Table W1-18. Threshold Effects Levels and Probable Effects Levels available for PAHs and metals measured in sediments from the Little Scioto River. Values are in mg/kg, normalized to sediment dry weight. Source: U.S. EPA (1996).
| Chemical |
Threshold Effects Level |
Probable Effects Level |
| Benzo(a)pyrene |
0.03 |
0.32 |
| Fluoranthene |
0.04 |
0.32 |
| Benzo[a]anthracene |
0.03 |
0.28 |
| Chrysene |
0.02 |
0.41 |
| Benzo(g,h,i)perylene |
0.01 |
0.25 |
| Chromium |
32.3 |
119.4 |
| Copper |
28 |
101.2 |
| Lead |
37.2 |
81.7 |
| Zinc |
98.1 |
544 |
Table W1-19. Available criteria values.
| Chemical |
Criterion (units) |
Source |
| Ammonia |
1.27 mg/L at pH 8.0 0.57 mg/L at pH 8.5 |
U.S. EPA 1998 |
| Dissolved Oxygen |
3.0 mg/L for Modified Warmwater Habitat |
Ohio Environmental Protection Agency (1996) |
| Nitrate-nitrite |
1.6 (mg/L) |
Rankin et al. (1999) |
| Total phosphorus |
0.28 (mg/L) |
Rankin et al. 1999 |
| Copper |
21 (μg/l) |
U.S. EPA (1987) hardness of 200 mg/l |
| Lead |
7.7 (μg/l) |
U.S. EPA (1987) hardness of 200 mg/l |
| Zinc |
190 (μg/l) |
U.S. EPA (1987) hardness of 200 mg/l |
|