Nebraska Administrative Code
Topic - HEALTH AND HUMAN SERVICES SYSTEM
Title 179 - PUBLIC WATER SYSTEMS
Chapter 23 - INITIAL DISTRIBUTION SYSTEM EVALUATION (IDSE)
Section 179-23-004 - STANDARD MONITORING
Universal Citation: 179 NE Admin Rules and Regs ch 23 ยง 004
Current through September 17, 2024
004.01 Standard Monitoring Plan
A system's standard monitoring plan must comply with 179 NAC 23-004.01A through 23-004.01D. The system must prepare and submit its standard monitoring plan to the Department according to the time frame in 179 NAC 23-003.01.
23-004.01A A system's standard monitoring
plan must include a schematic of the system's 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 compliance monitoring.
23-004.01B A system's standard monitoring
plan must include justification of standard monitoring location selection and a
summary of data the system relied on to justify standard monitoring location
selection.
23-004.01C A system's
standard monitoring plan must specify the population served and system type:
surface water/GWUDI, or ground water.
23-004.01D A system must retain a complete
copy of its standard monitoring plan including any Department modification of
the system's standard monitoring plan, for as long as the system is required to
retain its IDSE.
004.02 Standard Monitoring
23-004.02A A system must
monitor as indicated in the following table. A system must collect dual sample
sets at each monitoring location. One sample in the dual sample set must be
analyzed for TTHMs. The other sample in the dual sample set must be analyzed
for HAA5. A system must conduct one monitoring period during the peak
historical month for TTHM levels or HAA5 levels or the month of warmest water
temperature. A system must review available compliance, study, or operational
data to determine the peak historical month for TTHM or HAA5 levels or warmest
water temperature.
| Source water type | Population size category | Monitoring periods and frequency of sampling | Distribution system monitoring locations1 | ||||
| Total per monitoring period | Near entry points | Average residence time | High TTHM locations | High HAA5 locations | |||
| Surface water and ground water under the direct influence of surface water | <500 consecutive systems | One (during peak historical month)2 | 2 | 1 | 1 | ||
| <500 non-consecutive systems | One (during peak historical month)2 | 2 | 1 | 1 | |||
| 500-3,300 consecutive systems | Four (every 90 days) | 2 | 1 | 1 | |||
| 500-3,300 non-consecutive systems | Four (every 90 days) | 2 | 1 | 1 | |||
| 3,301 - 9,999 | Four (every 90 days) | 4 | 1 | 2 | 1 | ||
| 10, 000-49,999 | Six (every 60 days) | 8 | 1 | 2 | 3 | 2 | |
| 50, 000-249,999 | Six (every 60 days) | 16 | 3 | 4 | 5 | 4 | |
| 250, 000-999,999 | Six (every 60 days) | 24 | 4 | 6 | 8 | 6 | |
| 1,000, 000-4,999,999 | Six (every 60 days) | 32 | 6 | 8 | 10 | 8 | |
| >=5,000,000 | Six (every 60 days) | 40 | 8 | 10 | 12 | 10 | |
| Ground Water | <500 consecutive systems | One (during peak historical month)2 | 2 | 1 | 1 | ||
| <500 non-consecutive systems | One (during peak historical month)2 | 2 | 1 | 1 | |||
| 500-9,999 | Four (every 90 days) | 2 | 1 | 1 | |||
| 10, 000-99,999 | Four (every 90 days) | 6 | 1 | 1 | 2 | 2 | |
| 100, 000-499,999 | Four (every 90 days) | 8 | 1 | 1 | 3 | 3 | |
| >=500,000 | Four (every 90 days) | 12 | 2 | 2 | 4 | 4 | |
1 A dual sample set (i.e., a TTHM and an HAA5 sample) must be taken at each monitoring location during each monitoring period.
2 The peak historical month is the month with the highest TTHM or HAA5 levels or the warmest water temperature.
23-004.02B
Systems must take samples at locations other than the existing 179 NAC 16 or 24
monitoring locations. Monitoring locations must be distributed throughout the
distribution system.
23-004.02C 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, systems 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 system must take
samples at entry points to the distribution system having the highest annual
water flows.
23-004.02D Standard
monitoring may not be reduced.
004.03 IDSE Report
IDSE reports must include the elements required in 179 NAC 23-004.03A through 23-004.03D. IDSE reports must be submitted to the Department according to the time frame in 179 NAC 23-003.01.
23-004.03A An IDSE
report must include all TTHM and HAA5 analytical results from 179 NAC 16 or 24
compliance monitoring and all standard monitoring conducted during the period
of the IDSE as individual analytical results and locational running annual
averages (LRAAs) presented in a tabular or spreadsheet format acceptable to the
Department. If changed from the standard monitoring plan submitted under 179
NAC
23-004.01, the report must also
include a schematic of the distribution system, the population served, and
system type: surface water/GWUDI or ground water.
23-004.03B The IDSE report must include an
explanation of any deviations from the system's approved standard monitoring
plan.
23-004.03C A system must
recommend and justify 179 NAC 24 compliance monitoring locations and timing
based on the protocol in 179 NAC
23-008.
23-004.03D A system must retain a complete
copy of its IDSE report submitted under 179 NAC 23-004 or 40 CFR 141 Subpart U
for 10 years after the date that the report was submitted. If the Department
modifies the 179 NAC 24 monitoring requirements that a system recommended in
its IDSE report or if the Department approves alternative monitoring locations,
the system must keep a copy of the Department's notification on file for 10
years after the date of the Department's notification. Systems must make the
IDSE report and any Department notification available for review by the
Department or the public.
Disclaimer: These regulations may not be the most recent version. Nebraska 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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