Which of the following is NOT a violation of the refrigerant management regulations under the Clean Air Act? (A) A) Failing to evacuate refrigerant in a system to the required evacuation level. (B) B) Servicing a system that uses CFCs or HCFCs after the phaseout of those refrigerants, (C) C) Failing to evacuate refrigerant in a leaking system to at least 0 psig. (D) Adding nitrogen to a fully charged system, then calling the mixture a "leak check gas" and venting the mixture to the atmosphere.

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Under the Clean Air Act (CAA), refrigerant management regulations are designed to minimize the release of harmful refrigerants into the atmosphere. Let's analyze each option to determine which one **does not** constitute a violation:

**(A) Failing to evacuate refrigerant in a system to the required evacuation level.**
- **Violation:** Proper evacuation is essential to ensure that refrigerants are not released during servicing or disposal. Failing to meet the required evacuation level directly violates CAA regulations.

**(B) Servicing a system that uses CFCs or HCFCs after the phaseout of those refrigerants.**
- **Violation:** The CAA has phased out the use of certain ozone-depleting substances like CFCs and HCFCs. Servicing systems with these refrigerants after their phaseout period is prohibited and constitutes a violation.

**(C) Failing to evacuate refrigerant in a leaking system to at least 0 psig.**
- **Violation:** Proper evacuation involves creating a vacuum to remove refrigerants effectively. Failing to achieve even a minimal evacuation level (e.g., 0 psig) means refrigerants could escape into the atmosphere, violating CAA regulations.

**(D) Adding nitrogen to a fully charged system, then calling the mixture a "leak check gas" and venting the mixture to the atmosphere.**
- **Not a Violation:** The CAA allows for the use of inert gases like nitrogen for leak checks, provided that the primary refrigerant is not vented. When nitrogen is used appropriately and the mixture is intended solely for leak checking without releasing significant amounts of refrigerants, it does **not** violate CAA regulations.

**Conclusion:**
Among the options provided, **Option D** is **not** a violation of the refrigerant management regulations under the Clean Air Act when performed correctly.

**Answer:**  
**D) Adding nitrogen to a fully charged system, then calling the mixture a "leak check gas" and venting the mixture to the atmosphere.**
Adding nitrogen to a fully charged system for leak checking without releasing refrigerants does not violate the Clean Air Act's refrigerant management regulations.

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