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, Chlordane, Lindane

 

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, Lindane

 

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

• Cover Letter
• Phase I Final Report
  • Phase I Appendices

Phase II Draft Report – Temporal Assessment of Chemistry, Toxicity, and Benthic Communities in Sediment at the Mouths of Chollas Creek and Paleta Creek, San Diego Bay – January 2005

• Temporal Assessment Report and Appendices

Phase II Draft Report – Sediment Toxicity Identification Evaluation for the Mouths of Chollas and Paleta Creeks – September 2005

• TIE Report

Phase I Final Report – Sediment Quality Assessment Study at B Street/Broadway Piers, Downtown Anchorage, and Switzer Creek – March 2004

• Phase I Final Report and Appendices
• Phase I Final Report Supplemental

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)

• Phase II Final Report
• Phase II Final Report Appendices

Technical Report: Monitoring and Modeling for Chollas, Paleta, and Switzer Creeks – May 2007

• Technical Report

Watershed Modeling for Simulation of Loadings to San Diego Bay – June 2008

• Technical Report

Receiving Water Model Configuration and Evaluation for the San Diego Bay Toxic Pollutants TMDLs – June 2008

• Technical Report
• Appendix A
• Appendix B
• Appendix C
• Appendix D
• Appendix E
• Appendix F

 

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..