Categorical Exclusion (CX) Determinations

Pacific Northwest Site Office Categorical Exclusion (CX) Determinations

Determination Date Name of Action: Description Categorical Exclusion Number
9/11/2025 Project Specific CX for Fission Gas Sampling B3.6
5/29/2025 Generic CX for Aviation Activities B3.2
5/29/2025 Generic CX for Facility Safety and Environmental Improvements B2.5
5/29/2025 Generic CX for General Agency Actions A.1, A.8, A.9, A.11, A.12, A.14
5/14/2025 Project Specific Categorical Exclusion for Atmospheric Radiation Measurement Aircraft Operation B3.2
4/25/2025 Generic Categorical Exclusion for Installation, Maintenance, Testing, and Calibration of Equipment B1.31, B2.2, B2.4
4/2/2025 Generic Categorical Exclusion For Transfer Actions B1.13
7/30/2024 Project Specific Categorical Exclusion for the Evaluation Of Spent Nuclear Fuel B3.6
4/9/2024 Generic Categorical Exclusion for Research Activities in Aquatic Environments B3.16
4/9/2024 Generic Categorical Exclusion for Small-Scale Renewable Energy Research and Development and Pilot Projects in Aquatic Environments B5.25
* Implicit in CX determinations are the following:
  1. There are no extraordinary circumstances related to the proposed action that may affect the significance of the environmental effects of the proposed action.
  2. The proposed action is not “connected” to other actions with potentially significant impacts.
  3. The proposed action is not related to other proposed actions with cumulatively significant impacts.
  4. The proposed action is not precluded by 40 CFR 1506.1 or 10 CFR 1021.211.
  5. For CX determinations made prior to November 14, 2011, CX number definitions can be found at: http://energy.gov/sites/prod/files/nepapub/nepa_documents/RedDont/CXR-10CFRPart1021-Changes.pdf