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<br />Kennedy/Jenks Consultants <br /> <br />Phong Du, PE <br />City of Redwood City <br />31 August 2009 <br />Page 3 <br /> <br />. Run one (1) scenario without the Delta 10 pressure control strategy. The <br />specific scenario that will be run will depend on the results of the timeline- <br />based analysis tool. <br />. Run three (3) additional scenarios, using scenarios defined by the City. The <br />criteria for each additional scenario will be documented with City input to <br />provide a documented basis for each model run and a basis for subsequent <br />interpretation. <br />. Evaluate the need for Booster Pump Station and remote storage, including <br />preliminary location and configuration (single pressure zone or dual pressure <br />zone). Up to two (2) locations and two (2) piping configurations will be <br />studied. No additional model runs will be conducted to perform this <br />evaluation; the evaluation will be based on the model runs defined here as <br />part of Task 2.a. <br /> <br />Meetings: This Subtask includes attendance by 2 engineers at 2 meetings to <br />discuss the modeling results and r~view the graphical, timeline-based analysis <br />tool. This Subtask also includes attendance of 2 engineers at 1 workshop to <br />discuss the booster pump and/or remote storage evaluation. <br /> <br />Deliverables: Hydraulic Modeling Results Technical Memorandum; <br />Timeline-Based System Analysis Chart <br /> <br />b. Pre-Design Considerations <br /> <br />This Subtask will be used to assist the City in addressing design considerations <br />that are anticipated to affect DPS Capacity Improvements Design (Task 3) and <br />pump station operation in the future. The design considerations that will be <br />addressed are: <br /> <br />. Delta 10 - confirm current design criteria <br />. Pump discharge pressure - confirm current design criteria <br />. Level of Service - assist City with definition <br />. Design Peaking Factor - assist City with definition <br />. Need for second accumulator - confirm current design criteria <br />. Pump combination for next Increment - assist City with definition <br /> <br />Subtask 2.b will include limited effort to review the following issues that will be <br />used in the development of design criteria to be used in Task 3: <br /> <br />. Sensitivity analysis of pump discharge at lower DPS discharge pressure <br />. Review of current control strategy to identify the following: <br />o Operational advantages of modifying the pump redundancy configuration <br />o Operational advantages of modifying pump operating point, -regardless of <br />efficiency, for peak periods, to achieve greater capacity. <br /> <br />http://sfosp/redwoodcity/rw .startup.2007/project managementldps capacity improvements projectldps.capacity.increaseJelter.proposal.doc <br />