Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 16 - DISINFECTANTS AND DISINFECTION BYPRODUCTS › Section 179-16-008 - TREATMENT TECHNIQUE FOR CONTROL OF DISINFECTION BYPRODUCT (DBP) PRECURSORS

Current through June 17, 2024
008.01
				Applicability
16-008.01A Public water systems
				using surface water or ground water under the direct influence of surface water
				using conventional filtration treatment must operate with enhanced coagulation
				or enhanced softening to achieve the TOC percent removal levels specified in
				179 NAC 16-008.02 unless the system meets at least one of the alternative
				compliance criteria listed in 179 NAC
				16-008.01B or
				16-008.01C.
16.008.01B
Alternative Compliance Criteria for Enhanced Coagulation and Enhanced Softening
				Systems
: Public water systems using surface water or ground water
				under the direct influence of surface water using conventional filtration
				treatment may use the alternative compliance criteria in 179 NAC
				16-008.01B items
				1 through 6 to comply with this section in lieu of complying with 179 NAC
				16-008.02. Systems must still comply with monitoring requirements in 179 NAC
				16-005.04.
1. The system's source water TOC
				level, measured according to 179 NAC 16-004.04 item 3, is less than 2.0 mg/L,
				calculated quarterly as a running annual average.
2. The system's treated water TOC level,
				measured according to 179 NAC 16-004.04 item 3, is less than 2.0 mg/L,
				calculated quarterly as a running annual average.
3. The system's source water TOC level,
				measured according to 179 NAC 16-004.04 item 3, is less than 4.0 mg/L,
				calculated quarterly as a running annual average; the source water alkalinity,
				measured according to 179 NAC 16-004.04 item 1, is greater than 60 mg/L (as
				CaCO3), calculated quarterly as a running annual
				average; and either the TTHM and HAA5 running annual averages are no greater
				than 0.040 mg/L and 0.030 mg/L, respectively; or prior to the effective date
				for compliance in 179 NAC 16-001.01, the system has made a clear and
				irrevocable financial commitment not later than the effective date for
				compliance in 179 NAC 16-001.01 to use of technologies that will limit the
				levels of TTHMs and HAA5 to no more than 0.040 mg/L and 0.030 mg/L,
				respectively. Systems must submit evidence of a clear and irrevocable financial
				commitment, in addition to a schedule containing milestones and periodic
				progress reports for installation and operation of appropriate technologies, to
				the Department for approval not later than the effective date for compliance in
				179 NAC 16-001.01. These technologies must be installed and operating not later
				than June 30, 2005. Failure to install and operate these technologies by the
				date in the approved schedule will constitute a violation of these
				regulations.
4. The TTHM and HAA5
				running annual averages are no greater than 0.040 mg/L and 0.030 mg/L,
				respectively, and the system uses only chlorine for primary disinfection and
				maintenance of a residual in the distribution system.
5. The system's source water SUVA, prior to
				any treatment and measured monthly according to 179 NAC 16-004.04 item 4 is
				less than or equal to 2.0 L/mg-m, calculated quarterly as a running annual
				average.
6. The system's finished
				water SUVA, measured monthly according to 179 NAC 16-004.04 item 4 is less than
				or equal to 2.0 L/mg-m, calculated quarterly as a running annual
				average.
16.008.01C
Additional Alternative Compliance Criteria for Softening
				Systems
: Systems practicing enhanced softening that cannot achieve
				the TOC removals required by 179 NAC 16-008.02B may use the alternative
				compliance criteria in 179 NAC
				16-008.01C items
				1 and 2 in lieu of complying with 179 NAC
				16-008.02. Systems must still
				comply with the monitoring requirements in 179 NAC 16-005.04.
1. Softening that results in lowering the
				treated water alkalinity to less than 60 mg/L (as
				CaCO3), measured monthly according to 179 NAC 16-004.04
				item 1 and calculated quarterly as a running annual average.
2. Softening that results in removing at
				least 10 mg/L of magnesium hardness (as CaCO3), measured
				monthly according to 179 NAC 16-004.04 item 6 and calculated quarterly as an
				annual running average.