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Chloramines are also more stable than chlorine, which can help maintain a <br /> disinfectant residual in the more distant portions of the distribution system. <br /> <br /> Redwood City wants to evaluate the impact of the planned conversion of the-. <br /> drinking water disinfectant from chlorine to chloramines on the City's water <br /> distribution system and storage facilities. Redwood City is also interested in the <br /> preparation of a chloramination monitoring program and a nitrification <br /> prevention and control plan. <br /> <br /> RWC seeks expert technical advice in the development of a water quality <br /> monitoring program for the distribution system and storage facilities and of a <br /> nitrification prevention and control plan, which should also include the <br /> identification of the staffing levels with appropriate accreditation and <br /> certification requirements to facilitate the implementation of both plans. The City <br /> is planning to develop a distribution system unidirectional flushing program. <br /> <br />Scope of Work <br /> <br /> Kennedy/Jenks Consultants will develop a report addressing the following: <br /> · Distribution System Assessment for Chloramine Conversion, <br /> <br /> · Storage Facilities Assessment for Chloramine Conversion, <br /> <br /> · Water Quality Monitoring Program, and <br /> <br /> · Chloramine Conversion Water Quality Assurance Plan. <br /> <br /> Task I - Distribution System Assessment for <br /> Chloramine Conversion <br /> <br /> The distribution system assessment for Chloramine Conversion will consist of: <br /> <br /> · Evaluating the system for the potential for nitrification by identifying <br /> dead ends (dead ends with and without blowoffs will be identified <br /> separately and normally closed valves that result in dead ends shall also <br /> be identified), <br /> <br /> · Estimating the associated hydraulic detention times for lengthy dead <br /> ends, and <br /> <br /> · Identifying recommended system improvements and system management <br /> practices for reducing the potential for nitrification. <br /> <br /> Dead ends possess the greatest potential for water quality related problems. <br /> Identification and prioritization of dead ends within the distribution system will <br /> bet :amou;: in helping the City to continue to deliver high quality water. A <br /> database will be created that identifies each deadend by type, length and diameter <br /> of waterline, materials and age of construction, and number and type of <br /> customers. By knowing the typical water usage for various classifications of <br /> customers, the water residence time in each deadend can be estimated. <br /> <br /> <br />