Additional Data Being Used to Design Permanent Source-Control System
Today we shared with WDNR and property owners the data from surface water samples taken along Ditch B on November 20, 2020 to help inform the location and design of a permanent source-control solution for PFAS. This data includes the regular testing of water quality and PFAS levels approximately 10 feet upstream (SW-L06) and downstream (SW-39) from the interim treatment system in Ditch B and will be collected for as long as conditions allow. We are posting the results from these locations on a regular basis.
| Location Sample Date |
SW-L06 10/7/20 |
SW-39 10/7/20 |
SW-L06 10/21/20 |
SW-39 10/21/20 |
SW-L06 11/04/20 |
SW-39 11/04/20 |
SW-L06 11/20/20 |
SW-39 11/20/20 |
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| Compound | Units | Criteria | ||||||||
| PFOA | ng/L | 420 | 1400 D | 36 | 630 D | 130 [130] | 2,000 | 370 | 2,100 | 830 |
| PFOS | ng/L | 11 | 300 | 2.2 | 100 | 19 [20] | 150 | 16 | 160 | 53 |
Notes:
Applicable SW Criteria (MI standards) = PFOA: 420 ng/L; PFOS: 11ng/L
Detections above applicable criteria are Bold
Duplicate analyses in brackets [ ]
ng/L = nanograms per liter
D = dilution required for sample analysis
PFOA = perfluorooctanoic acid
PFOS = Perfluorooctanesulfonic acid
