Urban Waters Sediment and Groundwater Seep Data (Data summarized by - - PowerPoint PPT Presentation

Urban Waters Sediment and Groundwater Seep Data

(Data summarized by Brandee Era-Miller, Environmental Assessment Program, Toxics Studies Unit)

• Samples collected by Ecology Urban Waters Program staff in late August 2013
• Analyzed for PCB Congeners (1668C) and PBDEs (1614) by Pacific Rim Lab
• Only totals for PCB congeners presented here
• Small data set:

○ Sediments at 8 locations ○ Groundwater seeps at 2 locations

• Data QA/QC review by Karin Feddersen of MEL and Brandee Era-Miller
• PCB congeners censored as not detected using 3x blank rule (conc. < 3x blank)
• NJ qualified data were not used for calculating totals
• Project Data to be entered into Ecology’s EIM database in late 2015 under

EIM Study ID: SRUW-Spokane.

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Sediment - PCBs

Normalized to Organic Carbon WA State Sediment Management Standards for Freshwater Sediments Sediment Cleanup Objective = 110 ug/Kg Total PCBs (Aroclors)

20 40 60 80 100 120

Total PCB s ug/Kg

1000 2000 3000 4000 5000 6000 7000

Total PCB ug/Kg OC

Normalizing PCBs to organic carbon shows that the pattern of higher PCBs at PostTerm2 is real. Normalizing PCBs to percent fines (silt + clay) did not change this pattern either. Total Aroclors Total congeners

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Groundwater Seep - PCBs

10 20 30 40 50 60 70 80 90 100 DamGW-13 WaterGW-10 Trip Blank

Total PCBs pg/L Monitoring Site

• Spokane Tribal Standards = 1.3 pg/L
• WA State WQ Standards = 170 pg/L
• Approximate sampling system noise

From 2014 Synoptic Survey = 30 pg/L

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Sediment - PBDEs

200 400 600 800 1000 1200

ng/Kg dw

BDE-47

200 400 600 800 1000 1200 1400 1600 1800 2000

BDE-99

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

BDE-209

• Concentrations of the most common/most often detected congeners: 47, 99 and 209 were

highest at the PostTerm2 site.

• Patterns did not change significantly with normalization to organic carbon or % fines.
• No State Standards exist for PBDEs in surface water, sediment, or fish tissue though there is a

fish tissue consumption advisory for PBDEs and PCBs in the Spokane River.

• A closer look at congener patterns in this data set would be of value. For example, BDE-209

is much higher at PostTerm2 compared to other congeners at other sites, potentially indicating a different source at this location.

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Groundwater Seep - PBDEs

• Congeners 47, 99 and 209 were detected at

significant levels in the Laboratory Method Blank, so were censored as not detected (“U”) in the environmental samples.

• Similar to the PCB results, DamGW-13 has

a higher concentration of Total PBDEs relative to WaterGW-10 and the trip blank.

• It would be a useful exercise to follow-up on

congener patterns as different congeners were detected at each of the 2 Upriver Dam sampling locations and in the trip blank.

10 20 30 40 50 60 70 DamGW-13 WaterGW-10 Trip Blank

Total PBDEs pg/L Monitoring Site

• 015
• 171
• 183
• 203
• 206
• 207
• 208
• 196
• 203
• 207
• 208
• 015
• 017
• 183

PBDE congeners detected in the sample

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