N.H. Admin. Code § Env-Ws 382.06

Current through Register No. 45, November 7, 2024

Section Env-Ws 382.06 - Analytical Requirements

(a) A water system shall use the analytical methods specified in Env-C 303.04.

(b) The following documents are incorporated by reference:

(1) EPA Method 552.1 set forth in "Methods for the Determination of Organic Compounds in Drinking Water-Supplement II," USEPA, August 1992;

(2) EPA Methods 502.2, 524.2, 551.1, and 552.2 set forth in "Methods for the Determination of Organic Compounds in Drinking Water-Supplement III," USEPA, August 1995;

(3) EPA Method 300.0 set forth in "Methods for the Determination of Inorganic Substances in Environmental Samples," USEPA, August 1993;

(4) EPA Method 300.1 set forth in "Determination of Inorganic Anions in Drinking Water by Ion Chromatography, Revision 1.0," USEPA, 1997;

(5) Standard Methods 4500-Cl D, 4500-Cl E, 4500-Cl F, 4500-Cl G, 4500-Cl H, 4500-Cl I, 4500-ClO ₂ D, 4500-ClO₂ E, 6251 B, and 5910 B set forth in "Standard Methods for the Examination of Water and Wastewater, 19th Edition," American Public Health Association, 1995;

(6) Standard Methods 5310 B, 5310 C, and 5310 D set forth in "Supplement to the 19th Edition of Standard Methods for the Examination of Water and Wastewater," American Public Health Association, 1996; and

(7) ASTM Method D 1253-86 set forth in "Annual Book of ASTM Standards, Volume 11.01," American Society for Testing and Materials, 1996 edition.

(c) Disinfection byproducts shall be measured by the following methods:

Table 382-1

APPROVED METHODS FOR DISINFECTION BYPRODUCT COMPLIANCE MONITORING

Methodology⁽²⁾	EPA Method	Standard Method	Byproduct Measured⁽¹⁾
Methodology⁽²⁾	EPA Method	Standard Method	TTHM	HAA5	Chlorite⁽⁴⁾	Bromate
P&T/GC/EICD & PID	502.2⁽³⁾	X
P&T/GC/MS	524.2	X
LLE/GC/ECD	551.1	X
LLE/GC/ECD	6251 B	X
SPE/GC/ECD	552.1	X
LLE/GC/ECD	552.2	X
Amperometric Titration	4500-CIO₂E	X
IC	300.0	X
IC	300.1	X	X

(d) The following notes shall apply to Table 382-1:

(1) X shallindicate department approval for measuring specified disinfection byproduct;

(2) Abbreviations shall be as follows:

a. "P&T" means purge and trap;

b. "GC" means gas chromatography;

c. "EICD" means electrolytic conductivity detector;

d. "PID" means photoionization detector;

e. "MS" means mass spectrometer;

f. "LLE" means liquid/liquid extraction;

g. "ECD" means electron capture detector;

h. "SPE" means solid phase extractor; and

i. "IC" means ion chromatography;

(3) If total trihalomethanes (TTHMs) are the only analytes being measured in the sample, then a PID shall not be required;

(4) Amperometric titration may be used for routine daily monitoring of chlorite as specified in Env-Ws 382.10 at the entrance to the distribution system; and

(5) Ion chromatography shall be used for routine monthly monitoring of chlorite and additional monitoring of chlorite in the distribution system.

(e) Analysis for disinfection byproducts shall be conducted by a laboratory that has received accreditation by the department.

(f) To receive accreditation by the department, a laboratory shall perform analyses of performance evaluation samples as specified in Env-C 306.

(g) Chlorite samples collected daily at the entrance to the distribution system pursuant to Env-Ws 382.10 shall be measured by, or under the supervision of, an operator certified under Env-Ws 367.

