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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Chula Vista
Trichloroethylene
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.01 0.03 0.060 0.15 0.18 0.058 31 0.02 0.6
2001
0.01 0.02 0.038 0.08 0.17 0.040 30 0.02 0.4
2000
0.01 0.03 0.051 0.14 0.20 0.053 29 0.02 0.5
1999
0.01 0.04   0.15 0.20 0.057 18 0.02  
1998
0.01 0.05   0.11 0.13 0.038 25 0.02  
1997
0.01 0.02 0.061 0.11 0.85 0.156 29 0.02 0.7
1996
0.01 0.05   0.14 0.26 0.062 26 0.02  
1995
0.01 0.05 0.060 0.11 0.13 0.037 29 0.02 0.6
1994
0.01 0.01 0.020 0.05 0.11 0.024 31 0.02 0.2
1993
0.01 0.01 0.013 0.01 0.06 0.010 31 0.02 0.1
1992
0.01 0.02 0.028 0.05 0.14 0.027 30 0.02 0.3
1991
0.01 0.03 0.053 0.07 0.49 0.089 28 0.02 0.6
1990
0.01 0.04 0.048 0.07 0.21 0.037 31 0.02 0.5
1989
0.01 0.06 0.107 0.14 0.91 0.175 25 0.02 1
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.