint and associated conservation areas. To the west of the site is the Osprey Marsh Algal Turf Scrubber System and the South County Water Treatment Plant. Figure 2-1: Conceptual Layout -South County Reservoir Site, 925 5th Street SW -vc c. ,�'r cc:-:ur �• — --- ) ' - I - `-.•.- av: WE lhi: FE`.a F'J7D.tl+l SLFFa[F 1 FLY- SUW4 _ Jr - � f ®x \` .-A K &14A e:¢a IC ERIL / •r - —TMJ 1�� I qEF FE-E:/.W+ lC 4TE0.4L': J r} P - sraTl i I 50. CA44T , t 7n1 i --:,T, WFC ar_rpfl'E., :•. _ �-- /:P TI L 54 LEGEND •�..• :;;Tx .E WE CF1:-W '��•:u•C: i ' } 1 ' �`4 / I 11 Ttt2 9 IaCY_a� ' ' 1 , r •` :J' WLE :.¢Fax Lft.M (:C ''AWLES; - :• GOYa W, r.Fa:EL V240;a,:E =VdUM FEV. r i ' y,>E r eE x+.acJ "Sim xcru•.x Faa :CtX •SE S• •1 :::ti`��; POtflll.G Y::iiHr UES vC. s„ S tr C_��\� J,r MI11Y Ea�flE.T 1 i D� Figure No. 2-1 C SDMConceptual Layout of the South County Reservoir Site. Oslo Road, Indian River County mithFEB 2e 6 J•\Utilities\UTILITY - Engineering\WATER\Alternative Water Supply\Portofino Preserve aka Blackstone 83 acre site\Due Diligence Report for BCC 02_16_2016\Agenda - Due Diligence Report and OPC for 83 acre site for BCC meeting 02_16_2016 v2 cmc.docx 'Page 9 of 14 107