The Connecticut Department of Energy & Environmental Protection (DEEP) has just released October update for the cleanup of lead impacted sediment by hydraulic dredging in the Mill River.
CT DEEP, together with the contractor TRC, is currently dredging, dewatering the sediment, treating the filtrate water from the dewatering process and discharging treated water back to the Mill River.
All of the sediment dewatering and water treatment work is occurring at the facility on Exide’s property in Fairfield.
The following activities have or will be conducted in October:
- Relocation of the dredge, turbidity curtains and turbidity monitors from Area II to Area IV. Placing the dredge into Area IV (occurred on October 6th). Moving the second dredge in Area III to the middle of Area III to assist in dredging activities in Area IV.
- Dredging began in Area IV on October 7th.
- The turbidity meters (yellow buoys with solar panels), turbidity curtains (floating yellow items), and the large orange pipeline that conveys sediment to the Exide property will be moved as dredging progresses in Area IV.
- Area IV is the last of the five Areas to be dredged.
- Dewatering of sediment and treatment of filtrate will continue at Exide’s property.
- Monitoring and sampling will continue, as required by CT DEEP.
- Collecting final sediment verification samples after dredging is completed. The results will be used to evaluate sediment remediation activities in the five Areas against the approved clean‐up criteria.
- Upon CT DEEP approval of the final verification sample results, TRC will commence demobilizing marine equipment from the Site.