327 IAC 8-2.5-13 - Monitoring plan; 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. 13.
(a) The
following are PWS requirements for completion of a monitoring plan under
sections 11 and 12 of this rule, this section, and sections 14 through 20 of
this rule:
(1) A PWS shall develop and
implement a monitoring plan to be kept on file at the system for review by the
commissioner and the public. The monitoring plan must be completed not later
than the date initial monitoring is conducted under sections 11 and 12 of this
rule, this section, and sections 14 through 20 of this rule, and it must
contain the following elements:
(A)
Monitoring locations.
(B)
Monitoring dates.
(C) Compliance
calculation procedures.
(2) For selection of monitoring locations,
the following apply:
(A) If a PWS was not
required to submit an IDSE report under either
40 CFR
141.601, as incorporated by reference in
section 10(a)(2) of this rule, or
40 CFR
141.602, as incorporated by reference in
section 10(a)(3) of this rule, and the PWS does not have sufficient monitoring
locations as required under sections 4 through 9 of this rule to identify the
required number of compliance monitoring locations indicated in
40 CFR
141.605(b), as incorporated
by reference in section 10(a)(6) of this rule, the PWS shall do the following:
(i) Identify additional monitoring locations
by alternating selection of locations representing high TTHM levels and high
HAA5 levels until the required number of compliance monitoring locations have
been identified.
(ii) Provide the
rationale for identifying the locations, required under item (i), as having
high levels of TTHM or HAA5.
(B) If a PWS has more monitoring locations,
as required under sections 4 through 9 of this rule, than required for
compliance monitoring in
40 CFR
141.605(b), as incorporated
by reference in section 10(a)(6) of this rule, the PWS shall identify the
locations that will be used for compliance monitoring under sections 11 and 12
of this rule, this section, and sections 14 through 20 of this rule by
alternating selection of locations representing high TTHM levels and high HAA5
levels until the required number of samples under section 12 of this rule have
been identified.
(b) A Subpart H system serving greater than
three thousand three hundred (3,300) people shall submit a copy of the
monitoring plan to the commissioner prior to the date initial monitoring is
conducted under sections 11 and 12 of this rule, this section, and sections 14
through 20 of this rule, unless the initial distribution system evaluation
report submitted under section 10 of this rule contains all the information
required by this section.
(c)
Revision of a monitoring plan may be allowed if the following are met:
(1) A PWS may revise its monitoring plan
after consultation with the commissioner regarding the need for changes and the
appropriateness of changes to reflect one (1) or more of the following:
(A) Changes in treatment.
(B) Changes in distribution system operations
and layout (including new service areas).
(C) Other factors that can affect TTHM or
HAA5 formation.
(D) Reasons
approved by the commissioner.
(2) A PWS making changes to monitoring
locations shall replace existing compliance monitoring locations having the
lowest LRAA with new locations that reflect the current distribution system
locations with expected high TTHM or HAA5 levels.
(3) Modifications to a monitoring plan
required by the commissioner.
(4)
Subpart H systems serving greater than three thousand three hundred (3,300)
people shall submit a copy of the modified monitoring plan to the commissioner
prior to the date the PWS is required to comply with the revised monitoring
plan.
Notes
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