Arsenic

April 2012
- Thursday 19
  - Change of Address for Region 4, State and Local Agencies; Technical Correction
August 2011
- Thursday 11
  - Change of Address for Region 1; Technical Correction
June 2002
- Monday 10
  - Approval of the Clean Air Act, Section 112(l), Delegation of Authority to the Oregon Department of Environmental Quality and Lane Regional Air Pollution Authority
March 2002
- Thursday 14
  - Approval of the Clean Air Act Section 111 and 112 Delegation of Authority Updates to the Washington State Department of Ecology, Benton Clean Air Authority, Northwest Air Pollution Authority, Puget Sound Clean Air Agency, and Spokane County Air Pollution Control Authority
January 2002
- Wednesday 23
  - Approval of the Clean Air Act, Section 112(l), Delegation of Authority to the Idaho Department of Environmental Quality
September 2001
- Wednesday 19
  - Final Approval of the Clean Air Act, Section 112(l), Delegation of Authority to Washington Department of Ecology and Four Local Air Agencies in Washington
July 2001
- Tuesday 03
  - Proposed Approval of the Clean Air Act, Section 112(l), Delegation of Authority to Washington Department of Ecology and Four Local Air Agencies in Washington

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