Statutes, codes, and regulations
Nebraska Administrative Code
HEALTH AND HUMAN SERVICES SYSTEMTitle 179 - PUBLIC WATER SYSTEMS
Chapter 19 - LONG TERM 1 (LT 1) ENHANCED SURFACE WATER TREATMENT (for Systems Serving Fewer Than 10,000 People)
Section 179-19-010 - INDIVIDUAL FILTER TURBIDITY REQUIREMENTS

179 Neb. Admin. Code, ch. 19, § 010

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Current through September 17, 2024
Section 179-19-010 - INDIVIDUAL FILTER TURBIDITY REQUIREMENTS
010.01 Systems that use surface water or ground water under the direct influence of surface water and serve fewer than 10,000 people and utilize conventional filtration or direct filtration must conduct continuous monitoring of turbidity for each individual filter. The following requirements apply to continuous turbidity monitoring:
1. Monitoring must be conducted using an approved method in 179 NAC 13-007.01;
2. Calibration of turbidimeters must be conducted using procedures specified by the manufacturer and by analytical test procedures contained in Technicai Notes on Drinking Water Methods, EPA-600/R- 94-173, October 1994 which is hereby incorporated by reference. (This document is available from the National Technical Information Service, NTIS PB 95-104766, U.S. Department of Commerce, 5285 Port Royal Road, Springfield, Virginia 22161. The toll-free number is 800-553-6847.) The document may be inspected at the Department of Health and Human Services Regulation and Licensure, Public Health Assurance Division, 301 Centennial Mall South, Lincoln, NE 68509.
3. Results of turbidity monitoring must be recorded at least every 15 minutes;
4. Monthly reporting must be completed according to 179 NAC 19-011.01; and
5. Records must be maintained according to 179 NAC 19-011.02.
010.02 Turbidity Monitoring Equipment Failure

If there is a failure in the continuous turbidity monitoring equipment, the system must conduct grab sampling every four hours in lieu of continuous monitoring until the turbidimeter is back on-line. The system has 14 days to resume continuous monitoring before a violation is incurred.

010.03 One Or Two Filters

If a system consists of only one or two filters, the system may conduct continuous monitoring of combined filter effluent turbidity in lieu of individual filter effluent turbidity monitoring. Continuous monitoring must meet the same requirements set forth in 179 NAC 19-010.01 items 1 through 4 and 19-010.02.

010.04 Follow-up action is required according to the following tables:

If

Your System Must

a. The turbidity of an individual filter (or the turbidity of combined filter effluent (CFE) for systems with 2 filters that monitor CFE in lieu of individual filters) exceeds 1.0 NTU in two consecutive recordings 15 minutes apart

Report to the Department by the 10th of the following month and include the filter number(s), corresponding date(s), turbidity value(s) which exceeded 1.0 NTU, and the cause (if known) for the exceedance(s).

If a System Was Required to Report to the Director

Your System Must

b. For three months in a row and turbidity exceeded 1.0 NTU in two consecutive recordings 15 minutes apart at the same filter (or CFE for systems with 2 filters that monitor CFE in lieu of individual filters)

Conduct a self-assessment of the filter(s) within 14 days of the day the filter exceeded 1.0 NTU in two consecutive measurements for the third straight month unless a CPE as specified in 17919-010.04 item c was required. Systems with two filters that monitor CFE in lieu of individual filters must conduct a self assessment on both filters. The self-assessment must consist of at least the following components: assessment of filter performance; development of a filter profile; identification and prioritization of factors limiting filter performance; assessment of the applicability of corrections; and preparation of a filter self-assessment report.

c. For two months in a row and turbidity exceeded 2.0 NTU in two consecutive recordings 15 minutes apart at the same filter (or CFE for systems with two filters that monitor CFE in lieu of individual filters)

Arrange to have a comprehensive performance evaluation (CPE) conducted by the Director or a third party approved by the Director not later than 60 days following the day the filter exceeded 2.0 NTU in two consecutive measurements for the second straight month. If a CPE has been completed by the Director or a third party approved by the Director within the 12 prior months or the system and the Director are jointly participating in an ongoing Comprehensive Technical Assistance (CTA) project at the system, a new CPE is not required. If conducted, a CPE must be completed and submitted to the Department no later than 120 days following the day the filter exceeded 2.0 NTU in two consecutive measurements for the second straight month.

010.05 Lime Softening

Systems that utilize lime softening may apply to the Director for alternative turbidity exceedance levels for the levels specified in the table in 179 NAC 19-010.04. The system must be able to demonstrate to the Director that higher turbidity levels are due to lime carryover only, and not due to degraded filter performance.

179 Neb. Admin. Code, ch. 19, § 010