Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart Y - STAGE 2 DISINFECTION BYPRODUCTS REQUIREMENTS
Section 611.976 - Operational Evaluation Levels
Universal Citation: 35 IL Admin Code ยง 611.976
Current through Register Vol. 48, No. 38, September 20, 2024
a) A supplier has exceeded the operational evaluation level at any monitoring location where the sum of the two previous quarters' TTHM results plus twice the current quarter's TTHM result, divided by four to determine an average, exceeds 0.080 mg/l, or where the sum of the two previous quarters' HAA5 results plus twice the current quarter's HAA5 result, divided by four to determine an average, exceeds 0.060 mg/l.
b) Effects of Exceeding the Operational Evaluation Level
1) If a supplier exceeds the
operational evaluation level, the supplier must conduct an operational
evaluation and submit a written report of the evaluation to the Agency no later
than 90 days after being notified of the analytical result that causes it to
exceed the operational evaluation level. The written report must be made
available to the public upon request.
2) The supplier's operational evaluation must
include an examination of system treatment and distribution operational
practices, including storage tank operations, excess storage capacity,
distribution system flushing, changes in sources or source water quality, and
treatment changes or problems that may contribute to TTHM and HAA5 formation
and what steps could be considered to minimize future exceedances.
A) A supplier may request and the Agency may
allow the supplier to limit the scope of its evaluation if the supplier is able
to identify the cause of the operational evaluation level exceedance.
B) A supplier's request to limit the scope of
the evaluation does not extend the schedule in subsection (b)(1) for submitting
the written report. The Agency must approve this limited scope of evaluation in
writing, and the supplier must keep that approval with the completed report.
BOARD NOTE: Derived from 40 CFR 141.626.
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