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| Year | Months Present |
Minimum | Median | Mean | 90th Percentile |
Maximum | Standard Deviation |
Number of Observations |
Detection Limit |
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| 2002 | 0.025 | 0.14 | 0.314 | 0.82 | 3.3 | 0.443 | 474 | 0.05 | |||||||||||||
| 2001 | 0.025 | 0.13 | 0.348 | 0.89 | 8.2 | 0.685 | 486 | 0.05 | |||||||||||||
| 2000 | 0.025 | 0.15 | 0.396 | 1.05 | 5.3 | 0.603 | 506 | 0.05 | |||||||||||||
| 1999 | 0.025 | 0.21 | 0.456 | 1.29 | 4.8 | 0.615 | 592 | 0.05 | |||||||||||||
| 1998 | 0.025 | 0.22 | 0.476 | 1.3 | 4.1 | 0.646 | 603 | 0.05 | |||||||||||||
| 1997 | 0.025 | 0.19 | 0.522 | 1.3 | 9.2 | 0.817 | 575 | 0.05 | |||||||||||||
| 1996 | 0.025 | 0.21 | 0.419 | 1.1 | 4.5 | 0.555 | 452 | 0.05 | |||||||||||||
| 1995 | 0.025 | 0.35 | 0.568 | 1.3 | 3.8 | 0.599 | 448 | 0.05 | |||||||||||||
| 1994 | 0.10 | 0.83 | 2.4 | 7.1 | 1.07 | 264 | 0.05 | ||||||||||||||
| 1993 | 0.025 | 0.43 | 0.979 | 2.66 | 6.7 | 1.18 | 455 | 0.05 | |||||||||||||
| 1992 | 0.025 | 0.31 | 0.774 | 2.2 | 5.8 | 1.08 | 456 | 0.05 | |||||||||||||
| 1991 | 0.025 | 0.37 | 0.874 | 2.4 | 8.0 | 1.19 | 451 | 0.05 | |||||||||||||
| 1990 | 0.025 | 0.83 | 2.6 | 15 | 1.88 | 152 | 0.05 | ||||||||||||||
| 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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