South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-58.5 - Maximum Contaminant Levels in Drinking Water › Section 61-58.5.T - Special Monitoring for Inorganic and Organic Contaminants

Current through Register Vol. 48, No. 6, June 28, 2024
(1) All community
			 and non-transient non-community water supply systems shall conduct special
			 monitoring for the following contaminants. Systems serving 10,000 or fewer
			 persons are not required to monitor for the contaminants in the section after
			 December 31, 1998.
Chloroform
1,3-Dichloropropane
Bromodichloromethane
Chloromethane
Chlorodibromomethane
Bromomethane
Bromoform
1,2,3-Trichloropropane
Chlorobenzene
1,1,1,2-Tetrachloroethane
m-Dichlorobenzene
Chloroethane
2,2-Dichloropropane
1,1-Dichloropropene
o-Chlorotoluene
1,1-Dichloroethane
Bromobenzene
1,1,2,2-Tetrachloroethane
1,3-Dichloropropene
p-Chlorotoluene
(2)
			 Monitoring for the organic compounds listed in paragraph (1) of this section,
			 shall begin no later than the date specified below:
Population Served
Initial Monitoring Date
>10,000
No later than January 1, 1988
3,300-10,000
No later than January 1, 1989
<3,300
No later than January 1, 1991
(3)
			 Surface water systems shall sample at points in the distribution system
			 representative of each water source or at entry points to the distribution
			 system after any application of treatment. The minimum number of samples is one
			 year of quarterly samples per water source.
(4) Ground water systems shall sample at
			 points of entry to the distribution system representative of each well after
			 any application of treatment. The minimum number of samples is one (1) sample
			 per entry point to the distribution system.
(5) The Department may require confirmation
			 samples for positive or negative results.
(6) [Reserved]
(7) Analysis under this section shall be
			 conducted using EPA-approved methods listed in 40 CFR 141.
(8) Analysis under this section shall only be
			 performed by laboratories which are certified by the Department.
(9) Public water systems may use monitoring
			 data collected any time after January 1, 1983, to meet the requirements of
			 paragraph (1) of this section, provided that the monitoring program was
			 consistent with the requirements of this section. In addition, the results of
			 EPA's Ground Water Supply Survey may be used in a similar manner for systems
			 supplied by a single well.
(10) At
			 the Department's discretion, community water systems and non-transient
			 non-community water systems may be required to conduct special monitoring for
			 the following contaminants:
1,2,4-Trimethylbenzene
p-Isopropyltoluene
1,2,4-Trichlorobenzene
Isopropylbenzene
1,2,3-Trichlorobenzene
Tert-butylbenzene
n-Propylbenzene
Sec-butylbenzene
n-Butylbenzene
Fluorotrichloromethane
Naphthalene
Dichlorodifluoromethane
Hexachlorobutadiene
Bromochloromethane
1,3,5-Trimethylbenzene
(11)
			 All community and non-transient non-community water systems shall repeat the
			 monitoring required by this Section no less frequently than every five (5)
			 years from the dates specified in paragraph (2) of this section.
(12) The Department or public water systems
			 may composite up to five samples when monitoring for the organic contaminants
			 in paragraphs (1) and (10) of this section.
(13) Monitoring of the contaminants listed in
			 paragraphs (13)(k) and (l) of this section, shall be conducted as follows:
(a) Each community and non-transient,
			 non-community water system shall take four consecutive quarterly samples at
			 each sampling point for each contaminant listed in paragraph (13)(k) of this
			 section and report the results to the Department. Monitoring must be completed
			 by December 31, 1995.
(b) Each
			 community and non-transient non-community water system shall take one sample at
			 each sampling point for each contaminant listed in paragraph (13)(l) of this
			 section and report the results to the Department. Monitoring must be completed
			 by December 31, 1995.
(c) Each
			 community and non-transient non-community water system may apply to the
			 Department for a waiver from the requirements of paragraph (13)(a) and (b) of
			 this section.
(d) The Department
			 may grant a waiver for the requirement of paragraph (13)(a) of this section
			 based on the criteria specified in Section E(7)(f) above. The Department may
			 grant a waiver from the requirement of paragraph (13)(b) of this section if
			 previous analytical results indicate contamination would not occur, provided
			 this data was collected after January 1, 1990.
(e) Groundwater systems shall take a minimum
			 of one (1) sample at every entry point to the distribution system which 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.
(f) Surface water systems
			 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. [Note:
			 For purposes of this paragraph, surface water systems include systems with a
			 combination of surface and ground sources.]
(g) If the 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 (i.e., when water representative of all sources is
			 being used).
(h) The Department may
			 require a confirmation sample for positive or negative results.
(i) The Department may reduce the total
			 number of samples a system must analyze by allowing the use of compositing.
			 Composite samples from a maximum of five (5) sampling points are allowed.
			 Compositing of samples must be done in the laboratory and the composite sample
			 must be analyzed within fourteen (14) days of collection. If the population
			 served by the system is greater than 3,300 persons, then compositing may only
			 be permitted by the Department at sampling points within a single system. In
			 systems serving 3,300 persons or less, the Department may permit compositing
			 among different systems provided the 5-sample limit is maintained.
(j) Instead of performing the monitoring
			 required by this section, a community water system or non-transient
			 non-community water system serving fewer than 150 service connections may send
			 a letter to the Department stating that the system is available for sampling.
			 This letter must be sent to the Department by January 1, 1994. The system shall
			 not send such samples to the Department, unless requested to do so by the
			 Department.
(k) List of Unregulated
			 Organic Contaminants:
Organic Contaminants
EPA Analytical Method
Aldicarb
531.1
Aldicarb sulfone
531.1
Aldicarb sulfoxide
531.1
Aldrin
505, 508, 525.1
Butachlor
507, 525.1
Carbaryl
531.1
Dicamba
515.1
Dieldrin
505, 508, 525.1
3.Hydroxycarbofuran
531.1
Methomyl
531.1
Metolachlor
507, 525.1
Metribuzin
507, 525.1
Propachlor
508, 525.1
(l)
			 List of Unregulated Inorganic Contaminants:
Inorganic Contaminant
EPA Analytical Method
Sulfate
Colorimetric