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confirmatory efforts to verify that adequate surface water supply is available and seasonally reliable to supply the project. This may require surface water and/or STELLA modeling at a later stage. No such efforts are included in this Scope of Services. Similarly, no water balance will be prepared as part of this effort, but may be required during the formal design phase. Consultant will use historical pumping records and Osprey Marsh operating data to determine how best to transfer the water currently being treated and stored on the Osprey Marsh site over to the proposed reservoir site. A conceptual site plan will be provided in the summary report (Task 7.0). Due to the time and budget restrictions outlined by County staff, no design documents (plans or specifications) will be prepared as part of this task. Subtask 5.2 Surface Water Treatment Plant The previous North County Reservoir Feasibility Study, referenced throughout this Scope of Services, included an opinion of probable cost for a 7.5 mgd maximum daily flow surface water treatment plant (treat 5.0 mgd average daily flow). Since the treatment capacity is similar to that used in the prior study, the Consultant will build upon the opinion of probable cost previously provided. Specifically, the Consultant will include an estimated land requirement that would be required to construct the 7.5 mgd MDF WTP and determine if the available acreage at the neighboring South County WTP property would be sufficient for co -location. No additional services are included for site selection of the South County WTP site if determined to be insufficient. Consultant will rely on the operating data from Osprey Marsh to refine the treatment assumptions made when preparing the previous opinion of probable cost, and will adjust the estimate accordingly. This effort will assume that the existing ground storage tanks (and an additional, if necessary) will serve as blending tanks to comingle the membrane treated UFA water with the surface water treatment plant water, prior to distribution to customers via the existing high service pump station (no modifications/changes/additions included) and distribution system. TASK 6.0 ENGINEER'S OPINION OF PROBABLE COST Consultant will prepare an opinion of probable cost for the proposed reservoir based on the information gathered in the aforementioned tasks. In addition to past project experience, Consultant shall apply unit costs obtained from previous St. Johns River Water Management District (SJRWMD) and South Florida Water Management District cost guidance documents in development of the conceptual capital cost estimates. The opinion of probable costs will include: • Design fees; • Permit application preparation/fees; • Construction of piping (from Osprey Marsh to the reservoir and from the reservoir to the proposed WTP); • Construction of the reservoir Construction of the proposed surface water treatment plant (to be located on the existing South County WTP site; no land acquisition costs included); and • Annual operations and maintenance costs. This effort will assume that all intake pump stations associated with moving water from the South Relief Canal to Osprey March and subsequently to the reservoir itself are sufficiently sized. No additional pump stations will be included for raw water intake. If it is determined that pumps are required to A-4 81778.docx