Utah Administrative Code
Topic - Environmental Quality
Title R309 - Drinking Water
Rule R309-210 - Monitoring and Water Quality: Distribution System Monitoring Requirements
Section R309-210-9 - Disinfection Byproducts - Initial Distribution System Evaluations
Universal Citation: UT Admin Code R 309-210-9
Current through Bulletin 2024-18, September 15, 2024
(1) General requirements.
(a) The requirements of this sub-section
establish monitoring and other requirements for identifying
R309-210-10 compliance monitoring locations for determining compliance with maximum
contaminant levels for total trihalomethanes (TTHM) and haloacetic acids
(five)(HAA5). The water system must use an Initial Distribution System
Evaluation (IDSE) to determine locations with representative high TTHM and HAA5
concentrations throughout the distribution system. IDSEs are used in
conjunction with, but separate from,
R309-210-8 compliance monitoring, to identify and select
R309-210-10 compliance monitoring locations.
(b) Applicability. Community water systems
that uses a primary or residual disinfectant other than ultraviolet light or
delivers water that has been treated with a primary or residual disinfectant
other than ultraviolet light; or if the system is a non-transient non-community
water systems that serves at least 10,000 people and uses a primary or residual
disinfectant other than ultraviolet light or delivers water that has been
treated with a primary or residual disinfectant other than ultraviolet light
are subject to these requirements.
(c) Schedule. The water system must comply
with the requirements of this subpart on the schedule in paragraph (c)(i).
(i) For water systems that are not part of a
combined distribution system and systems that serve the largest population in
the combined distribution system.
(A) For
water systems that serve a population greater than or equal to 100,000:
(I) The water system must submit a standard
monitoring plan or system specific study plan or 40/30 certification to the
Director by or receive very small system waiver from the Director by October 1,
2006.
(II) The water system must
complete the standard monitoring or system specific study by September 30,
2008.
(III) The water system must
submit the IDSE report to the Director by January 1, 2009.
(B) For water systems that serve a population
from 50,000 to 99,999:
(I) The water system
must submit a standard monitoring plan or system specific study plan or 40/30
certification to the Director by or receive very small system waiver from the
Director by April 1, 2007.
(II) The
water system must complete the standard monitoring or system specific study by
March 31, 2009.
(III) The water
system must submit the IDSE report to the Director by July 1, 2009.
(C) For water systems that serve a
population from 10,000 to 49,999:
(I) The
water system must submit a standard monitoring plan or system specific study
plan or 40/30 certification to the Director by or receive very small system
waiver from the Director by October 1, 2007.
(II) The water system must complete the
standard monitoring or system specific study by September 30, 2009.
(III) The water system must submit the IDSE
report to the Director by January 1, 2010.
(D) For community water systems that serve a
population less than 10,000:
(I) The water
system must submit a standard monitoring plan or system specific study plan or
40/30 certification to the Director by or receive very small system waiver from
the Director by April 1, 2008.
(II)
The water system must complete the standard monitoring or system specific study
by March 31, 2010.
(III) The water
system must submit the IDSE report to the Director by July 1, 2010.
(ii) For other water
systems that are part of a combined distribution system:
(A) For wholesale systems or consecutive
systems:
(I) The water system must submit a
standard monitoring plan or system specific study plan or 40/30 certification
to the Director by or receive very small system waiver from the Director at the
same time as the system with the earliest compliance date in the combined
distribution system.
(II) The water
system must complete the standard monitoring or system specific study at the
same time as the system with the earliest compliance date in the combined
distribution system.
(III) The
water system must submit the IDSE report to the Director by at the same time as
the system with the earliest compliance date in the combined distribution
system.
(iii)
If, within 12 months after the date the water system is required to submit the
information in (i)(A)(I), (B)(I), (C)(I), (D)(I) and (ii)(A)(I) above, the
Director does not approve the water system plan or notify the water system that
it has not yet completed its review, the water system may consider the plan
that was submitted as approved. The water system must implement that plan and
must complete standard monitoring or a system specific study no later than the
date identified in (i)(A)(II), (B)(II), (C)(II), (D)(II) and (ii)(A)(II)
above.
(iv) The water system must
submit the 40/30 certification under R309-210-9(4) by the date identified in
(i)(A)(II), (B)(II), (C)(II), (D)(II) and (ii)(A)(II) above.
(v) If, within three months after the date
identified in (i)(A)(III), (B)(III), (C)(III), (D)(III) and (ii)(A)(III) above
(nine months after the date identified in this column if the water system must
comply on the schedule in paragraph (c)(i)(C) of this section), the Director
does not approve the IDSE report or notify the water system that it has not yet
completed its review, the water system may consider the report submitted as
approved and must implement the recommended
R309-210-10 monitoring as required.
