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 179-25-020 - TREATMENT PERFORMANCE TOOLBOX COMPONENTS

Universal Citation: 179 NE Admin Rules and Regs ch 25 ยง 020

Current through September 17, 2024

020.01 Combined Filter Performance

Systems using conventional filtration treatment or direct filtration treatment receive an additional 0.5-log Cryptosporidium treatment credit during any month the system meets the criteria in this paragraph. Combined filter effluent (CFE) turbidity must be less than or equal to 0.15 NTU in at least 95% of the measurements. Turbidity must be measured as described in 179 NAC 13-007.01 and 13-007.03.

020.02 Individual Filter Performance

Systems using conventional filtration treatment or direct filtration treatment receive 0.5-log Cryptosporidium treatment credit, which can be in addition to the 0.5-log credit under 179 NAC 25-020.01, during any month the system meets the criteria in this paragraph. Compliance with these criteria must be based on individual filter turbidity monitoring as described in 179 NAC 17-006 or 19-010, as applicable.

25-020.02A The filtered water turbidity for each individual filter must be less than or equal to 0.15 NTU in at least 95% of the measurements recorded each month.

25-020.02B No individual filter may have a measured turbidity greater than 0.3 NTU in two consecutive measurements taken 15 minutes apart.

25-020.02C Any system that has received treatment credit for individual filter performance and fails to meet the requirements of 179 NAC 25-020.02A or 25-020.02B during any month does not receive a treatment technique violation under 179 NAC 25-013.03 if the Department determines the following:
1. The failure was due to unusual and short-term circumstances that could not reasonably be prevented through optimizing treatment plant design, operation, and maintenance.

2. The system has experienced no more than two such failures in any calendar year.

020.03 Demonstration of Performance

The Department may approve

Cryptosporidium treatment credit for drinking water treatment processes based on a demonstration of performance study that meets the criteria in this paragraph. This treatment credit may be greater than or less than the prescribed treatment credits in 179 NAC 25-013 or 25-019 through 25-022 and may be awarded to treatment processes that do not meet the criteria for the prescribed credits.

25-020.03A Systems cannot receive the prescribed treatment credit for any toolbox option in 179 NAC 25-019 through 25-022 if that toolbox option is included in a demonstration of performance study for which treatment credit is awarded under this paragraph.

25-020.03B The demonstration of performance study must follow a Department-approved protocol and must demonstrate the level of Cryptosporidium reduction the treatment process will achieve under the full range of expected operating conditions for the system.

25-020.03C Approval by the Department must be in writing and may include monitoring and treatment performance criteria that the system must demonstrate and report on an ongoing basis to remain eligible for the treatment credit. The Department may designate such criteria where necessary to verify that the conditions under which the demonstration of performance credit was approved are maintained during routine operation.

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