Current through September 18, 2024
Authority: IC 13-13-5; IC 13-14-8; IC 13-14-9; IC 13-18-3; IC
13-18-16
Affected: IC 13-18-3-11
Sec. 11.
(a)
Following completion of the initial round of source water monitoring required
under
40 CFR
141.701(a), as incorporated
by reference in section 8(a)(1) of this rule, each filtered PWS shall calculate
an initial Cryptosporidium bin concentration for each plant for which
monitoring was required by:
(1) using the
Cryptosporidium results reported under
40 CFR
141.701(a), as incorporated
by reference in section 8(a)(1) of this rule; and
(2) following the procedures in subsection
(b).
(b) The following
calculations shall be used to determine bin concentrations for the PWS as
described:
(1) For a PWS that collects at
least forty-eight (48) samples, the bin concentration is equal to the
arithmetic mean of all sample concentrations.
(2) For a PWS that collects at least
twenty-four (24) samples, but not more than forty-seven (47) samples, the bin
concentration is equal to the highest arithmetic mean of all sample
concentrations in any twelve (12) consecutive months during which
Cryptosporidium samples were collected.
(3) For a PWS serving fewer than ten thousand
(10,000) people that monitors for Cryptosporidium for only one (1) year, the
bin concentration is equal to the arithmetic mean of all sample
concentrations.
(4) For a PWS that
has a plant that:
(A) operates only part of
the year; and
(B) monitors fewer
than twelve (12) months per year under
40 CFR
141.701(e), as incorporated
in section 8(a)(1) of this rule; the bin concentration is equal to the highest
arithmetic mean of all sample concentrations during any year of Cryptosporidium
monitoring.
(5) If the
monthly Cryptosporidium sampling frequency varies, a PWS shall:
(A) first calculate a monthly average for
each month of monitoring; and
(B)
then use the monthly average concentrations calculated under clause (A), rather
than individual sample concentrations, in the applicable calculation for bin
classification in subdivisions (1) through (4).
(c) A filtered system shall determine its
initial bin classification from the following table and using the
Cryptosporidium bin concentration calculated under subsections (a) and (b):
Table 11
| For systems that are: |
With a Cryptosporidium bin concentration
of:1
|
The bin classification is: |
| Required to monitor for Cryptosporidium
under
40 CFR
141.701, as incorporated by reference in
section 8(a)(1) of this rule. |
Cryptosporidium [LESS THAN] 0.075 oocysts/L |
Bin 1 |
| 0.075 oocysts/L [LESS THAN OR EQUAL TO]
Cryptosporidium [LESS THAN] 1.0 oocysts/L |
Bin 2 |
| 1.0 oocysts/L [LESS THAN OR EQUAL TO] Cryptosporidium
[LESS THAN] 3.0 oocysts/L |
Bin 3 |
| Cryptosporidium >= 3.0 oocysts/L |
Bin 4 |
| Serving fewer than 10,000 people and NOT required to
monitor for Cryptosporidium under
40 CFR
141.701(a)(4), as
incorporated by reference in section 8(a)(1) of this rule. |
NA |
Bin 1 |
1 Based on
calculations in subsection (a) or (d), as applicable.
(d) Following completion of the second round
of source water monitoring required under
40 CFR
141.701(b), as incorporated
by reference in section 8(a)(1) of this rule, a filtered PWS shall do the
following:
(1) Recalculate its Cryptosporidium
bin concentration using the Cryptosporidium results reported under
40 CFR
141.701(b), as incorporated
by reference in section 8(a)(1) of this rule and following the procedures in
subsection (b)(1) through (b)(4).
(2) Redetermine its bin classification using
the bin concentration calculated under subdivision (1) and Table 11 in
subsection (c).
(e) A
filtered PWS shall report its bin classifications as follows:
(1) A PWS shall report its initial bin
classification under subsection (c) to the commissioner for approval not later
than six (6) months after the PWS is required to complete initial source water
monitoring based on the schedule in
40 CFR
141.701(c), as incorporated
by reference in section 8(a)(1) of this rule.
(2) A PWS shall report its bin classification
under subsection (d) to the commissioner for approval not later than six (6)
months after the PWS is required to complete the second round of source water
monitoring based on the schedule in
40 CFR
141.701(c), as incorporated
by reference in section 8(a)(1) of this rule.
(3) The bin classification report to the
commissioner must include the following:
(A)
A summary of source water monitoring data.
(B) The calculation procedure used to
determine bin classification.
(f) Failure to comply with the conditions of
subsection (e):
(1) is a violation of the
treatment technique requirement; and
(2) requires public notification under 327
IAC 8-2.1.
