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SECTION 5 – WATER WORKS <br />80 <br />All hydrants are to be properly supported; and when set, shall be surrounded by 0.50 cubic yards of <br />loose gravel (No. 5 or No. 8), incidental to the hydrant assembly work item. <br />Hydrants shall be painted as shown in Standard Drawing 5-11. <br />5-3.11 COMMERCIAL METERS TWO (2) INCHES AND ABOVE WITH BACKFLOW <br />PREVENTION <br />The preference of the Water Department is that the meter and associated by-pass line be located inside <br />a building utility room. <br />Meters and backflow preventers shall be no closer than twelve (12) inches from the floor and no higher <br />than thirty-six (36) inches and the plumbing center line shall be twelve (12) inches from the wall. <br />Meters require an inlet and an outlet valve with a bypass. The bypass shall be at least one-half (½) the <br />main line size. The bypass is required to have a gate valve. <br />No jumpers are allowed at any time. <br />Floor drains shall be installed as close as possible to the meter and backflow preventer setting. <br />For a turbine meter, a two (2) inch test tee is required downstream of the meter before the outlet valve. <br />A minimum of ten (10) times the pipe diameter [or five (5) times with a strainer] of straight pipe is <br />required before the inlet valve and the meter. Two (2) times the pipe diameter is required on the outlet <br />side. <br />Backflow preventers are required on domestic, irrigation, and fire protection lines as specified by state <br />law and local ordinance. An approved backflow preventer shall be installed after the meter. <br />Reduced pressure zone backflow preventers cannot be installed in pits. <br />On irrigation systems, Pressure Vacuum Breaker (PVB) devices shall be installed a minimum of <br />twelve (12) inches above the highest head. If this requirement cannot be followed, an RPZ type device <br />shall be installed. <br />If water service cannot be interrupted, a comparable backflow device shall be installed in parallel. <br />Failure to follow these guidelines may result in termination of water service. <br />5-4 TESTING <br />5-4.1 TRENCH COMPACTION <br />Refer to Section 4-4.1 for trench compaction requirements.