Ohio Admin. Code 3745-81-24 - Organic chemical monitoring requirements
Monitoring requirements for organic chemical contaminants of
drinking water are stated in this rule. Analytical procedures which are
acceptable for monitoring for organic contaminants in drinking water are listed
in rule 3745-81-27 of the Administrative
Code. Analyses under this rule shall only be conducted by laboratories that are
certified for these analyses under Chapter 3745-89 of the Administrative Code.
Community public water systems and nontransient noncommunity public water
systems shall
(A) Monitoring for
volatile organic chemicals with maximum contaminant levels (MCLs) listed in
paragraph (D)
(C) of rule
3745-81-12 of the Administrative
Code shall be conducted by community public water systems and nontransient
noncommunity public water systems as follows:
(1) Groundwater systems shall monitor with a
minimum of one sample at each respective sampling point during each compliance
period . Surface water systems shall monitor with a minimum of one sample
annually at each sampling point . After the first set of samples, each repeat
sample shall be taken at the same sampling point as used before unless
conditions make another sampling point more representative of a source ,
treatment plant, or part of the distribution system.
(2) If a public water system draws water from
more than one source and the sources are combined before distribution, the
public water system shall monitor at each sampling point during periods of
normal operating conditions and shall keep a record of and report the sources
providing water for each sample. When a sample does not contain water from all
the sources which serve the sampling point , the public water system shall
prepare and follow a schedule such that the next monitoring sample at this
sampling point for the same volatile organic chemicals will include water from
sources not included in the previous sample or samples. Thus, successive
samples from the same sampling point for the same volatile organic chemicals
shall sample water supplied from different sources until all the sources
supplying that sampling point have been monitored.
(3) Each
new community and new nontransient noncommunity public water system and public
water systems that use a new source of water shall monitor initially with four
consecutive quarterly samples for each contaminant listed in paragraph
(D)
(C) of
rule 3745-81-12 of the Administrative
Code beginning in the first quarter of the next calendar year after operation
of the new source of system begins. New public water systems shall sample at
each sampling point ; systems with a new source of water shall sample at the
sampling point related to the new source .
(4) If the initial monitoring for the
contaminants listed in paragraph (D)
(C) of rule
3745-81-12 of the Administrative
Code has been completed and the public water system did not detect any
contaminant listed in paragraph (D)
(C) of rule
3745-81-12 of the Administrative
Code, then the public water system shall monitor with one sample annually. For
any contaminant detected during the initial monitoring, the public water system
shall continue quarterly monitoring until eligible for a reduction under
paragraph (A)(6)(b) of this rule.
(5) The director may, after a minimum of
three years of annual monitoring with no detection of any contaminant listed in
paragraph (D)
(C) of rule
3745-81-12 of the Administrative
Code, reduce monitoring by a groundwater system to one sample during each
compliance period .
(6) If a
contaminant listed in paragraph (D)
(C) of rule
3745-81-12 of the Administrative
Code is detected at a level exceeding 0.0005 milligram per liter in any sample,
then:
(a) The public water system shall
monitor quarterly at each sampling point which resulted in a detection. If a
public water system is monitoring annually or less frequently for a previously
detected contaminant , then the public water system does not have to return to
quarterly monitoring for that contaminant unless the sample result exceeds
eighty per cent of the MCL .
(b) The
director may decrease the quarterly monitoring requirement specified in
paragraph (A)(6)(a) of this rule to annual monitoring provided the director has
determined that the public water system does not exceed eighty per cent of the
MCL for that contaminant . In no case shall the director make this determination
unless a groundwater system has monitored with a minimum of two consecutive
quarterly samples and a surface water system has monitored with a minimum of
four consecutive quarterly samples.
(c) Public water systems which monitor
annually for a previously detected contaminant shall monitor during the
quarter(s)
quarters which previously yielded the highest
analytical result.
(7)
The director may require a confirmation sample for positive or negative
results. If a confirmation sample is required by the director , the result shall
be averaged with the first sampling result and the average used for the
compliance determination as specified by paragraph (A)(8) of this
rule.
