Washington State Department of Ecology Environmental Assessment Program Marine Sediment Monitoring Team Maggie Dutch, Sandra Weakland Valerie Partridge,

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Presentation transcript:

Washington State Department of Ecology Environmental Assessment Program Marine Sediment Monitoring Team Maggie Dutch, Sandra Weakland Valerie Partridge, Kathy Welch, Ed Long

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

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

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

5 PSAMP Strata: Urban Urban Harbor Harbor Rural Rural Passage Passage Basin Basin

existing PSAMP sediment data (n=441 sta) m 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)

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

significantly different

not significantly differentsignificantly different

Not significantly different significantly different

Not significantly different significantly different

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

Adopt probabilistic design for 0-2m MLLW to: characterize sed qual (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

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?

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?

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

TypeNatural featuresAnthropogenic features Harbor  semi-enclosed embayments, terminal inlets - head of bay/estuary  shallow  maritime  adjacent to urban/industrial centers  high numbers of point/nonpoint discharge  frequently dredged  presence of docks, breakwaters, jetties Urban  semi-enclosed embayments, sometimes head of bay/estuary, includes outer harbors  shallow to mid-depth  adjacent to urban/industrial centers  lower numbers of point/nonpoint discharge  may or may not be dredged Basin  deep  associated with a sill  may/may not be adjacent to urban/ industrial centers  lowest numbers of point and/or nonpoint discharge Passage  bounded by two shorelines and open at both ends  deep  not associated with a sill  not adjacent to urban/industrial centers  lowest numbers of point and/or nonpoint discharge Rural  includes semi-enclosed embayment, terminal inlets, as well as larger inlets  shallow to deep  not adjacent to urban/industrial centers or maritime activity; adjacent land largely undeveloped  lightly populated  lowest numbers of point and/or nonpoint discharges  frequently used as reference locations 5 PSAMP Strata