Ditch B Surface Water Ongoing Testing Results

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 4, 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
11/4/20
SW-39
11/4/20
Compound Units Criteria    
PFOA ng/L 420 1400 D 36 630 D 130 [130] 2,000 370
PFOS ng/L 11 300 2.2 100 19 [20] 150 16

 

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