(8) Compliance with paragraph
(D)
(C) of
rule 3745-81-12 of the Administrative
Code shall be determined based on the analytical results obtained at each
sampling point .
(a) For public water systems
which are conducting monitoring at a frequency greater than annually,
compliance is determined by a running annual average of all samples taken at
each sampling point . If the running annual average of any sampling point is
greater than the MCL , then the public water system is out of compliance. The
system will not be considered in violation of the MCL until it has completed
one year of quarterly sampling. If, however, the initial sample or a subsequent
sample would cause the running annual average to exceed the MCL , then the
public water system is out of compliance immediately. Any samples below the
detection limit shall be counted as zero for purposes of determining the
running annual average.
(b) For
public water systems monitoring annually or less frequently, when the average
of a result and a required confirmation sample exceeds eighty per cent of the
MCL , the public water system shall begin quarterly monitoring at that sample
point. If a confirmation sample was not collected, the public water system
shall begin quarterly monitoring if the level of the initial sample exceeds
eighty per cent of the MCL . Compliance with a MCL will be determined by a
running annual average as stated in paragraph (A)(8)(a) of this rule. If one
sampling point is in violation of the MCL , the system is in violation of the
MCL .
(c) If a public water system
fails to collect the required number of samples, compliance will be based on
the total number of samples collected.
(9) Analysis for the contaminants listed in
paragraph (D)
(C) of rule
3745-81-12 of the Administrative
Code shall be conducted using the methods in rule
3745-81-27 of the Administrative
Code.
(10) Analysis under this rule shall only be
conducted by laboratories that are approved under Chapter 3745-89 of the
Administrative Code.
(11) The
director has discretion to delete results of obvious sampling or analytical
errors.
(12) The director may
increase required monitoring where necessary to detect variations within the
public water system .
(13) Each
approved laboratory shall determine the method detection limit (MDL ), as
defined in the appendix to rule
3745-89-03 of the Administrative
Code, at which it is capable of detecting volatile organic chemicals . The
acceptable MDL is 0.0005 milligram per liter. This concentration is the
detection concentration for purposes of this rule.
(B) Monitoring of the organic chemical
contaminants with maximum contaminant levels listed in paragraph
(E)
(D) of
rule 3745-81-12 of the Administrative
Code shall be conducted by community public water systems and nontransient
noncommunity public water systems as described
below.
follows:
(1) Groundwater systems and surface water
systems shall monitor with a minimum of one sample at each sampling point each
time monitoring is required in paragraph (B) of this rule. After the initial
set of samples, each sample shall be taken at the same sampling point as used
before unless conditions make another sampling point more representative of a
source or treatment plant.
(2) If
the public water system draws water from more than one source and the sources
are combined before distribution, the public water system shall monitor at each
sampling point during periods of normal operating conditions and shall keep a
record of and report the sources providing water for each sample. When a sample
does not contain water from all the sources which serve the sampling point , a
schedule prepared by the public water system shall be followed so that the next
monitoring sample at this sampling point for the same organic
chemical(s)
chemicals will include water from sources not included
in the previous sample or samples. Thus, successive samples from the same
sampling point for the same organic chemical(s)
chemicals
shall sample water supplied from different sources until all the sources
supplying that sampling point have been monitored.
(3) Monitoring frequency:
(a) Each community public water system and
nontransient noncommunity public water system shall monitor with four
consecutive quarterly samples at each sampling point for each organic chemical
contaminant listed in paragraph (E)
(D) of rule
3745-81-12 of the Administrative
Code during each compliance period .
(b) Public water systems serving more than
three thousand three hundred persons which do not detect a contaminant listed
in paragraph (E)
(D)
of rule
3745-81-12 of the Administrative
Code in their first compliance period may reduce the sampling frequency to a
minimum of two quarterly samples in one year during each following compliance
period .
