12 Va. Admin. Code § 5-590-388 - Radiological compliance
A.
MCLGs for radionuclides are listed in Table 546.1 of
12VAC5-590-546 B.
B. PMCLs for radionuclides are
applicable to community waterworks only and are listed in Table 340.4.
Compliance with PMCLs will be determined based on the analytical results
obtained at each entry point. If the sample result at one entry point exceeds
the PMCL, then the owner is in violation of the PMCL.
1. For the owner that is monitoring more than
once per year, compliance with the PMCL is determined by an RAA of the
analytical results at each entry point. If the average result at any entry
point is greater than the PMCL, then the waterworks is out of compliance with
the PMCL.
2. For the owner of a
waterworks that monitors more than once per year, if any sample result will
cause the RAA to exceed the PMCL at any entry point, then the waterworks is out
of compliance with the PMCL immediately.
3. All samples collected and analyzed under
the provisions
12VAC5-590-378 shall be included
in determining compliance, even if that number is greater than the minimum
required.
4. If the owner does not
collect all required samples when compliance is based on an RAA result of
quarterly samples, then compliance will be based on the RAA result of the
samples collected.
5. If a sample
result is less than the detection limit as specified in Table 378.1, then zero
will be used to calculate the RAA unless a gross alpha particle activity result
is being used instead of radium-226 or uranium. If the gross alpha particle
activity result is less than the detection limit as specified in Table 378.1,
then one half the detection limit will be used to calculate the RAA.
C. Radiological (gross alpha,
combined radium-226 and radium-228, uranium, and man-made radioactivity).
1. Compliance with the radiological PMCLs
shall be based on the RAA results. PMCLs are indicated in Table 340.4. Sampling
for radiological analysis shall be in compliance with
12VAC5-590-378.
2. Compliance shall be determined by rounding
off results to the same number of significant figures as the PMCL for the
radionuclide in question.
D. If a PMCL for radioactivity listed in
Table 340.4 is exceeded, then the owner shall give notice to the department
pursuant to
12VAC5-590-530 and to the public
as required by
12VAC5-590-540 A
2.
Notes
Statutory Authority: §§ 32.1-12 and 32.1-170 of the Code of Virginia.
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