Chapter 61 “Water Quality Standards” was amended to change numeric cal criteria for 20 chemical parameters to protect aquatic life for the following use designations: Class B(WW-1), Class B(WW-2), and Class B(WW-3); and change the numerical criteria for 42 chemical parameters to protect human health for Class HH – Human Health.

Technical Advisory Committee for Chemical Criteria (TAC):

• Roster (*.pdf file)
• Meeting Minutes, (*.pdf file)
• Numeric Chemical Criteria Review, (*.pdf file)
• Presentation - Designated Use Overview, (*.pdf file)
• Presentation - Aquatic Life Criteria Review, (*.pdf file)
• Aquatic Life Use Designation Discussion, (*.pdf file)
• Chemical Criteria Change in Approach Letter to TAC, (*.pdf file)

Responsiveness Summary

• Chemical Criteria (ARC 5898B) Responsiveness Summary, Sept. 10, 2007 (*.pdf)

Recently Adopted Final Rules:

• Final Rule: ARC 6352B – Chemical Criteria – Effective November 28, 2007 (*.pdf file)