Ill. Admin. Code tit. 35, § 611.732 - Beta Particle and Photon Radioactivity
Monitoring and Compliance for Manmade Radioactivity. To determine compliance with the maximum contaminant levels in Section 611.330(d) for beta particle and photon radioactivity, a supplier must monitor at a specified frequency:
a) If the Agency issues a
SEP designating a CWS supplier (either a surface water or groundwater supplier)
as vulnerable, the supplier must sample for beta particle and photon
radioactivity. The supplier must collect quarterly samples for beta emitters
and annual samples for tritium and strontium-90 at each entry point to the
distribution system (hereafter called a sampling point) beginning within one
quarter after the Agency issued the SEP. A supplier the Agency designates must
continue to sample until the Agency issues a new SEP removing the designation.
1) If the gross beta particle activity minus
the naturally occurring potassium-40 beta particle activity at a sampling point
has a running annual average (computed quarterly) less than or equal to 50
pCi/L (the screening level), the Agency may reduce the monitoring frequency at
that sampling point to once every three years. A supplier must collect all
required samples during the reduced monitoring period.
2) For a supplier in the vicinity of a
nuclear facility, the Agency may issue a SEP allowing the CWS supplier to use
environmental surveillance data the nuclear facility collected in lieu of
monitoring at the supplier's entry points upon determining the nuclear
facility's data are pertinent to the supplier's system. If a release from a
nuclear facility occurs, a supplier using surveillance data must begin
monitoring at the CWS's entry points under subsection (b)(1).
b) A CWS supplier (either a
surface water or groundwater supplier) the Agency designates in a SEP as using
source water contaminated by effluent from a nuclear facility must sample for
beta particle and photon radioactivity. The supplier must collect quarterly
samples for beta emitters and iodine-131 and annual samples for tritium and
strontium-90 at each entry point to its distribution system (a sampling point)
beginning within one quarter after the Agency issues the SEP. A supplier
already designated by the Agency as a supplier using waters contaminated by
effluents from nuclear facilities must continue to sample until the Agency
reviews and issues a SEP removing the designation.
1) The supplier must base quarterly
monitoring for gross beta particle activity on analysis of monthly samples or
the analysis of a composite of three monthly samples.
BOARD NOTE: In corresponding 40 CFR 141.26(b)(2)(i), USEPA recommends using composite samples.
2) For iodine-131, the supplier must analyze
a composite of five consecutive daily samples once each quarter. The Agency
must issue a SEP requiring more frequent monitoring for iodine-131 if analysis
identifies iodine-131 in the finished water.
3) The supplier must annually monitor for
strontium-90 and tritium using a composite of four consecutive quarterly
samples or four quarterly samples.
BOARD NOTE: In corresponding 40 CFR 141.26(b)(2)(iii), USEPA recommends using four consecutive quarterly samples.
4) If the gross beta particle activity minus
the naturally occurring potassium-40 beta particle activity at a sampling point
has a running annual average (computed quarterly) less than or equal to 15
pCi/L, the Agency may issue a SEP reducing the frequency of monitoring at that
sampling point to once every three years. The supplier must collect the samples
subsection (b) requires during the reduced monitoring period.
5) For a supplier in the vicinity of a
nuclear facility, the Agency may issue a SEP allowing the CWS to use
environmental surveillance data the nuclear facility collected in lieu of
monitoring at the system's entry points upon determining the nuclear facility's
the Agency a SEP that data are pertinent to the supplier's system. If a release
from a nuclear facility occurs, a supplier using surveillance data must begin
monitoring at the CWS's entry points under subsection (b)(1).
c) A CWS supplier the Agency
designates to monitor for beta particle and photon radioactivity cannot apply
to the Agency for a waiver from the monitoring frequencies in subsection (a) or
(b).
d) A CWS supplier may analyze
for naturally occurring potassium-40 beta particle activity using the same or
an equivalent sample it used for the gross beta particle activity analysis. A
supplier may subtract the potassium-40 beta particle activity value from the
total gross beta particle activity value to determine if it exceeded the
screening level. The supplier must calculate potassium-40 beta particle
activity by multiplying elemental potassium concentrations (in mg/L) by a
factor of 0.82 pCi/mg.
e) If the
gross beta particle activity minus the naturally occurring potassium-40 beta
particle activity exceeds the appropriate screening level, the supplier must
analyze the sample to identify the major radioactive constituents present in
the sample, as well as calculate and sum the appropriate doses to determine
compliance with Section
611.330(d)(1)
using the formula in Section
611.330(d)(2).
The suppler must also calculate and combine doses for measured levels of
tritium and strontium to determine compliance.
f) A supplier must monitor monthly at the
sampling points exceeding the MCL in Section
611.330(d)
beginning the month after the exceedance occurs. A supplier must continue
monthly monitoring until the supplier has established that it meets the MCL by
a rolling average of three monthly samples. A supplier establishing that it
meets the MCL must return to quarterly monitoring until it complies with
subsection (a)(1) or (b)(4).
Notes
Amended at 37 Ill. Reg. 1978, effective February 4, 2013
BOARD NOTE: This Section derives from 40 CFR 141.26(b).
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.