SRV Construction Company 5/1/2018

CITY OF EVERETT SPECIAL PROVISIONS 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 main. EMC staff will collect and measure samples at the start and at the end of the disinfectant contact period. Provide sample taps as noted in 7-09.3(24)1 to allow EMC staff to collect at least I one set of disinfectant concentration, coliform bacteria and free chlorine samples from both ends of new mains, at the end(s) of each cross or branch, and every 1200 feet along the main. Notify EMC staff at least five business days prior to requiring having EMC staff collect final coliform bacteria and free chlorine residual samples. The City of Everett EMC staff will collect bacteriological and disinfectant residual samples for submitting to Washington State Department of Health, Drinking Water Division certified laboratory for testing. EMC staff will immediately notify Contractor and Engineer upon receiving analysis results. Upon receiving passing test results, flush disinfectant solution from the newly-laid mains until the replacement water throughout the length of the main tests having a level of free chlorine residual representative of the distribution system water 111supply. 7-09.3(24)1 Sample Collection Taps Provide water sample collection taps at each required sampling location in accordance with COE Standard Drawing No. 526 and as described in these Special Provisions. Locate the end of each water sample collection tap above existing ground level. Plumb taps to provide downward water flow to allow effective filling of sample containers. City EMC staff shall have the authority to refuse to conduct sampling from taps they consider inadequate or not representative of water main quality. On mains exceeding 1,200 feet, provide for sample collection at one of the water 111 services shown on the Plans. If no water services are shown on the Plans, provide 3/4-inch sampling tap at appropriate locations along the main. For mid-line service taps not providing future customer service, plumb into dead- end meter setters and meter boxes at the street or sidewalk edge for use as future dedicated sampling locations in accordance with COE Standard Drawing No. 526. Locate sample tap upstream of the flushing hose connection for bacterial and disinfectant residual sampling. Due to sanitary and representative sampling issues, use only installed sample taps for collection of free chlorine or bacteriological samples. I 7-09.3(24)J Repetition of Flushing and Testing Should the initial disinfection procedure result in an unsatisfactory bacteriological test, meaning total coliform bacteria is present, repeat the entire flushing and disinfection procedure until obtaining satisfactory test results. Unsatisfactory test results indicates Contractor's failure to keep the pipe, sample taps, and temporary filling attachments clean during construction, or to properly flush and disinfect the main. Supplement 7-09.3 by adding the following: Water Main Replacement"Q" Division 7—STORM,SEWER,WATER February 9, 2018 -Evergreen Way Rebid WO No.—UP3612 SP—156 ,