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CITY OF EVERETT SPECIAL PROVISIONS 1 <br /> main. EMC staff will collect and measure samples at the start and at the end of the <br /> disinfectant contact period. <br /> Provide sample taps as noted in 7-09.3(24)1 to allow EMC staff to collect at least <br /> one set of disinfectant concentration, coliform bacteria and free chlorine samples <br /> from both ends of new mains, at the end(s) of each cross or branch, and every 1200 <br /> feet along the main. <br /> Notify EMC staff at least five business days prior to requiring having EMC staff I <br /> collect final coliform bacteria and free chlorine residual samples. <br /> The City of Everett EMC staff will collect bacteriological and disinfectant residual <br /> samples for submitting to Washington State Department of Health, Drinking Water <br /> Division certified laboratory for testing. EMC staff will immediately notify Contractor <br /> and Engineer upon receiving analysis results. <br /> Upon receiving passing test results, flush disinfectant solution from the newly-laid I <br /> mains until the replacement water throughout the length of the main tests having a <br /> level of free chlorine residual representative of the distribution system water supply. <br /> 7-09.3(24)1 Sample Collection Taps ' <br /> Provide water sample collection taps at each required sampling location in <br /> accordance with COE Standard Drawing No. 526 and as described in these Special <br /> Provisions. <br /> Locate the end of each water sample collection tap above existing ground level. <br /> Plumb taps to provide downward water flow to allow effective filling of sample <br /> containers. City EMC staff shall have the authority to refuse to conduct sampling <br /> from taps they consider inadequate or not representative of watermain quality. <br /> On mains exceeding 1,200 feet, provide for sample collection at one of the water <br /> services shown on the Plans. If no water services are shown on the Plans, provide <br /> 3/4-inch sampling tap at appropriate locations along the main. <br /> For mid-line service taps not providing future customer service, plumb into dead- <br /> end meter setters and meter boxes at the street or sidewalk edge for use as future <br /> dedicated sampling locations in accordance with COE Standard Drawing No. 526. <br /> Locate sample tap upstream of the flushing hose connection for bacterial and <br /> disinfectant residual sampling. Due to sanitary and representative sampling issues, <br /> use only installed sample taps for collection of free chlorine or bacteriological <br /> samples. <br /> 7-09.3(24)J Repetition of Flushing and Testing <br /> Should the initial disinfection procedure result in an unsatisfactory bacteriological <br /> test, meaning total coliform bacteria is present, repeat the entire flushing and <br /> disinfection procedure until obtaining satisfactory test results. Unsatisfactory test <br /> results indicates Contractor's failure to keep the pipe, sample taps, and temporary <br /> filling attachments clean during construction, or to properly flush and disinfect the <br /> main. <br /> Supplement 7-09.3 by adding the following: <br /> 7-09.3(25) Mechanical Joint Restraining Devices <br /> (******) <br /> Restrain joints at bends, tees, dead ends and connections to existing watermains as <br /> shown on the Plans using mechanical joint restraining devices. <br /> Install joint restraint system in accordance with the manufacturer's recommendations. <br /> 7-09.4 Measurement <br /> Delete all paragraphs of 7-09.4 and substitute the following: ' <br /> Watermain Replacement"U" Division 7—STORM, SEWER,WATER October 1, 2019 <br /> WO No.—UP3698 SP—181 <br />