Oyster shell retrofits in catch basins

King County evaluates the effectiveness of stormwater treatment by oyster shell. This study compares water quality in two groups of catch basins in the City of Mercer Island — one with crushed oyster shell retrofit and the other without them. Visit King County's project webpage for detailed information.

Study questions

Does oyster shell provide treatment for dissolved metals?
Can catch basins with oyster shell retrofits reduce stormwater pollutants significantly more than catch basins without oyster shell?

Study findings

The study will continue until April 2022.

Project tasks and key deliverables

Contract IAA &Scope of Work

Contract IAA & Scope of Work Amendment

Project management
- Semi-annual reports
Planning and Quality Assurance Project Plan
- Final QAPP
- Equipment purchase
Field sampling and analysis
- Preliminary Flow data 1, Flow data 2 (Storms#1-4)
- Analytical data (Field blank), Analytical data (Storm #1-4 & Blank)
Final report
Communication of findings
- Presentation
- Fact sheet

Contact information

Keunyea Song
Stormwater Action Monitoring Scientist
keunyea.song@ecy.wa.gov
360-407-6158

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Oyster shell retrofits in catch basins

Study questions

Study findings

Project tasks and key deliverables

Related links

Contact information