Alabama Administrative Code › Title 335 - ALABAMA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT › WATER DIVISION - WATER SUPPLY PROGRAM › Chapter 335-7-2 - PRIMARY DRINKING WATER STANDARDS › Section 335-7-2-.08 - Radionuclide Standards And Monitoring Requirements

Current through Register Vol. 42, No. 9, June 28, 2024
(1) To determine compliance with the MCLs for
				natural radionuclides in picocuries per liter (pCi/L) listed below, the
				averages of data shall be used and shall be rounded to the same number of
				significant figures as the MCL for the contaminant in question:
Contaminant
MCL
Gross alpha particle
15 pCi/L)1
Combined radium-226 and radium-228
5 pCi/L
Uranium
30 µg/L
1Includes radium 226 but excludes
				  radon & uranium:
(2)
				The MCLs for manmade radionuclides are:
Contaminant
MCL
Tritium
20,000 pCi/L
Strontium 90
8 pCi/L
Beta particle and photon
4 millirem/year radioactivity
(3)
				To determine compliance the detection limits shall not exceed the
				concentrations listed below:
Contaminant
Detection Limit
Gross Alpha Particle Activity
3 pCi/L
Radium 226
1 pCi/L
Radium 228
1 pCi/L
Uranium
1 µg/L
Tritium
1,000 pCi/L
Strontium-89
10 pCi/L
Strontium-90
2 pCi/L
Iodin-131
1 pCi/L
Cesium 134
10 pCi/L
Gross Beta
4 pCi/L
Other Radionuclides
1/10 of the MCL
(4)
				Monitoring requirements for gross alpha particle activity, radium-226,
				radium-228 and Uranium in community water systems are as follows:
(a) Initial monitoring for all community
				system sources to determine compliance for naturally occurring radionuclides
				shall be completed by December 31, 2007. Community water systems utilizing
				surface and/or groundwater sources shall monitor at every entry point to the
				distribution system that is representative each source of water used after any
				application of treatment. Community water systems using water from more than
				one source and blending prior to the entry point to the distribution system
				must sample at the entry point to the distribution system during periods of
				normal operating conditions. Sampling of raw water from each source may be
				required if a contaminant is detected. New community water systems or community
				water systems that use a new source of water must begin monitoring in the first
				quarter after initiating use of the source. Community water systems must
				conduct more frequent monitoring if there are conditions determined by the
				Department that may increase the concentration of radioactivity in finished
				water. All samples collected from each entry point must be collected at the
				same sampling point.
1. Systems without
				acceptable previous monitoring data must monitor for four consecutive quarters
				at all sampling points before December 31, 2007.
2. Appropriate monitoring data from each
				entry point for the last compliance monitoring period that began between June
				2000 and December 8, 2003 may be used to satisfy initial monitoring
				requirements.
3. The Department may
				waive the final two quarters of initial monitoring if the results of the
				monitoring from the previous two quarters are below the detection
				limit.
4. A gross alpha particle
				activity measurement may be substituted for the required radium-226 analyses,
				provided that the measured gross alpha particle activity does not exceed five
				pCi/L. A gross alpha particle activity measurement may be substituted for the
				required Uranium analyses, provided that the measured gross alpha particle
				activity does not exceed 15 pCi/L. A gross alpha measurement shall have a
				confidence level of 95 percent (1.65a, where a is the standard deviation of the
				net counting rate of the sample) for Radium 226 and Uranium. When a system uses
				a gross alpha particle activity measurement in lieu of a radium-226 and/or
				uranium measurement, the gross alpha particle activity analytical result will
				be used to determine the future monitoring frequency for radium-226 and/or
				uranium. If the gross alpha particle activity result is less than detection,
				one half the detection limit will be used to determine compliance and the
				future monitoring frequency.