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Source Control in the Duwamish Waterway Seattle Public Utilities October 30, 2009

Source Control in the Duwamish Waterway Seattle Public Utilities October 30, 2009. Today’s Presentation. Business Inspections Source tracing/characterization Compare Lower Duwamish Waterway site with East Waterway site source tracing results. Lower Duwamish Waterway Site. Storm drain basin :

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Source Control in the Duwamish Waterway Seattle Public Utilities October 30, 2009

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  1. Source Control in the Duwamish WaterwaySeattle Public UtilitiesOctober 30, 2009

  2. Today’s Presentation • Business Inspections • Source tracing/characterization • Compare Lower Duwamish Waterway site with East Waterway site source tracing results

  3. Lower Duwamish Waterway Site Storm drain basin: 8,900 acres 240 outfalls

  4. Lower Duwamish Waterway Site Storm Drain Basin

  5. Lower Duwamish Waterway Site Storm drain basin: 8,900 acres 240 outfalls Combined sewer service area: 20,000 acres 10 outfalls

  6. Lower Duwamish Waterway Site

  7. Lower Duwamish Waterway Site Storm drain basin: 8,900 acres 240 outfalls Combined sewer service area: 20,000 acres 10 outfalls

  8. Lower Duwamish and East Waterway Sites LDW Storm drain basin: 8,900 acres 240 outfalls Combined sewer service area: 20,000 acres 10 outfalls EW Storm drain basin: 805 acres 35 outfalls

  9. Lower Duwamish and East Waterway Sites LDW Storm drain basin: 8,900 acres 240 outfalls Combined sewer service area: 20,000 acres 10 outfalls EW Storm drain basin: 805 acres 35 outfalls Combined sewer service area: 4,800 acres 3 outfalls

  10. Lower Duwamish and East Waterway Sites Storm Drain Basin

  11. SPU Business Inspections • Stormwater • Industrial waste • Hazardous waste • Spill prevention and control 2003-2009: LDW: 2,280 inspections EW: 720 inspections

  12. Corrective Actions

  13. SPU Source Tracing • Sediment traps • Inline grabs • Catch basins • Onsite at businesses • Public right-of-way (ROW)

  14. Source Samples LDW (596): • 123 Onsite catch basins • 137 ROW catch basins • 158 inline grabs • 178 traps EW (95): • 46 Onsite catch basins • 23 ROW catch basins • 10 Inline grabs • 16 sediment traps

  15. PCBs LDW EW >100,000 PCBs (ug/kg dw)

  16. PCBs--LDW

  17. PCBs--LDW

  18. PCBs--EW

  19. BEHP LDW Frequency EW Frequency BEHP (ug/kg dw)

  20. BEHP: LDW

  21. BEHP--EW

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