National Technology & Engineering Solutions of Sandia, LLC (NTESS), operator of Sandia National Laboratory under contract with Department of Energy (collectively referred to as “the Petitioners”) petitioned the New Mexico Water Quality Control Commission (WCSS) for a rulemaking to amend Water Quality Standards. The petitioners conducted a Use Attainability Analysis (UAA) and propose to amend 20.6.4.97 NMAC to establish Tijeras Arroyo, Rio Grande to Four Hills Bridge (AU NM-9000.A_070) as ephemeral. Designated uses would be amended to reflect the change from intermittent to ephemeral and would thereby remove Primary Human Contact and Marginal Warmwater Aquatic Life and add Secondary Human Contact and Limited Aquatic Life. The WQCC granted a request for a hearing on this matter that has been scheduled for October 14, 2025.
| Tijeras Arroyo UAA and Public Involvement Plan | February 8, 2025 |
| WQCC Docketed Matters Webpage | June 4, 2025 |
| NMED Events Calendar | August 12, 2025 |
| Public Comment Portal | August 12, 2025 |
| Petition to Amend 20.6.4 NMAC | June 4, 2025 |
| Scheduling and Pre-hearing Order | July 25, 2025 |
| Public Notice (English) | August 12, 2025 |
| Public Notice (Spanish) | August 12, 2025 |
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