Statutes, codes, and regulations
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.K - Analytical Methods for Radionuclides

S.C. Code Regs. § § 61-58.5.K

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Current through Register Vol. 48, 12, December 27, 2024
Section 61-58.5.K - Analytical Methods for Radionuclides
(1) Analysis for the following contaminants shall be conducted to determine compliance with Section H above, (radioactivity) in accordance with the methods adopted by the Department.
(2) For the purpose of monitoring radioactivity concentrations in drinking water, the required sensitivity of the radio-analysis is defined in terms of detection limit. The detection limit shall be that concentration which can be counted with a precision of plus or minus one hundred percent at the ninety-five percent confidence level (1.96 sigma where sigma is the standard deviation of the net counting rate of the sample). To determine compliance with Sections H and J above, the detection limits shall not exceed those set form by the Administrator.
(3) To judge compliance with the maximum contaminant levels listed in Sections H and J above, averages of data shall be used and shall be round to the same number of significant figures as the maximum contaminant level for the substance in question.
(a) To determine compliance with Section H(2), (3), and (5) above, the detection limit shall not exceed the concentrations in Table B to this paragraph.

TABLE B: DETECTION LIMITS FOR GROSS ALPHA PARTICLE ACTIVITY, RADIUM 226, RADIUM 228, AND URANIUM

Contaminant

Detection limit

Gross alpha particle activity

3 pCi/L.

Radium 226

1 pCi/L.

Radium 228

1 pCi/L.

Uranium

1 microgram/L

(b) To determine compliance with Section H(4) above, the detection limits shall not exceed the concentrations listed in Table C to this paragraph.

TABLE C: DETECTION LIMITS FOR MAN-MADE BETA PARTICLES AND PHOTON EMITTERS

Contaminant

Detection limit

Tritium

1,000 pCi/l

Strontium-89

10 pCi/l

Strontium - 90

2 pCi/l

Iodine-131

1 pCi/l

Cesium-134

10 pCi/l

Gross Beta

4 pCi/l

Other radionuclides

1/10 of the applicable limit

(4) To judge compliance with the maximum contaminant levels listed in Section H above, averages of data shall be used and shall be rounded to the same number of significant figures as the maximum contaminant level for the substance in question.

S.C. Code Regs. § 61-58.5.K