(vi) For
the purpose of the schedule in paragraph (c)(i) through (c)(v) of this section,
the Director may determine that the combined distribution system does not
include certain consecutive systems based on factors such as receiving water
from a wholesale system only on an emergency basis or receiving only a small
percentage and small volume of water from a wholesale system. The Director may
also determine that the combined distribution system does not include certain
wholesale systems based on factors such as delivering water to a consecutive
system only on an emergency basis or delivering only a small percentage and
small volume of water to a consecutive system.
(d) The water system must conduct standard
monitoring that meets the requirements in R309-210-9(2), or a system specific
study that meets the requirements in R309-210-9(3), or certify to the Director
that the water system meet 40/30 certification criteria under R309-210-9(4), or
qualify for a very small system waiver under R309-210-9(5).
(i) The water system must have taken the full
complement of routine TTHM and HAA5 compliance samples required of a system
with the population and source water under
R309-210-8 (or the water system must have taken the full complement of reduced TTHM and
HAA5 compliance samples required of a system with the population and source
water under
R309-210-8 if the water system meets reduced monitoring criteria under
R309-210-8) during the period specified in R309-210-9(4)(a) to meet the 40/ 30
certification criteria in R309-210-9(4) the water system must have taken TTHM
and HAA5 samples under
R309-200-4(3)
and
R309-210-8 to be eligible for the very small system waiver in R309-210-9(5).
(ii) If the water system has not taken the
required samples, the water system must conduct standard monitoring that meets
the requirements in R309-210-9(2), or a system specific study that meets the
requirements in R309-210-9(3).
(e) The water system must use only the
analytical methods specified in
R309-200-4(3),
or otherwise approved by EPA for monitoring under this subpart, to demonstrate
compliance with the requirements of this subpart.
(f) IDSE results will not be used for the
purpose of determining compliance with MCLs in
R309-200-5(3)(c).
(2) Standard monitoring.
(a) Standard monitoring plan. The standard
monitoring plan must comply with paragraphs (a)(i) through (a)(iv) of this
section. The water system must prepare and submit the standard monitoring plan
to the Director according to the schedule in R309-210-9(1)(c).
(i) The standard monitoring plan must include
a schematic of the distribution system (including distribution system entry
points and their sources, and storage facilities), with notes indicating
locations and dates of all projected standard monitoring, and all projected
R309-210-8 compliance monitoring.
(ii) The
standard monitoring plan must include justification of standard monitoring
location selection and a summary of data the water system relied on to justify
standard monitoring location selection.
(iii) The standard monitoring plan must
specify the population served and system type (surface water or ground
water).
(iv) The water system must
retain a complete copy of the standard monitoring plan submitted under this
paragraph (a), including any Director modification of the standard monitoring
plan, for as long as the water system is required to retain the IDSE report
under
R309-105-17(8).
(b) Standard monitoring.
(i) The water system must monitor as
indicated in paragraph (b)(i). The water system must collect dual sample sets
at each monitoring location. One sample in the dual sample set must be analyzed
for TTHM. The other sample in the dual sample set must be analyzed for HAA5.
The water system must conduct one monitoring period during the peak historical
month for TTHM levels or HAA5 levels or the month of warmest water temperature.
The water system must review available compliance, study, or operational data
to determine the peak historical month for TTHM or HAA5 levels or warmest water
temperature.
(A) Surface water systems
serving less than 500 population which are consecutive systems.
(I) One monitoring period per year, dual
sample sets must be taken during the peak historical month. Two dual samples
sets must be collected per monitoring period.
(II) One dual sample set must be taken at the
high TTHM location in the distribution system.
(III) One dual sample set must be taken near
the entry point of the disinfected water into the distribution
system.
(B) Surface
water systems serving less than 500 population which are non-consecutive
systems.
(I) One monitoring period per year,
dual sample sets must be taken during the peak historical month. Two dual
samples sets must be collected per monitoring period.
(II) One dual sample set must be taken at the
high TTHM location in the distribution system.
(III) One dual sample set must be taken at
the high HAA5 location in the distribution system.
(C) Surface water systems serving between 500
to 3,300 population which are consecutive systems.
(I) Four monitoring periods per year, dual
sample sets must be taken every 90 days. Two dual samples sets must be
collected per monitoring period.
(II) One dual sample set must be taken at the
high TTHM location in the distribution system.
(III) One dual sample set must be taken near
the entry point of the disinfected water into the distribution
system.
(D) Surface
water systems serving between 500 to 3,300 population which are non-consecutive
systems.
(I) Four monitoring periods per
year, dual sample sets must be taken every 90 days. Two dual samples sets must
be collected per monitoring period.
(II) One dual sample set must be taken at the
high TTHM location in the distribution system.
(III) One dual sample set must be taken at
the high HAA5 location in the distribution system.
(E) Surface water systems serving between
3,301 to 9,999 population.
(I) Four
monitoring periods per year, dual sample sets must be taken every 90 days. Four
dual samples sets must be collected per monitoring period.
