|
2.1.1 Narrative
Contractors are excavating contaminated sediments and bank soils in BRSA 1.
2.1.2 Response Actions to Date
The following activities took place during the reporting period:
- Excavation of contaminated soils with confirmation sampling results received from 12 grids in BRSA 1 (see table below for results). There are approximately 40 total grids in BRSA 1, with each grid consisting of approximately 50 lineal feet of riverbank. The target clean-up goal in the riverbank soils is 5 mg/kg total PCBs.
|
BRSA
1
GRID
|
TOTAL
ESTIMATED EXCAVATION DEPTH (in)
|
FINAL
CONFIRMATION TOTAL PCBs RESULT (mg/kg)
|
|
1
|
48
|
3.10
|
|
2
|
14
|
2.30
|
|
3
|
30
|
0.17
|
|
4
|
13
|
0.18
|
|
5
|
16
|
ND
|
|
6
|
21
|
0.49
|
|
7
|
21
|
0.34
|
|
8
|
12
|
0.51
|
|
9
|
13
|
0.14
|
|
10
|
12
|
0.24
|
|
11
|
8
|
0.064
|
|
12
|
11
|
0.032
|
ND = non-detect
Note: Confirmatory sampling takes place immediately
following excavation of contaminated soils in accordance with procedures
outlined in the 'Field Sampling Plan' and the 'Technical Memorandum' for BRSA 1. Both documents can be found in the ‘Documents' Section of the
project website.
- Staging of approximately 600 cubic yards of excavated soils for transport/disposal;
- Treatment of contact water from contaminated grids in the on site WWTP. Approximately 62,500 gallons were treated during the reporting period. Sampling results were received confirming non-detect levels for Total PCBs in treated water.
- Daily particulate monitoring (PM10) around the perimeter of BRSA 1 with no detections off site of particulates above the action level of 1.5 mg/m3;
- Turbidity control measures and monitoring in Kalamazoo River around the BRSA 1 excavation area (1 upstream monitor and 2 downstream monitors) with no sustained exceedance of the action level of 50 NTUs above upstream levels; and
- Mussel survey/relocation efforts were completed on September 23 in BRSAs 1 - 4. A total of 670 live mussels (see photograph) were collected representing 8 species. All mussels were measured, tagged, and relocated to suitable habitat upstream of the M-89 bridge. Mussel survey/relocation efforts are underway in BRSAs 5 & 6.
A detailed summary of activities is included in the 'September 2016 Monthly Progress Report' which can be found in the 'Documents' section of the project website.
2.1.3 Enforcement Activities, Identity of Potentially Responsible Parties (PRPs)
See PolRep #1
2.1.4 Progress Metrics
The following materials were managed during the reporting period.
| Waste Stream |
Medium |
Quantity |
Manifest # |
Treatment |
Disposal |
| Cardboard |
solid |
50 lbs |
NA |
recycling |
Otsego Recycling Center
|
| Plastic |
solid |
20 lbs |
NA |
recycling |
Otsego Recycling Center |
| Contaminated soil (< 50 ppm PCBs) |
solid |
none shipped to date |
|
disposal |
Republic Ottawa County Farms Landfill, Coopersville, MI |
| Contact water |
liquid |
62,500 gal |
NA |
on-site WWTP |
On-site reuse/discharge to Kalamazoo River |
|
