Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart O - ORGANIC MONITORING AND ANALYTICAL REQUIREMENTS
Section 611.648 - Phase II, Phase IIB, and Phase V Synthetic Organic Contaminants
Current through Register Vol. 48, No. 38, September 20, 2024
Analysis of the Phase II, Phase IIB, and Phase V SOCs for the purposes of determining compliance with the MCL must be conducted as follows:
a) Definitions. As used in this Section, the following terms will have the following meanings:
"Detect" or "detection" means that the contaminant of interest is present at a level greater than or equal to the "detection limit".
"Detection limit" means the level of the contaminant of interest that is specified in subsection (r).
BOARD NOTE: This is a "trigger level" for Phase II, Phase IIB, and Phase V SOCs inasmuch as it prompts further action. The use of the term "detect" or "detection" in this Section is not intended to include any analytical capability of quantifying lower levels of any contaminant, or the "method detection limit".
b) Required Sampling. Each supplier must take a minimum of one sample at each sampling point at the times required in subsection (q).
BOARD NOTE: See the Board note appended to Section 611.311(c) for information relating to implementation of requirements relating to aldicarb, aldicarb sulfone, and aldicarb sulfoxide.
c) Sampling Points
BOARD NOTE: Subsections (b) and (c) derive from 40 CFR 141.24(h)(1) through (h)(3).
d) Monitoring Frequency
e) Reduction to Annual Monitoring Frequency. A CWS or NTNCWS supplier may apply to the Agency for a SEP releasing the supplier from the requirements of subsection (d). A SEP from the requirement of subsection (d) may last for only a single three-year compliance period.
f) Vulnerability Assessment. The Agency must issue a SEP from the requirements of subsection (d) based on consideration of the factors set forth at Section 611.110(a).
g) If one of the Phase II, Phase IIB, or Phase V SOCs is detected in any sample, then the following must occur:
aldicarb
aldicarb sulfone
aldicarb sulfoxide
BOARD NOTE: See the Board note appended to Section 611.311(c) for information relating to implementation of requirements relating to aldicarb, aldicarb sulfone, and aldicarb sulfoxide.
heptachlor
heptachlor epoxide.
h) Quarterly Monitoring Following MCL Violations
i) Confirmation Samples
j) This subsection (j) corresponds with 40 CFR 141.24(h)(10), an optional USEPA provision relating to compositing of samples that USEPA does not require for state programs. This statement maintains structural consistency with USEPA rules.
k) Compliance with the MCLs for the Phase II, Phase IIB, and Phase V SOCs must be determined based on the analytical results obtained at each sampling point. If one sampling point is in violation of an MCL, the supplier is in violation of the MCL.
l) This subsection (l) corresponds with 40 CFR 141.24(h)(12), which USEPA removed and reserved. This statement maintains structural consistency with the federal regulations.
m) Analysis for PCBs must be conducted as follows using the methods in Section 611.645:
n) This subsection (n) corresponds with 40 CFR 141.24(h)(14), an obsolete provision that relates to the initial compliance period from 1993 through 1995. This statement maintains consistency with the federal regulations.
o) The Agency must issue a SEP increasing the number of sampling points or the frequency of monitoring if it determines that this is necessary to detect variations within the PWS due to such factors as fluctuations in contaminant concentration due to seasonal use or changes in the water source.
BOARD NOTE: At 40 CFR 141.24(h)(15), the factors are non-limiting examples of circumstances making additional monitoring necessary.
p) This subsection (p) corresponds with 40 CFR 141.24(h)(16), a USEPA provision relating to reserving enforcement authority to the State that would serve no useful function as part of the State's rules. This statement maintains structural consistency with USEPA rules.
q) Each supplier must monitor, within each compliance period, at the time designated by the Agency in a SEP.
