Section Env-Dw 504.06 - Distribution Valve Operation(a) The water system owner shall fully turn each distribution system gate valve either: (1) At least once every 12 months; or(2) At the frequency identified in water system's operations and maintenance manual or rules, provided that not less than 20% of the valves are operated annually and all valves are operated at least once every 5 years.(b) This activity shall be scheduled to minimize the potential impact on customers.N.H. Code Admin. R. Env-Dw 504.06
(See Revision Note at part heading for Env-Dw 504) #10465, eff 12-2-13