(II) Two dual sample sets must be taken at
the high TTHM locations in the distribution system.
(III) One dual sample set must be taken at
the high HAA5 location in the distribution system.
(IV) One dual sample set must be taken at an
average residence time of the disinfected water in the distribution
system.
(F) Surface
water systems serving between 10,000 to 49,999 population.
(I) Six monitoring periods per year, dual
sample sets must be taken every 60 days. Eight dual samples sets must be
collected per monitoring period.
(II) Three dual sample sets must be taken at
the high TTHM locations in the distribution system.
(III) Two dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(IV) Two dual sample sets must be taken at an
average residence time of the disinfected water in the distribution
system.
(V) One dual sample set
must be taken near the entry point of the disinfected water into the
distribution system.
(G)
Surface water systems serving between 50,000 to 249,999 population.
(I) Six monitoring periods per year, dual
sample sets must be taken every 60 days. 16 dual samples sets must be collected
per monitoring period.
(II) Five
dual sample sets must be taken at the high TTHM locations in the distribution
system.
(III) Four dual sample sets
must be taken at the high HAA5 locations in the distribution system.
(IV) Four dual sample sets must be taken at
an average residence time of the disinfected water in the distribution
system.
(V) Three dual sample sets
must be taken near the entry point of the disinfected water into the
distribution system.
(H)
Surface water systems serving between 250,000 to 999,999 population.
(I) Six monitoring periods per year, dual
sample sets must be taken every 60 days. 24 dual samples sets must be collected
per monitoring period.
(II) Eight
dual sample sets must be taken at the high TTHM locations in the distribution
system.
(III) Six dual sample sets
must be taken at the high HAA5 locations in the distribution system.
(IV) Six dual sample sets must be taken at an
average residence time of the disinfected water in the distribution
system.
(V) Four dual sample sets
must be taken near the entry point of the disinfected water into the
distribution system.
(I)
Surface water systems serving between 1,000,000 to 4,999,999 population.
(I) Six monitoring periods per year, dual
sample sets must be taken every 60 days. 32 dual samples sets must be collected
per monitoring period.
(II) Ten
dual sample sets must be taken at the high TTHM locations in the distribution
system.
(III) Eight dual sample
sets must be taken at the high HAA5 locations in the distribution
system.
(IV) Eight dual sample sets
must be taken at an average residence time of the disinfected water in the
distribution system.
(V) Six dual
sample sets must be taken near the entry point of the disinfected water into
the distribution system.
(J) Surface water systems serving 5,000,000
or more population.
(I) Six monitoring
periods per year, dual sample sets must be taken every 60 days. 40 dual samples
sets must be collected per monitoring period.
(II) Twelve dual sample sets must be taken at
the high TTHM locations in the distribution system.
(III) Ten dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(IV) Ten dual sample sets must be taken at an
average residence time of the disinfected water in the distribution
system.
(V) Eight dual sample sets
must be taken near the entry point of the disinfected water into the
distribution system.
(K)
Ground water systems serving less than 500 population which are consecutive
systems.
(I) One monitoring period per year,
dual sample sets must be taken during the peak historical month. Two dual
samples sets must be collected per monitoring period.
(II) One dual sample set must be taken at the
high TTHM location in the distribution system.
(III) One dual sample set must be taken near
the entry point of the disinfected water into the distribution
system.
(L) Ground water
systems serving less than 500 population which are non-consecutive systems.
(I) One monitoring period per year, dual
sample sets must be taken during the peak historical month. Two dual samples
sets must be collected per monitoring period.
(II) One dual sample set must be taken at the
high TTHM location in the distribution system.
(III) One dual sample set must be taken at
the high HAA5 location in the distribution system.
(M) Ground water systems serving between 500
to 9,999 population.
(I) Four monitoring
periods per year, dual sample sets must be taken every 90 days. Two dual
samples sets must be collected per monitoring period.
(II) One dual sample set must be taken at the
high TTHM location in the distribution system.
(III) One dual sample set must be taken at
the high HAA5 location in the distribution system.
(N) Ground water systems serving between
10,000 to 99,999 population.
(I) Four
monitoring periods per year, dual sample sets must be taken every 90 days. Six
dual samples sets must be collected per monitoring period.
(II) Two dual sample sets must be taken at
the high TTHM locations in the distribution system.
(III) Two dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(IV) One dual sample set must be taken at an
average residence time of the disinfected water in the distribution
system.
(V) One dual sample set
must be taken near the entry point of the disinfected water into the
distribution system.
(O)
Ground water systems serving between 100,000 to 499,999 population.
(I) Four monitoring periods per year, dual
sample sets must be taken every 90 days. Eight dual samples sets must be
collected per monitoring period.
(II) Three dual sample sets must be taken at
the high TTHM locations in the distribution system.
