Internal DEQ Memo Regarding Application of Dissolved Oxygen Criteria
- June 8, 2010 PDF
Updates DEQ's application of the DO criteria to the "salmon and
trout rearing and migration" beneficial use and the "redband or
lahontan cutthroat trout" beneficial use for Clean Water Act
Purposes, including the NPDES permit program, the TMDL program and
the assessment program.
- Clarification Letter from DEQ to EPA - Feb. 4, 2004 PDF
Provides clarification on Oregon's natural conditions provision and
the application of dissolved oxygen criteria for spawnng.
letter to EPA - Dec. 19, 2003 PDF
Regarding antidegradation, natural conditions, and temperature
Letter to EPA - June 22, 1998 PDF
Regarding benefical uses, temperature, dissolved oxygen, and pH