(c) Public water systems
serving fewer than three thousand three hundred one persons which do not detect
a contaminant listed in paragraph (E)
(D) of rule
3745-81-12 of the Administrative
Code in their first compliance period may reduce the sampling frequency to a
minimum of one sample during each following compliance period .
(d) Public water systems that use a new
source of water and new public water systems shall begin initial quarterly
monitoring for each contaminant listed in paragraph (E)
(D) of rule
3745-81-12 of the Administrative
Code in a quarter designated by the director during the next calendar year
after operation of the new source or system begins. New public water systems
shall sample at each sampling point . Public water systems with a new source of
water shall sample at the sampling point related to the new source .
(4) The director may grant a
waiver from one or more requirements of paragraphs (B)(3)(a) to (B)(3)(c) of
this rule. Each waiver is valid for only one compliance period .
(5) The director may grant a waiver after
evaluating the previous use (including transport, storage, or disposal) of a
contaminant listed in paragraph (E)
(D) of rule
3745-81-12 of the Administrative
Code within the watershed or zone of influence of the public water system . If a
determination by the director reveals no previous use of the contaminant within
the watershed or zone of influence, a waiver may be granted. If the contaminant
has been used previously or if its
the previous use is unknown, then the following
factors shall be used to determine whether a waiver is granted.
:
(a) Previous analytical results.
(b) The proximity of the public water system
to a potential point or nonpoint source of contamination. Point sources include
spills and leaks of chemicals at or near a water treatment facility or at
manufacturing, distribution, or storage facilities or from hazardous and
municipal waste landfills and other waste handling or treatment facilities.
Nonpoint sources include the use of pesticides to control insect and weed pests
on agricultural areas, forest lands, homes and gardens, and other land
application uses.
(c) The
environmental persistence and transport of the organic chemicals listed in
paragraph (E)
(D) of rule
3745-81-12 of the Administrative
Code.
(d) How completely the water
source is protected against contamination due to such factors as the depth of
the well, the type of soil, and the integrity of the well casing.
(e) Elevated nitrate levels at the public
water system source .
(f) Use of
polychlorinated biphenyls in equipment used in the production, storage, or
distribution of water (e.g., polychlorinated biphenyls used in pumps,
transformers, etc.).
(6)
If an organic chemical contaminant listed in paragraph
(E)
(D) of
rule 3745-81-12 of the Administrative
Code is detected (as defined by paragraph (B)(14) of this rule) in any sample,
then:
(a) Each public water system shall
monitor quarterly at each sampling point which resulted in a detection. If a
public water system is monitoring annually or less frequently for a previously
detected contaminant , then the public water system does not have to return to
quarterly monitoring unless the sample result exceeds eighty per cent of the
MCL .
(b) The director may decrease
the quarterly monitoring requirement specified in paragraph (B)(6)(a) of this
rule to annual monitoring provided the director has determined that the public
water system does not exceed eighty per cent of the MCL . In no case shall the
director make this determination unless a groundwater system takes a minimum of
two quarterly samples and a surface water system takes a minimum of four
quarterly samples.
(c) Public water
systems which monitor annually shall monitor during the quarter that previously
yielded the highest analytical result.
(d) For public water systems which have three
consecutive annual samples with no detection of a contaminant listed in
paragraph (E)
(D) of rule
3745-81-12 of the Administrative
Code, the director may grant a waiver as specified in paragraph (B)(4) of this
rule.
(e) If monitoring results in
detection of one or more of certain related contaminants (heptachlor,
heptachlor epoxide), then subsequent monitoring shall analyze for all related
contaminants.
(7) The
director may require a confirmation sample for positive or negative results. If
a confirmation sample is required by the director , the result shall be averaged
with the first monitoring result and the average used for the compliance
determination as specified by paragraph (B)(8) of this rule.
(8) Compliance with paragraph
(E)
(D) of
rule 3745-81-12 of the Administrative
Code shall be determined based on the analytical results obtained at each
sampling point
.
