Reece Construction Company Inc 4/24/2018

CITY OF EVERETT SPECIAL PROVISIONS Provide mechanical restrainingdevices inplace of concrete blockingon all joint fittings connecting ductile iron pipe to ductile iron pipe. Where shown on the Plans or as allowed by the Engineer, provide concrete thrust blocking at bends, tees, plugs and crosses, including City installed fittings. Provide cast-in-place concrete thrust blocking having a minimum of 1/4-square foot bearing against the fitting and two square feet bearing against undisturbed soil and be clear of joints so as to permit taking up or dismantling joint. Provide a minimum measurement of 12-inches between the pipe and the undisturbed bank for all poured in place concrete thrust blocking. Form concrete blocking and pour using commercial concrete. Place blocking between solid ground and the fitting to be anchored with the area bearing on the pipe and on the ground in each instance being as Shown or directed by the Engineer. Place the blocking, unless otherwise shown or directed, so that the pipe and fitting joints, including nuts and bolts, can be accessible for repair. ' 7-09.3(23) Hydrostatic Pressure Test Supplement 7-09.3(23) by adding the following: Provide City approved double-check assembly for the purpose of testing and ' flushing. City will not charge for the water used in this operation. Successfully complete hydrostatic pressure test prior to starting disinfecting new water mains. ' 7-09.3(23)A Testing Extensions from Existing Mains Delete 7-09.3(23)A. 7-09.3(24) Disinfection of Water Mains Delete 7-09.3(24), including subsections, and substitute the following: 7-09.3(24) Flushing and Disinfection of Water Mains (******) Flush, disinfect with a chlorine solution and obtain passing coliform bacteria test reports before placing new water mains or extensions to existing mains in service. Submit flushing and disinfection procedures in accordance with this section. Provide submittal containing, at a minimum: • location of taps and other appurtenances used for chlorination and flushing purposes, • location of the sample collection taps, • disposal location and treatment procedure for chlorinated water discharged from the mains, and • procedure for disinfection including application method, point of application, and target concentrations for the contact interval being used. 7-09.3(24)A Flushing ' Flush sections of pipe being disinfected to remove solids that may have become lodged in the pipe. Provide a tap sufficient to provide a flush velocity inside the main of at least 2.5 fps if no hydrant is installed at the end of the main. Flush as long as material or color is visible in the discharge. Flush at a minimum one full pipe volume of water from the section of new main being tested. Guidelines for Required Flow and Openings to Flush Pipelines (assumes 40 psi residual pressure in water main) ' Pipe Dia. Flow Required Size of Tap (in) Number of (in.) to Produce 2.5 2 1/2" Hydrant fps (approx) outlets Velocity in Main 1 1 1/2 2 (gpm) (in) (in) (in) Water Main Replacement S Division 7-STORM,SEWER,WATER January 29, 2018 WO No.-UP3664 SP-149