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Surface Water, Inter-Armor and Sub-Armor Sampling Program and Results

2009 McCormick & Baxter Annual Report. Surface Water, Inter-Armor and Sub-Armor Sampling Program and Results. Oregon DEQ, Hart Crowser, Inc., and GSI Water Solutions. Sampling Program. Goals:

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Surface Water, Inter-Armor and Sub-Armor Sampling Program and Results

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  1. 2009 McCormick & Baxter Annual Report Surface Water, Inter-Armor and Sub-Armor Sampling Program and Results Oregon DEQ, Hart Crowser, Inc., and GSI Water Solutions

  2. Sampling Program • Goals: • Monitor sediment cap (and groundwater) remedy to understand performance related to minimizing releases of contaminants from sediments that might result in contamination of the Willamette River in excess of federal and state ambient water quality criteria • Fluvial system characteristics (semi-annual monitoring) • Lower Willamette tidally-influenced • Transition-zone water may reflect variations in: • Discharge (Q, or cubic feet per second) • River stage (stream elevation) • Stream velocity (feet per second)

  3. Sampling Program 2009 • Conventional Sampling • Overlying Cap: • Surface water • Within Cap: • Inter-armor • Sub armor • SPME – Fall 2009

  4. Sampling Methodology • Semi-annual sampling locations • 24 surface water stations • 22 inter-armoring water and • 22 sub armoring water stations

  5. Seasonality of the River • Spring • Higher flow • Higher gradient • Fewer flow reversals • Fall • Less gradient • More reversals

  6. Seasonality of the River

  7. Sampling Results - SW • cPAHs in surface water • All below 0.031 µg/L sediment cap performance goal; with exception of Location 15 (Spring 2009) where low level CPAHs were detected in surface water but not detected in the inter-armoring or subarmoring samples • Spring is when River has higher turbidity and higher flow.

  8. Sampling Results - IA • cPAHs in inter-armoring water • All below 0.031 µg/L sediment cap performance goal

  9. Sampling Results - SA • cPAHs in sub-armoring water

  10. Sampling Results - SW • Naphthalene in surface water

  11. Sampling Results - IA • Naphthalene in inter-armor water

  12. Sampling Results - SA • Naphthalene in sub-armor water

  13. Sampling Results - trends • Mean Total cPAH Concentration Mean

  14. Sampling Results - trends • Mean Total PAHs in surface, inter- and sub-armor water

  15. Sampling Results – Location 10

  16. Sampling Results – Location 10 • Comparing to Portland Harbor Surface Water Metals Portland Harbor: Total Cu Portland Harbor: Total As

  17. Sampling Results – Location 10 • Trends since remedy – cPAHs, total PAHs

  18. Conclusions • COC concentrations in surface water and sub-armoring are generally below comparison criteria with the exception of arsenic (MDL) • Detections frequencies and concentrations increase with depth (highest in SA) • Concentrations are generally lower in spring events however, SW can be elevated in Spring with High River Discharge • cPAHsdecline since remedy: • Not detected in SW samples since Spring 2006 (with one exception at Location 15) • ND in IA samples since Fall 2006 • Concentrations trends stable to decreasing • Sediment cap is protective of surface water

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