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In preparing the site master plan and strategy for initial plant improvements, up to three <br /> alternative concepts will be developed for consideration by Indian River County. These <br /> alternative concepts will be presented at a project review meeting (Task 1 ) to allow input <br /> from County staff. Following this input, the alternative concepts will be evaluated and a <br /> recommended approach presented to County staff at a subsequent project review meeting. <br /> Subtask 5 .3 — Preliminary Design of Initial Plant Improvements . Perform preliminary <br /> design of the recommended improvements to increase AADF capacity at the North <br /> Regional WWTF to 2 mgd. This will include additional B1oWiri modeling for process <br /> design, hydraulic modeling through the various unit processes to create a hydraulic profile, <br /> and other calculations to determine sizing of structures and mechanical equipment such as <br /> blowers, piping and pumps . For all unit processes, prepare a detailed basis of design, <br /> defining the design criteria to be applied during detailed design . Also define applicable <br /> regulations and codes affecting the basis of design . <br /> Subtask 5 .4 — Preliminary Engineering Report. Prepare a PER summarizing the work <br /> performed in Tasks 2 through 4 and Subtasks 5 . 1 through 5 . 3 above . The PER will consist <br /> of the following: <br /> 1 . Population and land use projections for the North Regional WWTF wastewater <br /> service area . <br /> 2 . Wastewater flow projections and characteristics . <br /> 3 . Summary of the process design including: <br /> a . Design criteria. <br /> b . Expected dimensions of unit operations and processes , capacities and <br /> volumes . <br /> C, Process configurations . <br /> d. Hydraulic profile through the plant. <br /> e . Organic and solids loadings to each unit process . <br /> f. Process flow schematics and instrumentation diagrams . <br /> 4. Technical information and design criteria for treatment facilities , including: <br /> a . Hydraulic and organic loadings - minimum, average, and maximum for each <br /> liquid and solids treatment process . <br /> b . Provision for flow metering and sampling throughout the plant. <br /> c . Recycle flows within the plant. <br /> d. Chemical addition facilities , including disinfection . <br /> e . Summary of treatment performance for each unit process with supporting <br /> data or design calculations . <br /> f. Documentation supporting chlorine doses and residuals and contact times <br /> used as the basis of design , if chlorine is used for disinfection . <br /> 5 . Site plan illustrating proposed facilities and unit processes; 100-year and 25 -year <br /> flood elevations ; approximate finish elevations for all major treatment units and <br /> pumping stations ; and a stormwater management plan . <br /> S: A047077\ IRC North Regional WWIT Expansion\Exhibit A_revl .doc <br />