published SQGs that corresponded to PECs for metals, PAHs,
PCBs, and organochlorine pesticides are presented in Table 3.
For each substance, consensus-based TECs or PECs were
derived if three or more acceptable SQGs were available. The
consensus-based TECs or PECs were determined by calculating
the geometric mean of the published SQGs and rounding to
three significant digits. Application of these procedures facilitated
the derivation of numerical SQGs for a total of 28
chemical substances, including 8 trace metals, 10 individual
PAHs and PAH classes, total PCBs, and 9 organochlorine
pesticides and degradation products. The consensus-based
SQGs that were derived for the contaminants of concern in
freshwater ecosystems are presented in Tables 2 and 3.
published SQGs that corresponded to PECs for metals, PAHs,PCBs, and organochlorine pesticides are presented in Table 3.For each substance, consensus-based TECs or PECs werederived if three or more acceptable SQGs were available. Theconsensus-based TECs or PECs were determined by calculatingthe geometric mean of the published SQGs and rounding tothree significant digits. Application of these procedures facilitatedthe derivation of numerical SQGs for a total of 28chemical substances, including 8 trace metals, 10 individualPAHs and PAH classes, total PCBs, and 9 organochlorinepesticides and degradation products. The consensus-basedSQGs that were derived for the contaminants of concern infreshwater ecosystems are presented in Tables 2 and 3.
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