Section Env-Dw 711.26 - Continued and Revised Monitoring for Nitrite(a) After the initial sample, a PWS for which the analytical result for nitrite is less than 50% of the MCL shall monitor for nitrite annually.(b) The O/O of a community water system, non-transient non-community water system, or transient non-community water system shall monitor for nitrite quarterly for at least one year following any one sample in which the concentration of nitrite is equal to or greater than 50% of the MCL.(c) After a minimum of one year of quarterly sampling, the O/O may submit a written request to the department that the monitoring frequency be reduced.(d) The written request shall include: (2) The PWS identifier for the PWS;(3) A summary of all quarterly sampling results; and(4) Confirmation that the PWS is not operating any type of treatment to reduce the amount of nitrite.(e) The department shall approve a reduction in monitoring from quarterly to annually if the department determines that:(1) Based on 4 consecutive quarterly samples, the nitrite levels are reliably and consistently less than the nitrite MCL; and(2) The PWS is not operating any type of treatment to reduce the amount of nitrite.(f) An O/O who monitors annually shall collect each subsequent sample during the quarter(s) which previously resulted in the highest analytical results.N.H. Code Admin. R. Env-Dw 711.26
(See Revision Note #1 at chapter heading for Env-Dw 700) #9700, eff 5-1-10
Amended by Volume XXXV Number 06, Filed February 12, 2015 , Proposed by #10771, Effective 2/1/2015, Expires2/1/2025.Amended by Volume XXXVIII Number 50, Filed December 13, 2018, Proposed by #12668, Effective 1/1/2019, Expires 1/1/2029.