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San Diego Region – Sediment Toxicity TMDLs for the Mouths of Chollas, Paleta, and Switzer Creeks
Background
Sediments in San Diego Bay near the mouths of Chollas, Paleta, and Switzer Creeks are contaminated with anthropogenic chemicals. In addition, these sites contain a degraded benthic macroinvertebrate community, and samples from these areas have demonstrated toxicity to various marine invertebrate species in laboratory toxicity tests. As a consequence, these sites have been identified as areas of impaired water quality. In response to this contamination, the Regional Board has initiated efforts to develop TMDLs for these sites
303(d) Listings
| Mouth of Chollas Creek | Sediment Toxicity and Benthic Community Degradation |
| Mouth of Paleta Creek (Seventh Street Channel) | Sediment Toxicity and Benthic Community Degradation |
| Mouth of Switzer Creek | PAHs and Chlordane (1) |
(1) The listing for lindane was delisted by the San Diego Water Board in the 2008 303(d) List Update adopted on December 16, 2009. The delisting was subsequently approved by the State Water Board on August 4, 2010 and by the U.S. Environmental Protection Agency on November 12, 2010.
TOXIC POLLUTANTS IN SEDIMENT TMDLS FOR THE MOUTHS OF CHOLLAS, PALETA, AND SWITZER CREEKS
The proposed TMDLs being developed for each water body are as follows
| Mouth of Chollas Creek | PCBs, PAHs, Chlordane |
| Mouth of Paleta Creek (Seventh Street Channel | PCBs, PAHs, Chlordane |
| Mouth of Switzer Creek | PCBs, PAHs, Chlordane |
How to Receive Updates on the Chollas, Paleta, Switzer Creek Mouths Toxics TMDLs
The San Diego Regional Board would like to keep interested persons fully informed during the final approval process for Chollas, Paleta, and Switzer Creek Metals TMDLs, including approval by the State Water Board, the OAL, and the USEPA. Updates on the TMDLs will only be sent to persons that specifically request this information. To receive updates from the San Diego Regional Board, you must either: 1) subscribe to our electronic mailing list; or 2) send an email request to the contact person listed below to have information sent to you via U. S. Mail. You can subscribe to our electronic mailing list. You may also obtain information from our Website or by appointment at the San Diego Regional Board office.
Stakeholder Outreach
Public Workshop and CEQA Scoping Meeting on TMDLs for the Mouths of Paleta, Chollas, and Switzer Creeks– October 14, 2008
- Notice for Public Workshop
- Agenda
- Public Workshop Presentation
- CEQA Scoping Meeting Presentation
- Regional Board requests that stakeholders/public submit comments on environmental impacts from reasonably foreseeable methods of compliance in implementation of TMDLs project, see handout
SD Bay Sediment TMDLs Stakeholder Meetings – September 27, 2005 through September 15, 2008
- SD Bay Sediment TMDLs Stakeholder Meetings ( to view presentations.)
Public Workshop on TMDLs for the Mouths of Chollas and Paleta Creeks– January 18, 2005
- Notice for Public Workshop
- Agenda
- Presentation Slides on TMDL Background Information
- Presentation Slides on Phase I Results
- Presentation Slides on Phase II Results
- Presentation Slides on What's Next
Public Workshop for Phase I Results of the Switzer Creek, Downtown Anchorage, and B Street/Broadway Piers TMDLs – May 13, 2004
- Notice for Public Workshop
- Agenda
- Presentation of Slides on Overview of Switzer Creek, Downtown Anchorage, and B Street/Broadway Piers TMDLs
- Presentation of Slides on Phase I Preliminary Results
Public Workshop and CEQA Scoping Meeting on TMDLs for Mouth of Switzer Creek, B Street/Broadway Piers, and Downtown Anchorage – April 21, 2003
- Notice for Public Workshop
- Agenda
- Presentation Slides on Introduction to Downtown Anchorage, B Street / Broadway Piers, and Switzer Creek TMDLs
- Presentation Slides on Phase I Study
- Presentation Slides on CEQA Scoping Meeting
Scientific Studies and Reports
Phase I Final Report - Sediment Assessment Study for the Mouths of Chollas and Paleta Creeks – May 2005
Phase II Final Report – Temporal Assessment of Chemistry, Toxicity, and Benthic Communities in Sediment at the Mouths of Chollas Creek and Paleta Creek, San Diego Bay – November 2011
Phase II Final Report – Sediment Toxicity Identification Evaluation for the Mouths of Chollas and Paleta Creeks – November 2011
Phase I Final Report – Sediment Quality Assessment Study at B Street/Broadway Piers, Downtown Anchorage, and Switzer Creek – March 2004
Phase II Final Report – Temporal Variability, Causes of Impacts, and Likely Sources of Contaminants of Concern at B Street/Broadway Piers, Downtown Anchorage, and Switzer Creek – June 2005 (Includes Toxicity Identification Evaluation)
Technical Report: Monitoring and Modeling for Chollas, Paleta, and Switzer Creeks – May 2007
Watershed Modeling for Simulation of Loadings to San Diego Bay – June 2008
Receiving Water Model Configuration and Evaluation for the San Diego Bay Toxic Pollutants TMDLs – June 2008
For More Information
Any questions or comments regarding the TMDLs for the Mouths of Chollas, Paleta, and Switzer Creeks Sediment Toxicity TMDLs Project may be sent to Ms. Cynthia Gorham-Test, Environmental Scientist, at (858) 467-2957, or Ms. Lisa Honma, Environmental Scientist, at (858) 467-2960..