Section Env-Dw 717.09 - Investigative Monitoring to Prove Source is Not Contaminated(a) Investigative monitoring to prove a source is not contaminated shall be as specified in (b) through (e), below.(b) Subject to (c), below, the O/O of a groundwater system shall:(1) Collect 6 source water samples prior to the compliance deadline, one each in March through August, and have the samples analyzed for E. coli in accordance with Env-Dw 717.05; or(2) Collect 6 samples spaced at regular intervals, at least one week apart, within the system's normal operating season if the system does not operate in each of the months March through August, and have the samples analyzed for E. coli in accordance with Env-Dw 717.05.(c) If 6 samples are not collected prior to the compliance deadline, the O/O of the groundwater system shall: (1) Demonstrate that 4-log treatment is being met as specified in Env-Dw 717.13(a) and (b) and be subject to compliance monitoring as specified in Env-Dw 717.13; or(2) Collect one source water sample in each month for 12 months beginning in the month following the month in which the compliance deadline falls and have the samples analyzed for E. coli in accordance with Env-Dw 717.05, except that systems that do not operate throughout the year shall collect 12 source water samples spaced at regular intervals, at least one week apart, within the system's normal operating season.(d) Subject to (e), below, if any of the samples taken pursuant to (b) or (c)(2), above, are E. coli positive, the O/O of the groundwater system shall take corrective action as specified in Env-Dw 717.21, and either: (1) Institute a boil order in accordance with Env-Dw 709.19 and provide notice in accordance with the public notice requirements in Env-Dw 717.23; or(2) Terminate use of the contaminated source and provide water from an alternate source and provide notice in accordance with the public notice requirements in Env-Dw 717.23.(e) If a sample taken pursuant to (b) or (c)(2), above, is invalidated under Env-Dw 717.06, the O/O shall take another sample in: (1) The same month, if notified of the invalidation in sufficient time to do so;(2) The month following the months specified in (b)(1), above, if the samples are taken pursuant to (b)(1), above; or(3) The week following the last regularly-scheduled sample, if the samples are taken pursuant to (b)(2) or (c)(2), above.(f) If the department determines, through a sanitary survey or review of land use activities surrounding the source, that conditions have changed such that a greater risk of fecal contamination exists than was originally present, the department shall direct the system O/O, in writing, to undertake investigative monitoring to determine whether the source has been negatively impacted.N.H. Code Admin. R. Env-Dw 717.09
Amended by Volume XXXVIII Number 23, Filed June 7, 2018, Proposed by #12525, Effective 6/1/2018, Expires 6/1/2028.