Annual Benzene Summary for North Long Beach

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ARB:

AQD:


	Annual Toxics Summary
	North Long Beach
	Benzene
	parts per billion

Year

Months
Present

Minimum

Median

90th
Percentile

Maximum

Standard
Deviation

Number of
Observations

Detection
Limit

Estimated
Risk

2002

0.21

0.57

0.705

1.25

2.1

0.45

26

0.05

65

2001

0.27

0.54

1.7

3.1

0.66

26

0.05

2000

0.3

0.7

1.00

1.9

2.7

0.65

28

0.2

92

1999

0.2

0.7

1.11

1.8

3.9

0.82

24

0.2

103

1998

0.5

0.9

1.16

2.1

2.9

0.68

30

0.2

108

1997

0.1

0.9

1.24

2.3

3.5

0.82

31

0.2

115

1996

0.25

1.0

2.4

4.1

1.01

22

0.5

1995

0.25

1.3

1.69

3.7

4.6

1.10

31

0.5

157

1994

0.25

1.8

2.04

3.6

6.0

1.19

29

0.5

188

1993

0.25

1.4

1.99

4.0

5.0

1.16

32

0.5

185

1992

0.8

2.0

2.60

4.9

6.5

1.50

30

0.5

241

1991

0.8

2.3

2.45

4.6

6.7

1.47

29

0.5

227

1990

1.4

2.8

3.53

6.5

9.2

2.05

31

0.5

327

1989

2.0

2.6

8.6

9.6

2.67

21

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.