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ATTACHMENT 1 <br /> 5 SCOPE OF WORK <br /> Assumptions: <br /> 1. Attend one meeting with the City to review the results of the modeling analysis. <br /> Work Products: <br /> 1. Flow versus rainfall model for the inverted siphons. <br /> 2. Long term flow projection (30 year)for the siphon based on records of historical <br /> City rainfall. <br /> 3. Hydraulic analysis of the Hayes Street Regulator to the Siphon Inlet Structure. <br /> 4. Determination of the available head in Siphon Inlet Structure for increasing flows <br /> to the wastewater treatment plant. <br /> 5. Determination of the increase in the weir height required to reduce the overflows <br /> at the Hayes Street Regulator to less than one event per year. <br /> Task 604—Conceptual Design <br /> Contractor Responsibilities: <br /> 1. Develop a design concept for increasing the weir height of the Hayes Street <br /> Regulator to reduce overflows to less than one event per year. <br /> 2. Develop a design concept for converting the one manhole structure between <br /> Hayes Street and the Siphon Inlet Structure to a pressure structure assuming that <br /> the hydraulic grade line in this piping will be increased by raising the Hayes <br /> Street Overflow weir height. <br /> City Responsibilities: <br /> 1. Attend a meeting to develop design concepts. The City project manager shall <br /> invite relevant City personnel. <br /> Assumptions: <br /> 1. The weir at the Hayes Street Regulator can be raised without increasing the <br /> frequency of overflows at the Siphon Inlet Structure. <br /> 2. One meeting with the City to develop design concepts for improvements to the <br /> system. <br /> Work Products: <br /> 1. Design concepts of new structures for the Hayes Street system. <br /> Task 605—Reports <br /> Contractor Responsibilities: <br /> 1. Prepare a technical memorandum documenting the results of the modeling effort, <br /> the conclusions reached and a description of design concepts. <br /> City Responsibilities: <br /> 1. Review the draft technical memorandum and provide comments back to the <br /> Contractor. <br /> Page 3 of 4 <br />