(h) Residual disinfectant concentrations for free chlorine, combined chlorines, also known as chloramines, and chlorine dioxide shall be measured:

(1) By the use of diethyl-p-phenylene diamine (DPD) colorimetric test kits; or

(2) By measuring the residual disinfectant concentration under the supervision of an operator certified under Env-Ws 367 by using the methods specified in Table 382-2 below, where X shallindicate the method is approved for measuring the specified disinfectant residual:

Table 382-2

APPROVED METHODS FOR DISINFECTANT RESIDUAL COMPLIANCE MONITORING

Methodology	Standard method	ASTM method	Residual Measured ¹
Methodology	Standard method	ASTM method	Free Chlorine	Combined Chlorine	Total Chlorine	Chlorine Dioxide
Amperometric Titration	4500-Cl D	D 1253-86	X	X	X
Low Level Amperometric Titration	4500-Cl E	X
DPD Ferrous Titrimetric	4500-Cl F	X	X	X
DPD Colorimetric	4500-Cl G	X	X	X
Syringaldazine (FACTS)	4500-Cl H	X
Iodometric Electrode	4500-Cl I	X
DPD	4500-ClO₂ D	X
Amperometric Method II	4500-ClO₂ E	X

(i) A certified operator shall monitor the following:

(1) Alkalinity by the methods set forth in 40 CFR 141.89(a);

(2) Bromide by EPA Method 300.0 or EPA Method 300.1;

(3) TOC by one of the following:

a. Standard Method 5310 B;

b. Standard Method 5310 C; or

c. Standard Method 5310 D; and

(4) SUVA as follows:

a. Prior to the addition of disinfectants/oxidants;

b. By separately measuring DOC and UV254 using the methods specified in this section; and

c. DOC and UV₂₅₄ shall be collected at the same time and at the same location.

(j) DOC shall be measured by one of the methods specified in (i)(3), above.

(k) Prior to analysis, DOC samples shall be filtered through a 0.45 µm pore-diameter filter. Water passed through the filter prior to filtration of the sample shall serve as the filtered blank.

(l) The filtered blank shall be analyzed for DOC using one of the methods specified in (i) above, and shall be identical to the method used in the analysis prior to filtration.

(m) The DOC in the filter blank shall be less than 0.5 mg/L.

(n) Acid may be added to the filter blank in accordance with the following:

(1) DOC samples shall be filtered through a 0.45 µm pore-diameter filter prior to acidification;

(2) DOC samples shall be acidified to achieve a pH of less than 2.0 by the minimal addition of phosphoric or sulfuric acid as soon as practical after sampling, but no later than 48 hours after sample collection; and

(3) Acidified DOC samples shall be analyzed within 28 days.

(o) DOC samples not acidified shall be analyzed as soon as practical after sampling, but shall not exceed 48 hours from the time the sample was collected.

(p) UV absorption shall be measured at:

(1) At 253.7 nm, which may be rounded to 254 nm (UV₂₅₄); and

(2) As follows:

a. Samples shall be filtered through a 0.45 µm pore-diameter filter prior to analysis;

b. Samples shall be analyzed by using Method 5910 B;

c. The pH of UV₂₅₄ samples shall not be adjusted; and

d. UV₂₅₄ samples shall be analyzed as soon as practical after collection but no later than 48 hours after sampling.

(q) TOC samples shall not be filtered prior to analysis.

(r) TOC samples shall be acidified to achieve a pH of less than 2.0 by the minimal addition of phosphoric or sulfuric acid as soon as practical after sampling, but no later than 24 hours after sample collection.

(s) Acidified TOC samples shall be analyzed within 28 days.

(t) TOC samples not acidified shall be analyzed as soon as practical after collection but no later than 24 hours after sample collection.

(u) pH shall be measured by the methods set forth in 40 CFR 141.23(k)(1).

N.H. Admin. Code § Env-Ws 382.06

(See third Revision Note at chapter heading Env-Ws 300); #7735, eff 8-2-02