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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Chico-Manzanita 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 0.01 0.016 0.04 0.05 0.013 30 0.02 0.2
2001
0.01 0.01 0.017 0.03 0.04 0.009 31 0.02 0.2
2000
0.01 0.02   0.06 0.18 0.038 24 0.02  
1999
0.01 0.01   0.04 0.05 0.013 18 0.02  
1998
0.01 0.01   0.02 0.23 0.041 28 0.02  
1997
0.01 0.01   0.02 0.04 0.008 28 0.02  
1996
0.01 0.01 0.023 0.05 0.14 0.026 31 0.02 0.2
1995
0.01 0.01 0.018 0.03 0.07 0.014 30 0.02 0.2
1994
0.01 0.01 0.011 0.01 0.06 0.009 31 0.02 0.1
1993
0.01 0.01 0.013 0.02 0.03 0.006 30 0.02 0.1
1992
0.01 0.01   0.01 0.01 0.000 16 0.02  
1991
            0    
1990
            0    
1989
            0    
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.