Ill. Admin. Code tit. 35, § 611.602 - Asbestos Monitoring Frequency
The frequency of monitoring conducted to determine compliance with the MCL for asbestos in Section 611.301 is as follows:
a) Unless the Agency
has determined under subsection (c) that the PWS is not vulnerable, each CWS
and NTNCWS supplier must monitor for asbestos during the first compliance
period of each compliance cycle.
b)
CWS suppliers may apply to the Agency, by way of an application for a SEP, for
a determination that the CWS is not vulnerable based on consideration of the
criteria listed in subsection (c).
c) The Agency must determine that the CWS is
"not vulnerable" if the CWS is not vulnerable to contamination either from
asbestos in its source water, from corrosion of asbestos-cement pipe, or from
both, based on a consideration of the following factors:
1) Potential asbestos contamination of the
water source; and
2) The use of
asbestos-cement pipe for finished water distribution and the corrosive nature
of the water.
d) A SEP
based on a determination that a CWS is not vulnerable to asbestos contamination
expires at the end of the compliance cycle for which it was issued.
e) A supplier of a PWS vulnerable to asbestos
contamination due solely to corrosion of asbestos-cement pipe must take one
sample at a tap served by asbestos-cement pipe and under conditions where
asbestos contamination is most likely to occur.
f) A supplier of a PWS vulnerable to asbestos
contamination due solely to source water must monitor in accordance with
Section
611.601.
g) A supplier of a PWS vulnerable to asbestos
contamination due both to its source water supply and corrosion of
asbestos-cement pipe must take one sample at a tap served by asbestos-cement
pipe and under conditions where asbestos contamination is most likely to
occur.
h) A supplier that exceeds
the MCL, as determined in Section
611.609,
must monitor quarterly beginning in the next quarter after the violation
occurred.
i) Reduction of Quarterly
Monitoring
1) The Agency must issue a SEP
that reduces the monitoring frequency to that specified by subsection (a) if it
determines that the sampling point is reliably and consistently below the
MCL.
2) The request must, at a
minimum, include the following information:
A) For a GWS: two quarterly
samples.
B) For an SWS or mixed
system: four quarterly samples.
3) In issuing a SEP, the Agency must specify
the level of the contaminant upon which the "reliably and consistently"
determination was based. All SEPs that allow less frequent monitoring based on
an Agency "reliably and consistently" determination must include a condition
requiring the supplier to resume quarterly monitoring under subsection (h) if
it violates the MCL specified by Section 611.609.
j) This subsection (j) corresponds with
40 CFR
141.23(b)(10), which
pertains to a compliance period long since expired. This statement maintains
structural consistency with the federal regulations.
Notes
Amended at 27 Ill. Reg. 16447, effective October 10, 2003
BOARD NOTE: Derived from 40 CFR 141.23(b).
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