TABLE 3-2 Selected Hazardous Substances at 951 National Priorities List Sites: Number and Percentage of Sites and Documented Migration of Substances into Specific Media

Substance

ATSDR Priority Group

No.

%

Sites with Migration

Groundwater

Surface Water

Soil

Air

Food

Sediment

Metallic Elements

 

564

59

327

234

138

122

37

50

114

Lead

1

404

43

224

159

84

88

28

39

84

Chromium

1

329

35

142

93

55

48

12

15

46

Arsenic

1

262

28

36

92

46

54

16

19

50

Cadmium

1

232

24

112

72

49

45

18

21

44

Mercury

2

129

14

58

29

24

20

6

10

19

Nickel

1

126

13

55

30

24

15

3

8

21

Beryllium

1

21

2

9

2

3

1

0

0

3

Volatile Organic Compounds (VOCs)

 

518

54

268

236

88

81

71

31

58

Trichloroethylene

1

402

42

231

204

63

41

44

19

27

Benzene

1

323

34

139

115

41

27

29

9

24

Tetrachloroethylene

1

267

28

125

116

28

22

34

11

17

Toluene

2

256

27

101

78

26

29

26

6

20

Vinyl Chloride

1

187

20

87

80

16

14

18

7

9

Methylene Chloride

1

183

19

81

61

21

16

17

4

9

Chloroform

1

142

15

74

61

20

8

7

3

9

1,4-Dichlorobenzene

1

31

3

7

6

0

1

1

0

1

Polychlorinated Biphenyls (PCBs)

1

162

17

86

43

25

40

11

25

39



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