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I <br /> CITY OF EVERETT SPECIAL PROVISIONS <br /> 111 <br /> Guidelines for Required Flow and Openings to Flush Pipelines <br /> (assumes 40 psi residual pressure in water main) I Pipe Dia. Flow Required Size of Tap (in) Number of <br /> (in.) to Produce 3 2 1/2" Hydrant <br /> fps (approx) outlets ' <br /> Velocity in Main 1 1 1/2 2 <br /> (gpm) (in) (in) (in) <br /> 4 120 1 1 <br /> 6 260 1 1 <br /> 8 470 2 1 <br /> 10 730 3 2 1 I 12 1,060 3 2 <br /> 16 1,880 5 2 <br /> Guidelines for Water Main Volume I <br /> Inside Dia. Volume per 100 LF <br /> On) (gal) <br /> 4 65 <br /> 6 147 <br /> 8 261 <br /> 10 408 <br /> 12 587 <br /> 20 1.632 <br /> Provide taps and other appurtenances required for temporary release of air, <br /> chlorination, or flushing purposes as a part of the Work. <br /> To protect aquatic life in receiving waters, neutralize the chlorine contained in the <br /> discharge water before disposing into a natural drainage channel or feature <br /> draining to a natural channel. Dispose of disinfecting solutions to the satisfaction <br /> of the City of Everett and the Washington Department of Ecology. Discharge water <br /> disposal may be directed to an available sanitary sewer, if approved by the <br /> Engineer and provided the rate of disposal will not overload the sewer. <br /> 7-09.3(24)B Disinfectant Concentration and Retention Period (Contact <br /> Interval) <br /> Provide disinfection concentration necessary to obtain a free chlorine residual of I not less than 10 mg/1 remaining in the disinfectant solution after a 24 hour contact <br /> time. Provide the initial free chlorine residual concentration of disinfectant solution <br /> not less than 25 mg/I. Contractor may reduce disinfectant chlorine solution contact <br /> time from 24 to 12 hours by using an initial disinfectant concentration of 50 mg/I. III <br /> Maximum allowable disinfectant concentration shall be 50 mg/I. The ending <br /> concentration of an initial 50 mg/I solution following a 12 hour contact time shall be <br /> not less than 10 mg/I. <br /> I <br /> 7-09.3(24)C Form of Applied Chlorine <br /> Perform disinfection of water mains using the continuous feed method employing <br /> either liquid calcium hypochlorite or liquid sodium hypochlorite solutions. Dry <br /> calcium hypochlorite and gaseous or liquid chlorine is not allowed. <br /> Follow the continuous feed methods specified in the most recent version of AWWA <br /> Standard C-651 and Section 5-15 of the latest edition of the City of Everett <br /> Water Main Replacement"Q" Division 7—WATER MAIN July 8, 2016 <br /> - Broadway <br /> WO No.—UP3612 SP-154 <br />