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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 | 0.15 | 0.15 | 0.16 | 0.15 | 0.7 | 0.05 | 459 | 0.3 | 10 | |||||||||||||
| 2001 | 0.1 | 0.1 | 0.14 | 0.1 | 0.5 | 0.04 | 498 | 0.2 | 10 | |||||||||||||
| 2000 | 0.1 | 0.1 | 0.12 | 0.1 | 1.9 | 0.10 | 458 | 0.2 | 8 | |||||||||||||
| 1999 | 0 | |||||||||||||||||||||
| 1998 | 0.1 | 0.1 | 0.1 | 1.0 | 0.11 | 256 | 0.2 | |||||||||||||||
| 1997 | 0.1 | 0.1 | 0.14 | 0.3 | 1.6 | 0.13 | 557 | 0.2 | 9 | |||||||||||||
| 1996 | 0.1 | 0.1 | 0.12 | 0.1 | 2.4 | 0.15 | 626 | 0.2 | 8 | |||||||||||||
| 1995 | 0.1 | 0.1 | 0.14 | 0.3 | 1.0 | 0.10 | 616 | 0.2 | 9 | |||||||||||||
| 1994 | 0.1 | 0.1 | 0.13 | 0.1 | 3.1 | 0.18 | 609 | 0.2 | 8 | |||||||||||||
| 1993 | 0.1 | 0.1 | 0.14 | 0.3 | 0.6 | 0.08 | 596 | 0.2 | 9 | |||||||||||||
| 1992 | 0.1 | 0.1 | 0.14 | 0.2 | 0.9 | 0.09 | 591 | 0.2 | 9 | |||||||||||||
| 1991 | 0.1 | 0.1 | 0.14 | 0.3 | 1.3 | 0.13 | 505 | 0.2 | 9 | |||||||||||||
| 1990 | 0.1 | 0.1 | 0.2 | 1.3 | 0.13 | 333 | 0.2 | |||||||||||||||
| 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. |
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