, as
follows:
(a) For public water systems
which are conducting monitoring at a frequency greater than annual, compliance
is determined by a running annual average of all samples taken at each sampling
point . The system will not be considered in violation of the MCL until it has
completed one year of quarterly monitoring. If, however, the initial result or
a subsequent result would cause the running annual average to exceed the MCL ,
then the public water system is out of compliance immediately. If a system
fails to collect the required number of samples, compliance will be based on
the total number of samples collected. If one sampling point is in violation of
the MCL , the system is in violation of the MCL . Any results below the detection
limit shall be calculated as zero for purposes of determining the running
annual average.
(b) For public
water systems monitoring annually or less frequently, when the average of a
result and a confirmation sample exceeds eighty per cent of the MCL the public
water system shall begin quarterly monitoring at that sample point. If a
confirmation sample was not collected, the public water system shall begin
quarterly monitoring if the level of the initial sample exceeds eighty percent
of the MCL . Compliance with the MCL will then be determined by a running annual
average as stated in paragraph (B)(8) (a) of this rule.
(9) Analysis for the organic chemical
contaminants listed in paragraph (E)
(D) of rule
3745-81-12 of the Administrative
Code shall be conducted by using methods set forth in rule
3745-81-27 of the Administrative
Code.
(10) Analysis for
polychlorinated biphenyls shall be conducted as follows:
(a) Each public water system which monitors
for polychlorinated biphenyls shall analyze or have analyzed each sample using
a technique set forth in rule
3745-81-27 of the Administrative
Code.
(b) If polychlorinated
biphenyls (as one of seven aroclors) are detected (as designated in this
paragraph) in any sample analyzed using a technique set forth in rule
3745-81-27 of the Administrative
Code, the sample shall be reanalyzed using a technique set forth in rule
3745-81-27 of the Administrative
Code to quantitate polychlorinated biphenyls (as decachlorobiphenyl).
(c) Compliance with the MCL for
polychlorinated biphenyls shall be determined based upon the quantitative
results of analyses using a technique set forth in rule
3745-81-27 of the Administrative
Code.
|
Aroclor |
Detection limit (Milligrams per liter) |
|
1016 |
0.00008 |
|
1221 |
0.02 |
|
1232 |
0.0005 |
|
1242 |
0.0003 |
|
1248 |
0.0001 |
|
1254 |
0.0001 |
|
1260 |
0.0002 |
(11) The director has discretion to delete
results of obvious sampling or analytical errors.
(12) The director may increase the required
monitoring frequency, where necessary, to detect variations within the public
water system (e.g., fluctuations in concentration due to seasonal use, changes
in water source ).
(13) Each public
water system shall monitor at the time designated by the director within each
compliance period .
(14) Detection
as used in this rule shall be defined as greater than or equal to the following
concentration for each contaminant .
|
|
Detection limit (Milligrams per liter) |
|
Alachlor |
0.0002 |
|
Atrazine |
0.0001 |
|
Benzo(A)pyrene |
0.00002 |
|
Carbofuran |
0.0009 |
|
Chlordane |
0.0002 |
|
Dalapon |
0.001 |
|
1,2-Dibromo-3-chloropropane (DBCP) |
0.00002 |
|
Di(2-ethylhexyl) adipate |
0.0006 |
|
Di(2-ethylhexyl) phthalate |
0.0006 |
|
Dinoseb |
0.0002 |
|
Diquat |
0.0004 |
|
2,4-d |
0.0001 |
|
Endothall |
0.009 |
|
Endrin |
0.00001 |
|
Ethylene dibromide (EDB) |
0.00001 |
|
Glyphosate |
0.006 |
|
Heptachlor |
0.00004 |
|
Heptachlor epoxide |
0.00002 |
|
Hexachlorobenzene |
0.0001 |
|
Hexachlorocyclopentadiene |
0.0001 |
|
Lindane |
0.00002 |
|
Methoxychlor |
0.0001 |
|
Oxamyl |
0.002 |
|
Pentachlorophenol |
0.00004 |
|
Picloram |
0.0001 |
|
Pentachlorophenol |
0.00004 |
|
Polychlorinated biphenyls (PCBs) (As decachlorobiphenyl) |
0.0001 |
|
Simazine |
0.00007 |
|
Toxaphene |
0.001 |
|
2,3,7,8-TCDD (dioxin) |
0.000000005 |
|
2,4,5-TP (silvex) |
0.0002 |
(C) Monitoring for total trihalomethanes
(TTHM ) and haloacetic acids five (HAA5 ).