r) "Detection" means greater than or equal to the following concentrations for each contaminant:
Aroclor |
Detection Limit (mg/L) |
1016 |
0.00008 |
1221 |
0.02 |
1232 |
0.0005 |
1242 |
0.0003 |
1248 |
0.0001 |
1254 |
0.0001 |
1260 |
0.0002 |
Contaminant |
Detection Limit (mg/L) |
Alachlor |
0.0002 |
Aldicarb |
0.0005 |
Aldicarb sulfoxide |
0.0005 |
Aldicarb sulfone |
0.0008 |
Atrazine |
0.0001 |
Benzo(a)pyrene |
0.00002 |
Carbofuran |
0.0009 |
Chlordane |
0.0002 |
2,4-D |
0.0001 |
Dalapon |
0.001 |
1,2-Dibromo-3-chloropropane (DBCP) |
0.00002 |
Di(2-ethylhexyl)adipate |
0.0006 |
Di(2-ethylhexyl)phthalate |
0.0006 |
Dinoseb |
0.0002 |
Diquat |
0.0004 |
Endothall |
0.009 |
Endrin |
0.00001 |
Ethylene dibromide (EDB) |
0.00001 |
Glyphosate |
0.006 |
Heptachlor |
0.00004 |
Heptachlor epoxide |
0.00002 |
Hexachlorobenzene |
0.0001 |
Hexachlorocyclopentadiene |
0.0001 |
Lindane |
0.00002 |
Methoxychlor |
0.0001 |
Oxamyl |
0.002 |
Picloram |
0.0001 |
Polychlorinated biphenyls (PCBs) (as decachlorobiphenyl) |
0.0001 |
Pentachlorophenol |
0.00004 |
Simazine |
0.00007 |
Toxaphene |
0.001 |
2,3,7,8-TCDD (dioxin) |
0.000000005 |
2,4,5-TP (silvex) |
0.0002 |
BOARD NOTE: See the Board note appended to Section 611.311(c) for information relating to implementation of requirements relating to aldicarb, aldicarb sulfone, and aldicarb sulfoxide.
s) Laboratory Certification
SOC |
Acceptance Limits |
Alachlor |
± 45% |
Aldicarb |
2 standard deviations |
Aldicarb sulfone |
2 standard deviations |
Aldicarb sulfoxide |
2 standard deviations |
Atrazine |
± 45% |
Benzo(a)pyrene |
2 standard deviations |
Carbofuran |
± 45% |
Chlordane |
± 45% |
Dalapon |
2 standard deviations |
Di(2-ethylhexyl)adipate |
2 standard deviations |
Di(2-ethylhexyl)phthalate |
2 standard deviations |
Dinoseb |
2 standard deviations |
Diquat |
2 standard deviations |
Endothall |
2 standard deviations |
Endrin |
± 30% |
Glyphosate |
2 standard deviations |
Dibromochloropropane (DBCP) |
± 40% |
Ethylene dibromide (EDB) |
± 40% |
Heptachlor |
± 45% |
Heptachlor epoxide |
± 45% |
Hexachlorobenzene |
2 standard deviations |
Hexachlorocyclopentadiene |
2 standard deviations |
Lindane |
± 45% |
Methoxychlor |
± 45% |
Oxamyl |
2 standard deviations |
PCBs (as decachlorobiphenyl) |
0-200% |
Pentachlorophenol |
± 50% |
Picloram |
2 standard deviations |
Simazine |
2 standard deviations |
Toxaphene |
± 45% |
2,4-D |
± 50% |
2,3,7,8-TCDD (dioxin) |
2 standard deviations |
2,4,5-TP (silvex) |
± 50% |
BOARD NOTE: See the Board note appended to Section 611.311(c) for information relating to implementation of requirements relating to aldicarb, aldicarb sulfone, and aldicarb sulfoxide.
t) A new system supplier or a supplier using a new source of water must demonstrate compliance with the MCL within a period of time specified by a permit issued by the Agency. The supplier must also comply with the initial sampling frequencies specified by the Agency to ensure the supplier can demonstrate compliance with the MCL. Routine and increased monitoring frequencies must be conducted in accordance with the requirements in this Section.
BOARD NOTE: This Section derives from 40 CFR 141.24(h).