327 IAC 8-2.5-16 - Conditions requiring increased monitoring; stage 2 disinfection byproducts requirements
Authority: IC 13-13-5; IC 13-14-8-7; IC 13-14-9; IC 13-18-3-2; IC 13-18-16
Affected: IC 13-18-3-11
Sec. 16.
(a) A PWS
that is required to monitor at a particular location annually or less
frequently than annually under section 12 or 14 of this rule shall increase
monitoring to dual sample sets once per quarter (taken every ninety (90) days)
at all locations if one (1) or both of the following occur:
(1) TTHM sample is greater than
eighty-thousandths (0.080) milligrams per liter (mg/L).
(2) HAA5 sample is greater than
sixty-thousandths (0.060) mg/L at any location.
(b) A PWS is in violation of the following:
(1) MCL when the LRAA:
(A) exceeds the MCLs contained in section
2(b) of this rule, calculated based on four (4) consecutive quarters of
monitoring; or
(B) is calculated
based on fewer than four (4) quarters of data and the MCL would be exceeded
regardless of the monitoring results of subsequent quarters.
(2) Monitoring requirements for
each quarter that a monitoring result would be used in calculating an LRAA if
the PWS fails to monitor.
(c) A PWS may return to routine monitoring
once it has conducted increased monitoring for at least four (4) consecutive
quarters and the LRAA for every monitoring location meets the following:
(1) Less than or equal to sixty-thousandths
(0.060) mg/L for TTHM.
(2) Less
than or equal to forty-five thousandths (0.045) mg/L for HAA5.
Notes
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