(1)
Community public water systems and nontransient noncommunity public water
systems that treat their water with any combination of primary or residual
disinfectant , other than ultraviolet light, or delivers water that has been
treated with any combination of primary or residual disinfectant , other than
ultraviolet light, shall monitor for TTHM and HAA5 according to paragraph (C)
of this rule. The director will determine compliance with MCLs for TTHMs and
HAA5 .
(2) For public water systems
required to conduct quarterly monitoring, compliance with MCLs for TTHMs and
HAA5 shall be based on a locational running annual arithmetic average at each
monitoring location, calculated quarterly, at the end of the fourth calendar
quarter following the compliance date and at the end of each subsequent quarter
(or earlier if the LRAA calculated based on fewer than four quarters of data
would cause the MCL to be exceeded regardless of the monitoring results of
subsequent quarters). For public water systems monitoring quarterly, if the
system fails to complete four consecutive quarters of monitoring, compliance
with the MCL for the last four quarter compliance period
must
shall be
based on the average of the available data from the most recent four
quarters.
(3) If the public water
system is required to conduct monitoring at a frequency that is less than
quarterly, compliance with MCLs shall be based on the LRAA calculations
beginning with the first compliance sample taken after the compliance date. If
any sample result exceeds the MCL , the public water system
must
shall
comply with the requirements of paragraphs (C)(18) to (C)(20) of this rule. If
no sample exceeds the MCL , the sample result for each monitoring location is
considered the LRAA for that monitoring location.
(4) If a public water system takes more than
one sample per quarter at a monitoring location, the average of all samples
taken in the quarter at that location must
shall be used to
determine a quarterly average to be used in the LRAA calculation.
(5) If the public water system fails to
monitor according to the sample monitoring plan, the system will be in
violation for the entire period covered by the locational running annual
average . Public water systems shall take all samples during normal operating
conditions .
(6) Routine monitoring
for TTHMs and HAA5 : Public water systems are required to begin monitoring at
the locations and the time period identified in the sample monitoring plan
developed under paragraph (C)(9) of this rule. Public water systems specified
in paragraph (C)(1) of this rule shall monitor at the frequency indicated and
at no fewer than the number of locations identified in the following table:
|
|
Population size category |
Monitoring frequency1 |
Sample Type2 |
Distribution system monitoring location total per monitoring period2 |
|
|
<500 |
Per year |
Individual samples |
2 |
|
500-3,300 |
Every 90 days |
Individual samples |
2 |
|
|
|
3,301-9,999 |
Every 90 days |
|
2 |
|
10,000-49,999 |
Every 90 days |
|
4 |
|
|
|
50,000- 249,999 |
Every 90 days |
|
8 |
|
250,000-999,999 |
Every 90 days |
|
12 |
|
|
|
1,000,000-4,999,999 |
Every 90 days |
|
16 |
|
> or = 5,000,000 |
Every 90 days |
|
20 |
|
|
|
<500 |
Per year |
Individual samples |
2 |
|
500-9,999 |
Per year |
|
2 |
|
|
|
10,000-99,999 |
Every 90 days |
|
4 |
|
100,000-499,999 |
Every 90 days |
|
6 |
|
|
|
> or = 5,000,000 |
Every 90 days |
|
8 |
|
1 All systems
|
||||
|
2 Systems on quarterly
monitoring |
||||
(7)
Systems on quarterly monitoring are required to monitor every ninety days. The
ninety day monitoring frequency may be extended or reduced by five days to
allow for unplanned circumstances that prevent monitoring precisely ninety days
apart, as long as the samples are collected during each calendar
quarter.
