Road Construction Northwest Inc 12/31/2019

CITY OF EVERETT SPECIAL PROVISIONS ' concentration of an initial 50 mg/I solution following a 12 hour contact time shall be not less than 10 mg/I. 7-09.3(24)C Form of Applied Chlorine Perform disinfection of watermains using the continuous feed method employing either liquid calcium hypochlorite or liquid sodium hypochlorite solutions. Dry calcium hypochlorite and gaseous or liquid chlorine is not allowed. Follow the continuous feed methods specified in the most recent version of AWWA Standard C-651 and Section 5-15 of the latest edition of the City of Everett "Design and Construction Standards and Specifications for Development", except for the City's prohibition on the use of dry calcium hypochlorite or gaseous chlorine. 7-09.3(24)D Point of Application Whenever possible, use the beginning of the pipeline extension, or a valved section of it, as the point of application for the disinfectant solution. Provide a tap to supply water for delivering the disinfectant solution on the pressure, or upstream, side of ' the valve controlling the flow into the pipeline extension, but downstream of the backflow preventer used to isolate the new main from the existing water distribution system. Obtain Engineer approval in writing to use alternate points of applications. For a City allowed direct tie-in to an existing main via an in-line backflow preventer and with the approval of the Inspector, the point of application may be through a corporation stop inserted in the horizontal axis of the pipe. Locate tap within 10- feet of where the line is tied into the existing system. Swab the internal surfaces of the backflow preventer and adjacent downstream appurtenances, valves or couplings for example, with straight hypochlorite solution prior to their installation. 7-09.3(24)E Preventing Reverse Flow Provide a State Department of Health approved backflow preventer installed in the connecting line before making a connection between the existing distribution system and water lines constructed under this Contract that have not been flushed, disinfected, and tested. Install backflow preventer upstream of temporary fill hoses and disinfectant injection equipment. ' 7-09.3(24)F Chlorinating Valves, Hydrants, and Appurtenances Operate valves, hydrants, and other appurtenances during the disinfectant contact interval for newly-laid pipe while filling the pipeline with the disinfectant chlorine ' solution and the main is under normal operating pressure. Normal operating pressure is the pressure the existing distribution system provides through the temporary backflow protection device. ' 7-09.3(24)G Chlorinating Connections to Existing Watermains and Water Service Connections Chlorinate connections to existing watermains in accordance with the following sections of the most recent revision of AWWA Standard C651: Section 4.6 - Final Connections to Existing Mains, Section 4.7 - Disinfectant Procedures When Cutting Into or Repairing Existing ' Mains, and Section 4.8 - Special Procedures for Caulked Tapping Tees Swab the internal surfaces of closure fittings with a 5 to 6 percent chlorine solution ' that can be found in liquid household sodium hypochlorite bleach. 7-09.3(24)H Final Flushing and Testing Notify the City Utilities Division, Environmental Monitoring and Compliance (EMC) ' staff at least five business days prior to requiring EMC staff to collect samples and measure the chlorine concentration of the disinfectant solution placed in the new Watermain Replacement"U" Division 7-STORM, SEWER,WATER October 1, 2019 WO No.-UP3698 SP-180