(III) Three dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(IV) One dual sample set must be taken at an
average residence time of the disinfected water in the distribution
system.
(V) One dual sample set
must be taken near the entry point of the disinfected water into the
distribution system.
(P)
Ground water systems serving 500,000 or greater population.
(I) Four monitoring periods per year, dual
sample sets must be taken every 90 days. Twelve dual samples sets must be
collected per monitoring period.
(II) Four dual sample sets must be taken at
the high TTHM locations in the distribution system.
(III) Four dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(IV) Two dual sample sets must be taken at an
average residence time of the disinfected water in the distribution
system.
(V) Two dual sample sets
must be taken near the entry point of the disinfected water into the
distribution system.
(Q)
A dual sample set (i.e., a TTHM and an HAA5 sample) must be taken at each
monitoring location during each monitoring period.
(R) The peak historical month is the month
with the highest TTHM or HAA5 levels or the warmest water
temperature.
(ii) The
water system must take samples at locations other than the existing
R309-210-8 monitoring locations. Monitoring locations must be distributed throughout the
distribution system.
(iii) If the
number of entry points to the distribution system is fewer than the specified
number of entry point monitoring locations, excess entry point samples must be
replaced equally at high TTHM and HAA5 locations. If there is an odd extra
location number, the water system must take a sample at a high TTHM location.
If the number of entry points to the distribution system is more than the
specified number of entry point monitoring locations, the water system must
take samples at entry points to the distribution system having the highest
annual water flows.
(iv) The system
monitoring under this paragraph (b) may not be reduced under the provisions of
R309-105-5(2).
(c) IDSE report. The IDSE report
must include the elements required in paragraphs (c)(i) through (c)(iv) of this
section. The water system must submit the IDSE report to the Director according
to the schedule in R309-210-9(1)(c).
(i) The
IDSE report must include all TTHM and HAA5 analytical results from
R309-210-8 compliance monitoring and all standard monitoring conducted during the period
of the IDSE as individual analytical results and LRAAs presented in a tabular
or spreadsheet format acceptable to the Director. If changed from the standard
monitoring plan submitted under paragraph (a) of this section, the report must
also include a schematic of the distribution system, the population served, and
system type (surface water or ground water).
(ii) The IDSE report must include an
explanation of any deviations from the approved standard monitoring
plan.
(iii) The water system must
recommend and justify
R309-210-10 compliance monitoring locations and timing based on the protocol in
R309-210-9(6).
(iv) The water
system must retain a complete copy of the IDSE report submitted under this
section for 10 years after the date that the water system submitted the report.
If the Director modifies the
R309-210-10 monitoring requirements that the water system recommended in the IDSE report or
if the Director approves alternative monitoring locations, the water system
must keep a copy of the Director's notification on file for 10 years after the
date of the Director's notification. The water system must make the IDSE report
and any Director notification available for review by the Director or the
public.
(3) System specific studies.
(a) System specific
study plan. The water system specific study plan must be based on either
existing monitoring results as required under paragraph (a)(i) of this section
or modeling as required under paragraph (a)(ii) of this section. The water
system must prepare and submit the system specific study plan to the Director
according to the schedule in R309-210-9(1)(c).
(i) Existing monitoring results. The water
system may comply by submitting monitoring results collected before the water
system is required to begin monitoring under R309-210-9(1)(c). The monitoring
results and analysis must meet the criteria in paragraphs (a)(i)(A) and
(a)(i)(B) of this section.
(A) Minimum
requirements.
(I) TTHM and HAA5 results must
be based on samples collected and analyzed in accordance with
R309-200-4(3).
Samples must be collected no earlier than five years prior to the study plan
submission date.
(II) The
monitoring locations and frequency must meet the conditions identified in this
paragraph (a)(i)(A)(II). Each location must be sampled once during the peak
historical month for TTHM levels or HAA5 levels or the month of warmest water
temperature for every 12 months of data submitted for that location. Monitoring
results must include all
R309-210-8 compliance monitoring results plus additional monitoring results as necessary
to meet minimum sample requirements.
(III) Surface water systems serving a
population less than 500 shall have data from:
(aa) three monitoring locations;
and
(bb) three samples for each
TTHM and HAA5.
(IV)
Surface water systems serving a population between 500 to 3,300 shall have data
from:
(aa) three monitoring locations;
and
(bb) nine samples each for TTHM
and HAA5.
(V) Surface
water systems serving a population between 3,301 to 9,999 shall have data from:
(aa) six monitoring locations; and
(bb) 36 samples each for TTHM and
HAA5.
(VI) Surface water
systems serving a population between 10,000 to 49,999 shall have data from:
(aa) 12 monitoring locations; and
(bb) 72 samples each for TTHM and
HAA5.
(VII) Surface
water systems serving a population between 50,000 to 249,999 shall have data
from:
(aa) 24 monitoring locations;
and
(bb) 144 samples each for TTHM
and HAA5.
