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Attachment SC <br /> D4. Progress Meeting#3: Attend and facilitate a meeting with City to review risk-based assessment and <br /> recommendations. <br /> D5. Risk-Based Condition Assessment Technical Memorandum: Prepare the Technical Memorandum <br /> summarizing the results of the risk-based assessment of the wastewater linear assets and key lift <br /> stations, and recommendations for future development of the City's asset management program. <br /> An electronic PDF file of the Technical Memorandum will be submitted to the City. Comments or <br /> edits to the memorandum will be incorporated into the Master Plan report. <br /> Task E: Wastewater System Analysis <br /> E1. Perform Existing Wastewater System Analysis: Perform extended period dynamic simulations of the <br /> collection system considering gravity sewers, lift stations and force mains as a single, interrelated <br /> system. Perform modeling and simulations for projected dry weatherflows(minimum,average,and <br /> maximum day)and peak wet weather flows during the existing planning period. Model network will <br /> incorporate all pipes 8-inches in diameter and larger, with additional smaller diameter mains <br /> necessary for connectivity, key lift station evaluation,or those specifically designated by the City for <br /> inclusion. <br /> • Identify the segments of sewer mains where surcharge, overloading, and overflow are <br /> predicted to occur under existing conditions. <br /> • Evaluate lift station capacities and available information. Catalog existing lift station <br /> information including wet well characteristics and operating parameters,pump data(size, <br /> type, rated capacity and head), firm pumping capacity, force main information, and <br /> system curve characteristics. Recommend field investigations to collect missing or <br /> desired supplemental data. Assess existing firm capacity and identify any deficits with <br /> present-day flow conditions. Identify lift stations that can be eliminated based on depth, <br /> topography, proximity, and capacity of the upstream and downstream portions of the <br /> collection system. <br /> • Evaluate current collection system I&I response and compare to previous model wet <br /> weather parameters to identify where notable changes have occurred and determine the <br /> degree to which the system has changed. Cross-reference maintenance activities and <br /> renewal efforts with I&I response changes and calculate volume of I&I reduction. <br /> • Identify locations within the collection system which may benefit from long-term <br /> monitoring by Smart Cover or other flow monitoring device. Sites will be selected with <br /> regard to existing or recently monitored Smart Cover locations. <br /> E2. Perform Future Wastewater System Analysis: Perform extended period dynamic simulations of the <br /> collection system considering gravity sewers, lift stations and force mains as a single, interrelated <br /> system. Perform modeling and simulations for projected dry weather flows(minimum,average,and <br /> maximum day) and peak wet weather flows at Year 2023 and at 5-year, 10-year, and 25-year <br /> planning horizons. <br /> • Identify the segments of interceptors and trunk lines where surcharge and overflow are <br /> predicted to occur,and at what planning period each constraint is predicted to occur. <br /> Page 4 of 8 <br />