Lower Duwamish Waterway Source Control: Green River Watershed Suspended Solids Data Report
Appendix F Spatial Deptions of Additional Metals
King County Science and Technical Support Section December 2016 Appendix F Of the metals analyzed in the suspended solids samples for this study, only arsenic was highlighted in the report, because it is the only metal that is a human health contaminant of concern for the Lower Duwamish Waterway (LDW). This appendix provides figures to spatially depict the results for the additional metals for both the baffle sediment trap samples and the filtered solids samples. When available, suspended sediment concentrations are compared to the sediment cleanup goals established in the LDW Record of Decision (EPA 2014). These include the point-based benthic cleanup goals for LDW contaminants of concern (Table F-1). Arsenic is the only metal with a site- wide human health cleanup goal, and so this is not included in this appendix. Comparing chemical concentrations in suspended solids to these cleanup goals is meant only as a reference point. These cleanup goals apply to bedded sediment in the LDW at various spatial scales. Suspended solids do not match the potential exposure duration or pathways of bedded sediment. Sediment concentrations in the areas where the suspended solids settle will be impacted by a variety of physical processes, including mixing with current bed sediment and varied suspension times. Cleanup goals are included in the figure if suspended solids concentrations were higher than the cleanup goal.
Cadmium Chromium Copper Lead Nickel Silver Vanadium Zinc Mercury Point-based Benthic 5.1 260 390 450 NA 6.1 NA 410 0.41 Cleanup Goal
Baffle Sediment Traps 3.0 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 2.5 Period 2 (Spring) Period 3 (Summer) 2.0 Period 5 (Summer)
1.5
1.0 Cadmium (mg/kg dry weight) 0.5
0.0 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
December 2016 F-2 Appendix F: Green River Suspended Solids Report Figure F-1. Cadmium Concentrations in Baffle Sediment Trap Samples by Site and Period.
45 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 40 Period 2 (Spring) Period 3 (Summer) 35 Period 5 (Summer)
30
25
20
15
10 Chromium (mg/kg dry weight) 5
0 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-2. Chromium Concentrations in Baffle Sediment Trap Samples by Site and Period.
60 Period 1 (Fall/Winter) Period 4 (Fall/Winter) Period 2 (Spring) 50 Period 3 (Summer) Period 5 (Summer)
40
30
20 Copper (mg/kg (mg/kg Copper dry weight)
10
0 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-3. Copper Concentrations in Baffle Sediment Trap Samples by Site and Period.
December 2016 F-3 Appendix F: Green River Suspended Solids Report 50 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 45 Period 2 (Spring) 40 Period 3 (Summer) Period 5 (Summer) 35
30
25
20
Lead (mg/kg dry weight) 15
10
5
0 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-4. Lead Concentrations in Baffle Sediment Trap Samples by Site and Period.
50 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 45 Period 2 (Spring) 40 Period 3 (Summer) Period 5 (Summer) 35
30
25
20
15 Nickel (mg/kg dry weight)
10
5
0 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-5. Nickel Concentrations in Baffle Sediment Trap Samples by Site and Period.
December 2016 F-4 Appendix F: Green River Suspended Solids Report 0.30 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 0.25 Period 2 (Spring) Period 3 (Summer) Period 5 (Summer) 0.20
0.15
0.10 Silver (mg/kg dry weight)
0.05
0.00 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-6. Silver Concentrations in Baffle Sediment Trap Samples by Site and Period.
80 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 70 Period 2 (Spring) Period 3 (Summer) Period 5 (Summer) 60
50
40
30
20 Vanadium (mg/kgVanadium dry weight) 10
0 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-7. Vanadium Concentrations in Baffle Sediment Trap Samples by Site and Period.
December 2016 F-5 Appendix F: Green River Suspended Solids Report 600 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 500 Period 2 (Spring) Period 3 (Summer) Period 5 (Summer) 400 LDW Benthic Cleanup Goal
300
200 Zinc (mg/kg dry weight)
100
0 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-8. Zinc Concentrations in Baffle Sediment Trap Samples by Site and Period Compared to the LDW Benthic Cleanup Goal.
0.18 Period 1 (Fall/Winter) Period 4 (Fall/Winter) 0.16 Period 2 (Spring) Period 3 (Summer) 0.14 Period 5 (Summer)
0.12
0.10
0.08
0.06
Mercury (mg/kg dry weight) 0.04
0.02
0.00 Green River - Newaukum Soos Creek Mill Creek Springbrook Green River - Flaming Geyser Creek Creek Foster Links
Figure F-9. Mercury Concentrations in Baffle Sediment Trap Samples by Site and Period.
December 2016 F-6 Appendix F: Green River Suspended Solids Report Filtered Solids
10 Baseflow 9 Storm Events Springbrook Creek Storm Event 8 Storm Event Average 7 LDW Benthic Cleanup Goal
6
5
4
3
Cadmium (mg/kg dry weight) 2
1
0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-10. Cadmium Concentrations in Filtered Solids Samples by Location Compared to the LDW Benthic Cleanup Goal.
80 Baseflow 70 Storm Events Springbrook Creek Storm Event 60 Storm Event Average
50
40
30
20 Chromium (mg/kg dry weight) 10
0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-11. Chromium Concentrations in Filtered Solids Samples by Location.
December 2016 F-7 Appendix F: Green River Suspended Solids Report 120 Baseflow Storm Events 100 Springbrook Creek Storm Event Storm Event Average 80
60
40 Copper (mg/kg (mg/kg Copper dry weight) 20
0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-12. Copper Concentrations in Filtered Solids Samples by Location.
100 Baseflow 90 Storm Events
80 Springbrook Creek Storm Event Storm Event Average 70
60
50
40
30 Lead (mg/kg dry weight) 20
10
0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-13. Lead Concentrations in Filtered Solids Samples by Location.
December 2016 F-8 Appendix F: Green River Suspended Solids Report 50 Baseflow 45 Storm Events 40 Springbrook Creek Storm Event Storm Event Average 35
30
25
20
15 Nickel (mg/kg dry weight) 10
5
0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-14. Nickel Concentrations in Filtered Solids Samples by Location.
0.7 Baseflow Storm Events 0.6 Springbrook Creek Storm Event Storm Event Average 0.5
0.4
0.3
0.2 Silver (mg/kg dry weight)
0.1
0.0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-15. Silver Concentrations in Filtered Solids Samples by Location.
December 2016 F-9 Appendix F: Green River Suspended Solids Report 140 Baseflow Storm Events 120 Springbrook Creek Storm Event Storm Event Average 100
80
60
40 Vanadium (mg/kgVanadium dry weight) 20
0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-16. Vanadium Concentrations in Filtered Solids Samples by Location.
900 Baseflow 800 Storm Events Springbrook Creek Storm Event 700 Storm Event Average LDW Benthic Cleanup Goal 600
500
400
300 Zinc (mg/kg dry weight) 200
100
0 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-17. Zinc Concentrations in Filtered Solids Samples by Location.
December 2016 F-10 Appendix F: Green River Suspended Solids Report 0.30 Baseflow Storm Events 0.25 Springbrook Creek Storm Event Storm Event Average 0.20
0.15
0.10 Mercury (mg/kg dry weight) 0.05
0.00 Green River - Newaukum Soos Creek Mill Creek Black River/ Green River - Flaming Geyser Creek Springbrook Foster Links Creek
Figure F-18. Mercury Concentrations in Filtered Solids Samples by Location.
December 2016 F-11 Appendix F: Green River Suspended Solids Report