Yesterday we shared with WDNR the data below from surface water samples taken October 21, 2020. We are testing water quality and PFAS levels approximately 10 feet upstream (SW-L06) and downstream (SW-39) from the interim treatment system in Ditch B bi-monthly until the ditch freezes. We will post the results on a regular basis. The first round of results for samples taken October 7 and reported on November 2 are also listed below.
| Location Sample Date |
SW-L06 10/7/2020 |
SW-39 10/7/2020 |
SW-L06 10/21/2020 |
SW-39 10/21/2020 |
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| Compound | Units | Criteria | ||||
| PFOA | ng/L | 420 | 1400 D | 36 | 630 D | 130 [130] |
| PFOS | ng/L | 11 | 300 | 2.2 | 100 | 19 [20] |
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
