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FEDERAL WAY S. 356 TH 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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Page 1: FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT AND EXPANSION Science Seminar – November 2, 2017 Kate Macneale, WLR Science Section

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

Page 2: FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT AND EXPANSION Science Seminar – November 2, 2017 Kate Macneale, WLR Science Section

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

Page 8: FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT AND EXPANSION Science Seminar – November 2, 2017 Kate Macneale, WLR Science Section

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

Page 9: FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT AND EXPANSION Science Seminar – November 2, 2017 Kate Macneale, WLR Science Section

Example: Storm #10 East bioretention facility

Inflow

outflow

Rain = 0.78 inches

Page 10: FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT AND EXPANSION Science Seminar – November 2, 2017 Kate Macneale, WLR Science Section

Example: Storm #10 East bioretention facility

Inflow = 12200 cubic ft

outflow = 8300 cubic ft

Rain = 0.78 inches

Page 11: FEDERAL WAY S. 356TH STREET PROJECT...FEDERAL WAY S. 356TH STREET PROJECT: EFFECTIVENESS OF RETROFIT AND EXPANSION Science Seminar – November 2, 2017 Kate Macneale, WLR Science Section

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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