Ga. Comp. R. & Regs. R. 391-3-5-.24 - Disinfectant Residuals, Disinfection Byproducts, and Disinfection Byproduct Precursors Sampling, Analytical and Other Requirements
(1)
Purpose. The purpose of this
Rule is to provide for the procedures for establishing maximum contaminant
levels, monitoring and other requirements for trihalomethanes, disinfectant
residuals, disinfection byproducts, and disinfection byproduct
precursors.
(2)
Variances. Variances from the maximum contaminant level for total
trihalomethanes shall be conducted in accordance with
40 CFR §
142.60.
(3)
Disinfectant Residuals,
Disinfection Byproducts, and Disinfection Byproduct Precursors.
(a) Community water systems and
non-transient, non-community water systems which add a chemical disinfectant to
the water in any part of the drinking water treatment process must modify their
practices to meet MCLs and MRDLs specified in subparagraph (7)(a) of Rule
391-3-5-.18, and must meet the
treatment technique requirements for disinfection byproduct precursors
specified in paragraph (10).
(b)
Transient non-community water systems that use chlorine dioxide as a
disinfectant or oxidant must modify their practices to meet the MRDL for
chlorine dioxide specified in subparagraph (7)(a) of Rule
391-3-5-.18.
(c) Community Subpart H water systems and
non-transient, non-community Subpart H water systems must comply with the
requirements of this Rule, as specified in paragraphs (7)(b) and (7)(c) of Rule
391-3-5-.18, respectively.
(d) Beginning January 1, 2002, transient
non-community Subpart H water systems serving 10,000 or more persons and using
chlorine dioxide as a disinfectant or oxidant must comply with the requirements
for chlorine dioxide and chlorite in this Rule.
(e) Beginning January 1, 2004, transient
non-community Subpart H water systems serving fewer than 10,000 people and
using chlorine dioxide as a disinfectant or oxidant and systems using only
ground water not under the direct influence of surface water and using chlorine
dioxide as a disinfectant or oxidant must comply with the requirements for
chlorine dioxide and chlorite in this Rule.
(f) Systems may increase residual
disinfectant levels in the distribution system of chlorine or chloramines (but
not chlorine dioxide) to a level and for a time necessary to protect public
health, to address specific microbiological contamination problems caused by
circumstances such as, but not limited to, distribution line breaks, storm
run-off events, source water contamination events, or cross-connection
events.
(g) Systems must use the
analytical method(s) specified in
40 CFR §
141.131 to demonstrate compliance with the
requirements of this Rule. The analytical requirements specified in
40 CFR §
141.131, which is hereby incorporated by
reference, are required to demonstrate compliance with the requirements of
Subpart L (Disinfectant Residuals, Disinfection ByProducts, and Disinfection
ByProduct Precursors), Subpart U (Initial Distribution System Evaluations), and
Subpart V (Stage 2 Disinfection ByProducts Requirements) of 40 CFR Part 141
.
(h) Monitoring Requirements.
40 CFR §
141.132, in its entirety, is hereby
incorporated by reference. For compliance with the requirements of this Rule,
the water systems must monitor the applicable parameters included in this Rule
at the frequency specified in
40 CFR §
141.132. Failure to monitor will be treated
as a violation for the entire period covered by the annual average where
compliance is based on a running annual average of monthly or quarterly samples
or averages and the system's failure to monitor makes it impossible to
determine compliance with MCLs or MRDLs.
1.
Systems must take all samples during normal operating conditions.
2. Systems may consider multiple wells
drawing water from a single aquifer as one treatment plant for determining the
minimum number of TTHM and HAA5 samples required, with the Division
approval.
3. Systems may use only
data collected under the provisions of this Rule to qualify for reduced
monitoring.
4. Each system required
to monitor under this Rule must develop and implement a monitoring plan. The
plan must include at least the following elements: specific locations and
schedules for collecting samples for any parameters included in this Rule; how
the system will calculate compliance with MCLs, MRDLs, and treatment
techniques; and if approved for monitoring as a consecutive system, or if
providing water to a consecutive system, the sampling plan must reflect the
entire distribution system.
