Dalco Passage Oil Spill King County Intertidal Sediment Reconnaissance Survey Final Report Prepared by the King County Department of Natural Resources and Parks Marine and Sediment Assessment Group August 2005 Department of Natural Resources and Parks Water and Land Resources Division 201 S Jackson St. Ste 600 Seattle, WA 98104 (206) 296-6519 Dalco Passage Oil Spill King County Intertidal Sediment Reconnaissance Survey Final Report Prepared by Scott Mickelson, Senior Water Quality Project Manager Marine and Sediment Assessment Group King County Department of Natural Resources and Parks 201 South Jackson Street, Suite 600 Seattle, Washington 98104 206-296-8247
[email protected] August 2005 TABLE OF CONTENTS 1 Introduction 1 2 Sample Collection 2 2.1 Station Locations and Positioning 2 2.2 Sample Collection and Handling 2 3 Sample Analysis 4 3.1 Sediment Conventionals 4 3.2 Petroleum Hydrocarbons and Trace Organic Compounds 4 3.3 Quality Assurance/Quality Control 4 4 Analytical Results 5 4.1 Sediment Conventionals 5 4.2 Petroleum Hydrocarbons and Trace Organic Compounds 5 4.2.1 Petroleum Hydrocarbons 6 4.2.2 Polynuclear Aromatic Hydrocarbons (PAHs) 6 4.2.3 Polychlorinated Biphenyls (PCBs) 6 4.2.4 Other Trace Organic Compounds 7 5 Summary 8 6 References 9 List of Figures Figure 1 – Sampling Locations List of Tables Table 1 – Sediment Conventional Results and Sample Metadata Table 2 – Sediment Chemistry Results List of Appendices Appendix A – Complete Analytical Results Appendix B – Quality Assurance Review Narrative i 1 INTRODUCTION This report presents the results of intertidal sediment sampling and analysis on Vashon and Maury Islands and the mainland shoreline of south King County.