Nebraska Administrative Code
Topic - HEALTH AND HUMAN SERVICES SYSTEM
Title 179 - PUBLIC WATER SYSTEMS
Chapter 24 - STAGE 2 DISINFECTANTS AND DISINFECTION BYPRODUCTS (DBPs)
Section 179-24-009 - OPERATIONAL EVALUATION LEVELS
Universal Citation: 179 NE Admin Rules and Regs ch 24 ยง 009
Current through September 17, 2024
009.01 A 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 4 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 4 to determine an average, exceeds 0.060 mg/L.
009.02 Operational Evaluations
24-009.02A If a system exceeds
the operational evaluation level, the system must conduct an operational
evaluation and submit a written report of the evaluation to the Department no
later than 90 days after being notified of the analytical result that caused
the system to exceed the operational evaluation level. The written report must
be made available to the public upon request.
24-009.02B A system's operational evaluation
must include an examination of system treatment and distribution operational
practices, including storage tank operations, excess storage capacity,
distribution system flushing, changes in source(s) or source water quality, and
treatment changes or problems that may contribute to TTHM and HAA5 formation
and what steps could be considered to minimize future exceedences.
24-009.02B1 A system may request and the
Department may allow the system to limit the scope of its evaluation if the
system is able to identify the cause of the operational evaluation level
exceedance.
24-009.02B2 A system's
request to limit the scope of the evaluation does not extend the schedule in
179 NAC
24-009.02A for
submitting the written report. The Department must approve this limited scope
of evaluation in writing and the system must keep that approval with the
completed report.
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