EQC202408itemAslides

DETP/24/574

Special meeting of Oregon Environmental Quality Commission Item A: Lower Columbia-Sandy Subbasin Temperature TMDL and Willamette Subbasins Temperature TMDL (Action) Please note that the hyperlinks for this item go to zip files that contain the staff report, attachments and appendices for each TMDL. DEQ has revised Total Maximum Daily Loads, or TMDLs, to address temperature impairments in the Lower Columbia-Sandy Subbasin and Willamette Subbasins with public participation. These TMDLs were issued by DEQ and approved by EPA between 2004 and 2010. DEQ is under a court order to update and replace these temperature TMDLs to make them consistent with the current temperature standards. These TMDLs must be updated because they were based in part on the Natural Conditions Criterion, a section of the temperature standard that was subject to litigation and has since been disapproved by EPA. Staff provided informational updates to the commission at the April 2022, May 2022, March 2023, and July 2023 meetings. At this special EQC meeting, DEQ will request the commission adopt these TMDLs by reference, into rule.