Annual Benzene Summary for Stockton-Hazelton Street

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ARB:

AQD:


	Annual Toxics Summary
	Stockton-Hazelton Street
	Benzene
	parts per billion

Year

Months
Present

Minimum

Median

90th
Percentile

Maximum

Standard
Deviation

Number of
Observations

Detection
Limit

Estimated
Risk

2002

0.18

0.36

0.521

0.96

1.5

0.348

28

0.05

48

2001

0.15

0.4

0.454

0.7

1.6

0.317

31

0.05

42

2000

0.1

0.3

0.58

1.7

2.3

0.59

31

0.2

54

1999

0.1

0.5

0.65

1.2

1.8

0.43

31

0.2

60

1998

0.1

0.5

0.69

1.5

1.8

0.47

31

0.2

64

1997

0.1

0.5

0.52

0.9

1.9

0.41

30

0.2

48

1996

0.25

0.25

0.64

1.5

2.2

0.58

33

0.5

60

1995

0.25

1.0

1.05

2.4

2.9

0.87

30

0.5

97

1994

0.25

1.0

1.23

2.1

3.4

0.89

31

0.5

113

1993

0.25

1.0

2.6

4.6

1.08

33

0.5

1992

0.25

1.4

1.37

2.2

3.5

0.81

28

0.5

127

1991

0.25

1.5

1.95

3.8

4.7

1.25

29

0.5

181

1990

0.8

1.9

2.01

3.5

4.5

1.07

30

0.5

186

1989

1.0

2.1

4.5

7.2

1.44

22

0.5



	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. Risks shown only for those substances with unit risk factors.