(8) If a system that does
not disinfect begins using a disinfectant other than UV light, the system
must
shall
consult with the director to identify compliance monitoring locations and
develop a monitoring plan under paragraph (C)(9) of this rule that includes
those monitoring locations.
(9)
Each public water system required to monitor for TTHM and HAA5 shall develop
and implement a sample monitoring plan. The public water system shall maintain
the plan and make it available for inspection by the director and the general
public. The monitoring plan must
shall contain the following elements: monitoring
locations (including both a location address and sample monitoring point code);
monitoring dates; and alternate monitoring locations (in the event access to a
primary location is not available). The director will determine compliance with
MCLs for TTHMs and HAA5 .
(10)
Monitoring locations must
shall be chosen by alternating selection of locations
representing high TTHM levels and high HAA5 levels until the required number of
compliance monitoring locations have been identified. Public water systems
must
shall
also provide the rationale for identifying the locations as having high levels
of TTHM or HAA5 . If a public water system has more monitoring locations than
required for compliance monitoring according to paragraph (C) of this rule,
systems must
shall identify which locations will be used for
compliance monitoring by alternating selection of locations representing high
TTHM levels and high HAA5 levels until the required number of compliance
monitoring locations have been identified.
(11) All surface water systems
must
shall
submit a copy of the monitoring plan to the director . The director may require
new community and non-transient noncommunity water systems that treat their
water with any combination of primary or residual disinfectant , other than
ultraviolet light, or deliver water that has been treated with any combination
of primary or residual disinfectant , other than ultraviolet light to develop
and submit a sample monitoring plan within twelve months of becoming
active.
(12) A public water system
may revise the monitoring plan to reflect changes in treatment, distribution
system operations and layout (including new service areas), or other factors
that may affect TTHM or HAA5 formation, or for director approved reasons, after
consultation with the director regarding the need for changes and the
appropriateness of changes. If a system changes monitoring locations, the
locations must
shall replace existing compliance monitoring locations
with the lowest LRAA with new locations that reflect the current distribution
system locations with expected high TTHM or HAA5 levels. The director may also
require modifications in the monitoring plan. Surface water systems
must
shall
submit a copy of the modified monitoring plan to the director prior to the date
required to comply with the revised monitoring plan.
(13) Reduced monitoring for TTHMs and HAA5 :
Public water systems may reduce monitoring to the level specified in the
following table any time the LRAA is less than or equal to 0.040 mg/L for TTHM
and less than or equal to 0.030 mg/ L for HAA5 at all monitoring locations.
Systems may only use data collected under the provisions of paragraph (C) of
this rule to qualify for reduced monitoring. In addition, the source water
annual average TOC level, before any treatment, must
shall be less
than or equal to 4.0 mg/L at each treatment plant treating surface water , based
on monitoring conducted under rule
3745-81-77 of the Administrative
Code.
|
|
Population size category |
Monitoring frequency |
Distribution system monitoring location total per monitoring period |
|
|
<500 |
NA |
Monitoring may not be reduced |
|
500-3,300 |
Per year |
1 |
|
|
|
3,301-9,999 |
Per year |
2 dual sample sets: one at the location and during the
quarter with the highest |
|
10,000-49,999 |
Every 90 days |
2 dual sample sets at the locations with the highest
|
|
|
|
50,000-249,999 |
Every 90 days |
4 dual sample sets-at the locations with the two
highest |
|
250,000-999,999 |
Every 90 days |
6 dual sample sets-at the locations with the three
highest |
|
|
|
1,000,000-4,999,999 |
Every 90 days |
8 dual sample sets-at the locations with the four
highest |
|
> or = 5,000,000 |
Every 90 days |
10 dual sample sets-at the locations with the five
highest |
|
|
|
<500 |
Every third year |
1 |
|
500-9,999 |
Per year |
1 |
|
|
|
10,000-99,999 |
Per year |
2 dual sample sets: one at the location and during the
quarter with the highest |
|
100,000-499,999 |
Every 90 days |
2 dual sample sets; at the locations with the highest
|
|
|
|
> or = 5,000,000 |
Every 90 days |
4 dual sample sets at the locations with the two
highest |
|
1 Systems on quarterly
monitoring |
|||
(14)
Public water systems may remain on reduced monitoring as long as the TTHM LRAA
is less than or equal to 0.040 mg/L and the HAA5 LRAA is less than or equal to
0.030 mg/L at each monitoring location (for systems with quarterly reduced
monitoring) or each TTHM sample is less than or equal to 0.060 mg/L and each
HAA5 sample is less than or equal to 0.045 mg/L (for systems with annual or
less frequent monitoring). In addition, the source water annual average TOC
level, before any treatment, must
shall be less than or equal to 4.0 mg/L at each
treatment plant treating surface water , based on monitoring conducted under
rule 3745-81-77 of the Administrative
Code.
