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Subtask 7.2 - Develop and Model Preliminary Solutions The Consultant will review the model results to identify potential solutions for predicted capacity deficiencies. Solutions may include upsizing or paralleling existing pipes, upsizing existing pump stations, consolidating flows in new sewers or existing sewers with available capacity, or implementing flow diversions at critical locations. The Consultant will discuss and document these preliminary solutions with City staff and test them out using the hydraulic model. Subtask 7.3 — Evaluate Sewer Rehabilitation Effectiveness and Potential 0 Reduction The City will identify areas of the system that have undergone previous sewer rehabilitation and the locations and dates where City had conducted flow monitoring prior to rehabilitation. Up to three areas will be analyzed to determine the potential effectiveness of previous sewer rehabilitation. Using the hydraulic model, the Consultant will simulate the flows in the current model for storm events that were monitored before rehabilitation and compare the model -simulated flows to the previous flow monitoring data. Based on these comparisons, the Consultant will analyze the data to estimate the 1/1 reductions achieved to the extent that the data supports such an analysis. The Consultant will recommend criteria for selecting sites for future flow monitoring and a methodology for future evaluation of rehabilitation effectiveness through use of flow monitoring and modeling. The Consultant will evaluate the 1/1 flow characteristics associated with the different subbasins in the system (based on model results and flow monitoring data) and their location with respect to identified capacity deficiencies, and identify areas that may be suitable for rehabilitation efforts to reduce 1/1. The hydraulic model will be used to evaluate various scenarios of 1/1 reduction to identify the amount of reductions that would be necessary to eliminate needed capacity improvement projects. Subtask 7.4 - Meeting with Selected City Staff The Consultant will present and discuss information from Tasks 6 & 7. Deliverables: • Maps of model simulation results and preliminary solutions • Meeting agenda, presentation materials, and minutes TASK 8 - DEVELOP CAPACITY RELIEF PROJECTS Subtask 8.1 - Develop and Evaluate Relief Project Alternatives The Consultant will identify specific projects to relieve predicted capacity deficiencies in the sewer system including pump stations. Potential alternative sewer alignments will also be evaluated in cases where existing alignments would be difficult to access or construct. Where existing sewers are identified as capacity deficient, the Consultant will also review available CCTV records to develop viable construction alternatives that will include needed rehabilitation or repair. The Consultant will review potential alignments on aerial photography (e.g., Google Earth) or walk or drive the proposed major project REV: 01-28-19 PR Page 17 of 21 ATTY/AGR.2019.012/Woodard & Curran