Bioaccumulation Monitoring

Bioaccumulation monitoring identified PCB contamination in fish in Little Bayou Creek and mercury contamination in fish in Big Bayou Creek as primary concerns. Massac Creek in McCracken County, Kentucky was used as a reference site, providing data on background concentrations at a local uncontaminated site and samples for use as analytical controls.

Mean PCB concentrations in sunfish from Little Bayou Creek (LUK) were higher than in fish from reference sites on all sampling dates. Highest concentrations were found at LUK 9.0, the site nearest the PGDP discharges (Figure 1).
The increase in fall 1998 values (Figure 1) shows the highly variable nature of the PGDP sources of PCBs and demonstrates the need for additional study of the sources/transport within the facility.
Average mercury contamination in bass from Big Bayou Creek (BBK) was also higher than at reference sites, and showed a general decline from 1992 through 1998 (Figure 2).

Figure 1. Downstream profiles of mean ( SE) PCB concentrations in filets of longear sunfish (Lepomis megalotis) collected from Little Bayou Creek, fall 1997-fall 1998.

Figure 2. PCB Concentrations in Sunfish, LUK 9.2 (Spring 1992 - Fall 1998).

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Last Modified: April 17, 2001