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O?-ZG-OZ 08:3Zam From-Redwood City PW$ + T-?97 P.003/009 F-BG2 <br /> <br /> Chlor.mlnes are also mo~e stable thim chlorine, which esn help mairaain a <br /> disinfectant residual in the more distant poxtions of thc distribution system. <br /> Redwood City wants to evaluate the impact of[he planned conve~io;1 of the <br /> drink;ne water d{sinfectant ~rom chlorine to chioramines on the,City's water <br /> distribution system and storage facilities. Redwood City is also interested in thc <br /> preparation of a ct~lor~mlna~ion monitoring prograxn and a nitrification <br /> prevention and control plan. <br /> KWC seeks ~xpet~ technical advice in the developmen~ ora water quality <br /> monitoring pro.am for the ~-bution system and storsge facilities and of a <br /> nitriiicatiofl pre¥cnfion and control plan, which should also include thc <br /> identification of the st.~%$ levels with appropriate accrediiation and <br /> c. er~ficafion requiremen~ to facilitate the implementation of both plane: The City <br /> is planning to develop a distn'bution systern tmidirectional flushing progr~,~ <br /> <br /> Scope of Work <br /> <br /> Kenncdy/Jenks Consultants will develop a report addressing the following: <br /> · Distribution System Assessment for Chlor~,'~i~e Conversion, <br /> <br /> · Storage Facilities Assessmen~ for Chlor~mine Conversion, <br /> <br /> · WaTer (~,,~lity Mollltoring Yrogram, and <br /> <br /> · Chloramine Conversion Wa~r quality Assu~nce Plato <br /> <br /> Task 1 - Distribution System Assessment for <br /> Chloramina Conversion <br /> · The distribution sys;=m asscssn~ut i'or Chlor~m;~¢ Conversion will cousi~t oil. <br /> <br /> · EvalUating the sys;~m for the potend~ for nitrification by idenlifyi~g <br /> dead ~ (dc~l ends with and without blowoi~ will hc identified <br /> separately a~d normally closed ~alvcs ~hat result in dead ~ds shall also <br /> be identi£ed), <br /> <br /> · t~sttmating thc sssociated hydraa]ic de~ation ~imes for lc~thy al=ad <br /> cods, and <br /> <br /> Identifying r~ommended gystem improvements a~d system mansgcm~ <br /> practic~ for reducing the potcutial for niuii~cation. <br /> <br /> Dead ends possess th= greatest pcrtcutial i'or water quality related problems. <br /> ldentificat/on anti priorifization of dead cuds within the dismqmtion systern will <br /> be paramount in helping the City tn continue to deliv~ high quality water. A <br /> database will be created that identifies ~ach deadend by type, length and diameter <br /> of waterline, materi~ls and age of conslxuction, and number and type of <br /> customers. By knowing the typical water usage for various classifications of <br /> customers, [he wa~er residence time in e.~.h deadend can be es~rnated. <br /> <br /> <br />