Agmt19 Aecom Technical Services, Inc.

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Appendix 5: Utilities Evaluation Page 17 that are assigned to pipelines within the Project area in the hydraulic model should be adjusted based on the calibration results. If the pipeline roughness coefficients in the Project area need to be adjusted, Consultant will use the field data to determine the roughness coefficients. Results of the calibration will be presented in the report. The final calibrated hydraulic model will be submitted to the City as an EPANET file. • Perform Hydraulic Evaluation for Maximum Day Plus Fire Flow Conditions: Conduct a fire flow analysis to determine available fire flows in the project area under existing conditions (existing conditions in the current water system hydraulic model) and for water system buildout conditions with the Project demands. Fire flow requirements will be provided by the applicant based on the Redwood City Fire Department. If available fire flows at buildout of the system are less than the required demand with the Project demand included, Consultant will identify potable water system improvements within the project area to meet fire flow requirements. Consultant will prepare a map showing pre- and post -project fire flow rates at each hydrant in the project area. • Perform Hydraulic Evaluation for Normal Operations, Peak Hour Demand Conditions: Perform a peak hour demand evaluation for existing conditions (existing conditions in the current water system hydraulic model) and for potable water system buildout conditions including Project demands, to determine the hydraulic impact of the Project on the City's existing Main Zone water system. If a significant impact to water service performance in the nearby area is determined by the City, Consultant will identify potable water system improvements to the existing system within the nearby areas to improve water system performance. Utilize the City's hydraulic design criteria for normal operation conditions that are documented in the City's 2011 Water Master Plan. Consultant will prepare a map showing pre- and post -project water pressures at each hydrant in the project area. Task 1. City Data Requirements: • Potable water demands for the Project area for existing and buildout conditions. • Hydrant test data for C -factor adjustment. • Data for estimating the Main City pressure zone demands. • Flow rates and pressure information at the SFPUC turnouts. Task 2. Evaluate Recycled Water System Consultant will perform a recycled water system analysis to determine recycled water infrastructure requirements to serve the Project development. Pressure and flow results will be shown clearly on maps. Final model files will be submitted to the City in EPAnet format. The following work will be performed: • Update the Hydraulic Model: Update the City's existing recycled system hydraulic model to include proposed pipelines identified in the Preliminary Utility Study, and to allocate irrigation and dual -demands provided by the City for the Project area, other Greystar development areas, Kaiser, and Sobrato. Note that both irrigation and dual -plumbing demands on the site, the night-time irrigation loading may control. • Perform Hydraulic Evaluation for Peak Hour Irrigation Demand Conditions: Perform a peak hour demand evaluation for the recycled water system at buildout conditions with the ATTY/AGR/2019/AMENDMENTS/AMEND NO.1-AECOM REV: 06-17-19 PR Page 17 of 22