Indiana Administrative Code › Title 327 - WATER POLLUTION CONTROL DIVISION › Article 8 - PUBLIC WATER SUPPLY › Rule 2 - Drinking Water Standards › Section 2-5.5 - Collection of samples for volatile organic compound testing other than total trihalomethanes; community and nontransient noncommunity water systems

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. 5.5.
CWSs and NTNCWSs shall collect samples for volatile organic
				  compound testing in order to determine compliance with section 5.4 of this
				  rule, beginning with the initial compliance period, 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). Each sample must be taken at the same sampling point, unless conditions
				make another sampling point more representative of each source or treatment
				plant, or within the distribution system.
(2) Surface water systems (or combined
				surface/ground) shall take a minimum of one (1) sample at points in the
				distribution system that are representative of each source or at each entry
				point to the distribution system after treatment (hereafter called a sampling
				point). Each sample must be taken at the same sampling point, unless conditions
				make another sampling point more representative of each source or treatment
				plant, or within the distribution system.
(3) If the system draws water from more than
				one (1) source and sources are combined before distribution, the system must
				sample at an entry point to the distribution system during periods of normal
				operating conditions such as when water representative of all sources is being
				used.
(4) Each CWS and NTNCWS shall
				take four (4) consecutive quarterly samples for each contaminant listed in
				section 5.4 of this rule, except vinyl chloride, during each compliance period,
				beginning in the initial compliance period.
(5) If the initial monitoring for
				contaminants listed in section 5.4 of this rule, as allowed by subdivision
				(16), has been completed by December 31, 1992, and the system did not detect
				any contaminant listed in section 5.4 of this rule, then each ground and
				surface water system shall take one (1) sample annually beginning with the
				initial compliance period.
(6)
				After a minimum of three (3) years of annual sampling, the commissioner may
				allow ground water systems with no previous detection of any contaminant listed
				in section 5.4 of this rule to take one (1) sample during each compliance
				period.
(7) Each community and
				nontransient noncommunity ground water system that does not detect a
				contaminant listed in section 5.4 of this rule may apply to the commissioner
				for a waiver from the requirements of subdivisions (5) and (6) after completing
				the initial monitoring. As used in this section, "detection" means greater than
				or equal to five ten-thousandths (0.0005) milligram per liter. A waiver shall
				be effective for no more than six (6) years (two (2) compliance periods). The
				commissioner may also issue waivers to small systems for the initial round of
				monitoring for 1,2,4-trichlorobenzene.
(8) The commissioner may grant a waiver after
				evaluating the following factors:
(A)
				Knowledge of previous use (including transport, storage, or disposal) of the
				contaminant within the watershed or zone of influence of the system. If a
				determination by the commissioner reveals no previous use of the contaminant
				within the watershed or zone of influence, a waiver may be granted.
(B) If previous use of the contaminant is
				unknown or if the contaminant has been used previously, then the following
				factors shall be used to determine whether a waiver is granted:
(i) Previous analytical results.
(ii) The proximity of the system to a
				potential point or nonpoint source of contamination. Point sources include
				spills and leaks of chemicals at or near a water treatment facility or at
				manufacturing, distribution, or storage facilities, or from hazardous and
				municipal waste landfills and other waste handling or treatment
				facilities.
(iii) The environmental
				persistence and transport of the contaminants.
(iv) The number of persons served by the
				public water system, and the proximity of a smaller system to a larger
				system.
(v) How well the water
				source is protected against contamination, such as whether it is a surface or
				ground water system. Ground water systems must consider factors such as the
				depth of the well, the type of soil, and wellhead protection. Surface water
				systems must consider watershed protection.