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Nearshore Sediment Monitoring Analysis: 1997-2009 PSAMP/UWI Ambient Monitoring Data

Nearshore Sediment Monitoring Analysis: 1997-2009 PSAMP/UWI Ambient Monitoring Data. Washington State Department of Ecology Environmental Assessment Program Marine Sediment Monitoring Team Maggie Dutch, Sandra Weakland Valerie Partridge, Kathy Welch, Ed Long. Background.

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Nearshore Sediment Monitoring Analysis: 1997-2009 PSAMP/UWI Ambient Monitoring Data

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  1. Nearshore Sediment Monitoring Analysis:1997-2009 PSAMP/UWI Ambient Monitoring Data Washington State Department of Ecology Environmental Assessment Program Marine Sediment Monitoring Team Maggie Dutch, Sandra Weakland Valerie Partridge, Kathy Welch, Ed Long

  2. Background • Design a probabilistic nearshore sediment monitoring program similar to PSAMP • PSAMP sampling frame - >2m (~1fathom) MLLW • Nearshore defined as 0 - 30m MLLW • New nearshore program to sample sediments from 0 - 2m MLLW

  3. Objectives • Characterize nearshore sediment quality (chemical contaminants, other parameters) in and outside of Urban Growth Areas (UGAs) • Track changes in sediment quality over time in UGA and nonUGA

  4. Sampling Frame Development • GIS ARCVIEW layers: • PSAMP Sampling Frame - > 2m (1fathom) MLLW • Urban/Harbor vs. Passage/Rural/Basin (PSAMP) • UGA land • UGA vs. nonUGA - 1500m buffer (easy) • 0 – 2m and 2 -30m MLLW (in progress) • perpendicular lines from UGA through 2m, 30m boundaries (time, $$ commitment)

  5. Inside/outside 1500m UGA buffer:Central Puget Sound(2-30m MLLW)

  6. 5 PSAMP Strata: • Urban • Harbor • Rural • Passage • Basin

  7. Urban/Harbor vs Passage/Rural/BasinCentral Puget Sound (2-30m MLLW)

  8. Preliminary Data Analyses • existing PSAMP sediment data (n=441 sta) • 2 - 30m MLLW • Inside/outside 1500m UGA buffer • Urban/Harbor vs. Passage/Rural/Basin strata • Box Plots (summary stats, data distribution) • Kruskal-Wallis (nonparametric, between-groups comparisons)

  9. Parameters • Physical - Depth, % Fines, TOC • Chemical – mSQSq - all chem, metals, PAHs, no. of contaminant concentrations exceeding criteria for each station • Sediment Chemistry Index (SCI) • Sediment Quality Triad Index (SQTI) • Toxicity • Benthic Invertebrates

  10. Station Depth significantly different significantly different

  11. Station Depth significantly different significantly different

  12. Percent Fines (Silt+Clay) significantly different not significantly different

  13. Total Organic Carbon (%) significantly different significantly different Not significantly different

  14. mSQSq (39 chemicals) significantly different significantly different Not significantly different

  15. mSQSq (metals) significantly different significantly different

  16. mSQSq (PAHs) significantly different significantly different

  17. No. Contaminant Conc. > SQS significantly different significantly different

  18. Sediment Chemistry Index significantly different significantly different

  19. Sediment Quality Triad Index significantly different significantly different

  20. Conclusions • Physical/chemical variables significantly different between most UGA vs. nonUGA, U/H vs. P/R/B in 2-30m MLLW frame • Similarities due to higher contaminant concentrations in UGA-U/H overlap stations • 0 - 2m MLLW sampling frame ecologically important/sensitive, not quantitatively sampled

  21. Recommendations Adopt probabilistic design for 0-2m MLLW to: • characterize sedqual (including chemistry, toxicity, benthic invertebrates) and generate baseline data for UGA, nonUGA • track sediment quality changes over time • track Dashboard Indicators (SCI, SQTI) over time

  22. Additional Information

  23. Primary Questions • Do nearshore SQT measures (chem/tox/benthos) meet WA Sediment Management Standards and PSP Marine Sediment Quality Dashboard Indicator Targets? • Does nearshore sediment quality differ between UGA/nonUGA sampling frames? • Is nearshore sediment quality improving or deteriorating in UGA/nonUGA sampling frames over time?

  24. Further Questions • What can spatial patterns and gradients in nearshore sediment quality tell us about possible stormwater sources? • How does sediment quality in the nearshore compare with the PSAMP sediment values for regions, strata, and Puget Sound-wide? • Are nearshore sediment conditions significantly different from offshore?

  25. Next Steps • 0m-2m and 2m-30m MLLW (finish matching1f boundary to PSAMP 1f for full coverage) • UGA – draw perpendicular lines using UGA, topo, WRIA layers, tribe/military info, BPJ (time and $$ commitment) • Finish preliminary stats (cluster analyses, MDS, box plots, t-tests) • PSAMP QAPP addendum

  26. Inside/outside 1500m UGA bufferSan Juan Islands, Strait of Georgia

  27. Inside/outside 1500m UGA bufferEastern Strait of Juan de Fuca, Admiralty Inlet

  28. Inside/outside 1500m UGA bufferWhidbey Basin, Central Puget Sound

  29. Inside/outside 1500m UGA bufferHood Canal, South Puget Sound

  30. 5 PSAMP Strata

  31. Urban/Harbor vs Rural/Passage/BasinSan Juan Islands, Strait of Georgia

  32. Urban/Harbor vs Rural/Passage/BasinEastern Strait of Juan de Fuca, Admiralty Inlet

  33. Urban/Harbor vs Rural/Passage/BasinWhidbey Basin, Central Puget Sound

  34. Urban/Harbor vs Rural/Passage/BasinHood Canal, South Puget Sound

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