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REV: 11-07-23 SK <br />surge conditions may occur if a valve on the force main is closed very quickly <br />while the pumps are running. During these conditions, the force main will <br />experience higher pressures than normal operations. The surge analysis will <br />assume the pumps are fixed speed for the worst-case condition, and the pump <br />station wet well is full, i.e., the least amount of static head is required and the <br />force main is flowing at the highest velocity possible. Consultant will evaluate <br />surge pressures in the discharge pipe immediately downstream of the pump, <br />where the pressures in the force main are the highest. Consultant will prepare <br />a technical memorandum documenting the analysis. The City will issue <br />comments on the draft memorandum. Consultant will address City comments <br />and prepare a final memorandum. Comments on the final memorandum are <br />not anticipated; addressing comments on the final memorandum is not <br />included. <br />Subtask 4.5 – Noise Analysis <br />Consultant will conduct a noise analysis of the pump station and associate <br />equipment to confirm if the proposed improvements satisfy City requirements <br />for decibel levels at the pump station facility’s fence line. Consultant will prepare <br />a technical memorandum documenting the analysis. The City will issue <br />comments on the draft memorandum. Comments on the final memorandum <br />are not anticipated; addressing comments on the final memorandum is not <br />included. <br />Subtask 4.6 – Alternatives Analysis and Basis of Design Report <br />Consultant will prepare an Alternative Analysis and Basis of Design Report <br />(BOD) to document the alternatives and the engineering analyses performed <br />during this task. Consultant will include descriptions of the proposed equipment <br />and systems. The report will include preliminary sizing calculations, system <br />curves, and a map of the station location. The pump station rendering, if <br />prepared, surge analysis, memorandum, noise analysis memorandum, <br />alternative layout, and the Vehicle Access Exhibits are anticipated to be <br />included as appendices. Consultant will include documentation that the BOD <br />has been reviewed by the Design Lead Engineer. Consultant will submit a draft <br />report to the City for comment. Consultant will address City comments and <br />prepare a final BOD. Comments on the final BOD are not anticipated, and <br />addressing comments on the final BOD is not included. <br />The preliminary discharge vault sizing will account for anticipated Sea Level <br />Rise (SLR) and design water level information in Redwood Creek that are <br />provided by others. The City will provide Consultant with what SLR assumption <br />is desired and what water level Consultant should assume in Redwood Creek <br />during the 100-year design storm. <br />Subtask 4.7 – Submittals and Plan Reviews <br />ATTY/AGR.2023.241/BKF Engineers (Price Tract Pump Station Design) (Page 20 of 54)