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c. Source of supply information (e.g., wells or regional water) d. Other locations where flow and/or pressure is measured in the system 3. In addition, operational data will need to be provided for the calibration period, which includes the following, if different from what is currently entered into the model: a. PRV settings b. Pump controls c. Control valve settings and status d. Any changes in operation (outside of normal operations) that occurred during the calibration field testing time period 4. HDR will provide technical support and field observation as City staff perform the flow tests. Up to five days of in-field support is assumed. 5. Use existing diurnal curve to approximate system demands in model at the time of various hydrant tests. 6. Perform steady state, planning level calibration. Adjust model so that 85% of the simulated pressures are within 5% of the measured value (as possible) of field test results and 100% of the simulated pressures are within 15% of the measured value of the field test results. Any areas of the system that cannot meet this criterion will be documented in the calibration results. Modeling Scenarios 1. The following base simulations will be run in the same order as listed below. All will be steady-state model runs. Description Demand Purpose Existing Fire Flow, Current Existing system Evaluate deficiencies and develop high Steady State Maximum Day priority projects for 10 yr CIP for plus fire flow addressing existing fire flow conditions Existing Peak Current Peak Existing system Evaluate deficiencies and develop high Hour,Steady State Hour priority projects for 10 yr CIP for addressing existing peak hour conditions 10-Year Fire Flow, 10-Year Existing system Evaluate 10-year fire flow deficiencies Steady State Maximum Day given existing system plus fire flow 10-Year Peak 10-Year Peak Existing system Evaluate 10-year peak hour deficiencies Hour,Steady State Hour given existing system 20-Year Fire Flow, 20-Year Existing system Evaluate 20-year deficiencies given Steady State Maximum Day existing system plus fire flow 20-Year Peak 20-Year Peak Existing system Evaluate 20-year deficiencies given Hour, Steady State Hour existing system 10-Year Fire Flow, 10-Year Existing system+ Evaluate 10-year fire flow deficiencies after Steady State Maximum Day improvements to incorporating improvement projects to plus fire flow solve existing solve existing deficiencies to identify lower deficiencies priority projects for 10 yr CIP 10-Year Peak 10-Year Peak Existing system+ Evaluate 10-year peak hour deficiencies Hour,Steady State Hour improvements to after incorporating improvement projects to solve existing solve existing deficiencies to identify lower deficiencies priority projects for 10 yr CIP Everett Comprehensive Water Plan June 12, 2019 Exhibit A—Scope of Services Page 20 of 30