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Because of these differences, WY A recommends using data to develop up to three diurnal curves for the system: one diurnal curve for the Main City Zone; one diurnal curve for the Redwood Shores area; and use of City's SCADA data from one representative pumped zone to represent smaller, residential pressure zones within the system. WY A will review SCADA coverage and water usage trends with the City to identify the best zone to represent smaller, residential pressure zones. For the selected zone, the City shall provide one to two weeks of hourly data from the peak usage month. WY A will develop an hourly diurnal curve from hourly mass-balance calculations (zone inflow, outflow and change in storage). Using the flow monitoring data, and supporting SCADA data collected during the special monitoring program, WY A will also develop an hourly diurnal curve for the City Main pressure zone and for the Redwood Shores area. TASK 6.6 SET UP HYDRAULIC MODEL FOR OPTIMAL ENERGY AND WATER QUALITY ANALYSIS The City wants a hydraulic model that is set up for extended period simulation, and includes water quality information to perform water quality evaluations, and pump efficiency information to compute pump energy usage and operating costs. WY A will work with the City to develop a bulk chlorine decay curve using water quality samples collected at SFPUC regional system turnouts. WY A will provide a testing protocol for the City, and coordinate with the City to have the City or the City's contract laboratory develop the chlorine decay curve. The chlorine decay parameters will be entered into the hydraulic model. WY A will review available pump performance and efficiency information to identify where data are not available and pump testing is needed to calibrate the model. Budgeting assumes that City staff has or will be responsible for conducting pump testing. WY A will adjust pump curves using pump affinity laws to fit test points to a curve that can be entered into the model. WY A will use pump efficiency information from pump testing, and enter pump efficiency data into the model. Task 6 Work Products: . Hydrant testing plan summarizing testing locations, protocols during testing, recommended model calibration accuracy and supplemental operational information required for testing. . Draft chapter summarizing the information and methodology to develop the model, with a summary of the results from the model calibration/verification and energy and water quality analyses. Task 6 Assumptions . WY A will provide records that cannot be matched through the geocoding process for City review / correcti on. . City staff will be responsible for conducting hydrant flow testing, including turning valves, providing de-chlorination, and conducting traffic control, as necessary. WY A will provide Octo ber 22, 2009 9