Table 2 Percent of the exposures to mixtures that fall into Group I (concern for individual chemicals), Group II (low concern for individual chemicals and combined exposures), and Group III (concern for combined exposures but not for exposures to individual chemicals) for human health effects, under different assumptions for addressing chemicals that may be present at levels below their detection limits (nondetects)
| Â | Percent of mixtures | ||
|---|---|---|---|
| Â | All samples | Surface water samples | WWTP effluent samples |
In Group I | Â | Â | Â |
Nondetects = 0 | 2% | 2% | 0 |
Nondetects = Detection limit/2 0.5 | 3% | 3% | 0 |
In Group II | Â | Â | Â |
Nondetects = 0 | 98% | 98% | 100% |
Nondetects = Detection limit/2 0.5 | 97% | 97% | 100% |
In Group IIIA | Â | Â | Â |
Nondetects = 0 | 0 | 0 | 0 |
Nondetects = Detection limit/2 0.5 | 0 | 0 | 0 |
In Group IIIB | Â | Â | Â |
Nondetects = 0 | 0 | 0 | 0 |
Nondetects = Detection limit/2 0.5 | 0 | 0 | 0 |