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CADDIS Volume 3: Examples & Applications

Worksheets: Little Scioto River, OH

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Table 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 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 EPA 1996
Nitrate-nitrite 1.6 (mg/L) Ohio EPA 1999
Total phosphorus 0.28 (mg/L) Ohio EPA 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)

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