Laserfiche WebLink
- diameter tapping saddles on the existing and new water mains within 5 feet on <br /> ' either side of the isolation valve . The Contractor shall install 3/4-inch <br /> corporation stops, bushings , and temporary pressure gauges . The new water <br /> main system may then be flushed as followed under the supervision of the <br /> ' Utility Department and Engineer. <br /> 1 ) The Contractor must make a written request to the Indian River <br /> ' County inspection division at least 48 hours prior to the time desired <br /> for flushing . <br /> ' 2) Flushing shall not be requested or attempted during peak demand <br /> hours of the existing water system. <br /> 3 ) All downstream valves in the new system shall be opened prior to <br /> opening the isolation valve . If subsequent downstream valves require <br /> closing to flush only a portion of the new water main system, they shall <br /> rbe individually closed with the pressure drop across the isolation valve <br /> carefully monitored. <br /> 4) The pressure on the upstream side of the isolation valve shall not drop <br /> below 35 psi . The isolation valve shall be throttled as needed to meet <br /> this requirement. <br /> 5 ) The isolation valve may only be opened a portion of the way in order to <br /> maintain a minimum pressure drop across the valve of 15 psi . The <br /> i isolation valve shall be throttled as needed to meet this requirement. <br /> M After completion of flushing, the isolation valve shall be locked in the closed <br /> position until clearance for use from the Florida Department of <br /> Environmental Protection (F . D . E . P .) has been received . After clearance <br /> from F . D . E. P . , the Contractor shall remove all filling and pressure gauges . <br /> The corporation stops shall be turned off and permanent brass plugs shall be <br /> installed in the female ends . <br /> 2 . DISINFECTING POTABLE WATER PIPELINES <br /> A . Before pressure testing against existing water system valves and before being <br /> placed into service , all potable water pipelines shall be chlorinated in <br /> accordance with the latest edition of AWWA C-651 , " Standard Procedure for <br /> Disinfecting Water Mains . " The procedure shall be approved by the <br /> Engineer. The location of the chlorination and sampling points will be as <br /> shown on the Drawings . Taps for chlorination and sampling shall be <br /> uncovered and backfilled by the Contractor as required . <br /> B . The general procedure for chlorination shall be first to flush all dirty or <br /> discolored water from the lines, and then introduce chlorine in approved <br /> i <br /> C ADownload\techspec-02504.doc <br />