The Lake Washington PCB/PBDE Study: Concentrations Measured in Stormwater and Other Major Pathways to the Lake Washington Watershed

Transcription

1 Western Washington University Western CEDAR Salish Sea Ecosystem Conference 214 Salish Sea Ecosystem Conference (Seattle, Wash.) May 1st, 1:3 PM - 3: PM The Lake Washington PCB/PBDE Study: Concentrations Measured in Stormwater and Other Major Pathways to the Lake Washington Watershed Jenee Colton King County (Wash.). Water and Land Resources Division, jenee.colton@kingcounty.gov Richard Jack King County (Wash.). Water and Land Resources Division Follow this and additional works at: Part of the Terrestrial and Aquatic Ecology Commons Colton, Jenee and Jack, Richard, "The Lake Washington PCB/PBDE Study: Concentrations Measured in Stormwater and Other Major Pathways to the Lake Washington Watershed" (214). Salish Sea Ecosystem Conference This Event is brought to you for free and open access by the Conferences and Events at Western CEDAR. It has been accepted for inclusion in Salish Sea Ecosystem Conference by an authorized administrator of Western CEDAR. For more information, please contact westerncedar@wwu.edu.

2 The Lake Washington PCB/PBDE Study: Concentrations Measured in Stormwater and Other Major Pathways to the Lake Washington Watershed Jenée Colton, Curtis DeGasperi, Richard Jack, and Carly Greyell Science and Technical Support Section King County Water and Land Resources Division Department of Natural Resources and Parks May 1, 214

3 Problem: Lake Washington Fish are Contaminated Lake Washington Fish Tissue Results PCB Concentrations in Freshwater Fish Across Washington State Modified from Ecology (21)

4 Lake Washington PCB/PBDE Loadings Study Objectives Estimate PCB and PBDE loadings to Lakes WA and Union, to Puget Sound Determine key pathways (CSO, stormwater, streams, air, rivers, bridge runoff) to Lakes Model response time from any total PCB load reduction What total PCB load reduction is needed to reach safe levels in Lake WA fish?

5 Lake WA Project Components Field study (Pathway sampling of PCB and PBDE congeners) Loadings estimates (PCBs & PBDEs) PCB modeling PCB load scenarios for Lake WA Findings and recommendations

6 Lake WA Advisory Panel Fred Bergdolt, WA Dept. of Transportation Betsy Cooper, King County Wastewater Treatment Division Jonathan Frodge, Seattle Public Utilities Jenny Gaus, City of Kirkland Joan Hardy, WA Dept. of Health Rachel McCrea, WA Dept. of Ecology Doug Navetski, King County Stormwater Management Andy Rheaume, City of Redmond Ronald Straka, City of Renton Heather Trim, People for Puget Sound/FutureWise Bruce Tiffany, King County Wastewater Treatment Division Patrick Yamashita, City of Mercer Island

7 FIELD STUDY Air deposition sampler

8 Field Study Sampled one year (211/212) 29 PCB and 9 PBDE congeners in CSOs (1 King County, 2 Seattle) Stormwater (storm and baseflow, 6 stns) Streams (storm and baseflow, 3 stns) Sammamish and Cedar Rivers (3 stns) I-9 Bridge runoff Atmospheric deposition (wet and dry, 2 stns) Lake Washington and Ship Canal inlet and outlet

9 Sampling Stations

10 Concentrations in Rivers Base and storm flows not specifically targeted 5 4 Cedar upstream Sammamish Cedar downstream Total PCBs pg/l Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar 3 Cedar upstream Sammamish Cedar Downstream Total PBDEs pg/l 2 1 U Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar

11 Concentrations in Tributaries 12 1 Thornton May Juanita 8 Total PCBs pg/l 4 2 Baseflow May Jun Jul Aug Sep Oct Nov Dec Jan Feb 25 2 Thornton May Juanita Total PBDEs pg/l Baseflow May Jun Jul Aug Sep Oct Nov Dec Jan Feb

12 Concentrations in Stormwater 5 Total PCBs pg/l Fremont I-9 Kirkland Madrona Mercer Island Renton Seward Park Baseflow 25 Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May PBDEs pg/l Fremont I-9 Kirkland Madrona Mercer Island Renton Seward Park Baseflow Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May

13 Concentrations in CSOs Total PCBs pg/l Dexter Seward Park Ballard 15/ Nov Dec Jan Feb Mar Apr Total PBDEs pg/l Dexter Seward Park Ballard 15/151 5 Nov Dec Jan Feb Mar Apr

14 Atmospheric Deposition Rates Units are ng/m 2 /day 12 Total PCB Deposition Rate ng/m2-day Beacon Hill Sand Point May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Total PBDEs Deposition Rate ng/m2-d Beacon Hill Sand Point May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar

15 Measured Water Concentrations CSO Stormwater Bridges Stormwater Seattle Stormwater All n=4 n=25 n=1 n=8 Streams Storms Stormwater Small Cities n=9 n=11 Ambient Stormwater CSOs Streams Baseflow n=3 Rivers n=16 2.x1 4 4.x1 4 6.x1 4 8.x x1 5 PCBs pg/l

16 Conclusions CSO concentrations highest, up to order of magnitude River concentrations lowest Seattle stormwater concentrations higher than smaller cities Use these data to estimate loadings to Lakes Washington and Union

17 Acknowledgements Funded by EPA King County Field Services Unit and Analytical Lab Staff Ecology: John Williamson WSDOT: Archie Allen City of Kirkland: Jenny Gaus City of Mercer Island: Patrick Yamashita City of Renton: Ron Straka City of Seattle: Jonathan Frodge, Laura Reed AXYS Analytical