TABLE OF CONTENTS 



Page 



LIST OF TABLES iv 



LIST OF FIGURES v 



EXECUTIVE SUMMARY viii 



LO INTRODUCTION 1 



2.0 METHODS 6 



2.1 Timeline 6 



2.2 Survey Area 6 



2.3 Navigation 6 



2.4 Bathymetric Data Collection and Processing 11 



2.5 REMOTS® Sediment-Profile Photography 12 



2.6 Side-Scan Sonar 13 



2.7 Sediment Grab Sampling 15 



2.8 Laboratory Analyses and Quality Assurance/Quality Control Results 15 



2.8. 1 Sediment Grain Size and Total Organic Carbon 15 



2.8.2 Polynuclear Aromatic Hydrocarbons (PAHs) 17 



2.8.3 Pesticides and Poly chlorinated Biphenyls (PCBs) 17 



2.8.4 Metals 17 



2.8.5 Quality Assurance/Quality Control 18 



2.8.5.1 Sample Tracking and Holding Times 18 



2.8.5.2 Method Blanks 19 



2.8.5.3 Assessment of Analytical Accuracy 19 



2.8.5.4 Assessment of Analytical Precision 21 



3.0 RESULTS 22 



3.1 WLIS Disposal Site Bathymetry 22 



3.2 WLIS I Mound 22 



3.2.1 Bathymetry 24 



3.2.2 REMOTS® Sediment-Profile Photography 24 



3.2.2.1 Sediment Grain Size and Stratigraphy 24 



3.2.2.2 Benthic Community Assessment 26 



3.3 WLIS H Mound 27 



3.3.1 Bathymetry 27 



3.3.2 REMOTS® Sediment-Profile Photography 33 



3.3.2.1 Sediment Grain Size and Stratigraphy 33 



3.3.2.2 Benthic Community Assessment 34 



3.4 WLIS Reference Areas 34 



