Environmental Engineering Reference
In-Depth Information
TABLE 10.12
Comparison of CRF
SOIL
to CRF
GW
Groundwater
Contaminant
Risk Factor
a
(CRF
GW
)
Groundwater/
Soil Contaminant
Risk Factor Ratio
CRF
GW
/CRF
SOIL
Soil Contaminant
Soil Risk Factor
(CRF
SOIL
)
Average Extent of
Contamination
from Source (m)
Contaminant
Type
Geological
Unit
DNAPL
b
Clay
333
3,408
0.09
30
SC
c
773
1,116
0.69
42
SSC
d
1,091
1,073
1.01
50
Sand
1,419
965
1.47
1,012
Moraine
1,274
982
1.30
625
LNAPL
b
Clay
0.08
30.17
0.002
38
SC
0.42
4.37
0.09
43.5
SSC
0.47
3.89
0.12
45.6
Sand
0.72
2.24
0.32
328
Moraine
0.65
2.52
0.25
270
PAHs
b
Clay
0.0001
576.44
1.7 × 10
−7
25
SC
0.0008
57.55
3.7 × 10
−6
25
SSC
0.001
48.79
2.0 × 10
−5
30
Sand
0.002
12.49
1.6 × 10
−4
40
Moraine
0.002
17.47
1.1 × 10
−4
40
Lead
Clay
0.03
234
1.2 × 10
−4
25
SC
0.3
11.7
0.02
25
SSC
0.34
9.94
0.03
25
Sand
1.1
3.03
0.36
30
Moraine
1.0
3.56
0.28
30
Mercury
Clay
1.57
41,800
3.70 × 10
−5
30
SC
2.52
19,140
1.31 × 10
−4
20
SSC
2.77
17,600
1.57 × 10
−4
20
Sand
3.10
15,600
1.98 × 10
−4
No data
Moraine
2.85
16,328
1.74 × 10
−4
No data
Chromium VI
Clay
948
10.2
93
40
SC
2,080
4
520
No data
SSC
2,116
3.5
604
No data
Sand
2,300
3.0
766
2,200
Moraine
2,190
3.2
684
No data
Arsenic
Clay
9.88
7,800
1.26 × 10
−3
30
SC
11.26
2,950
3.81 × 10
−3
No data
SSC
21.12
2,850
7.41 × 10
−3
No data
Sand
50.25
2,400
2.09 × 10
−2
40
Moraine
43.65
2,615
1.66 × 10
−3
No data
Chlordane
Clay
0.0035
28,850
1.21 × 10
−7
25
SC
0.035
2,663
1.31 × 10
−5
No data
SSC
0.041
2,215
1.85 × 10
−5
No data
Sand
0.046
1,876
2.45 × 10
−5
No data
Moraine
0.043
1,950
2.21 × 10
−5
25
Total PCBs
Clay
0.000026
17,992
1.0 × 10
−9
25
SC
0.00026
2,800
9.3 × 10
−8
25
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