Ditch B Surface Water Ongoing Testing Results

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 January 22 and January 27, 2021 to help inform the location and design of the Groundwater Extraction & Treatment System (GETS) for PFAS in groundwater and surface water.

The data below 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 and posted on a regular basis for as long as conditions allow.

Location SW-L06 (upstream) SW-039 (downstream)
Compound (ng/L) PFOA PFOS PFOA PFOS
Criteria (ng/L) 420 11 420 11
10/7/20 1,400 D 300 36 2.2
10/21/20 630 D 100 130 [130] 19 [20]
11/4/20 2,000 D 150 370 D 16
11/20/20 2,100 D 160 830 D [740 D] 51 [53]
12/14/20 2,600 D 160 710 D 41
12/28/20 2,400 170 670 D [710 D] 33 [42]
1/22/21 2400 160 6.8 0.57
1/27/21 2100 180 Not detected Not detected

 

Notes:
WDNR Permit Criteria = PFOA: 420 ng/L; PFOS: 11ng/L