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South Bay 2001 International Boundary and Water Commission Annual Receiving Waters Monitoring Report for the South Bay Ocean Outfall (2001) Prepared by: City of San Diego Ocean Monitoring Program Metropolitan Wastewater Department Environmental Monitoring and Technical Services Division June 2002 International Boundary and Water Commission Annual Receiving Waters Monitoring Report for the South Bay Ocean Outfall (2001) Table of Contents CREDITS & ACKNOWLEDGMENTS............................................................................................... iii EXECUTIVE SUMMARY ..................................................................................................................... 1 CHAPTER 1. GENERAL INTRODUCTION ....................................................................................5 SBOO Monitoring ................................................................................................................................5 Random Sample Regional Surveys .....................................................................................................6 Literature Cited ....................................................................................................................................7 CHAPTER 2. WATER QUALITY ........................................................................................................9 Introduction ..........................................................................................................................................9 Materials and Methods .......................................................................................................................9 Results and Discussion ..................................................................................................................... 13 Summary and Conclusions ...............................................................................................................22 Literature Cited .................................................................................................................................. 24 CHAPTER 3. SEDIMENT CHARACTERISTICS ......................................................................... 27 Introduction ........................................................................................................................................27 Materials and Methods ..................................................................................................................... 27 Results and Discussion ..................................................................................................................... 29 Summary and Conclusions ...............................................................................................................35 Literature Cited .................................................................................................................................. 36 CHAPTER 4. BENTHIC INFAUNA ................................................................................................. 39 Introduction ........................................................................................................................................39 Materials and Methods ..................................................................................................................... 39 Results and Discussion ..................................................................................................................... 41 Summary and Conclusions ...............................................................................................................47 Literature Cited .................................................................................................................................. 51 CHAPTER 5. DEMERSAL FISHES & MEGABENTHIC INVERTEBRATES........................ 55 Introduction ........................................................................................................................................55 Materials and Methods ..................................................................................................................... 55 Results and Discussion ...................................................................................................................... 57 Summary and Conclusions ...............................................................................................................62 Literature Cited .................................................................................................................................. 66 CHAPTER 6. BIOACCUMULATION OF CONTAMINANTS IN FISH TISSUES ................69 Introduction ........................................................................................................................................69 Materials and Methods ..................................................................................................................... 69 Results and Discussion ...................................................................................................................... 72 Summary and Conclusions ...............................................................................................................77 Literature Cited .................................................................................................................................. 79 APPENDICES Appendix A: Supporting Data - Sediment Characteristics............................................................83 Appendix B: Supporting Data - Demersal Fishes & Megabenthic Invertebrates ........................89 Appendix C: Supporting Data - Bioaccumulation of Contaminants in Fish Tissues .....................93 Appendix D: Random Sample Survey for 2001 - Sediment Quality ........................................... 135 Appendix E: Random Sample Survey for 2001 - Benthic Infauna ............................................. 147 i ii Credits and Acknowledgments Technical Editor Dean Pasko Production Editor John Byrne Graphics John Byrne Diane O’Donohue Judes Brooks Executive Summary Dean Pasko Chapter 1. General Introduction Dean Pasko Chapter 2. Water Quality Diane O’Donohue Chapter 3. Sediment Characteristics Daniel Ituarte Chapter 4. Benthic Infauna Eric Nestler John Byrne Chapter 5. Demersal Fishes & Megabenthic Invertebrates Ami Groce Robin Gartman Chapter 6. Bioaccumulation of Contaminants in Fish Tissues Ami Groce Acknowledgments: We are grateful to the personnel of the City’s Marine Biology Laboratory for their assistance in the collection and processing of all samples and for discussions of the results. The completion of this report would not have been possible without their continued efforts and contributions. We would also like to acknowledge the City’s Microbiology and Chemistry laboratories for providing the bacteriological and chemistry data analyzed herein. Reviews of the various chapters were provided by R. Duggan, A. Feit, R. Gartman, A. Groce, D. Ituarte, D. James, M. Lilly, E. Nester, D. Pasko, T. Stebbins, and R. Velarde. iii CITY OF SAN DIEGO OCEAN MONITORING PROGRAM Alan C. Langworthy Deputy Metropolitan Wastewater Director Environmental Monitoring and Technical Services Division Marine Biology & Ocean Operations Timothy Stebbins Senior Marine Biologist Kelvin Barwick Calvin Baugh Judes Brooks John Byrne Ross Duggan Adriano Feit Robin Gartman Ami Groce David Gutoff Daniel Ituarte David James Michael Kelly Kathy Langan-Cranford Megan Lilly Richard Mange Ricardo Martinez-Lara Ronda Nesby Eric Nestler Diane O’Donohue Dawn Olson Dean Pasko Rick Rowe Jack Russell Ron Velarde Wendy Storms Lan Wiborg Marine Microbiology / Vector Management Ric Amador Senior Biologist Arnold Adamos George Alphonso Toby Brown Roxanne Davis Andre Macedo Laila Othman Sonji Romero David Straup Zakee Shabazz iv Executive Summary Compliance monitoring for the South Bay Ocean Outfall (SBOO) is performed by the City of San Diego in accordance with a Memorandum of Understanding between the City and the United States International Boundary and Water Commission (IBWC). The study area extends from the tip of Point Loma southward to Punta Bandera, Baja California, Mexico, and from the shoreline seaward to a depth of about 200 ft. Prior to the initiation of discharge on 13 January 1999, the City also conducted a 3½ year baseline monitoring program that was designed to characterize background environmental conditions surrounding the outfall and provide information against which post-discharge data may be compared. The City has also conducted regionwide surveys off the San Diego coast during the summers of 1994 through 2001. Such regional monitoring helps to evaluate patterns and trends over a larger geographic area, thus providing additional information that may help to identify and distinguish reference areas from sites impacted by wastewater and stormwater discharge. The present report focuses on the SBOO monitoring results and conclusions from January through December 2001 and also discusses general differences with previous years. Sampling included monthly seawater measurements of physical, chemical and bacteriological parameters in order to document water quality conditions in the region. Sediment samples were collected semiannually to monitor changes in sediment quality and benthic infaunal community structure. Trawl surveys were performed quarterly to characterize communities of bottom­ dwelling fish and large invertebrates in the region (i.e., demersal fishes and megabenthic invertebrates). Chemical analyses
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