Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 611 - PRIMARY DRINKING WATER STANDARDS › Subpart O - ORGANIC MONITORING AND ANALYTICAL REQUIREMENTS › Section 611.646 - Phase I, Phase II, and Phase V Volatile Organic Contaminants

Current through Register Vol. 48, No. 28, July 12, 2024
Monitoring of the Phase I, Phase II, and Phase V VOCs for the
				  purpose of determining compliance with the MCL must be conducted as
				  follows:
a) Definitions. As used in
				this Section the following have the given meanings:
"Detect" and "detection" mean that the contaminant of
				  interest is present at a level greater than or equal to the "detection
				  limit".
"Detection limit" means 0.0005 mg/l.
BOARD NOTE: Derived from
				  40 CFR
				  141.24(f)(7), (f)(11), (f)(14)(i), and
				  (f)(20). This is a "trigger level" for Phase
				  I, Phase II, and Phase V VOCs inasmuch as it prompts further action. The use of
				  the term "detect" in this Section is not intended to include any analytical
				  capability of quantifying lower levels of any contaminant, or the "method
				  detection limit". Note, however, that certain language at the end of federal
				  paragraph (f)(20) is capable of meaning that the "method detection limit" is
				  used to derive the "detection limit". The Board has chosen to disregard that
				  language at the end of paragraph (f)(20) in favor of the more direct language
				  of paragraphs (f)(7) and (f)(11).
"Method detection limit", as used in subsections (q) and (t)
				  means the minimum concentration of a substance that can be measured and
				  reported with 99 percent confidence that the analyte concentration is greater
				  than zero and is determined from analysis of a sample in a given matrix
				  containing the analyte.
BOARD NOTE: Derived from appendix B to 40 CFR 136. The method
				  detection limit is determined by the procedure set forth in appendix B to 40
				  CFR 136, incorporated by reference in Section
				  611.102(c).
				  See subsection (t).
b)
				Required Sampling. Each supplier must take a minimum of one sample at each
				sampling point at the times required in subsection (u).
c) Sampling Points
1) Sampling Points for a GWS. Unless
				otherwise provided by a SEP granted by the Agency, a GWS supplier must take at
				least one sample from each of the following points: each entry point that is
				representative of each well after treatment.
2) Sampling Points for an SWS or Mixed System
				Supplier. Unless otherwise provided by a SEP granted by the Agency, an SWS or
				mixed system supplier must sample from each of the following points:
A) Each entry point after treatment;
				or
B) Points in the distribution
				system that are representative of each source.
3) The supplier must take each sample at the
				same sampling point unless the Agency has granted a SEP that designates another
				location as more representative of each source, treatment plant, or within the
				distribution system.
4) If a system
				draws water from more than one source, and the sources are combined before
				distribution, the supplier must sample at an entry point during periods of
				normal operating conditions when water is representative of all sources being
				used.
BOARD NOTE: Subsections (b) and (c) derived from
				  40 CFR
				  141.24(f)(1) through
				  (f)(3).