(15) If the LRAA based on
quarterly monitoring at any monitoring location exceeds either 0.040 mg/L for
TTHM or 0.030 mg/L for HAA5 or if the annual (or less frequent) sample at any
location exceeds either 0.060 mg/L for TTHM or 0.045 mg/L for HAA5 , or if the
source water annual average TOC level, before any treatment, greater than 4.0
mg/L at any treatment plant treating surface water , the system
must
shall
resume routine monitoring under paragraph (C)(6) of this rule or begin
increased monitoring if paragraph (C)(18) of this rule applies.
(16) The director may return a public water
system to routine monitoring at the director 's discretion, for reasons
including but not limited to: treatment change, significant distribution
changes, or disinfectant changes.
(17) Consecutive systems that do not add a
disinfectant but deliver water that has been treated with a primary or residual
disinfectant other than ultraviolet light, must
shall comply with
analytical, monitoring, and compliance requirements for chlorine and
chloramines in rules
3745-81-27 and
3745-81-70 of the Administrative
Code and report monitoring results under paragraph (G)(4) of rule
3745-81-75 of the Administrative
Code.
(18) If a public water system
is required to monitor at a particular location annually or less frequently
than annually under paragraph (C)(6) or (C)(13) of this rule, the system
must
shall
increase monitoring to dual sample sets once per quarter (taken every ninety
days) at all locations if a TTHM sample is greater than 0.080 mg/L or a HAA5
sample is greater than 0.060 mg/L at any location.
(19) A public water system is in violation of
the MCL when the LRAA exceeds the MCLs in rule
3745-81-12 of the Administrative
Code, calculated based on four consecutive quarters of monitoring (or the LRAA
calculated based on fewer than four quarters of data if the system fails to
complete four consecutive quarters of monitoring, or if the MCL would be
exceeded regardless of the monitoring results of subsequent quarters). The
system is in violation of the monitoring requirements for each quarter that a
monitoring result would be used in calculating an LRAA if the system fails to
monitor .
(20) Public water systems
may return to routine monitoring once increased monitoring has been conducted
for at least four consecutive quarters and the LRAA for every monitoring
location is less than or equal to 0.060 mg/L for TTHM and less than or equal to
0.045 mg/L for HAA5 .
(21)
Operational evaluation levels: A public water system has exceeded the
operational evaluation level at any monitoring location where the sum of the
two previous quarters' TTHM results plus twice the current quarter's TTHM
result, divided by four to determine an average, exceeds 0.080 mg/L, or where
the sum of the two previous quarters' HAA5 results plus twice the current
quarter's HAA5 result, divided by four to determine an average, exceeds 0.060
mg/L.
(a) If a public water system exceeds
the operational evaluation level, the system must
shall conduct an
operational evaluation and submit a written report of the evaluation to the
director no later than ninety days after being notified by the director of the
analytical result that causes the system to exceed the operational evaluation
level. The written report must
shall be made available to the public upon
request.
