Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart Y - STAGE 2 DISINFECTION BYPRODUCTS REQUIREMENTS
Section 611.979 - Reporting and Recordkeeping Requirements
Universal Citation: 35 IL Admin Code ยง 611.979
Current through Register Vol. 48, No. 38, September 20, 2024
a) Reporting
1) A supplier must report the following
information to the Agency within ten days after the end of any quarter in which
monitoring is required for each monitoring location:
A) The number of samples taken during the
last quarter;
B) The date and
results of each sample taken during the last quarter;
C) The arithmetic average of quarterly
results for the last four quarters for each monitoring location (LRAA),
beginning at the end of the fourth calendar quarter that follows the compliance
date and at the end of each subsequent quarter. If the LRAA calculated based on
fewer than four quarters of data would cause the MCL to be exceeded regardless
of the monitoring results of subsequent quarters, the supplier must report this
information to the Agency as part of the first report due following the
compliance date or anytime thereafter that this determination is made. If the
supplier is required to conduct monitoring at a frequency that is less than
quarterly, it must make compliance calculations beginning with the first
compliance sample taken after the compliance date, unless the supplier is
required to conduct increased monitoring under Section
611.975;
D) A statement whether, based on Section
611.312(b)(2)
and this Subpart Y, the MCL was violated at any monitoring location;
and
E) Any operational evaluation
levels that were exceeded during the quarter and, if so, the location and date,
and the calculated TTHM and HAA5 levels.
2) If a supplier is a Subpart B system
supplier that seeks to qualify for or remain on reduced TTHM and HAA5
monitoring, it must report the following source water TOC information for each
treatment plant that treats surface water or groundwater under the direct
influence of surface water to the Agency within ten days after the end of any
quarter in which monitoring is required:
A)
The number of source water TOC samples taken each month during last
quarter;
B) The date and result of
each sample taken during last quarter;
C) The arithmetic average of monthly samples
taken during the last quarter or the result of the quarterly sample;
D) The running annual average (RAA) of
quarterly averages from the past four quarters; and
E) Whether the RAA exceeded 4.0
mg/l.
3) The Agency may,
by a SEP, choose to perform calculations and determine whether the MCL was
exceeded or the system is eligible for reduced monitoring in lieu of having the
system report that information under this Section.
b) Recordkeeping. A supplier must retain any Subpart Y monitoring plans and the supplier's Subpart Y monitoring results as required by Section 611.860.
BOARD NOTE: Derived from 40 CFR 141.629.
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