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Exhibit B Cost Detail Work Order No. 10 AtkinsRealis flows, develop tables, define limits of septic to sewer conversion areas, and develop schematic designs of the collection system. Deliverables: Compiled geodatabase of relative information, summary of permitting and regulatory requirements TASK 03 Define Flow Rates The conversion from septic to centralized sewer systems will increase sanitary flows, creating a need for infrastructure improvements. Proper sizing of the sewer collection system will ensure that the system is adequately sized to handle the projected flows, minimize risks of overflow and inefficiency, and provide for long-term sustainability and regulatory compliance. This task involves calculating the cumulative flows from each user, overall and by area, and then designing schematic sewer systems to convey those flows to the receiving facilities. Based on the information provided by the County and the Master Plan team AtkinsRealis will conduct a thorough assessment of the project area, including factors such as zoning, topography, flooding and storm surge that will impact the schematic design. AtkinsRealis will coordinate with County Staff, including the assigned project manager and GIS Manager, and with the County Hydraulic Modeler in relation to the Wastewater Master Plan under development to ensure the conversion areas and schematic design is consistent with proposed capital improvement projects. Deliverables: Projected flow rates and preliminary sewer network layout TASK 04 Hydraulic Modeling Coordination AtkinsRealis will coordinate with the County's assigned Hydraulic Modeler to evaluate the proposed schematic designs. This analysis will determine the feasibility of integrating the proposed improvements into the current wastewater system. AtkinsRealis will support the County's Hydraulic Modeler in implementation of the septic -to -sewer conversions, and review recommendations for changes in the schematic design. The County's Hydraulic Modeler may determine that improvements are needed in the existing collection system to accept the flows from the proposed septic to sewer conversion. Upon County acceptance, recommendations on improvements to the existing system from the County's Hydraulic Modeler will be incorporated into the schematic design. Areas will be evaluated for water service requirements where sanitary connections are to be provided. AtkinsRealis will coordinate with the County's Hydraulic Modeler who will provide water distribution extensions to these areas. The County's Hydraulic Modeler will provide this information in GIS format to be included with the compiled geodatabase and noted in the study. Deliverables: Summary of hydraulic model results and upgrades to the existing system. City of Sebastian Buildout of Septic to Sewer Conversion Feasibility Study Page 5 of 12