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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Simi Valley-Cochran Street
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 0.01 0.012 0.01 0.04 0.008 27 0.02 0.1
2001
0.01 0.01 0.015 0.02 0.06 0.011 27 0.02 0.2
2000
0.01 0.01 0.030 0.05 0.17 0.035 29 0.02 0.3
1999
0.01 0.01   0.12 0.19 0.055 14 0.02  
1998
0.01 0.01   0.03 0.08 0.018 17 0.02  
1997
0.01 0.01 0.021 0.05 0.09 0.019 29 0.02 0.2
1996
0.01 0.01 0.041 0.05 0.69 0.124 30 0.02 0.4
1995
0.01 0.01 0.024 0.04 0.15 0.027 31 0.02 0.3
1994
0.01 0.01 0.016 0.03 0.09 0.020 29 0.02 0.2
1993
0.01 0.01 0.013 0.01 0.07 0.012 28 0.02 0.1
1992
0.01 0.06 0.059 0.09 0.17 0.033 29 0.02 0.6
1991
0.01 0.09 0.089 0.14 0.45 0.086 28 0.02 1
1990
0.01 0.03 0.050 0.10 0.15 0.038 28 0.02 0.5
1989
0.01 0.03 0.088 0.26 0.70 0.178 22 0.02 0.9
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.