SRV Construction Company 5/1/2018

CITY OF EVERETT SPECIAL PROVISIONS not less than 25 mg/I. Contractor may reduce disinfectant chlorine solution contact time from 24 to 12 hours by using an initial disinfectant concentration of 50 mg/I. Maximum allowable disinfectant concentration shall be 50 mg/I. The ending 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 water mains 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 ofAWWA 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 Water Mains and Water Service Connections Chlorinate connections to existing water mains 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 Water Main Replacement"Q" Division 7-STORM, SEWER,WATER February 9, 2018 -Evergreen Way Rebid WO No.-UP3612 SP-155