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• <br /> . <br /> 8. To prioritize the use of the available modeling budget, feasible modeling flow and volume <br /> - validation parameters will be defined based upon observed system performance and -- <br /> available flow data. These feasible validation parameters will be discussed with the City and <br /> defined as part of the modeling plan. <br /> 9. Perform a long-term analysis for the combined system using long-term continuous rainfall <br /> event established in Task 600 to establish the current LOS for all combined sewer basins <br /> and identify the design storms that will be used for alternatives analysis. <br /> 10. Perform modeling analysis to evaluate deficiencies and alternatives for the combined and <br /> separated systems defined in Task 900 using the design storms identified in Task 600. To <br /> conserve modeling budget, modeling of separated sewer basins will be prioritized based <br /> upon the risk register developed in Task 200 and the Task 400 I&I data review. <br /> 11. Perform modeling analysis to determine the impacts of the new service areas defined in <br /> Task 1100. <br /> 12. Provide quality control reviews periodically through the model update and analysis process. <br /> Major quality control reviews will take place at the following modeling milestones: <br /> A. Completion of model construction/update <br /> B. Completion of model validation <br /> C. Alternatives analysis <br /> 13. At the end of the project, conduct a model workshop to hand over model files and instruct <br /> City staff on how the model has been configured, as well as how to run the model for future <br /> analysis. <br /> City Responsibilities <br /> 1. Provide existing sewer system model file(s). <br /> 2. Provide background system GIS data and shape files. Data include, but is not limited to, <br /> parcels, streets, water features, land use/zoning and contour. <br /> 3. Provide access to applicable sewer flow data. <br /> 4. Provide access to record drawings or other sewer system data needed to update the sewer <br /> model(s). <br /> 5. Update infrastructure added since the model was created—pipes, manholes, pumps & <br /> pump parameters, regulators, and other structures. Integrate GIS updates into the model <br /> and make needed corrections to the sewer geometry. <br /> 6. City staff will work with HDR to help identify which model alternatives to be evaluated. <br /> 7. Review and provide comments on the Modeling Plan. <br /> 8. Attend the modeling workshop. <br /> Assumptions <br /> 1. To preserve budget for high priority areas, not all separated sewer basins will be modeled in <br /> detail. The focus of the modeling effort will be driven by results of the risk register <br /> development in Task 200. <br /> City of Everett Comprehensive Sewer Plan Update 1S3 Scope of Services April 2011 <br />