Ill. Admin. Code tit. 35, § 611.954 - Disinfection Benchmark
a)
Applicability. A Subpart B system supplier that must develop a disinfection
profile under Section
611.953 must develop a
disinfection benchmark if it decides to significantly change its disinfection
practice. The supplier must receive a SEP from the Agency approving a
significant change before implementing the change in its disinfection
practice.
b) Significant Changes to
Disinfection Practice. Certain changes are significant changes to disinfection
practice:
1) Changing the point for applying
disinfectant;
2) Changing the
applied disinfectant;
3) Changing
the disinfection process; or
4) Any
other modification the Agency identifies.
c) Considering a Significant Change. A
supplier considering a significant change to its disinfection practice must
calculate a disinfection benchmark, as subsections (d) and (e) describe, and
provide the benchmarks to the Agency. A supplier may only significantly change
its disinfection practice after receiving a SEP from the Agency approving the
change. A supplier must submit certain information to the Agency to gain
approval of a significant change:
1) A
description of the proposed change;
2) The disinfection profile for Giardia
lamblia (and, if necessary, viruses) and disinfection benchmark;
3) An analysis of how the proposed change
will affect the current levels of disinfection; and
4) Any additional information the Agency
requests.
d) Calculation
of a Disinfection Benchmark. A supplier significantly changing its disinfection
practice must calculate a disinfection benchmark using the specified procedure:
1) Step 1: Using the data that the supplier
collected to develop the disinfection profile, determine the average Giardia
lamblia inactivation for each calendar month by dividing the sum of all Giardia
lamblia inactivations for that month by the number of values calculated for
that month; and
2) Step 2:
Determine the lowest monthly average value out of the 12 values. This value
becomes the disinfection benchmark.
e) If a supplier uses chloramines, ozone, or
chlorine dioxide for primary disinfection the supplier must calculate the
disinfection benchmark from the data that the supplier collected for viruses to
develop the disinfection profile under subsection (d). The supplier must
calculate this viral benchmark in the same manner as calculating the Giardia
lamblia disinfection benchmark under subsection (d).
Notes
Amended at 28 Ill. Reg. 5269, effective March 10, 2004
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