N.H. Admin. Code § Env-Dw 714.09

Current through Register No. 50, December 12, 2024

Section Env-Dw 714.09 - Monitoring Requirements for Water Quality Parameters

(a) The O/O of a water system that is subject to this part shall comply with the monitoring requirements for water quality parameters specified in 40 CFR § 141.87, 7-1-16 edition, as modified by Table 714-1, below, subject to the notes in (b), below:

Table 714-1: Summary of Monitoring Requirements for Water Quality Parameters

Monitoring period; Location	Parameters	Frequency
Initial water quality monitoring:
- Taps - Entry point(s) to distribution system	- pH - alkalinity - conductivity - water temperature - calcium A - orthophosphate B - silica C	As specified in 40 CFR § 141.87, except that the frequency shall be twice in 90 days after the date of action level exceedance
Routine water quality monitoring:
- Taps	- pH - alkalinity - calcium A - orthophosphate B - silica C	As specified in 40 CFR § 141.87, except that the frequency shall be every 3 months for parameters to be reported twice during each monitoring period
- Entry point(s) to distribution system	- pH - alkalinity D - inhibitor E	No less frequently than every 2 weeksF
Optimal water quality parameters:
- Taps	- pH - alkalinity - calcium A orthophosphate B - silica C	Every 6 months
- Entry points(s) to distribution system	- pH - alkalinityD - inhibitor E	No less frequently than every 2 weeks F
Reduced water quality monitoring:
- Taps	- pH - alkalinity - calcium A - orthophosphate B - silica C	Every 6 months, annually or every 3 years; reduced number of sites
- Entry point(s) to distribution system	- pH - alkalinityD - inhibitor E	No reductions; continues no less frequently than every 2 weeks F

(b) The following notes shall apply to Table 714-1:

(1) "A" means that calcium analysis is required only if calcium carbonate stabilization is used as part of corrosion control;

(2) "B" means that orthophosphate analysis is required only if an inhibitor containing a phosphate compound is used;

(3) "C" means that silica analysis is required only if an inhibitor containing a silicate compound is used;

(4) "D" means that analysis of the dosage rate of the chemical used to adjust alkalinity and the alkalinity concentration is required only if alkalinity is adjusted as part of corrosion control;

(5) "E" means that analysis of the dosage rate of the inhibitor used and the concentration of orthophosphate or silica, as applicable, is required only if a corrosion inhibitor is used as part of corrosion control; and

(6) "F" means that the system O/O shall maintain a log which identifies, for each sample taken, the date the sample was taken, the sampling location, and the result.

N.H. Admin. Code § Env-Dw 714.09

#9859, eff 2-8-11 (See Revision Note #4 at chapter heading for Env-Dw 700)

Amended by Volume XXXVII Number 23, Filed June 8, 2017, Proposed by #12181, Effective 5/23/2017, Expires 5/23/2027.