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TASK 2 — WASTEWATER MODEL CALIBRATION/ANALYSIS <br />The wastewater hydraulic model shall be calibrated to observed actual conditions utilizing data <br />derived from IRCUS's SCADA system. The model shall be calibrated within 10 percent of actual <br />system wide wastewater flows based on an overall flow to each lift station service area. The <br />calibration will include adjustments to diurnal patterns based on an average and maximum week <br />condition. These periods shall be selected based on an analysis of historical flow meter data to <br />determine the best applicable periods, as agreed to by the Consultant and IRCUS. Additional <br />reference data may include wastewater pump station pressures and run times, where available. <br />Required SCADA data shall include: <br />• Overall wastewater flow data, including flow meter data for the past three years <br />(WWTP/master meter flow). <br />• Hourly wastewater flow data for a week recorded during typical average and maximum <br />weeks (i.e. pump run times). <br />• Pump station run times/periods — Operational logs of all pump stations, which indicates <br />on/off condition for each pump station over a minimum period of 1 week. <br />• Wastewater system pressure data points, where available. <br />Once the model has been calibrated, it can be utilized to analyze existing capacity constraints in <br />order to identify current and potential deficiencies within the wastewater transmission system. <br />Working with IRCUS staff, Consultant will confirm trigger criteria for pump stations and force <br />mains to determine available capacity; perform existing system analyses under peak flow <br />conditions; and identify existing system deficiencies based on IRCUS design criteria. <br />TASK 3 — TECHNICAL MEMORANDUM <br />Technical Memorandum will be presented summarizing the model updates, current wastewater <br />flows, calibration data and recommendations for the existing condition scenarios. <br />TASK 4 — MEETINGS <br />Three (3) meetings have been budgeted for under this SOW. <br />ASSUMPTIONS <br />Certain assumptions have been made in preparing this SOW. To the extent possible, they are <br />stated herein, and are reflected in the budget for services. If the work required is different than <br />that stated herein, the resultant changes in scope of work will serve as a basis for additional <br />assignment as agreed to by both IRCUS and Consultant. <br />The assumptions are as follows: <br />• Equipment/pipeline updates will be provided by IRCUS in a geodatabase that can be <br />imported into WaterCAD. <br />148 <br />