(i) The system
must maintain the plan and make it available for inspection by the Division and
the general public no later than thirty (30) days following applicable
compliance dates stated in paragraph (3)(c).
(ii) All Subpart H systems serving more than
3,300 people must submit a copy of the monitoring plan to the Division no later
than the date of the first report required under
40 CFR §
141.134.
(iii) The Division may require a monitoring
plan to be submitted by any other system. The Division may also require changes
in any plan elements.
(4)
Monitoring and Compliance for
Disinfection Byproducts. Monitoring for disinfection byproducts shall be
conducted as specified in 40
CFR §
141.132(b).
Compliance with the disinfection byproducts requirements shall be determined in
accordance with 40 CFR
§
141.133(b).
(5)
Monitoring and Compliance for
Disinfectant Residuals.
(a) Monitoring
for disinfectant residuals shall be conducted as specified in
40 CFR §
141.132(c). Compliance with
the disinfectant residuals requirements shall be determined in accordance with
40 CFR §
141.133(c).
(b)
Routine monitoring.
Until March 31, 2016, community and non-transient non-community water systems
that use chlorine or chloramines must measure the residual disinfectant level
in the distribution system at the same point in the distribution system and at
the same time as total coliforms are sampled, as specified in
40 CFR §
141.21. Beginning April 1, 2016, community
and non-transient non-community water systems that use chlorine or chloramines
must measure the residual disinfectant level in the distribution system at the
same point in the distribution system and at the same time as total coliforms
are sampled, as specified in Rule
391-3-5-.55(4) through
(8). 40 CFR Part 141 Subpart H systems may
use the results of residual disinfectant concentration sampling conducted under
40 CFR §
141.74(c)(3)(i) for systems
which filter, in lieu of taking separate samples.
(6)
Monitoring and Compliance for
Disinfection Byproduct Precursors. Monitoring for disinfection byproduct
precursors shall be conducted as specified in
40 CFR §
141.132(d). Compliance with
the disinfection byproduct precursors requirements shall be determined in
accordance with 40 CFR
§
141.133(c) and as
specified by 40 CFR §
141.135(b).
(7)
Non-Compliance in First Monitoring
Year. If, during the first year of monitoring under
40 CFR §
141.132, any individual quarter's average
will cause the running annual average of that system to exceed the MCL, the
system shall be considered out of compliance at the end of that
quarter.
(8)
Samples for
Compliance Determination. All samples taken and analyzed under the
provisions of this Rule must be included in determining compliance, even if
that number is greater than the minimum required. Compliance requirements
specified in 40 CFR Part
141, Subpart L §
141.133 is hereby
incorporated by reference.
(9)
Treatment Techniques. Treatment techniques for control of
disinfection byproduct precursors requirements specified in
40 CFRPart 141, Subpart L
§
141.135 is hereby incorporated by
reference.
(a) Subpart H systems using
conventional filtration treatment (as defined in § 141.2) must operate
with enhanced coagulation or enhanced softening to achieve the TOC percent
removal levels specified in 40 CFR §
141.135(b) unless the system
meets at least one of the alternative compliance criteria specified in
40 CFR §§
141.135(a)(2) or
(a)(3).
(b) Alternative compliance criteria for
enhanced coagulation and enhanced softening systems:
40 CFR Part 141, Subpart L
§
141.135(a)(2) is
hereby incorporated by reference.
(c) Additional alternative compliance
criteria for softening systems:
40 CFR Part 141, Subpart L,
§
141.135(a)(3) is
hereby incorporated by reference.
(d) Enhanced coagulation and enhanced
softening performance requirements:
40 CFR Part 141, Subpart L
§
141.135(b) is hereby
incorporated by reference.
(e)
Compliance calculations: 40
CFR Part 141, Subpart L §
141.135(c) is hereby
incorporated by reference.
(f)
Treatment technique requirements for disinfection byproduct precursors:
40 CFR Part 141, Subpart L
§
141.135(d) is hereby
incorporated by reference.
(g)
Required additional health information:
40 CFR §
141.154 is hereby incorporated by
reference.
Notes
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