Executive Summary: The New Mexico Environment Department (NMED) petitioned the Water Quality Control Commission (WQCC) to consider amendments to the Standards for Interstate and Intrastate Surface Waters, 20.6.4 NMAC. The Commission granted and held the hearing for matter 11-05 (R) on April 10, 2012. The WQCC approved the amendments which changed the aquatic life use for the lower Dry Cimarron River from coldwater to coolwater.
| Document | Author | Date |
| Public Draft of UAA | SWQB | August 2011 |
| Public Notice of Draft UAA | SWQB | August 12, 2011 |
| Public Comments | Various | August 10, 2011 |
| Response to Public Comments | SWQB | Not applicable |
| Petition for Hearing | SWQB | September 06, 2011 |
| Procedural and Scheduling Order | WQCC | March 02, 2012 |
| Hearing Notice | SWQB | Unknown |
| Hearing with Pleading Log | WQCC | April 10, 2012 |
| Final Order and Statement of Reasons | WQCC | June 7, 2012 |
| Integrated Rule 20.6.4 NMAC | SWQB | July 10, 2012 |
| Submittal Letter to EPA | WQCC | July 12, 2012 |
| EPA Response and Approval | EPA | November 26, 2012 |