San Diego Region – Sediment Toxicity TMDLs for the Mouths of Paleta, Chollas, and Switzer Creeks

Introduction

The San Diego Water Board issued a public notice on February 19, 2013 to initiate the public review process for the proposed project to amend the San Diego Basin Plan to incorporate TMDLs for toxic pollutants in sediment at the mouths of Paleta, Chollas, and Switzer creeks in San Diego Bay.

The Public Hearing for the San Diego Water Board to consider this Basin Plan amendment is scheduled for June 19, 2013. The deadline for submittal of written comments was April 8, 2013 at noon. Oral comments may be made at the hearing.The public review documents are available for viewing below. Please see Item 8 on the June 19, 2013 Agenda to view the Technical Supporting Documents.

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

PUBLIC DOCUMENTS (ALL DOCUMENTS ARE IN PDF FORMAT UNLESS OTHERWISE NOTED)

Public Comment Letters Received on April 8, 2013:

Procedural Request Letters Received on June 10, 2013

Public Review Draft for Proposed Basin Plan Amendment to Incorporate TMDLs for Toxic Pollutants in Sediment for Paleta, Chollas, and Switzer Creek Mouths and Miscellaneous Changes to Chapter 5

  • Notices of Filing and Public Hearing
  • Notice of Revised Public Hearing Date
  • Tentative Resolution No. R9-2013-0003 and Proposed Basin Plan Amendment (dated February 19, 2013)
  • Draft Technical Report (dated February 19, 2013)
  • Appendices
    • Appendix A - Peer Review Comments and Responses
    • Appendix B - Tentative Resolution No. R9-2013-0003 and Basin Plan Amendment
    • Appendix C-1 - Watershed Monitoring and Modeling Report (Schiff & Carter 2007)
    • Appendix C-2 - Watershed Modeling Report (Tetra Tech 2008b)
    • Appendix D - EFDC Receiving Water Modeling Report (Tetra Tech 2008a)
    • Appendix E - Watershed Modeling for Chollas, Switzer, and Paleta Creek Watersheds for Simulation of Loadings to San Diego Bay (Tetra Tech 2011)
    • Appendix F - Compilation of Sediment, Storm Water, and Water Quality Data Summaries for the Mouths of Paleta, Chollas, and Switzer Creeks
    • Appendix G - Facilities in the Watersheds of Paleta, Chollas, and Switzer Creeks Enrolled in the Industrial Storm Water General Permit
    • Appendix H - Environmental Analysis and Checklist
    • Appendix I - Supporting Documentation for Numeric Targets Development
    • Appendix J - Specific TMDL Provisions to be Incorporated into NPDES Permit and Waste Discharge Requirements for Discharges from the Municipal Separate Storm Sewer Systems (MS4s) Draining the Watersheds within the San Diego Region, Subsequent order for Order No. R9 2007 0001
    • Appendix K - Specific TMDL Provisions to be Incorporated into NPDES Permit and Waste Discharge Requirements for U.S. Navy, Naval Base San Diego, San Diego County, Order No. R9-2002-0169, or Subsequent Order
    • Appendix L - Specific TMDL Provisions to be Incorporated into NPDES Permit for Storm Water Discharges from the State of California, Department of Transportation (Caltrans) Properties, Facilities, and Activities (Order No. 99-06-DWQ), or Subsequent Order
    • Appendix M - Responses to Public Comment

Input files used for calculating the River Invertebrate Prediction and Classification System (RIVPACS) benthic index used in the sediment numeric target calculations (benthic community condition)

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

SD Bay Sediment TMDLs Stakeholder Meetings – September 27, 2005 through September 15, 2008

Public Workshop on TMDLs for the Mouths of Chollas and Paleta Creeks– January 18, 2005

Public Workshop for Phase I Results of the Switzer Creek, Downtown Anchorage, and B Street/Broadway Piers TMDLs – May 13, 2004

Public Workshop and CEQA Scoping Meeting on TMDLs for Mouth of Switzer Creek, B Street/Broadway Piers, and Downtown Anchorage – April 21, 2003

Scientific Studies and Reports

Technical Report: PAH Transport Study - October 2017

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

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  (Page last updated 11/9/17)