Far Field Water Quality Monitoring (Resuspension)
Phase 1 Dredging Monitoring Schedule
Routine Monitoring is performed during typical operations, and Contingency Monitoring is performed when the Control Levels are exceeded.
| Sampling Frequency | Rogers Island | Thompson Island | Schuylerville (Lock 5) | Stillwater | Waterford | Albany | Poughkeepsie |
|---|---|---|---|---|---|---|---|
| Routine | Weekly | Daily | Daily | Weekly | Daily | Monthly | Monthly |
| Contingency | Daily | Twice Daily | Twice Daily | - | - | Weekly | Weekly |
Baseline Monitoring Schedule
| Sampling Frequency | Rogers Island | Thompson Island | Schuylerville (Lock 5) | Stillwater | Waterford | Albany | Poughkeepsie |
|---|---|---|---|---|---|---|---|
| Baseline | Monthly | Weekly | Weekly | - | Weekly | Monthly | Monthly |
Weekly Calendar (Please click on data for more information)
Dredging occurred between May 15 - Oct 26, 2009. Performance standard monitoring data was collected daily between May-Dec 2009. Once all Phase 1 river activities were completed, and baseline (pre-dredging) water PCB levels were reached, weekly monitoring began (December 28, 2009). Baseline monitoring results are received in accordance with standard lab turnaround time (approx. 21 days).
| Rogers Island | Thompson Island | Thompson Island (additional results) | Schuylerville (Lock 5) | Schuylerville (Lock 5) (additional results) | Stillwater | Waterford | Albany | Poughkeepsie | |
|---|---|---|---|---|---|---|---|---|---|
| Jul 25 | - | - | - | - | - | - | - | - | - |
| Jul 26 | - | Data Pending | - | Data Pending | - | - | Data Pending | - | - |
| Jul 27 | - | - | - | - | - | - | - | - | - |
| Jul 28 | - | - | - | - | - | - | - | - | - |
| Jul 29 | - | - | - | - | - | - | - | - | - |
| Jul 30 | - | - | - | - | - | - | - | - | - |
| Jul 31 | - | - | - | - | - | - | - | - | - |
Engineering Performance Standards: Resuspension
Strict Engineering Performance Standards have been developed to minimize resuspension of PCBs during dredging to limit the transport of PCBs and protect water intakes.
What is the Standard?
The performance standard for dredging resuspension sets a resuspension level of 500 parts per trillion (ppt) Total PCBs – the EPA drinking water standard under the Safe Drinking Water Act.
How is the Standard Measured?
Through an extensive river water quality monitoring program at upstream, “near-field” and “far-field” stations.
- near-field: within 300 meters downstream of dredge (turbidity, total suspended solids and metals)
- far-field: greater than 1 mile downstream (total suspended solids, metals and PCBs)
(see Far Field Water Monitoring Locations map at left)
