Phase 1 Certification Units (Rogers Island Area)
Phase 1 Certification Units (Griffin Island Area)
Residuals / Activities Update
Goal of the Standard
The residual standard is designed to detect and manage small amounts of contaminated sediments that may remain on the river bottom after dredging.
How the Standard Works
- Identification of “Certification Units” of approximately 5 acres in size (see maps).
- Collection of 40 sediment cores from within a certification unit after dredging and analyzing them for PCB concentrations.
Possible Actions
- Lower concentrations might call for backfilling, where appropriate.
- Higher concentrations would call for actions such as redredging or constructing a cap.
See right and below for maps of the Phase 1 certification units and for certification unit status and activities.
| Certification Unit | Status / Activity |
|---|---|
| Unit 1 | No Activity |
| Unit 2 | No Activity |
| Unit 3 | No Activity |
| Unit 4 | No Activity |
| Unit 5 | No Activity |
| Unit 6 | No Activity |
| Unit 7 | No Activity |
| Unit 8 | No Activity |
| Unit 9 | No Activity |
| Unit 10 | No Activity |
| Unit 11 | No Activity |
| Unit 12 | No Activity |
| Unit 13 | No Activity |
| Unit 14 | No Activity |
| Unit 15 | No Activity |
| Unit 16 | No Activity |
| Unit 17 | No Activity |
| Unit 18 | No Activity |
