Indiana Administrative Code › Title 327 - WATER POLLUTION CONTROL DIVISION › Article 8 - PUBLIC WATER SUPPLY › Rule 2.5 - Disinfectants and Disinfection › Section 2.5-9 - Treatment techniques for control of disinfection byproducts precursors

Current through July 10, 2024
Authority: IC 13-13-5-1; IC 13-14-8-2; IC 13-14-8-7; IC
				  13-18-3-2
Affected: IC 13-12-3-1; IC 13-13-5-2; IC 13-14-9; IC
				  13-18-11
Sec. 9.
(a)
				Applicability is as follows:
(1) Subpart H
				systems using conventional filtration treatment shall operate with enhanced
				coagulation or enhanced softening to achieve the TOC percent removal levels
				specified in subsection (b) unless the system meets at least one (1) of the
				alternative compliance criteria listed in subdivision (2) or (3).
(2) Subpart H systems using conventional
				filtration treatment may use one (1) or more of the following alternative
				compliance criteria to comply with this section instead of complying with
				subsection (b):
(A) The system's source water
				TOC level, measured according to section 5(d)(3) of this rule, is less than two
				and zero-tenths (2.0) milligrams per liter, calculated quarterly as a running
				annual average.
(B) The system's
				treated water TOC level, measured according to section 5(d)(3) of this rule, is
				less than two and zero-tenths (2.0) milligrams per liter, calculated quarterly
				as a running annual average.
(C)
				The system's source water TOC level, measured according to section 5(d)(3) of
				this rule, is less than four and zero-tenths (4.0) milligrams per liter,
				calculated quarterly as a running annual average and the following are met:
(i) The source water alkalinity, measured
				according to section 5(d)(1) of this rule, is greater than sixty (60)
				milligrams per liter (as CaCO3), calculated quarterly as
				a running annual average.
(ii)
				Either of the following:
(AA) The TTHM and
				HAA5 running annual averages are no greater than forty-thousandths (0.040)
				milligram per liter and thirty-thousandths (0.030) milligram per liter,
				respectively.
(BB) Before the
				effective date for compliance in section 4(b) of this rule, the system has made
				a clear and irrevocable financial commitment not later than the effective date
				for compliance in section 4(b) of this rule to use technologies that will limit
				the levels of TTHMs and HAA5 to not more than forty-thousandths (0.040)
				milligram per liter and thirty-thousandths (0.030) milligram per liter,
				respectively. Systems shall submit evidence of a clear and irrevocable
				financial commitment, in addition to a schedule containing milestones and
				periodic progress reports for installation and operation of appropriate
				technologies, to the commissioner for approval not later than the effective
				date for compliance in section 4(b) of this rule. These technologies must be
				installed and operating not later than June 30, 2005.
(D) The TTHM and HAA5 running annual averages
				are not greater than forty-thousandths (0.040) milligram per liter and
				thirty-thousandths (0.030) milligram per liter, respectively, and the system
				uses only chlorine for primary disinfection and maintenance of a residual in
				the distribution system.
(E) The
				system's source water SUVA, before any treatment and measured monthly according
				to section 5(d)(4) of this rule, is less than or equal to two and zero-tenths
				(2.0) liters per milligram meter, calculated quarterly as a running annual
				average.
(F) The system's finished
				water SUVA, measured monthly according to section 5(d)(4) of this rule, is less
				than or equal to two and zero-tenths (2.0) liters per milligram meter,
				calculated quarterly as a running annual average.
(3) Systems practicing
				enhanced softening that cannot achieve the TOC removals required by subsection
				(b)(2) may use the following alternative compliance criteria instead of
				complying with subsection (b):
(A) Softening
				that results in lowering the treated water alkalinity to less than sixty (60)
				milligrams per liter (as CaCO3), measured monthly
				according to section 5(d)(1) of this rule and calculated quarterly as a running
				annual average.
(B) Softening that
				results in removing at least ten (10) milligrams per liter of magnesium
				hardness (as CaCO3), measured monthly according to
				section 5(d)(5) of this rule and calculated quarterly as an annual running
				average.
Systems shall comply with monitoring requirements in section
				  6(d) of this rule.