Agmt21 Environmental Science Associates

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Proposed Work Program June 2021 City of Redwood City / Gatekeeper Projects Subsequent EIR 12 environmental science associates West Yost will conduct a maximum day fire flow analysis (based on requirements provided by the Fire Department) to determine available fire flows in the project area under existing hydraulic model demand conditions and for water system buildout conditions with the project demands. If available fire flows are inadequate with project demand included, West Yost will identify necessary improvements. West Yost will also perform a normal day, peak hour demand evaluation for existing conditions and system buildout with the project. Should the City identify a resulting deficiency, West Yost will identify necessary improvements. Task 2. Evaluate Recycled Water Systems: West Yost will update the City’s existing recycled system hydraulic model (to be provided by the City) by allocating irrigation and dual-plumbing demands provided by the City for the project area. West Yost will also perform a peak hour demand evaluation for the recycled water system at buildout conditions including project demands to determine the hydraulic impact of the project on the City’s recycled water system, based upon City-provided hydraulic evaluation criteria. It is assumed that the revised layout plan for the recycled water pipelines in the downtown area that was previously developed with the City will be used for this analysis. It is assumed that no further revisions to this plan will be needed. Task 3. Prepare Engineering Report: West Yost will prepare an Engineering Report summarizing the hydraulic findings and conclusions, assumed to include a summary of the analyses and will one to two exhibits per system, showing locations and diameters of existing and proposed facilities. Included maps will compare the capacity of each respective system for the pre-project condition, the post-project condition and the mitigated post-project condition, in order to ensure that there is no impact to the service performance of the various City utility systems. The draft report will be submitted to the City for review, and a meeting (budgeted in Task 4) will be held to review the City’s comments, at which point a final Engineering Report will be submitted. Budgeting assumes that no significant changes will be required to prepare the final Engineering Report. Task 4. Meeting and Project Management: This task assumes two face-to-face meetings: a project kickoff meeting, at which key assumptions for the technical evaluations will be reviewed; and a project meeting to review City comments on the draft Engineering Report. Sanitary Sewer (Woodard and Curran) The sanitary sewer analysis will use the sewer system hydraulic model developed for the City as part of its Sanitary Sewer Master Plan initiated in 2019. The Sewer Master Plan analyzed the capacity of the City’s sanitary sewer system under two scenarios: existing (based on water consumption and flows measured in the system during the 2018/2019 time frame) and future (based on development projects “in the pipeline” at that time, as well as potential development of vacant or underutilized parcels in accordance with current zoning and land use plans. The specific development projects and types and quantities of land uses were provided by the City’s Community Development Department planning staff and are documented in the draft Master Plan report. The Master Plan identified capacity deficiencies in the sewer system and developed potential sewer capacity improvement projects to convey the predicted peak flows. In all cases, capacity requirements were defined based on the peak flow under a 10-year design storm event. For this Sewer Capacity Impact Analysis, Woodard & Curran will update the existing model scenario to incorporate any development projects that have been constructed since 2019 (based on information to be provided by the City). Woodard & Curran will also create a “baseline future” scenario on which to evaluate the cumulative impact of the Transit District and Gatekeeper Projects, as well as other planned or potential future developments. The projects (and associated land use quantities) to be included in this scenario will be provided REV: 06-23-21 MI ATTY/AGR.2021.150/Environmental Sciences Associates (Gatekeeper Projects) (Page 22 of 58)