Section Env-Dw 717.15 - Compliance Monitoring for Systems with Chemical Disinfection Serving 3,300 People or Fewer(a) The requirements of this section shall apply to each groundwater system serving 3,300 or fewer people that meets 4-log treatment using chemical disinfection.(b) The O/O of a groundwater system that is subject to this section shall: (1) Monitor the residual disinfectant concentration using analytical methods specified in 40 CFR 141.74(a)(2) at the approved sampling location, either continuously or on a daily basis by taking a daily grab sample during the hour of peak flow or another time designated by the department;(2) Record the residual disinfectant concentration each day that water is served to the system's customers; and(3) Maintain the department-determined residual disinfectant concentration every day the groundwater system serves water from the groundwater source.(c) The O/O of a groundwater system that is subject to this section shall collect follow-up grab samples every 4 hours if any daily grab sample measurement falls below the established residual concentration level, until the required residual concentration is met.N.H. Code Admin. R. Env-Dw 717.15
Amended by Volume XXXVIII Number 23, Filed June 7, 2018, Proposed by #12525, Effective 6/1/2018, Expires 6/1/2028.