Section Env-Dw 717.10 - Investigative Monitoring to Discontinue 4-log Treatment(a) After the compliance deadline, the O/O of a groundwater system that disinfects to 4-log treatment shall not discontinue 4-log treatment unless: (1) No significant deficiencies related to source water integrity as specified in Env-Dw 717.20 were identified within the prior 5 years;(2) No microbiological violations as specified in Env-Dw 709 have occurred within the prior 3 years;(3) The O/O demonstrates that the source water is free from fecal contamination in accordance with (b), below; and(4) The O/O has submitted a written request pursuant to (c), below, that has been approved pursuant to (d), below.(b) To demonstrate that the source water is free from fecal contamination, the O/O of a groundwater system shall: (1) Collect a source water sample in each of 12 consecutive months and have each sample analyzed for E. coli, unless an alternate sampling schedule has been approved by the department in accordance with (f), below; and(2) Provide evidence that all analytical results show the absence of E. coli.(c) The O/O of a groundwater system who wants to discontinue providing 4-log treatment shall request to be removed from disinfection and compliance monitoring as required in Env-Dw 717.13 through Env-Dw 717.17 by submitting the following information in writing to the department:(1) The system's name and PWS identifier;(2) The name, daytime telephone number, and, if available, e-mail address for the system's representative who can be contacted by the department regarding the request;(3) A full explanation of why disinfection is no longer needed; and(4) Documentation to show that the criteria in (a)(1)-(3) and (b), above, are met.(d) The department shall approve the request if the request demonstrates that the criteria specified in (a)(1)-(3) and (b) are met.(e) The department shall notify the system O/O of its decision on the request in writing. If the department denies the request, the notice shall specify the reason(s) for the denial.(f) The O/O of a groundwater system may request a reduction in the number of samples required by (b), above, by providing information to the department, in writing, which demonstrates that the disinfection was installed: (1) For a system deficiency that has been corrected rather than due to a contaminated source; or(2) As a proactive, safety measure, even though the system had not experienced bacteria contamination, and that the system has been free of any coliform bacteria for a minimum of 3 years.N.H. Code Admin. R. Env-Dw 717.10
Amended by Volume XXXVIII Number 23, Filed June 7, 2018, Proposed by #12525, Effective 6/1/2018, Expires 6/1/2028.