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Exhibit B AtkinsRealis Cost Detail Work Order No. 10 ASSUMPTIONS AND EXCLUSIONS The following assumptions have been made in the development of this scope of work, schedule, and fee: 1. Subsurface utility engineering, geotechnical services, environmental assessments, and survey services are not required. 2. Neighborhood and community meetings are not anticipated or included. 3. Permitting is not required for this study. 4. The conceptual design will be based on the federal, state, and local codes and standards in effect at the start of the project. 5. IRCDUS will provide requested information and project reviews in a timely manner. 6. Attendees of the review meetings are designated as decision makers. 7. The County's Hydraulic Modeler will provide potable water demand patterns in the area and collaborate with AtkinsRealis on the determination of flow rates and proposed options for the anticipated collection system. 8. Any improvements to the existing collection system that are needed for acceptance of the additional flow from the conversion areas that have been or will be developed by the County's Hydraulic Modeler, will be communicated to AtkinsRealis and IRCDUS by the County's Hydraulic Modeler on completion of Task 03 according to the proposed schedule. 9. The project schedule and feasibility level estimates are intended solely for planning purposes and exclude escalation factors over time intervals. 10. IRCDUS will contract separately with the Hydraulic Modeler. 11. The County PM will verify the availability of County Staff to attend meetings and workshops as well as provide timely requests for rescheduling as needed. Attendees of the review meetings are designated as decision makers. 12. Lift station and treatment facility design calculations are excluded. 13. Laterals to existing and proposed homes and developments will be included as a line item within the feasibility level estimate but excluded in schematic design. 14. Costs, schematic design, and evaluation of annexed areas and developer projects, both current and future are excluded. 15. This scope of work will not include priority phasing of conversion areas. 16. This scope excludes design, costs, and scheduling for water distribution to conversion areas requiring water service. It is assumed that water distribution to conversion areas is being evaluated in the County's Master Plan (in development at the time of this proposal). If available, the County's Hydraulic Modeler will provide this information to AtkinsRealis for incorporating with the feasibility study. City of Sebastian Buildout of Septic to Sewer Conversion Feasibility Study Page 7 of 12