- (a) Within 90 days after the water system construction is complete, record drawings shall be submitted to the department and to the operator showing precise horizontal dimensional measurements, depth of bury, material type, and nominal size of all buried water mains and piping, gate valves, blow-offs, hydrants, flushing devices, service connections, and utility crossings.
- (b) For purposes of this section, “precise-dimensional measurements” means of sufficient accuracy to locate the facility or appurtenance to within 1 foot accuracy, recorded to the nearest 0.5 foot.
- (c) For NTNC water systems, prior to serving water to the public, the owner shall submit a lead service line inventory and lead service line replacement plan meeting the requirements of 40 CFR 141 Subpart I to the department for review and approval.
(d) The owner shall maintain and update, as necessary, based on the best information available to the owner, the PWS’s:
- (1) Record drawings and tie location records as required by Env-Dw 504.08; and
- (2) Lead service line inventory and replacement plan as required by 403.03(b).
- (e) The owner shall perform a leakage test of the buried water distribution piping system before system use. The water distribution piping system shall be checked for leakage in accordance with the appropriate AWWA standard specified in Env-Dw 402. Leakage shall not exceed the value given in the appropriate AWWA standard specified in Env-Dw 402.
- (f) For all non-community water systems, flushing and chlorination of the water distribution piping system shall be completed before use. Before the inspection of the water system by the department as required by Env-Dw 405.28, the entire water system, distribution pipes, water storage tanks, and pumps shall be flushed to remove any dirt or other contaminants, and then chlorinated in accordance with the appropriate AWWA standard, as specified in Env-Dw 402. After 24 hours, upon completion of the disinfection, the system shall then be flushed again until chlorine residual is less than 0.1 milligrams per liter, and a water sample shall be taken from the end of the distribution system and analyzed for bacterial quality by a laboratory accredited for such test by the New Hampshire environmental laboratory accreditation program.
Source. (See Revision Note at part heading for Env-Dw 405) #10612, eff 6-1-14 New. #14158, eff 12-25-24