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ATTACHMENT 1 <br /> 5 <br /> SCOPE OF WORK <br /> Assumptions: <br /> 1. The existing conveyance system is in good condition and there is nothing that <br /> would reduce the capacity of the pipelines to less than the clean pipe capacity. <br /> City Responsibilities: <br /> 1. Provide documentation of the existing collection system including: <br /> a. IDS system drawings of the conveyance system in the vicinity of Hayes <br /> Street. <br /> b. "As-built"drawings of the Hayes Street Regulator. <br /> c. "As-built"drawings of the Siphon Inlet Structure, Siphons, and the <br /> conveyance piping between the Hayes Street Regulator and the Siphon <br /> Inlet Structure. <br /> d. System Elevation Survey conducted by Clark M. Leeman Land Surveying. <br /> 2. Visit the site with the Contractor(HDR)to review the current system <br /> configuration. <br /> Work Products: <br /> 1. Description of the system will be incorporated into the technical memorandum of <br /> Task 605. <br /> Task 603—Siphon Conveyance Model <br /> Contractor Responsibilities: <br /> 1. Develop a continuous simulation model to relate rainfall and flow at the siphon <br /> inlet structure. <br /> 2. Establish a correlation of flow rate through the inverted siphons directly with <br /> water surface levels within the siphon inlet structure. Calibrate the model with <br /> flow,water level, and rainfall data. <br /> 3_ Use 30 years of rainfall data in the calibrated model to predict anticipated flow <br /> rates based on existing City development. <br /> 4. Based on the predicted flows establish the one year return flow rate and water <br /> level within the siphon inlet structure <br /> 5. Determine the head and capacity available for additional flow without increasing <br /> the frequency of overflows at this site to greater than one event per year <br /> 6. Perform a hydraulic analysis of the conveyance piping between the Hayes St <br /> overflow structure and the siphon inlet structure to determine the impact of raising <br /> the weir height in the Hayes Street Overflow Structure. <br /> City Responsibilities: <br /> 1. Provide real time siphon flow data, siphon inlet structure water surface level data, <br /> and rain fall data. Flow and rainfall data shall be in a maximum of 15-minute <br /> increments. <br /> 2. Provide historical overflow data for the Hayes Street and Siphon Inlet Structure <br /> Overflow Weirs. Data shall be provided in 5 minute increments. <br /> 3. City shall validate as necessary the results of the Contractor's (HDR)modeling <br /> effort using the City's sewer conveyance system model. <br /> Page 2 of 4 <br /> 2 <br />