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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
El Cajon-Redwood Avenue
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 0.02 0.021 0.03 0.07 0.013 29 0.02 0.2
2001
0.01 0.01 0.019 0.03 0.08 0.015 30 0.02 0.2
2000
0.01 0.02 0.143 0.08 2.4 0.466 28 0.02 2
1999
0.01 0.02   0.04 0.19 0.039 23 0.02  
1998
0.01 0.01   0.03 0.04 0.010 21 0.02  
1997
0.01 0.01 0.021 0.04 0.14 0.027 26 0.02 0.2
1996
0.01 0.01 0.024 0.03 0.08 0.015 30 0.02 0.3
1995
0.01 0.04 0.040 0.07 0.10 0.026 29 0.02 0.4
1994
0.01 0.01   0.07 1.7 0.323 27 0.02  
1993
0.01 0.03 0.046 0.06 0.24 0.051 28 0.02 0.5
1992
0.01 0.04 0.054 0.10 0.16 0.039 29 0.02 0.6
1991
0.01 0.04 0.047 0.07 0.32 0.056 29 0.02 0.5
1990
0.01 0.04 0.057 0.08 0.27 0.048 30 0.02 0.6
1989
0.02 0.06 0.113 0.17 1.1 0.216 24 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.