An Update to EPA s Conceptual Site Model for the Lower Passaic River: An Examination of the Most Recent Results

Transcription

1 An Update to EPA s Conceptual Site Model for the ower Passaic River: An Examination of the Most Recent Results Edward A. arvey, Alice Yeh 2, Solomon bondo-tugbawa, Juliana Atmadja, John Kern 3, AmyMarie Accardi-Dey, Shane McDonald and Chitra Prabhu () The ouis erger roup: Morristown, NJ, Elmsford, NY & Exton, PA (2) US EPA-Region 2, NY, NY (3) Kern Statistical Services, Sauk Rapids, MN FOURTH PASSAIC RIVER SYMPOSIUM Passaic River Institute of Montclair State University June 22, 20 The ouis erger roup, Inc.

2 Outline Data, data, data! Some initial aspects of the CSM Hydrodynamic considerations Distribution of finer sediments Sediment stability Rate of recovery Current loads Conceptual Site Model Summary 2 The ouis erger roup, Inc.

3 Extensive Data Set Provides Multiple ines of Evidence for Development of a CSM Physical Setting athymetric surveys ( surveys in 9 years) Side scan sonar survey Salinity surveys and long-term mooring deployments Human Impacts Historical records of use and development Sediment Chemistry Nature-and-extent sediment surveys 995, , 2008 Water Chemistry Suspended sediment samples from tributaries, CSOs and SWOs Water column samples from main stem e-7 bearing sediment survey Dated sediment cores iota Data Fish Surveys Invertebrate Surveys The ouis erger roup, Inc. 3

4 CSM Components Coincidence of channel construction, lack of maintenance and historical discharges have created an unusually large inventory of contaminated sediments in the ower Passaic River. Sediment inventories coincide with areas of deposition, not proximity to source. Passaic River delivers significant load of contaminated sediments to Newark ay. Suspended sediments from Newark ay carry relatively little contamination back up into the Passaic. Dioxin signature uniquely identifies the ower Passaic River impacts on New York/New Jersey Harbor sediments 4 The ouis erger roup, Inc.

5 ow Flow 70ft 3 /s Tidal Intrusion Disperses Sediments and Contaminants over ower 2 Miles egend Fresh Water Variable Salinity Saline Water Salinity Mooring High Flow ~3,500 ft 3 /s Daily Excursion of Salt Front ~4 miles 5 The ouis erger roup, Inc.

6 Areas of Silt, Sand, ravel and Rock Vary by River Mile (Side Scan Sonar Survey Results) % 2% 4% % Silts represent the areas of greatest contamination 9% 4% 5% 9% 4% 82% Silt Silt and Sand 4% 2% 5% Sand ravel and Sand RM 0 RM 8 RM 8 RM 5 Rock and Coarse ravel The ouis erger roup, Inc. 6

7 Elevation Change : Depositional Interval The ouis erger roup, Inc.

8 Elevation Change : Erosional Interval The ouis erger roup, Inc.

9 Depositional, Erosional and Net Sediment Volumes 989 to 2007 Depositional, Erosional and Net Volume based on Integrated Comparison -Annual asis ,000 50,000 ross Deposition is 2 x Net Deposition ross Deposition is > x Net Deposition ross Deposition is 4 x Net Deposition 0,000 Volume (cy/yr) 50, ,000-0,000-50,000 ross Depositional ross Erosional Net -200,000 RM 0.5 to 2 RM 2 to 7 RM 0.5 to 7 RM 0.5 to 2 RM 2 to 7 SRM 0.5 to 7 The ouis erger roup, Inc.

10 Dated 2,3,7,8 Sediment - TCDD Cores (ug/kg) Document the History of Contaminant Release and the Prolonged Rate of Recovery for Dioxins 2,3,7,8 - TCDD (ug/kg) 0 2,3,7,8 - TCDD (ug/kg) RM osition 2007 Dioxin RM.4 RM 2.2 RM 7.8 RM 2,3,7,8 - TCDD (ug/kg) Non-contiguous core segment Approximate Year of Deposition Approximate Year of Deposition The ouis erger roup, Inc. RM.4 RM 2.2 RM RM RM 2.6 Non-contiguous core segment

11 2007 As Well as Many Other Contaminants 2005 RM.4 Approximate Year of Deposition 4-4' 4-4' - - DDE (ug/kg) (ug/kg) Non-contiguous 985 core segment RM.4 RM 2.2 RM 7.8 RM RM 2.6 DDE Approximate Year of Deposition Approximate Year of Deposition RM 2.2 RM 7.8 RM RM 2.6 Non-contiguous core segment 985 The ouis erger roup, Inc.

12 Sediment and Water Column Surveys Document the Current Impacts of the ower Passaic River 2,3,7,8-TCDD Concentration (ng/kg) 0,000,000, Head Of Tide 5 Trib ower Passaic Trib SWOs Trib CSOs 5 River Mile 0 Newark ay e-7 earing Samples Nature and & Extent -5 The ouis erger roup, Inc. - Ackerman Saddle Third River Second River CSOs SWOs Ackerman Saddle Third River Second River CSOs SWOs Ackerman Saddle Third River Second River SWOs

13 Sediment and Water Column Surveys Document the Current Impacts of the ower Passaic River,000 High Molecular Weight PAH (ug/g) Head Of Tide ower Passaic 5 River Mile 0 Newark ay st st Quar. Quar. Min Min Max Max 3rd 3rd Quar. Quar. st st Quar. Quar. Min Min Max Max 3rd 3rd Quar. Quar. Nature and & Extent 00 Trib 0 Trib SWOs Trib CSOs e-7 earing Samples st Quar. Min Max 3rd Quar. st Quar. Min Max 3rd Quar. - The ouis erger roup, Inc. st st Quar. Quar. st Quar. Min Min Max Max 3rd 3rd Quar. Quar. 3rd Quar. st st Quar. Quar. st Quar. Min Min Max Max Min Max Min Max 3rd 3rd Quar. Quar. 3rd Quar.

14 Revised Mass alance Results ~35% Upper Passaic >45% Resuspension >95% Resuspension Solids alance suggests external solids and resuspension contribute roughly equally to recently deposited sediment The ouis erger roup, Inc. 4

15 5 Conceptual Site Model of the ower Passaic River Dynamic Sediment ed is documented by statistical analysis of multiple bathymetric surveys Hydrodynamic reworking of the surface sediments maintains surface contamination, especially in RM 2 to 2, 25 year half life is observed for nearly all contaminants post 980. Mass balance shows resuspension to be the dominant source of contamination to recently deposited sediments preventing substantive recovery Control of sediment and resuspension is critical to the recovery of the river The ouis erger roup, Inc.

16 Questions??? USEPA USACE NJDOT USFWS NJDEP NOAA 6 The ouis erger roup, Inc.