Executive Summary

v

1.

Introduction

1

2.

Methodology

3

3.

Results/Discussion

9

3.1

Initial Screening

9

3.1.1

Trace Elements

9

3.1.2

Polynuclear Aromatic Hydrocarbons

17

3.1.3

Nitrogen Heterocyclics

21

3.1.4

Sulfur Heterocyclics

23

3.1.5

Oxygen Heterocyclics

23

3.1.6

Phenols

23

3.1.7

Mercaptans

26

3.1.8

Aromatic Amines

26

3.1.9

Benzene and Substituted Benzenes

27

3.1.10

Aliphatics, Alicyclics, and Fatty Acids

29

3.1.11

Nitrosamines

31

3.1.12

Gases

31

4.

Relative Risk Assessment

37

4.1

Categorization

37

4.2

Comparison of Relative Risks

38

4.2.1

Ambient Concentrations and Environmental Standards

38

4.2.2

Body Burdens

50

4.2.3

Substances of Concern

53

References

57