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| Year | Months Present |
Minimum | Median | Mean | 90th Percentile |
Maximum | Standard Deviation |
Number of Observations |
Detection Limit |
Estimated Risk |
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| 2002 | 0.27 | 1.5 | 0.459 | 9 | 0.05 | |||||||||||||||||
| 2001 | 0.17 | 0.35 | 0.82 | 2.8 | 0.509 | 28 | 0.05 | |||||||||||||||
| 2000 | 0.1 | 0.4 | 0.70 | 1.6 | 3.1 | 0.69 | 30 | 0.2 | 65 | |||||||||||||
| 1999 | 0.2 | 0.5 | 0.73 | 1.3 | 2.4 | 0.53 | 30 | 0.2 | 68 | |||||||||||||
| 1998 | 0.1 | 0.8 | 1.04 | 2.1 | 4.1 | 0.85 | 31 | 0.2 | 97 | |||||||||||||
| 1997 | 0.1 | 0.6 | 0.93 | 1.8 | 2.8 | 0.73 | 29 | 0.2 | 86 | |||||||||||||
| 1996 | 0.25 | 0.8 | 0.97 | 2.7 | 3.7 | 0.99 | 32 | 0.5 | 89 | |||||||||||||
| 1995 | 0.25 | 1.5 | 1.55 | 3.3 | 4.6 | 1.08 | 30 | 0.5 | 144 | |||||||||||||
| 1994 | 0.25 | 1.7 | 1.88 | 3.3 | 7.8 | 1.49 | 31 | 0.5 | 174 | |||||||||||||
| 1993 | 0.25 | 1.6 | 1.89 | 4.5 | 5.1 | 1.49 | 30 | 0.5 | 175 | |||||||||||||
| 1992 | 0.25 | 1.5 | 2.03 | 4.6 | 5.0 | 1.46 | 31 | 0.5 | 188 | |||||||||||||
| 1991 | 0.25 | 2.1 | 2.44 | 5.0 | 7.6 | 1.80 | 28 | 0.5 | 226 | |||||||||||||
| 1990 | 0.9 | 2.3 | 3.02 | 5.3 | 10 | 2.20 | 27 | 0.5 | 280 | |||||||||||||
| 1989 | 0.9 | 2.6 | 8.9 | 16 | 4.02 | 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. |
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