Laserfiche WebLink
revised based on City's comments. Consulting Engineer will provide one <br /> individual to be on site to assist City in completing the tests and to gather field <br /> information. City shall provide operational assistance for these tests, including <br /> hydrant and valve turning, traffic control, pump and tank operation, and other <br /> related assistance. City will provide SCADA records at the time of each test. <br /> II. Update historical and projected demands. Consulting Engineer will use City provided <br /> information to project sales per customer classification, sales to pumpage ratio, total <br /> pumpage, average day and maximum day pumpage, and population. Consulting <br /> Engineer will use City provided information to generate system wide and pressure zone <br /> specific diurnal demand patterns. <br /> III. Update the distribution system service area based on City provided information for the <br /> future plan year. Consulting Engineer will evaluate the demands associated with serving <br /> new areas within the service boundary and evaluate anticipated system needs to provide <br /> an adequate level of service. <br /> IV. Develop a system inventory based on City provided information. The inventory will <br /> include the capacity of each storage and pumping facility with a description of each <br /> facility's function within the distribution system. <br /> V. Evaluate the additional required capacity. Demand projections will be compared with <br /> system inventory and the service area to determine the amount of reserve or deficient <br /> storage and supply for the average day, maximum day, maximum hour of the maximum <br /> day, and maximum day plus fire demands for each of the two plan years. City will <br /> identify the desired level of fire service for both flow and duration. <br /> VI. Conduct computer model evaluations for a total of two plan years. <br /> 1. Conduct static evaluations of the distribution system under the current physical <br /> configuration. Evaluate the system performance for the average day, maximum <br /> day, and maximum hour of the maximum day demands. Conduct a steady state <br /> fire flow analysis. <br /> 2. Analyze the system head curve at the High Service Pumping Station, the William <br /> Street Pumping Station, and the Southwest Pressure Zone booster station. Each <br /> analysis will be limited to model predicted results and will not include field <br /> measurements, testing, or effort required to confirm model predictions. General <br /> observations regarding the pump performance compared to the system curve will <br /> be reported. <br /> 3. Conduct the following extended period simulations. <br /> a. Maximum Day-Analyze system performance by running a 72 hour <br /> extended period simulation of the maximum day. Evaluate the resulting <br /> pressure contours, hydraulic grade contours, and storage levels. <br /> b. Minimum Day - Analyze system performance by running a 72 hour <br /> extended period simulation of the minimum day. Evaluate the resulting <br /> pressure contours, hydraulic grade contours, and storage levels. <br /> C. WTP Power Loss - Analyze system performance by running an extended <br /> period simulation while the main pressure zone is floating on elevated <br /> storage and supplemented by the William Street ground storage facility. <br /> Evaluate the resulting pressure contours, hydraulic grade contours, and <br /> the duration that demands can by supplied before system pressures drop <br /> below 20 psi. This evaluation will use the maximum day demand curve <br /> and will only consider domestic, not fire flow, demands. <br /> A-2 <br />