South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-58.13 - Disinfectant Residuals, Disinfection Byproducts, and Disinfection Byproduct Precursors (Stage 1 Disinfectants and Disinfection Byproducts Rule) › Section 61-58.13.F - Treatment technique for control of disinfection byproduct (DBP) precursors

Current through Register Vol. 48, No. 6, June 28, 2024
(1)
			 Systems using surface water or a ground water under the influence of surface
			 water which utilize conventional filtration treatment must operate with
			 enhanced coagulation or enhanced softening to achieve the TOC percent removal
			 levels specified in paragraph (2) of this section unless the system meets at
			 least one of the alternative compliance criteria listed in paragraph (1)(a) or
			 (1)(b) of this section.
(a) Alternative
			 Compliance Criteria for Enhanced Coagulation and Enhanced Softening Systems -
			 Systems using surface water or a ground water under the influence of surface
			 water which utilize conventional filtration treatment may use the alternative
			 compliance criteria in paragraphs (1)(a)(i) through (vi) of this section to
			 comply with this section in lieu of complying with paragraph (2) of this
			 section. Systems must still comply with monitoring requirements in
			 R.61-58.13.C(4).
(i) The system's source water TOC level,
			 measured according to EPA approved methods specified in
			 40 CFR
			 141.131(d)(3), is less than
			 2.0 mg/L, calculated quarterly as a running annual average.
(ii) The system's treated water TOC level,
			 measured according to EPA approved methods specified in
			 40 CFR
			 141.131(d)(3), is less than
			 2.0 mg/L, calculated quarterly as a running annual average.
(iii) The system's source water TOC level,
			 measured as according to EPA approved methods specified in
			 40 CFR
			 141.131(d)(3), is less than
			 4.0 mg/L, calculated quarterly as a running annual average; the source water
			 alkalinity, measured according to EPA approved methods specified in
			 40 CFR
			 141.131(d)(1), is greater
			 than 60 mg/L (as CaCO3), calculated quarterly as a
			 running annual average; and either the TTHM and HAA5 running annual averages
			 are no greater than 0.040 mg/L and 0.030 mg/L, respectively; or prior to the
			 effective date for compliance in Section B(2) above, the system has made a
			 clear and irrevocable financial commitment not later than the effective date
			 for compliance in Section B(2) above, to use of technologies that will limit
			 the levels of TTHMs and HAA5 to no more than 0.040 mg/L and 0.030 mg/L,
			 respectively. Systems must 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 Department for approval not later than the effective date for compliance in
			 Section B(2) above. These technologies must be installed and operating not
			 later than June 30, 2005. Failure to install and operate these technologies by
			 the date in the approved schedule will constitute a violation of National
			 Primary Drinking Water Regulations.
(iv) The TTHM and HAA5 running annual
			 averages are no greater than 0.040 mg/L and 0.030 mg/L, respectively, and the
			 system uses only chlorine for primary disinfection and maintenance of a
			 residual in the distribution system.
(v) The system's source water SUVA, prior to
			 any treatment and measured monthly according to EPA approved methods specified
			 in
			 40 CFR
			 141.131(d)(4), is less than
			 or equal to 2.0 L/mg-m, calculated quarterly as a running annual
			 average.
(vi) The system's finished
			 water SUVA, measured monthly according to EPA approved methods specified in
			 40 CFR
			 141.131(d)(4), is less than
			 or equal to 2.0 L/mg-m, calculated quarterly as a running annual
			 average.