(VIII) Surface
water systems serving a population between 250,000 to 999,999 shall have data
from:
(aa) 36 monitoring locations;
and
(bb) 216 samples each for TTHM
and HAA5.
(IX) Surface
water systems serving a population between 1,000,000 to 4,999,999 shall have
data from:
(aa) 48 monitoring locations;
and
(bb) 288 samples each for TTHM
and HAA5.
(X) Surface
water systems serving a population 5,000,000 or greater shall have data from:
(aa) 60 monitoring locations; and
(bb) 360 samples each for TTHM and
HAA5.
(XI) Ground water
systems serving a population less than 500 shall have data from:
(aa) three monitoring locations;
and
(bb) three samples for each
TTHM and HAA5.
(XII)
Ground water systems serving a population between 500 to 9,999 shall have data
from:
(aa) three monitoring locations;
and
(bb) nine samples each for TTHM
and HAA5.
(XIII) Ground
water systems serving a population between 10,000 to 99,999 shall have data
from:
(aa) 12 monitoring locations;
and
(bb) 48 samples each for TTHM
and HAA5.
(XIV) Ground
water systems serving a population between 100,000 to 499,999 shall have data
from:
(aa) 18 monitoring locations;
and
(bb) 72 samples each for TTHM
and HAA5.
(XV) Ground
water systems serving a population of 500,000 or greater shall have data from:
(aa) 24 monitoring locations; and
(bb) 96 samples each for TTHM and HAA5.
(B) Reporting
monitoring results. The water system must report the information in this
paragraph (a)(i)(B).
(I) The water system
must report previously collected monitoring results and certify that the
reported monitoring results include all compliance and non-compliance results
generated during the time period beginning with the first reported result and
ending with the most recent
R309-210-8 results.
(II) The water system must
certify that the samples were representative of the entire distribution system
and that treatment, and distribution system have not changed significantly
since the samples were collected.
(III) The study monitoring plan must include
a schematic of the distribution system (including distribution system entry
points and their sources, and storage facilities), with notes indicating the
locations and dates of all completed or planned system specific study
monitoring.
(IV) The water system
specific study plan must specify the population served and system type (surface
water or ground water).
(V) The
water system must retain a complete copy of the system specific study plan
submitted under this paragraph (a)(i), including any Director modification of
the system specific study plan, for as long as the water system is required to
retain the IDSE report under paragraph (b)(v) of this section.
(VI) If the water system submits previously
collected data that fully meet the number of samples required under paragraph
(a)(i)(A)(II) of this section and the Director rejects some of the data, the
water system must either conduct additional monitoring to replace rejected data
on a schedule the Director approves or conduct standard monitoring under
R309-210-9(2).
(ii) Modeling. The water system may comply
through analysis of an extended period simulation hydraulic model. The extended
period simulation hydraulic model and analysis must meet the criteria in this
paragraph (a)(ii).
(A) Minimum requirements.
(I) The model must simulate 24 hour variation
in demand and show a consistently repeating 24 hour pattern of residence
time.
(II) The model must represent
the criteria listed in paragraphs (a)(ii)(A)(II)(aa) through (ii) of this
section.
(aa) 75% of pipe volume;
(bb) 50% of pipe length;
(cc) All pressure zones;
(dd) All 12-inch diameter and larger
pipes;
(ee) All 8-inch and larger
pipes that connect pressure zones, influence zones from different sources,
storage facilities, major demand areas, pumps, and control valves, or are known
or expected to be significant conveyors of water;
(ff) All 6-inch and larger pipes that connect
remote areas of a distribution system to the main portion of the
system;
(gg) All storage facilities
with standard operations represented in the model; and
(hh) All active pump stations with controls
represented in the model; and
(ii)
All active control valves.
(III) The model must be calibrated, or have
calibration plans, for the current configuration of the distribution system
during the period of high TTHM formation potential. All storage facilities must
be evaluated as part of the calibration process. All required calibration must
be completed no later than 12 months after plan submission.
(B) Reporting modeling. The system
specific study plan must include the information in this paragraph (a)(ii)(B).
(I) Tabular or spreadsheet data demonstrating
that the model meets requirements in paragraph (a)(ii)(A)(II) of this
section.
(II) A description of all
calibration activities undertaken, and if calibration is complete, a graph of
predicted tank levels versus measured tank levels for the storage facility with
the highest residence time in each pressure zone, and a time series graph of
the residence time at the longest residence time storage facility in the
distribution system showing the predictions for the entire simulation period
(i.e., from time zero until the time it takes to for the model to reach a
consistently repeating pattern of residence time).
(III) Model output showing preliminary 24
hour average residence time predictions throughout the distribution
system.
