FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT...
Transcript of FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT...
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FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT AND EXPANSION
Science Seminar – November 2, 2017
Kate Macneale, WLR Science Section
Funded by Stormwater Action Monitoring Program
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BMPs: Slow down and treat stormwater runoff
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S. 356th Street Detention Facility
Built 1997 to treat runoff from 189-acre basin combined detention and
stormwater treatment wetland (“wetland”)
Expanded in 2014 In-series “wetland” to increase
treatment 2 new bioretention facilities to
treat runoff from 22-acre basin that hadn’t been treated previously
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New “wetland”
Increase capacity Unlined, but
infiltration limited
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Bioretentionfacilities
New capacity Underdrained
East: drains quickly West: drains slowly
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Untreated In
East bioretention West bioretention Wetland complex
Treated Out
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Why We Care
Receiving waters:North Fork West Hylebos Creek
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Sampling Complete
Flow at 7 locations 18 storms sampled for TSS,
metals, nutrients, PAHs 10 storms for PCBs, fecal
coliforms 5 storms for toxicity Pre- and post-retrofit
turbidity data
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Example: Storm #10 East bioretention facility
Inflow
outflow
Rain = 0.78 inches
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Example: Storm #10 East bioretention facility
Inflow = 12200 cubic ft
outflow = 8300 cubic ft
Rain = 0.78 inches
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Example: Storm #10 East bioretention facility
Inflow = 12200 cubic ft
outflow = 8300 cubic ft
Rain = 0.78 inches
reduced peak flows
attenuated flows
infiltration
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Treatment?
Untreated In
Treated Out
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east west
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east west
wetlands
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east west wetlands
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east west wetlands
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ZincTSSPAHsHardnessDOCToxicity
Bioretention facilities
Bacteria NutrientsCopperLead
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Take home messages
Bioretention facilities provided flow control and treatment sources of nutrients, some metals short retention times (east bioretention) sufficient for
treatment
Wetland complex Still analyzing net and relative effect
Final report completed by end of 2018
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Federal Way – Fei Tang and Theresa Thurlow King County Environmental Lab Toxicology and Contaminant Assessment Team RSMP/SAM Program
Acknowledgements
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