(b) The public water
system's
system's operational evaluation
must
shall
include an examination of system treatment and distribution operational
practices, including storage tank operations, excess storage capacity,
distribution system flushing, changes in sources or source water quality, and
treatment changes or problems that may contribute to TTHM and HAA5 formation
and what steps could be considered
actions the PWS will take and when these actions will be
implemented to minimize future exceedences
exceedances. If
the system exceeding the OEL is a consecutive water system , a master meter
monitoring location shall be submitted to the director for approval at each
master meter, or as close as possible, supplying water to each monitoring
location that exceeds the OEL .
(c) A public water system may request and the
director may allow the system to limit the scope of the evaluation if the
system is able to identify the cause of the operational evaluation level
exceedance.
(d) A request from the
system to limit the scope of the evaluation does not extend the schedule in
paragraph (C)(21)(a) of this rule for submitting the written report. The
director must
shall approve this limited scope of evaluation in
writing and the system must
shall keep that
approval with the completed report.
(22)
If a consecutive
water system exceeds the operational evaluation level or the TTHM LRAA or HAA5
LRAA is in exceedance of the MCL for two quarters within a twelve month period
and the current individual compliance monitoring period's results are greater
than the TTHM or HAA5 MCL , the following apply:
(a)
Beginning the
quarter following the second OEL or MCL exceedance, the consecutive water
system shall monitor quarterly for disinfection byproducts at the mater meter
monitoring locations acceptable to the director . The master meter monitoring
shall be conducted with routine TTHM and HAA5 compliance monitoring. The mater
meter monitoring shall be conducted for a miniumum of four consecutive quaters
unless otherwise specified by the director .
(b)
If any master
meter monitoring results collected by the consecutive water system pursuant to
paragraph (C)(22)(a) of this rule are greater than the TTHM or HAA5 MCL ,
beginning the next calendar quarter the wholesale system delivering water to
the consecutive water system shall begin quarterly monitoring at or near the
respective master meter monitoring locations for a minimum of four consecutive
quarters unless otherwise specified by the director . The wholesaler's master
meter monitoring locations shall be submitted to the director for approval. The
wholesaler shall conduct monitoring at the master meter monitoring locations
concurrently with the consecutive water system in accordance with a schedule
determined by the director . If a master meter location is the same location for
both the consecutive and wholesale system , and the wholesale system and
consecutive system agree to sample from this master meter location to comply
with this rule, both systems may jointly request that the Director approve the
agreed upon master meter location.
(c)
If the
consecutive waster system or wholesale system has a sample result at any master
meter monitoring location greater than the TTHM or HAA5 MCL , after the first
quarter of wholesaler monitoring, an OEL resport shall be completed by the
consecutive water system and the wholesale system .The OEL reports shall be
completed and submitted to the director in accordance with paragraph (C)(21) of
this rule on a form accpetable to the director . An OEL report shall be
completed and submitted for each quarter when the individual quarterly sample
result at the master meter monitoring locations is greater than the TTHM or
HAA5 MCL .
(d)
Master meter monitoring locations determined to have an
LRAA that exceeds either the TTHM or HAA5 MCL shall become additional
compliance monitoing locations for the wholesale system and be subject to
paragraph (C) of this rule unless otherwise specified by the director .Upon
directors approval,the wholesale system may replace a current monitoring
location with a master meter location if the current monitoring location has
not exceeded the OEL or had an LRAA exceed an MCL for a time period determined
by the director as appropriate.
(e)
Public water
systems required to monitor at master meter locations under this rule may
reduce or stop monitoring upon directors approval at these locations if the
issue causing the elevated concentrations of DBPs has been resolved and
monitoring results at these locations are consistently below the
MCL .
(f)
The director may require additional public water
systems involved with the conveyance of water to a consecutive public water
system to comply with the requirements of this rule.
Notes
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.04
Prior Effective Dates: 12/27/1978, 08/24/1981, 03/29/1988, 05/22/1989, 09/13/1993, 01/01/2002, 01/01/2003, 08/01/2005, 01/01/2010, 02/23/2015
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