(IV) Timing and number of
samples representative of the distribution system planned for at least one
monitoring period of TTHM and HAA5 dual sample monitoring at a number of
locations no less than would be required for the system under standard
monitoring in R309-210-9(2) during the historical month of high TTHM. These
samples must be taken at locations other than existing
R309-210-8 compliance monitoring locations.
(V) Description of how all requirements will
be completed no later than 12 months after the water system submits the system
specific study plan.
(VI) Schematic
of the distribution system (including distribution system entry points and
their sources, and storage facilities), with notes indicating the locations and
dates of all completed system specific study monitoring (if calibration is
complete) and all
R309-210-8 compliance monitoring.
(VII)
Population served and system type (surface water or ground water).
(VIII) The water system must retain a
complete copy of the system specific study plan submitted under this paragraph
(a)(ii), including any Director modification of the system specific study plan,
for as long as the water system is required to retain the IDSE report under
paragraph (b)(vii) of this section.
(C) If the water system submits a model that
does not fully meet the requirements under paragraph (a)(ii) of this section,
the water system must correct the deficiencies and respond to Director
inquiries concerning the model. If the water system fails to correct
deficiencies or respond to inquiries to the Director's satisfaction, the water
system must conduct standard monitoring under
R309-210-9(2).
(b) IDSE report. The IDSE report must include
the elements required in paragraphs (b)(i) through (b)(vi) of this section. The
water system must submit the IDSE report according to the schedule in
R309-210-9(1)(c).
(i) The IDSE report must
include all TTHM and HAA5 analytical results from
R309-210-8 compliance monitoring and all system specific study monitoring conducted during
the period of the system specific study presented in a tabular or spreadsheet
format acceptable to the Director. If changed from the system specific study
plan submitted under paragraph (a) of this section, the IDSE report must also
include a schematic of the distribution system, the population served, and
system type (surface water or ground water).
(ii) If the water system used the modeling
provision under paragraph (a)(ii) of this section, the water system must
include final information for the elements described in paragraph (a)(ii)(B) of
this section, and a 24- hour time series graph of residence time for each
R309-210-10 compliance monitoring location selected.
(iii) The water system must recommend and
justify
R309-210-10 compliance monitoring locations and timing based on the protocol in
R309-210-9(6).
(iv) The IDSE report
must include an explanation of any deviations from the approved system specific
study plan.
(v) The IDSE report
must include the basis (analytical and modeling results) and justification the
water system used to select the recommended
R309-210-10 monitoring locations.
(vi) The
water system may submit the IDSE report in lieu of the system specific study
plan on the schedule identified in R309-210-9(1) (c) for submission of the
system specific study plan if the water system believes that it has the
necessary information by the time that the system specific study plan is due.
If the water system elects this approach, the IDSE report must also include all
information required under paragraph (a) of this section.
(vii) The water system must retain a complete
copy of the IDSE report submitted under this section for 10 years after the
date the water system submitted the IDSE report. If the Director modifies the
R309-210-10 monitoring requirements the water system recommended in the IDSE report or if
the Director approves alternative monitoring locations, the water system must
keep a copy of the Director's notification on file for 10 years after the date
of the Director's notification. The water system must make the IDSE report and
any Director notification available for review by the Director or the
public.
(4) 40/30 certification.
(a) Eligibility. The
water system is eligible for 40/ 30 certification if it had no TTHM or HAA5
monitoring violations under
R309-210-8 of this part and no individual sample exceeded 0.040 mg/L for TTHM or 0.030
mg/L for HAA5 during an eight consecutive calendar quarter period beginning no
earlier than the date specified in this paragraph (a).
(i) If the 40/30 certification is due October
1, 2006 then the eligibility for 40/30 certification is based on eight
consecutive calendar quarters of
R309-210-8 compliance monitoring results beginning no earlier than January 2004.
(ii) If the 40/30 certification is due April
1, 2007 then the eligibility for 40/30 certification is based on eight
consecutive calendar quarters of
R309-210-8 compliance monitoring results beginning no earlier than January 2004.
(iii) If the 40/30 certification is due
October 1, 2007 then the eligibility for 40/30 certification is based on eight
consecutive calendar quarters of
R309-210-8 compliance monitoring results beginning no earlier than January 2005.
(iv) If the 40/30 certification is due April
1, 2008 then the eligibility for 40/30 certification is based on eight
consecutive calendar quarters of
R309-210-8 compliance monitoring results beginning no earlier than January 2005.
(v) Unless the water system is on reduced
monitoring under
R309-210-8 of this part and were not required to monitor during the specified period. If
the water system did not monitor during the specified period, the water system
must base its eligibility on compliance samples taken during the 12 months
preceding the specified period.
(b) 40/30 certification.
(i) The water system must certify to the
Director that every individual compliance sample taken under
R309-210-8 of this part during the periods specified in paragraph (a) of this section were
less than or equal to 0.040 mg/L for TTHM and less than or equal to 0.030 mg/L
for HAA5, and that the water system did not have any TTHM or HAA5 monitoring
violations during the period specified in paragraph (a) of this
section.
