South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-58.15 - Stage 2 Disinfection Byproducts Requirements › Section 61-58.15.B - General Requirements

Current through Register Vol. 48, No. 6, June 28, 2024
(1) The
			 requirements of this part R.61-58.15 constitute national
			 primary drinking water regulations. The regulations in this part establish
			 monitoring and other requirements for achieving compliance with maximum
			 contaminant levels based on locational running annual averages (LRAA) for total
			 trihalomethanes (TTHM) and haloacetic acids (five)(HAA5), and for achieving
			 compliance with maximum residual disinfectant levels for chlorine and
			 chloramine for certain consecutive systems.
(2) Schedule - Systems subject to this part
			 R.61-58.15 must comply with the
			 requirements of this part on the following schedule:
(a) Systems that are not part of a combined
			 distribution system and systems that serve the largest population in the
			 combined distribution system and serve 100,000 people or greater must comply
			 with this part R.61-58.15 by April 1,
			 2012.
(b) Systems that are not part
			 of a combined distribution system and systems that serve the largest population
			 in the combined distribution system and serve between 50,000 and 99,999 people
			 must comply with this part R.61-58.15 by October 1,
			 2012.
(c) Systems that are not part
			 of a combined distribution system and systems that serve the largest population
			 in the combined distribution system and serve between 10,000 and 49,999 people
			 must comply with this part R.61-58.15 by October 1,
			 2013.
(d) Systems that are not part
			 of a combined distribution system and systems that serve the largest population
			 in the combined distribution system and serve less than 10,000 must comply with
			 this part R.61-58.15 by October 1, 2013
			 if no Cryptosporidium monitoring is required under R.61-58.10.K(2)(a)(iv),
			 or by October 1, 2014 if Cryptosporidium monitoring is required under
			 R.61-58.10.K(2)(a)(iv).
(e) Systems that are part of a combined
			 distribution system must comply with this part R.61-58.15 at the same time as
			 the system with the earliest compliance date in the combined distribution
			 system.
(f) The Department may
			 grant systems up to an additional 24 months from the specified date for
			 compliance with MCLs and operational evaluation levels if capital improvements
			 are required to comply with an MCL.
(g) Systems monitoring frequency is specified
			 in R.61-58.15.C(1)(b)
(i) If systems are required to conduct
			 quarterly monitoring, then they must begin monitoring in the first full
			 calendar quarter that includes the compliance date in this paragraph
			 (2).
(ii) If systems are required
			 to conduct monitoring at a frequency that is less than quarterly, then they
			 must begin monitoring in the calendar month recommended in the IDSE report
			 prepared under R.61-58.14.C or
			 R.61-58.14.D or the calendar month identified in the monitoring plan developed
			 under R.61-58.15.D
			 no later than 12 months after the compliance date in this paragraph
			 (2).
(h) If systems are
			 required to conduct quarterly monitoring, then they must make compliance
			 calculations at the end of the fourth calendar quarter that follows the
			 compliance date and at the end of each subsequent quarter (or earlier if the
			 LRAA calculated based on fewer than four quarters of data would cause the MCL
			 to be exceeded regardless of the monitoring results of subsequent quarters). If
			 systems are required to conduct monitoring at a frequency that is less than
			 quarterly, then they must make compliance calculations beginning with the first
			 compliance sample taken after the compliance date.
(i) [Reserved]
(j) For the purpose of the schedule in this
			 paragraph (2), the Department may determine that the combined distribution
			 system does not include certain consecutive systems based on factors such as
			 receiving water from a wholesale system only on an emergency basis or receiving
			 only a small percentage and small volume of water from a wholesale system. The
			 Department may also determine that the combined distribution system does not
			 include certain wholesale systems based on factors such as delivering water to
			 a consecutive system only on an emergency basis or delivering only a small
			 percentage and small volume of water to a consecutive system.