Golden Pass LNG Terminal LP's et al CD containing its finalized Dredged Material Management Plan for the proposed Golden Pass LNG Terminal under CP04-386 et al. E:\PBS&J 2005

SABINE-NECHES WATERWAY CONTAMINANT ASSESSMENT Prepared for: U.S. Army Corps of Engineers Galveston District 2000 Fort Point Road Galveston, Texas 77550 Prepared by: PBS&J 206 Wild Basin Road, Suite 300 Austin, Texas 78746-3343 CONTRACT GS-10F-0005M Task Order W912HY-04-F-0007 May 2004 TABLE OF CONTENTS Section Page 1.0 INTRODUCTION 1 2.0 HTRW SITES 1 3.0 WATER QUALITY 3 3.1 WATER AND ELUTRIATE CHEMISTRY 4 3.1.1 Sabine-Neches Waterway 4 3.1.1.1 Entrance Channel 4 3.1.1.2 Sabine Pass Channel 5 3.1.1.3 Port Arthur Canal 6 3.1.1.4 Port Arthur Turning Basins 6 3.1.1.5 Taylor Bayou Turning Basin 6 3.1.1.6 Sabine-Neches Canal 7 3.1.1.7 Neches River Channel 7 3.2 SUMMARY 8 4.0 SEDIMENT QUALITY 8 4.1 SABINE-NECHES WATERWAY 9 4.1.1 Entrance Channel 9 4.1.2 Sabine Pass Channel 10 4.1.3 Port Arthur Canal 11 4.1.4 Port Arthur Turning Basins 11 4.1.5 Taylor Bayou Turning Basin 11 4.1.6 Sabine-Neches Canal 12 4.1.7 Neches River Channel 12 4.2 SUMMARY 13 5.0 REFERENCES 13 6.0 ACRONYMS AND ABBREVIATIONS 15 ii LIST OF FIGURES Figure Page 1 Channel Stations and Placement Areas, Sabine-Neches Waterway F-1 2 Channel Stations and Placement Areas, Sabine-Neches Waterway F-2 3 Channel Stations and Placement Areas, Sabine-Neches Waterway F-3 iii LIST OF TABLES Table Page 1 Summary of Priority HTRW Sites within Sabine-Neches Waterway T-1 2 Target Detection Levels (TDLs) for Analysis of Sediments and Water/Elutriate T-2 3 The Number and Percentages of Surviving Organisms in Sabine-Neches Waterway Suspended Particulate Bioassays T-5 4 The Number and Percentages of Surviving Organisms, Ten- day Solid Phase Bioassays, Sabine-Neches Waterway HTRW Sites T-6 5 The Growth, as Weight, of Surviving Mysids, Ten-day Solid Phase Bioassays, Sabine-Neches Waterway T-7 6 Classified Water Quality Segments in the Study Area T-8 7 Detected Parameters, Sabine-Neches Waterway, Entrance Channel T-9 8 Detected Parameters, Sabine-Neches Waterway, Sabine Pass Channel T-11 9 Detected Parameters, Sabine-Neches Waterway, Port Arthur Canal T-13 10 Detected Parameters, Sabine-Neches Waterway, Port Arthur Turnning Basins T-15 11 Detected Parameters, Sabine-Neches Waterway, Taylor Bayou Turning Basin T-17 12 Detected Parameters, Sabine-Neches Waterway, Sabine- Neches Canal T-19 13 Detected Parameters, Sabine-Neches Waterway, Neches River Channel T-26 14 Summary of Water Quality Standards/Criteria Exceedances by Water and Elutriate Samples T-32 15 Summary of Bioassay Data for Maintenance Material (% Survival), Entrance Channel, Sabine-Neches Waterway T-33 16 Summary of ERL Exceedances in Sediment Samples T-34 iv 1.0 INTRODUCTION The purpose of this Contaminant Assessment is to document the existing condition of material to be dredged during the deepening and widening of the Sabine-Neches Waterway (SNWW) relative to contaminants of concern. The SNWW is located in Jefferson and Orange counties, Texas, and borders Cameron and Calcasieu parishes, Louisiana. The proposed project includes deepening and selectiv