Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 25 - LONG TERM 2 (LT2) ENHANCED SURFACE WATER TREATMENT › Section 179-25-023 - REPORTING REQUIREMENTS

Current through June 17, 2024
023.01 Systems must
				report sampling schedules and source water monitoring results unless they
				notify the Department that they will not conduct source water monitoring due to
				meeting monitoring avoidance criteria.
023.02 Filtered systems must report their
Cryptosporidium
bin classification as described in 179 NAC
				25-012.
023.03 Unfiltered systems must report their
				mean source water
Cryptosporidium
level as described in 179
				NAC
				25-014.
023.04 Systems must report disinfection
				profiles and benchmarks to the Department as described in 179 NAC
				25-010 through
				25-011 prior to making a significant
				change in disinfection practice.
023.05 Systems must report to the Department
				in accordance with the following table for any microbial toolbox options used
				to comply with treatment requirements under 179 NAC
				25-013 or
				25-014. Alternatively, the Department
				may approve a system to certify operation within required parameters for
				treatment credit rather than reporting monthly operational data for toolbox
				options.
Microbial Toolbox Reporting Requirements
Toolbox Option
Systems must submit the following information
On the following schedule
1. Watershed control program (WCP)
(i) Notice of intention to develop a new or continue
							 an existing watershed control program
(ii) Watershed control plan
(iii) Annual watershed control program status
							 report
(iv) Watershed sanitary survey report
(i) No later than two years before the applicable
							 treatment compliance data in 179 NAC
							 25-015.
(ii) No later than one year before the applicable
							 treatment compliance date in 179 NAC
							 25-015.
(iii) Every 12 months, beginning one year after the
							 applicable treatment compliance date in179 NAC
							 25-015.
(iv) For community water systems, every three years
							 beginning three years after the applicable treatment compliance date in 179 NAC
							 25-015. For non-community water
							 systems, every five years beginning five years after the applicable treatment
							 compliance date in 179 NAC
							 25-015.
2. Alternative source/intake management
Verification that system has relocated the intake or
						  adopted the intake withdrawal procedure reflected in monitoring results
No later than the applicable treatment compliance date in
						  179 NAC
						  25-015.
3. Presedimentation
Monthly verification of the following: (i) Continuous
						  basin operation (ii) Treatment of 100% of the flow (iii) Continuous addition of
						  a coagulant (iv) At least 0.5-log mean reduction of influent turbidity or
						  compliance with alternative Department-approved performance criteria.
Monthly reporting within 10 days following the month in
						  which the monitoring was conducted, beginning on the applicable treatment
						  compliance date in 179 NAC
						  25-015.
4. Two-stage lime softening
Monthly verification of the following: (i) Chemical
						  addition and hardness precipitation occurred in two separate and sequential
						  softening stages prior to filtration (ii) Both stages treated 100% of the plant
						  flow
Monthly reporting within 10 days following the month in
						  which the monitoring was conducted, beginning on the applicable treatment
						  compliance date in 179 NAC
						  25-015.
5. Bank filtration
(GWR) :
(ii) If monthly average of daily maximum turbidity is
							 greater than 1 NTU, then system must report result and submit an assessment of
							 the cause.
No later than the applicable treatment compliance
							 date in 179 NAC
							 25-015.
Report within 30 days following the month in which
							 the monitoring was conducted, beginning on the applicable treatment compliance
							 date in 179 NAC
							 25-015.
6. Combined filter performance
Monthly verification of combined filter effluent (CFE)
						  turbidity levels less than or equal to 0.15 NTU in at least 95% of the 4 hour
						  CFE measurements taken each month
Monthly reporting within 10 days following the month in
						  which the monitoring was conducted, beginning on the applicable treatment
						  compliance date in179 NAC
						  25-015.
7. Individual filter performance
Monthly verification of the following: (i) Individual
						  filter effluent (IFE) turbidity levels less than or equal to 0.15 NTU in at
						  least 95% of samples each month in each filter (ii) No individual filter
						  greater than 0.3 NTU in two consecutive readings 15 minutes apart
Monthly reporting within 10 days following the month in
						  which the monitoring was conducted, beginning on the applicable treatment
						  compliance date in179 NAC
						  25-015.
8. Demonstration of performance
(i) Results from testing following a Department
							 approved protocol
(ii) As required by the Department, monthly
							 verification of operation within conditions of Department approval for
							 demonstration of performance credit
No later than the applicable treatment compliance date
						  in 179 NAC
						  25-015. Within 10 days following the
						  month in which monitoring was conducted, beginning on the applicable treatment
						  compliance date in 179 NAC
						  25-015.
9. Bag filters and cartridge filters.
(i) Demonstration that the following criteria are
							 met: (a) Process meets the definition of bag or cartridge filtration; (b)
							 Removal efficiency established through challenge testing that meets criteria in
							 179 NAC 25.
(ii) Monthly verification that 100% of plant flow
							 was filtered.
No later than the applicable treatment compliance
							 date in 179 NAC
							 25-015.
Within 10 days following the month in which
							 monitoring was conducted, beginning on the applicable treatment compliance date
							 in 179 NAC
							 25-015.
10. Membrane filtration
(i) Results of verification testing demonstrating the
							 following: (a) Removal efficiency established through challenge testing that
							 meets criteria in 179 NAC 25; (b) Integrity test method and parameters,
							 including resolution, sensitivity, test frequency, control limits, and
							 associated baseline.
(ii) Monthly report summarizing the following: (a)
							 All direct integrity tests above the control limit; (b) If applicable, any
							 turbidity or alternative Department-approved indirect integrity monitoring
							 results triggering direct integrity testing and the corrective action that was
							 taken.
No later than the applicable treatment compliance
							 date in 179 NAC
							 25-015.
Within 10 days following the month in which
							 monitoring was conducted, beginning on the applicable treatment compliance date
							 in 179 NAC
							 25-015.
11. Second stage filtration
Monthly verification that 100% of flow was filtered
						  through both stages and that first stage was preceded by coagulation step.
Within 10 days following the month in which monitoring
						  was conducted, beginning on the applicable treatment compliance date in 179 NAC
						  25-015.
12. Slow sand filtration (as secondary filter)
Monthly verification that both a slow sand filter and a
						  preceding separate stage of filtration treated 100% of flow from surface water
						  or GWUDI
Within 10 days following the month in which monitoring
						  was conducted, beginning on the applicable treatment compliance date in 179 NAC
						  25-015.
13. Chlorine dioxide
Summary of CT values for each day as described in 179
						  NAC 25-023.
Within 10 days following the month in which monitoring
						  was conducted, beginning on the applicable treatment compliance date in 179 NAC
						  25-015.
14. Ozone
Summary of CT values for each day as described in 179
						  NAC 25-023.
Within 10 days following the month in which monitoring
						  was conducted, beginning on the applicable treatment compliance date in 179 NAC
						  25-015.
15. UV
(i) Validation test results demonstrating operating
							 conditions that achieve required UV dose.
(ii) Monthly report summarizing the percentage of
							 water entering the distribution system that was not treated by UV reactors
							 operating within validated conditions for the required dose as specified in 179
							 NAC 25-023.04.
No later than the applicable treatment compliance
							 date in 179 NAC
							 25-015.
Within 10 days following the month in which
							 monitoring was conducted, beginning on the applicable treatment compliance date
							 in 179 NAC
							 25-015.