Table 21 continued. 



Chemical 

 substance 



Copper (ERM = 270 a ) 

 Mercury (ERM = 0.71 a ) 



Number of samples 

 in which ERM or SQC 

 values were exceeded 



2 

 30 



Samples in which 

 the the ERM or SQC 

 was exceeded 



12a, 18c 



la, 6c, 7b, 8c, 9b, 10a, 10b, lib, 



12a, 12b,13a, 16a, 16b, 17b, 17c, 



18a, 18c, 22c, 23a, 24c, 25a, 26a, 

 26c, 29a, 30a, 30b, 30c, 33b, 36c 



lib, 12a, 17c 



8c, 9b, 12a, 10b, lib, 12b, 17c, 18c 



9b, 12a, 18c, 30a, 33b 



9b, lib, 12a, 12b, 17b, 17c, 18a, 



18c, 22c, 23a, 24c, 33b 



9b, lib, 12a, 12b, 16a, 16b, 17b, 



17c, 18a, 18c, 22c, 23a, 29a, 36c 



7b, 8c, 9b, 10b 



7b, 8c, 9b, 10b, lib, 12a, 12b, 



16a, 17c 



7b, 8c, 9b, 10b, lib, 12a, 12b, 



14a, 16a, 16b, 17b, 17c, 23a, 26c 



7b, 7c, 8c, 9b, 10b, lib, 12a, 



12b, 13a, 14a, 16a, 16b, 17b, 



17c, 18a, 18c, 22c, 23a, 35a, 36c 



9b, 10b 



7b, 8c, 9b, 10b, lib, 16a, 17c 



a Effects Range-Median values from Long et al. (1995) 

 b Effects Range-Median values from Long and Morgan (1990) 

 c Sediment Quality Criteria from U.S. EPA (1994) 



Mercury was among the few trace elements that were correlated with amphipod survival. Also, many 

 of the samples exceeded the ERM value for mercury. The relationship between amphipod survival and 

 mercury concentrations in the sediments is illustrated in Figure 30. Amphipod survival decreased 

 relatively steadily with increasing mercury concentrations, especially when the levels exceeded the 

 ERM value of 0.71 (Long et al., 1995). 



Microbial bioluminescence EC50s were very low in all of the samples in which the concentrations of 

 4,4'-DDE were above the ERM value of Long and Morgan, 1990 (Figure 31). Although the Microtox 

 test results and the DDE concentrations were significantly correlated (Rho = -0.405, p<0.05), the pat- 

 tern in response was not nearly as clear as with other toxicity tests and chemicals (i.e., amphipod 

 survival correlated with the PAHs). 



The correlations between amphipod survival and the concentrations of all the PAHs were consistent 

 and clear. Also, the concentrations of these compounds often exceeded their respective guidelines. 

 The relationships between amphipod survival and selected PAHs are illustrated in Figures 32-35. At 

 concentrations of total low molecular weight PAHs below the ERM value of Long et al. (1995), amphi- 



84 



