Indiana Administrative Code › Title 327 - WATER POLLUTION CONTROL DIVISION › Article 8 - PUBLIC WATER SUPPLY › Rule 2 - Drinking Water Standards › Section 2-4.1 - Collection of samples for inorganic chemical testing

Current through July 10, 2024
Authority: IC 13-13-5; IC 13-14-8-7; IC 13-14-9; IC 13-18-3;
				  IC 13-18-16
Affected: IC 13-18
Sec. 4.1.
(a) CWSs
				shall conduct monitoring to determine compliance with the MCLs specified in
				section 4(a), 4(c), and 4(d) of this rule in accordance with this section.
				NTNCWSs shall conduct monitoring to determine compliance with the MCLs
				specified in section 4(a) and 4(d) of this rule in accordance with this
				section. TWSs shall conduct monitoring to determine compliance with the MCLs
				specified in section 4(a) of this rule in accordance with this
				section.
(b) When a contaminant
				listed in section 4 of this rule exceeds the MCL, the supplier of water shall
				report to the commissioner under section 13 of this rule and shall give notice
				to the public under
				327 IAC
				8-2.1-7 through
				327
				IAC 8-2.1-16. Monitoring after public notification
				shall be at a frequency designated by the commissioner and shall continue until
				the MCL has not been exceeded in two (2) successive samples or until a
				monitoring schedule as a condition to an enforcement action shall become
				effective.
(c) Monitoring shall be
				conducted as follows:
(1) Ground water
				systems shall take a minimum of one (1) sample at every entry point to the
				distribution system that is representative of each well after treatment
				(hereafter called a sampling point) beginning in the compliance period starting
				January 1, 1993. The system shall take each sample at the same sampling point
				unless conditions make another sampling point more representative of each
				source or treatment plant.
(2)
				Surface water systems, including systems with a combination of surface and
				ground sources, shall take a minimum of one (1) sample at every entry point to
				the distribution system after any application of treatment or in the
				distribution system at a point that is representative of each source after
				treatment (hereafter called a sampling point) beginning in the compliance
				period beginning January 1, 1993. The system shall take each sample at the same
				sampling point unless conditions make another sampling point more
				representative of each source or treatment plant.
(3) If a system draws water from more than
				one (1) source and the sources are combined before distribution, the system
				must sample at an entry point to the distribution system during periods of
				normal operating conditions, for example, when water is representative of all
				sources being used.
(4) The
				commissioner may reduce the total number of samples that must be analyzed by
				allowing the use of compositing. Composite samples from a maximum of five (5)
				samples are allowed, provided that the detection limit of the method used for
				analysis is less than one-fifth (1/5) of the MCL.
				Compositing of samples must be completed in the laboratory as follows:
(A) When a composite sample is analyzed, if
				the concentration in the composite sample is greater than or equal to one-fifth
				(1/5) of the MCL of any inorganic chemical, then a
				follow-up sample must be analyzed within fourteen (14) days at each sampling
				point included in the composite. These samples must be analyzed for the
				contaminants that exceeded one-fifth (1/5) of the
				MCL in the composite sample. Detection limits for each analytical method and
				MCLs for each inorganic contaminant are the following:
Contaminant
MCL (mg/l)
Methodology
Detection Limit (mg/l)
Antimony
0.006
Atomic absorption; furnace
0.003
Atomic absorption; platform
0.00085
ICP-mass spectrometry
0.0004
Hydride-atomic absorption
0.001
Arsenic
0.0106
Atomic absorption; furnace
0.001
Atomic absorption; platform - stabilized temperature
0.00057
Atomic absorption; gaseous hydride
0.001
ICP-mass spectrometry
0.00148
Asbestos
7 MFL1
Transmission electron microscopy
0.01 MFL
Barium
2
Atomic absorption; furnace
0.002
Atomic absorption; direct aspiration
0.1
Inductively coupled plasma
0.002 (0.001)
Beryllium
0.004
Atomic absorption; furnace
0.0002
Atomic absorption; platform
0.000025
Inductively coupled plasma2
0.0003
ICP-mass spectrometry
0.0003
Cadmium
0.005
Atomic absorption; furnace
0.0001
Inductively coupled plasma
0.001
Chromium
0.1
Atomic absorption; furnace
0.001
Inductively coupled plasma
0.007 (0.001)
Cyanide
0.2
Distillation,
						  spectrophotometric3
0.02
Distillation, automated spectrophotometric 
						  3
0.005
Distillation, selective
						  electrode3
0.05
Distillation, amenable,
						  spectrophotometric4
0.02
Fluoride
4.0
Colorimetric SPADNS; with distillation
0.1
Potentiometric ion selective electrode
0.1
Automated alizarin fluoride blue; with distillation
						  (complexone)
0.05
Automated ion selective electrode
0.1
Mercury
0.002
Manual cold vapor technique
0.0002
Automated cold vapor technique
0.0002
Nitrate
10 (as N)
Manual cadmium reduction
0.01
Automated hydrazine reduction
0.01
Automated cadmium reduction
0.05
Ion selective electrode
1
Ion chromatography
0.01
Nitrite
1 (as N)
Spectrophotometric
0.01
Automated cadmium reduction
0.05
Manual cadmium reduction
0.01
Ion chromatography
0.004
Selenium
0.05
Atomic absorption; furnace
0.002
Atomic absorption; gaseous hydride
0.002
Thallium
0.002
Atomic absorption; furnace
0.001
Atomic absorption; platform
0.00075
ICP-mass spectrometry
0.0003
1 MFL = million
				fibers per liter greater than ten (10) micrometers.
2 Using a 2 × preconcentration step as
				noted in Method 200.7. Lower method detection limits may be achieved when using
				a 4 ×
preconcentration.
3 Screening method for total
				cyanides.
4 Measures "free"
				cyanides.
5 Lower method detection
				limits are reported using stabilized temperature graphite furnace atomic
				absorption.
6 The value for arsenic
				is effective January 1, 2006. Until then, the MCL is 0.05 mg/l.
7 The MDL reported for EPA Method 200.9
				(Atomic Absorption; Platform - Stabilized Temperature) was determined using a
				2× concentration step during sample digestion. The MDL determined for
				samples analyzed using direct analyses, that is, no sample digestion, will be
				higher. Using multiple depositions, EPA 200.9 is capable of obtaining MDL of
				0.0001 mg/l.
8 Using selective ion
				monitoring, EPA Method 200.8 (ICP-MS) is capable of obtaining an MDL of 0.0001
				mg/l.
(B) If the
				population served by the system is greater than three thousand three hundred
				(3,300) persons, then compositing may only be permitted by the commissioner at
				sampling points within a single system. In systems serving fewer than or equal
				to three thousand three hundred (3,300) persons, the commissioner may permit
				compositing among different systems provided the five (5) sample limit is
				maintained.
(C) If duplicates of
				the original sample taken from each sampling point used in the composite sample
				are available, the system may use these instead of resampling. The duplicate
				must be analyzed and the results reported to the commissioner within fourteen
				(14) days after completing analysis of the composite sample, provided the
				holding time of the sample is not exceeded.
(5) The frequency of monitoring for:
(A) asbestos shall be in accordance with
				subsection (d);
(B) antimony,
				arsenic, barium, beryllium, cadmium, chromium, cyanide, fluoride, nickel,
				mercury, selenium, and thallium shall be in accordance with subsection
				(e);
(C) nitrate shall be in
				accordance with subsection (f); and
(D) nitrite shall be in accordance with
				subsection (g).