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Document Path: G:\Fort Gratiot Landfill\a_MXD_PDFs\ChemboxFigures_2020\Octob er2019GW_PfasResults_2020Update.mxd

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ON-SITE PFAS GROUNDWATER SAMPLING LOCATIONS AND RESULTSFORT GRATIOT LANDFILL

FIGURE 6

EGLEFT. GRATIOT LANDFILL,

FORT GRATIOT TOWNSHIP,MICHIGAN

Sanitary Sewer

@A? Monitoring Well (DEEP)

@A? Monitoring Well (SHALLOW)

ED PZ Wells

Leachate Breakout Trench

Contours

Fence

&< Gas Monitoring Probe

Leachate Collection Sump

Groundwater Collection Trench

Leachate Force Main

Site Boundary

1. Green monitoring well chem boxes and well symbols indicate DEEP monitoring wells.2. Blue monitoring well chem boxes and well symbols indicate SHALLOW monitoring wells

3. All results are reported innanograms per liter (ng/L) or partsper trillion (ppt)4. -Red Text and Yellow highlighting indicates that the concentrations exceedregulatory cleanup criteria

340

0 150 30075Feet

9/26/2018

PFOS 139

PFOA 84

PFAS (Total) 664.01

SP-2

5/8/2018

PFOS 140

PFOA 30

PFAS (Total) 500

SP-6

12/5/2018 4/25/2019

PFOS ND ND

PFOA ND ND

PFAS (Total) ND ND

MW-2

12/4/2018 4/25/2019

PFOS ND ND

PFOA ND ND

PFAS (Total) ND 3.60

MW-1 *(Abandoned)

12/4/2018 4/25/2019

PFOS ND ND

PFOA ND ND

PFAS (Total) ND ND

MW-4

12/5/2018 4/25/2019

PFOS ND ND

PFOA ND ND

PFAS (Total) ND 1.85

MW-5

12/5/2018 4/25/2019

PFOS ND ND

PFOA 5 1.96

PFAS (Total) 24 21.25

MW-8

12/5/2018 4/25/2019 10/2/2019

PFOS 6 2.72 7.19

PFOA 41 5.88 26

PFAS (Total) 70 22.48 49.88

MW-12

12/4/2018 4/25/2019 10/1/2019

PFOS ND ND 2.56

PFOA ND ND ND

PFAS (Total) ND ND 2.56

MW-18

12/4/2018 4/25/2019 10/3/2019

PFOS ND ND 2.76

PFOA ND ND ND

PFAS (Total) ND 17.07 2.76

MW-21

4/25/2019 10/2/2019

PFOS 63.5 100

PFOA 11.8 11.6

PFAS (Total) 152.27 160.85

MW-22

12/5/2018 4/25/2019 10/1/2019

PFOS ND 8.57 ND

PFOA 3 3.37 ND

PFBS 3,100 4,790 2,310

PFAS (Total) 3,141 4,845 2,325

MW-23

10/1/2019

PFOS 4.41

PFOA 2.45

PFAS (Total) 18.19

MW-26

12/5/2018 4/25/2019 11/25/2019

PFOS 340 386.0 164.0

PFOA 30 35.9 29.2

PFAS (Total) 382 447.16 261.69

MW-14/14R