TABLE OF CONTENTS 



Page 



LIST OF FIGURES iv 



EXECUTIVE SUMMARY ix 



1.0 INTRODUCTION 1 



2.0 METHODS 7 



2.1 Survey Area 7 



2.2 Bathymetry and Navigation 7 



2.3 Subbottom Profiling Operations 11 



2.4 Surface Sediment Characterization 14 



2.5 REMOTS® Sediment-Profile Photography 14 



2.6 Sediment Sampling and Analysis 16 



2.6.1 Sediment Toxicity Testing 16 



2.6.2 Sediment Chemistry 16 



2.7 Geotechnical Coring 19 



3.0 RESULTS 22 



3.1 NHAV93 Mound 22 



3.1.1 Bathymetry 22 



3.1.2 Subbottom 22 



3.1.3 REMOTS® Sediment Profiling 30 



3.1.4 Sediment Toxicity Testing 38 



3.1.5 Sediment Chemistry and Grain Size 40 



3.1.6 Geotechnical Coring 42 



3.2 MQR Mound 47 



3.2.1 Bathymetry 47 



3.2.2 Surface Sediment Characterization 49 



3.2.3 REMOTS® Sediment-Profile Photography 54 



3.2.4 Surface Sediment Chemistry and Grain Size 56 



3.3 CLIS Reference Areas 59 



3.3.1 REMOTS® Sediment-Profile Photography 61 



3.3.2 Sediment Chemistry and Grain Size 63 



3.4 Data Comparisons 64 



3.4.1 Sequential Bathymetric Surveys, X-Star Subbottom Profiler, 

 Geotechnical Core Comparison 64 



3.4.2 Sediment Acoustic Characterization System, Sediment Grab 

 Sampling Comparison 73 



