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  • Potholes Reservoir: Screening Survey for Dieldrin, Other Chlorinated Pesticides, and PCBs in Fish, Water, and Sediments

    September 2010 Publication No. 10-03-053

  • Publication and Contact Information This report is available on the Department of Ecology’s website at www.ecy.wa.gov/biblio/1003053.html Data for this project are available at Ecology’s Environmental Information Management (EIM) website www.ecy.wa.gov/eim/index.htm. Search User Study ID, BERA0005.

    Project Tracker Code for this study is 08-068. For more information contact: Publications Coordinator Environmental Assessment Program P.O. Box 47600, Olympia, WA 98504-7600 Phone: (360) 407-6764

    Washington State Department of Ecology - www.ecy.wa.gov/ o Headquarters, Olympia (360) 407-6000 o Northwest Regional Office, Bellevue (425) 649-7000 o Southwest Regional Office, Olympia (360) 407-6300 o Central Regional Office, Yakima (509) 575-2490 o Eastern Regional Office, Spokane (509) 329-3400 Cover photo: Walleye from Potholes Reservoir; photo taken by Randy Coots.

    Any use of product or firm names in this publication is for descriptive purposes only and does not imply endorsement by the author or the Department of Ecology.

    To ask about the availability of this document in a format for the visually impaired,

    call Joan LeTourneau at 360-407-6764. Persons with hearing loss can call 711 for Washington Relay Service.

    Persons with a speech disability can call 877-833-6341.

    http://www.ecy.wa.gov/biblio/1003053.html� http://www.ecy.wa.gov/eim/index.htm� http://www.ecy.wa.gov/�

  • Page 1

    Potholes Reservoir: Screening Survey for Dieldrin, Other Chlorinated Pesticides,

    and PCBs in Fish, Water, and Sediments

    by Brandee Era-Miller

    and Randy Coots

    Toxics Studies Unit Environmental Assessment Program

    Washington State Department of Ecology Olympia, Washington 98504-7710

    Waterbody Number: WA-41-9280.

  • Page 2

    This page is purposely left blank

  • Page 3

    Table of Contents

    Page

    List of Figures ......................................................................................................................5

    List of Tables .......................................................................................................................6

    Abstract ................................................................................................................................7

    Acknowledgements ..............................................................................................................8

    Introduction ..........................................................................................................................9 Dieldrin ..........................................................................................................................9 Study Area Description ................................................................................................10 Basin Contaminant History ..........................................................................................11

    PCBs and DDT in Potholes Reservoir .................................................................11 Dieldrin in Potholes Reservoir ............................................................................11 Dieldrin, DDT, and PCBs Downstream of Potholes Reservoir ...........................13

    Methods..............................................................................................................................15 Project Description.......................................................................................................15 Sampling Procedures ...................................................................................................16

    Fish Collection .....................................................................................................16 Preparation of Fish Tissue Samples ....................................................................17 Semipermeable Membrane Devices (SPMDs) ....................................................17 Sediments ............................................................................................................18 Decontamination Procedures ...............................................................................19

    Laboratory Analysis .....................................................................................................20

    Data Quality .......................................................................................................................21 Fish ...............................................................................................................................21 SPMDs .........................................................................................................................22

    Field Trip and Day0-Dialysis Blanks ..................................................................22 Water Samples .....................................................................................................23

    Sediment ......................................................................................................................23

    Results ................................................................................................................................25 Fish ...............................................................................................................................25 Water ............................................................................................................................27

    Ancillary Water Quality Parameters ...................................................................30 Sediments .....................................................................................................................31

    Discussion ..........................................................................................................................33 Fish ...............................................................................................................................33

    Comparisons to National Toxics Rule Criteria ...................................................33 Washington State Department of Health Review ................................................35 Dieldrin Compared to Other Fish Tissue Data ....................................................35 Correlation with Fish Size and Lipid Content .....................................................38

    Water ............................................................................................................................42 Comparisons to Water Quality Criteria ...............................................................42

  • Page 4

    Groundwater vs. Surface Water Inputs ...............................................................42 Dieldrin in Groundwater ......................................................................................45 Endosulfan Sulfate and Chlorpyriphos in Surface Water ....................................45

    Sediments .....................................................................................................................45 Comparisons to Sediment Quality Guidelines ....................................................45 Sediment Bioaccumulation ..................................................................................46

    Dieldrin Cycle in Potholes Reservoir ..........................................................................47

    Conclusions ........................................................................................................................49 Fish ...............................................................................................................................49 Water ............................................................................................................................49 Sediments .....................................................................................................................49 Dieldrin Cycle in Potholes Reservoir ..........................................................................50

    Recommendations ..............................................................................................................51

    References ..........................................................................................................................53

    Appendices .........................................................................................................................57 Appendix A. Glossary, Acronyms, and Abbreviations ...............................................59 Appendix B. Location and Sample Information .........................................................63 Appendix C. Data Quality Information ......................................................................71 Appendix D. Data and Criteria ...................................................................................81 Appendix E. 303(d) Fish Tissue Listings ...................................................................97

  • Page 5

    List of Figures Page

    Figure 1. Potholes Reservoir. ....................................................................................................... 10

    Figure 2. SPMD and Sediment Sampling Locations. ...........