Section Env-Dw 405.33 - System Construction(a) All small community water systems and those NTNC water systems important to public health as specified in Env-Dw 405 .02(g) shall comply with this section.(b) No person shall construct a public water system until all required state and local approvals, including water system design approval, have been obtained. If a portion of the water system is to be constructed at a later date, or phased with the actual growth of the development, this shall be indicated at the time of original submittal.(c) Detailed measurements shall be made of the exact location of all buried water distribution piping and related service connections, gate valves, and blow-offs, and recorded on as-built plans or record drawings.(d) The as built plans or record drawings of the water distribution piping system shall conform to the following conditions: (1) Precisely-measured dimensions to all on-line gate valves;(2) Precisely-measured dimensions to all blow-offs;(3) Precisely-measured dimensions to all house service shut-offs;(4) Precisely-measured dimensions to all house service taps to water mains;(5) Precisely-measured dimensions to all water distribution piping at approximately 200 foot intervals; and(6) Precisely-measured dimensions to any principal changes in pipe direction or size.(e) For purposes of this section, "precisely measured" means of sufficient accuracy to locate the piping or appurtenance to within 1 foot accuracy, recorded to the nearest 0.5 foot.(f) The water system owner shall file a copy of the as-built plan or record drawing of the water distribution piping system with dimensions noted with the department and with the entity that operates or will operate the water system.(g) Flushing and chlorination of the water distribution piping system shall be required before use. Before the final certified inspection, the entire water system, distribution pipes, storage tanks and pumps shall be flushed to remove any dirt or other contaminants, and then chlorinated at a concentration of 50 parts per million in accordance with the appropriate AWWA specification, as listed in Env-Dw 407. After 24 hours, the system shall then be flushed again to remove all traces of chlorine and a water sample shall be taken from the end of the distribution system and analyzed for bacterial quality at a laboratory accredited for such test.(h) The water system owner shall perform a leakage test of the piping system before system use. The distribution system shall be checked for leakage by conducting a sustained pressure test for at least 2 hours, in accordance with the appropriate AWWA specification, as listed in Env-Dw 407. Leakage shall not exceed the value given in AWWA specification C 600.N.H. Code Admin. R. Env-Dw 405.33
(See Revision Note at part heading for Env-Dw 405) #10612, eff 6-1-14