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C) <br />C> <br />40 <br />0 <br />1 <br />full and prior to flushing, all services and hydrant stuh-out valves shall be <br />t fully closed. The ends of services shalt be secured above ground to prevent <br />backflow front ponded water. <br />D. Flushing shall continue until a minimum water volume of five times the aggregate <br />pipe volume has passed through the pipe section being cleaned. The aggregate <br />pipe volume shall include all pipe carrying flushing water froth the point of <br />introduction to the work to the point(%) of discharge from the rust being cleaned. <br />1 <br />E. Fire hydrants shall not be used as flta%hitlg discharge points. During mann <br />flushing, all hydrant stub -out gate valves and water service curb stops shall <br />remain closed. Upon completion of main flushing, each hydrant and service shall <br />be opened and allowed to flush while the water source is being shut down. <br />F. For nominal pipe sixes of 6 inches and smaller, the pipe shall be flushed through <br />a discharge extension of at least the full pipe diameter. For nominal pipe sizes <br />1 greater than 6 inches, a 6 inch diameter discharge extension pipe, connected to <br />the work with reducer(s), may be used in lieu of a full diameter blowoff. <br />G. Flushing water shall be carried beyond the trench and shall be discharged in a <br />manner that will not cause erosion nor structural damage oat or off-site, and will <br />not cause contravention of State water quality standards in receiving surface <br />waters. The Contractor shall provide adequate extension pipe, sedimentation <br />a basin(s), and/or diffusion devices as necessary to prevent such damage. <br />1 4. HYDROSTATIC LEAKAL � ' ' J PRESSURE TESTING <br />hing, the installed pipe system shall be tested for <br />A. Upon completion of flus <br />tightness under a continuous hydrostatic gauge pressure of 150 psi. + 5 psi, <br />determined at the lowest point in the system, for a period of 4 hours. The <br />allowable leakage rate shall not exceed that defined in and specified by <br />AWWA C600-82, unless otherwise requested by the Engineer prior to testing. <br />I B. If the work is subject to acceptance by a municipal or private utility with its <br />r own adopted teat requirements more stringent than those stated herein with <br />regard to pressure, duration, and/or allowable leakage mate, such <br />1 requirements shall supersede these specifications. <br />1 <br />C. Testing shall be performed separately on each valved -off section of the <br />installed system. Testing shall be against closed in-line valves with each valve <br />in the system subject to file full test pressure differential for full test time at <br />least once during the course of testing. A shore hydrant hrmirll rat aY he tc%I d ars <br />part of its corresponding run by leaving the gate valve aspen and testing <br />against the closed hydrant valve, for the Full test period. `fest pressure shall <br />then be maintained while the gate valve is closed, the hydrant valve opened, <br />and it visual check made for leakage past the gate valve, indicated by water <br />rising in tkte hydrant barrel. <br />D. Allowable Ical:a ge shall be calculated Based on the pii}e diaan ICi( ) a rtil ("i.tl iaid <br />length of the run being tested, with no additional allowance for valves. <br />Wiiaigs, of joints. No visible leakage shall be ailowe4. it visible leakage is <br />noted during the course of testing, or if allowable leakage is rxeeedcd, such <br />2SI <br />