Element

Soil Layers

Soil 1

Soil 2

Soil 3

Natural Background Concentration^a

Pb

0 - 15

8.36

10.31

10.02

10.1 ± 0.2

15 - 30

16.46

16.07

16.98

10.4 ± 0.6

30 - 45

17.96

15.50

26.19

11.7 ± 0.3

Ni

0 - 15

48.85

67.50

45.01

14.7 ± 1.1

15 - 30

17.01

20.36

17.59

13.4 ± 1.4

30 - 45

14.14

16.38

14.96

10.2 ± 1.2

Fe

0 - 15

2.05

1.90

1.50

232.7 ± 8.4

15 - 30

1.74

1.68

1.47

211.2 ± 8.9

30 - 45

1.38

1.65

1.41

180.2 ± 9.7

Cu

0 - 15

2.56

3.05

2.70

131.1 ± 6.3

15 - 30

2.31

2.52

2.40

124.6 ± 4.0

30 - 45

1.68

1.63

1.36

120.1 ± 4.4

Cr

0 - 15

8.05

8.59

7.43

9.3 ± 0.4

15 - 30

8.31

8.35

6.77

7.1 ± 0.4

30 - 45

19.01

15.00

14.54

3.2 ± 0.2

Cd

0 - 15

29.68

30.64

26.18

2.2 ± 0.2

15 - 30

44.82

48.91

43.18

1.1 ± 0.1

30 - 45

53.57

64.71

56.71

0.7 ± 0.2

Zn

0 - 15

2.64

3.07

2.20

68.2 ± 4.3

15 - 30

2.63

2.80

2.28

77.5 ± 4.7

30 - 45

2.82

3.14

2.63

82.3 ± 5.3

PLI

0 - 15

5.41

6.13

5.00

15 - 30

5.92

6.29

5.54

30 - 45

6.32

6.43

6.26