(ii) The Director may
require the water system to submit compliance monitoring results, distribution
system schematics, and/or recommended
R309-210-10 compliance monitoring locations in addition to the certification. If the water
system fails to submit the requested information, the Director may require
standard monitoring under R309-210-9(2) or a system specific study under
R309-210-9(3).
(iii) The Director
may still require standard monitoring under R309-210-9(2) or a system specific
study under R309-210-9(3) even if the water system meets the criteria in
paragraph (a) of this section.
(iv)
A water system must retain a complete copy of its certification submitted under
this section for 10 years after the date that the water system submitted the
certification. The water system must make the certification, all data upon
which the certification is based, and any Director notification available for
review by the Director or the public.
(5) Very small system waivers.
(a) If the water system serves fewer than 500
people and it has taken TTHM and HAA5 samples under
R309-210-8,
the water system is not required to comply with this subpart unless the
Director notifies the water system that it must conduct standard monitoring
under R309-210-9(2) or a system specific study under R309-210-9(3).
(b) If the water system has not taken TTHM
and HAA5 samples under
R309-210-8 or if the Director notifies the water system that the water system must comply
with this subpart, the water system must conduct standard monitoring under
R309-210-9(2) or a system specific study under R309-210-9(3).
(6) Stage 2 (R309-210-10) compliance monitoring location recommendations.
(a) The IDSE report must include the
recommendations and justification for where and during what month(s) TTHM and
HAA5 monitoring for
R309-210-10 of this part should be conducted. The water system must base the
recommendations on the criteria in paragraphs (b) through (e) of this
section.
(b) The water system must
select the number of monitoring locations specified in this paragraph (b). The
water system will use these recommended locations as
R309-210-10 routine compliance monitoring locations, unless Director requires different or
additional locations. The water system should distribute locations throughout
the distribution system to the extent possible.
(i) Surface water systems serving less than
500.
(A) One monitoring period per year. Two
dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the
high TTHM location in the distribution system.
(C) One dual sample set must be taken at the
high HAA5 location in the distribution system.
(ii) Surface water systems serving between
500 to 3,300.
(A) Four monitoring periods per
year, dual sample sets must be taken every 90 days. Two dual samples sets must
be collected per monitoring period.
(B) One dual sample set must be taken at the
high TTHM location in the distribution system.
(C) One dual sample set must be taken at the
high HAA5 location in the distribution system.
(iii) Surface water systems serving between
3,301 to 9,999 population.
(A) Four
monitoring periods per year, dual sample sets must be taken every 90 days. Two
dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the
high TTHM locations in the distribution system.
(C) One dual sample set must be taken at the
high HAA5 location in the distribution system.
(iv) Surface water systems serving between
10,000 to 49,999 population.
(A) Four
monitoring periods per year, dual sample sets must be taken every 90 days. Four
dual samples sets must be collected per monitoring period.
(B) Two dual sample sets must be taken at the
high TTHM locations in the distribution system.
(C) One dual sample set must be taken at the
high HAA5 locations in the distribution system.
(D) One dual sample set must be taken at an
existing
R309-210-8 compliance location.
(v)
Surface water systems serving between 50,000 to 249,999 population.
(A) Four monitoring periods per year, dual
sample sets must be taken every 90 days. Eight dual samples sets must be
collected per monitoring period.
(B) Three dual sample sets must be taken at
the high TTHM locations in the distribution system.
(C) Three dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(D) Two dual samples sets must be taken at an
existing
R309-210-8 compliance location.
(vi) Surface water systems serving between
250,000 to 999,999 population.
(A) Four
monitoring periods per year, dual sample sets must be taken every 90 days. 12
dual samples sets must be collected per monitoring period.
(B) Five dual sample sets must be taken at
the high TTHM locations in the distribution system.
(C) Four dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(D) Three dual sample sets must be taken at
an existing
R309-210-8 compliance location.
(vii) Surface water systems serving between
1,000,000 to 4,999,999 population.
(A) Four
monitoring periods per year, dual sample sets must be taken every 90 days. 16
dual samples sets must be collected per monitoring period.
(B) Six dual sample sets must be taken at the
high TTHM locations in the distribution system.
(C) Six dual sample sets must be taken at the
high HAA5 locations in the distribution system.
(D) Four dual sample sets must be taken at an
existing
R309-210-8 compliance location.
(viii) Surface water systems serving
5,000,000 or more population.
(A) Four
monitoring periods per year, dual sample sets must be taken every 90 days. 20
dual samples sets must be collected per monitoring period.
(B) Eight dual sample sets must be taken at
the high TTHM locations in the distribution system.
(C) Seven dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(D) Five dual sample sets must be taken at an
existing
R309-210-8 compliance location.
