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ICITY OF EVERETT SPECIAL PROVISIONS <br /> 1 be anchored with the area bearing on the pipe and on the ground in each instance <br /> being as Shown or directed by the Engineer. Place the blocking, unless otherwise <br /> I shown or directed, so that the pipe and fitting joints, including nuts and bolts, can <br /> be accessible for repair. <br /> 7-09.3(23) Hydrostatic Pressure Test <br /> I Supplement 7-09.3(23) by adding the following: <br /> Provide City approved double-check assembly for the purpose of testing and <br /> flushing. City will not charge for the water used in this operation. <br /> I Successfully complete hydrostatic pressure test prior to starting disinfecting new <br /> water mains. <br /> 7-09.3(23)A Testing Extensions from Existing Mains <br /> IDelete 7-09.3(23)A. <br /> 7-09.3(24) Disinfection of Water Mains <br /> I Delete 7-09.3(24), including subsections, and substitute the following: <br /> 7-09.3(24) Flushing and Disinfection of Water Mains <br /> (******) <br /> I Flush, disinfect with a chlorine solution and obtain passing coliform bacteria test <br /> reports before placing new water mains or extensions to existing mains in service. <br /> Submit flushing and disinfection procedures in accordance with this section. Provide <br /> I submittal containing, at a minimum: <br /> • location of taps and other appurtenances used for chlorination and flushing <br /> purposes, <br /> I • location of the sample collection taps, <br /> • disposal location and treatment procedure for chlorinated water discharged <br /> from the mains, and <br /> I • procedure for disinfection including application method, point of application, <br /> and target concentrations for the contact interval being used. <br /> 7-09.3(24)A Flushing <br /> I Flush sections of pipe being disinfected to remove solids that may have become <br /> lodged in the pipe. Provide a tap sufficient to provide a flush velocity inside the <br /> main of at least 2.5 fps if no hydrant is installed at the end of the main. Flush as <br /> I long as material or color is visible in the discharge. Flush at a minimum one full <br /> pipe volume of water from the section of new main being tested. <br /> Guidelines for Required Flow and Openings to Flush Pipelines <br /> I (assumes 40 psi residual pressure in water main) <br /> Pipe Dia. Flow Required Size of Tap (in) Number of <br /> (in.) to Produce 2.5 21/2" Hydrant <br /> I fps (approx) outlets <br /> Velocity in Main 1 1 1/2 2 <br /> (gpm) (in) (in) (in) <br /> I4 100 1 1 <br /> 6 200 1 1 <br /> 8 400 2 1 1 <br /> I 10 600 3 2 1 <br /> 12 900 2 2 <br /> 16 1,600 4 2 <br /> Sewer Regulators R4 and Division 7—STORM,SEWER,WATER May 2017 <br /> I R39 Modifications <br /> WO No.—UP3633 SP-165 <br />