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HMI Year 25 (September 2006 – August 2007)

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HMI Year 25 (September 2006 – August 2007) Assessment of Impacts from the Hart- Miller Dredged Material Containment Facility, Maryland. Year 25 Exterior Monitoring Technical Report (September 2006 – August 2007) Prepared by: Maryland Department of the Environment TABLE OF CONTENTS LIST OF FIGURES ...................................................................................................................... IV LIST OF TABLES .......................................................................................................................VII DEFINTION OF TERMS............................................................................................................. IX SUMMARY REPORT FOR THE HART-MILLER ISLAND DREDGED MATERIAL CONTAINMENT FACILITY YEAR 25 ....................................................................................... 1 INTRODUCTION ...................................................................................................................... 2 HART-MILLER ISLAND STUDY DESIGN............................................................................ 2 HMI PROJECT SUMMARIES .................................................................................................. 4 Project II: Sedimentary Environment .................................................................................... 4 Project III: Benthic Community Studies................................................................................ 6 Project IV: Analytical Services.............................................................................................. 8 Metals in Sediments................................................................................................................ 8 South Cell Exterior Monitoring Stations 42, 43 and 44........................................................ 13 Metals in Clam Tissue .......................................................................................................... 13 Polychlorinated Biphenyls (PCB’s) in Sediment and Clams................................................ 13 Polycyclic Aromatic Hydrocarbons (PAHs) in Sediment and Clams .................................. 14 ACUTE TOXICITY STUDIES ................................................................................................ 14 SUMMARY OF PROJECT RECOMMENDATIONS............................................................ 16 APPENDIX 1: SEDIMENTARY ENVIRONMENT (PROJECT II) .......................................... 17 ACKNOWLEDGMENTS ............................................................................................................ 18 EXECUTIVE SUMMARY ...................................................................................................... 19 INTRODUCTION .................................................................................................................... 21 Previous Work....................................................................................................................... 22 Facility Operations ................................................................................................................ 24 OBJECTIVES ........................................................................................................................... 26 METHODS AND MATERIALS.............................................................................................. 26 Field Methods ....................................................................................................................... 26 Laboratory Procedures .......................................................................................................... 27 RESULTS AND DISCUSSION............................................................................................... 30 Sediment Distribution........................................................................................................... 30 Elemental Analyses............................................................................................................... 38 Interpretive Technique for Trace Metals .............................................................................. 38 SUMMARY AND RECOMMENDATIONS........................................................................... 48 REFERENCES ......................................................................................................................... 51 APPENDIX 1A: HMI GROUNDWATER MONITORING WELLS 2006 (PROJECT II) ........ 55 INTRODUCTION .................................................................................................................... 55 SUMMARY OF DATA............................................................................................................ 56 All Wells ............................................................................................................................... 56 North Cell Wells 2A & 6A................................................................................................... 56 South Cell Wells 8A, 10A & 12A and North Cell Well 4A................................................. 58 APPENDIX 2: BENTHIC COMMUNITY STUDIES (PROJECT III)....................................... 60 EXECUTIVE SUMMARY ...................................................................................................... 61 II INTRODUCTION .................................................................................................................... 63 METHODS AND MATERIALS.............................................................................................. 64 RESULTS AND DISCUSSION............................................................................................... 68 Water Quality........................................................................................................................ 68 Benthic Macroinvertebrate Community.................................................................................... 74 Taxa Richness and Dominance............................................................................................. 74 CONCLUSIONS AND RECOMMENDATIONS ................................................................. 104 REFERENCES ....................................................................................................................... 105 APPENDIX 3: ANALYTICAL SERVICES (PROJECT IV)................................................ 107 OBJECTIVES ......................................................................................................................... 108 METHODS AND MATERIALS............................................................................................ 108 Sampling Procedures........................................................................................................... 108 Analytical Procedures for Metals........................................................................................ 109 Analytical Procedures for Organics .................................................................................... 110 RESULTS AND DISCUSSION............................................................................................. 111 Metals in Sediment.............................................................................................................. 111 Toxicity Experiment Sediments.......................................................................................... 116 Metals in Clams .................................................................................................................. 117 POLYCHLORINATED BIPHENYLS AND POLYCYCLIC AROMATIC HYDROCARBONS ............................................................................................................... 122 PCB’s in Sediment.............................................................................................................. 122 PCB’s in Clams ................................................................................................................... 126 PAH’s in Sediment ............................................................................................................. 130 PAH’s in Clams .................................................................................................................. 134 CONCLUSIONS FROM ACUTE TOXICITY STUDIES......................................................... 139 INTRODUCTION .................................................................................................................. 139 Water Quality...................................................................................................................... 139 Sediment Toxicity Test ....................................................................................................... 139 Investigating Potential Metal Toxicity................................................................................ 141 Investigating Potential Organic Contaminant Toxicity...................................................... 145 YEAR 25 SUMMARY ........................................................................................................... 146 RECOMMEDATIONS........................................................................................................... 147 REFERENCES ....................................................................................................................... 147 III LIST OF FIGURES Figure 1. Year 24 Hart-Miller Island Monitoring Locations. ........................................................ 3 Figure 2. Year 25 concentration of metals at HMI relative to
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