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Water Quality Objectives for pH and Turbidity
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Amendments to the Water Quality Control Plan for the Sacramento River and San Joaquin River Basins to delete the parts of the pH objective that limit the change in pH to 0.5 units and the allowance of averaging periods for pH. The amendments also limit turbidity to 2 Nephelometric Turbidity Units (NTUs) when the natural turbidity is less than 1 NTUs. Status: Adopted by the Regional Water Board on 25 October 2007 in Resolution No. R5-2007-0136, 40 KB, PDF (PDF info). These amendments have been approved by the State Water Board, the Office of Administrative Law, and the US Environmental Protection Agency. The amendments are now in effect and have been incorporated into the current Basin Plan (Fourth Edition, September 2009). For more information, contact Betty Yee at (916) 464-4643 or by email at: byee@waterboards.ca.gov.
- Resolution No. R5-2007-0136, 40 KB, PDF (PDF info)
- Final Staff Report, 465 KB, PDF (PDF info)
- Public Hearing
- Notice of Public Meeting, 14 KB, PDF (PDF info)
- Draft Staff Report, 497 KB, PDF (PDF info)
- Key Supporting Documents
- Robertson-Bryan, Inc. (RBI), 2004. pH Requirements of Freshwater Aquatic Life. Technical memorandum. May 2004, 239 KB, PDF (PDF info)
- RBI, 2006. Suspended Solids and Turbidity Requirements of Freshwater Aquatic Life and Example Relationship Between TSS (mg/L) and Turbidity (NTUs) for a Treated Municipal Effluent. March 2006, 532 KB, PDF (PDF info)
- RBI, 2006b. Visual Aesthetic Characterization of Low Turbidity Waters. March 2006, 333 KB, PDF (PDF info)
- Peer Review
This amendment was submitted for peer review comments in December 2004. Final peer review comments were received by December 2005. - CEQA Scoping Meeting
Regional Water Board staff conducted a CEQA scoping meeting on 19 August 2004 at the Regional Water Board’s office in Rancho Cordova.- Notice of CEQA Scoping Meeting, 79 KB, PDF (PDF info)
- CEQA Scoping Meeting Presentation, 24 KB, PDF (PDF info)
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