Oyster shell retrofits in catch basins

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

Initial data gathering showed no treatment effect by oyster shell retrofit in catchbasins. This is likely due to limited contact time and oystershell amount to treat high volume of stormwater discharge from large contributing basins in the study area.

While we originally planned for the study to end April 2022, this will now happen March 2021. We expect the final study report November 2020.

Project tasks and key deliverables

1. Project management 
   • Semi-annual reports
     • Report 1 (2018 Q3/Q4)
     • Report 2 (2019 Q1/Q2)
     • Report 3 (2019 Q3/Q4)
     • Report 4 (2020 Q1/Q2)
2. Planning and Quality Assurance Project Plan 
   • Final QAPP
   • Equipment purchase
3. Field sampling and analysis
   • Preliminary Flow data 1, Flow data 2 (Storms#1-4)
   • Analytical data (Field blank), Analytical data (Storm #1-4 & Blank)
4. Final report 
5. Communication of findings 
   • Presentation 
   • Fact sheet