(ix) Ground water systems serving less than
500.
(A) One monitoring period per year. Two
dual samples sets must be collected per monitoring period.
(B) One dual sample set must be taken at the
high TTHM location in the distribution system.
(C) One dual sample set must be taken at the
high HAA5 location in the distribution system.
(x) Ground water systems serving between 500
to 9,999 population.
(A) One monitoring
period per year. Two dual samples sets must be collected per monitoring
period.
(B) One dual sample set
must be taken at the high TTHM location in the distribution system.
(C) One dual sample set must be taken at the
high HAA5 location in the distribution system.
(xi) Ground water systems serving between
10,000 to 99,999 population.
(A) Four
monitoring periods per year, dual sample sets must be taken every 90 days. Four
dual samples sets must be collected per monitoring period.
(B) Two dual sample sets must be taken at the
high TTHM locations in the distribution system.
(C) One dual sample set must be taken at the
high HAA5 locations in the distribution system.
(D) One dual sample set must be taken at an
existing
R309-210-8 compliance location.
(xii) Ground water systems serving between
100,000 to 499,999 population.
(A) Four
monitoring periods per year, dual sample sets must be taken every 90 days. Six
dual samples sets must be collected per monitoring period.
(B) Three dual sample sets must be taken at
the high TTHM locations in the distribution system.
(C) Two dual sample sets must be taken at the
high HAA5 locations in the distribution system.
(D) One dual sample set must be taken at an
existing
R309-210-8 compliance location.
(xiii) Ground water systems serving 500,000
or greater population.
(A) Four monitoring
periods per year, dual sample sets must be taken every 90 days. Eight dual
samples sets must be collected per monitoring period.
(B) Three dual sample sets must be taken at
the high TTHM locations in the distribution system.
(C) Three dual sample sets must be taken at
the high HAA5 locations in the distribution system.
(D) Two dual sample sets must be taken at an
existing
R309-210-8 compliance location.
(xiv) All systems must monitor during month
of highest DBP concentrations.
(xv)
Systems on quarterly monitoring must take dual sample sets every 90 days at
each monitoring location, except for subpart H systems serving 500-3,300.
Systems on annual monitoring and subpart H systems serving 500- 3,300 are
required to take individual TTHM and HAA5 samples (instead of a dual sample
set) at the locations with the highest TTHM and HAA5 concentrations,
respectively. Only one location with a dual sample set per monitoring period is
needed if highest TTHM and HAA5 concentrations occur at the same location, and
month, if monitored annually).
(c) The water system must recommend
R309-210-10 compliance monitoring locations based on standard monitoring results, system
specific study results, and
R309-210-8 compliance monitoring results. The water system must follow the protocol in
paragraphs (c)(i) through (c)(viii) of this section. If required to monitor at
more than eight locations, the water system must repeat the protocol as
necessary. If the water system do not have existing
R309-210-8 compliance monitoring results or if the water system do not have enough
existing
R309-210-8 compliance monitoring results, the water system must repeat the protocol,
skipping the provisions of paragraphs (c)(iii) and (c)(vii) of this section as
necessary, until the water system have identified the required total number of
monitoring locations.
(i) Location with the
highest TTHM LRAA not previously selected as a
R309-210-10 monitoring location.
(ii) Location
with the highest HAA5 LRAA not previously selected as a
R309-210-10 monitoring location.
(iii) Existing
R309-210-8 average residence time compliance monitoring location (maximum residence time
compliance monitoring location for ground water systems) with the highest HAA5
LRAA not previously selected as a
R309-210-10 monitoring location.
(iv) Location
with the highest TTHM LRAA not previously selected as a
R309-210-10 monitoring location.
(v) Location
with the highest TTHM LRAA not previously selected as a
R309-210-10 monitoring location.
(vi) Location
with the highest HAA5 LRAA not previously selected as a
R309-210-10 monitoring location.
(vii) Existing
R309-210-8 average residence time compliance monitoring location (maximum residence time
compliance monitoring location for ground water systems) with the highest TTHM
LRAA not previously selected as a
R309-210-10 monitoring location.
(viii)
Location with the highest HAA5 LRAA not previously selected as a
R309-210-10 monitoring location.
(d)
The water system may recommend locations other than those specified in
paragraph (c) of this section if the water system include a rationale for
selecting other locations. If the Director approves the alternate locations,
the water system must monitor at these locations to determine compliance under
R309-210-10 of this part.
(e) The recommended
schedule must include
R309-210-10 monitoring during the peak historical month for TTHM and HAA5 concentration,
unless the Director approves another month. Once the water system have
identified the peak historical month, and if the water system is required to
conduct routine monitoring at least quarterly, the water system must schedule
R309-210-10 compliance monitoring at a regular frequency of every 90 days or
fewer.
Disclaimer: These regulations may not be the most recent version. Utah may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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