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Paducah Site ORNL 95-7164C1abh I[ i - • -. - Paducah Site Boundary *Combined at C617 pond and discharged through 011/010 Figure 8.3 Biological monitoring, sampling locations. Watershed Monitoring A detailed Watershed Monitoring Report is generated on an annual basis in accordance with the approved Watershed Monitoring Program Plan. 'Sampling for the 1999 report was completed during the month of September. The 1999 report concluded that historical contamination from PGDP is detectable as fish in Bayou and Little Bayou creeks continue to have elevated PCB levels in tissue (CDM 2000). These levels, however, are on the decline based on PCB levels in fish tissue data that have been 8-6 NonradiologicalEnvironmental Surveillance
Annual Site Environmental Report for 1999 collected from 1990 to 1999. These data were reported annually from 1990 to 1998 by the Oak Ridge National Laboratory in an annual report entitled Report on the Biological Monitoring Program at the Paducah Gaseous Diffusion Plant (Kszos 1994a, 1994b, 1996a, 1996b, 1997, 1998, arid 1999). A concern is the relative high concentrations found in fish collected during the 1:998 sampling effort. Levels observed for 1999 sampling Were reduced, but other parameters of the fish communities examined were different than that seen in previous years. Macroinvertebrate fauna were significantly different in the downstream sampling sites as compared to the upstream (BBK 12.5) and reference (MAK 13.8) sites. Although these differences could not be directly attributed to contaminant discharge from the PGDP, future sampling will be evaluated· to include a downstream macroinvertebrate sample on Massac Creek. Such a site may clarify whether changes in the macroinvertebrate fauna are due to PGDP discharge or the fact that the sites are associated with the Ohio River floodplain and thus, are ecologically different. PCB levels from the Paducah Site KPDES outfalls. Levels of bioaccumulation of PCBs recorded during 1999 are still of biological significance. Therefore, concern still exists for the possible release of PCBs and other toxicants (metals and radionuclides) during major rainfall events. Continued implementation of erosion control measures .around the site will reduce the likelihood of the . additional release of PCBs during major rainfall events. A summary of the mean concentration of PCBs in fish fillets sampled in Bayou and Little Bayou Creeks as well as the reference location in Massac Creek are provided in Table 8.3. Toxicity Monitoring The toxicity of effluents from the continuously flowing Outfall 001 an~ intermittently flowing Outfalls 015, 017, and· 019 were monitored using water fleas (Ceriodaphnia dubia) and fathead minnow (Pimephales promelas) larvae. Toxicity tests were conducted quarterly as required by the KPDES permit. Short-term 48-hour toxicity tests The ecological health, based on macroinvertebrate and fish faunas, of Little Bayou and Bayou creeks is of concern. Significant differences were noted in the macroinvertebrate fauna and significant declines in the fish density and biomass were recorded for BBK 12.5 and LUK 7.2. Of importance is the fact that all sites show continued species diversity, but the density reductions at BBK 12.5 and LUK 7.2 should remain a concern. Biomass reductions at all of the sites sampled suggest that an ecological event(s) probably accounts for the observed declines, but recovery on the reference and PGDP-influencedcreeks needs to be monitored closely. An occurrence of an ecological event could be due in part . to the severe drought western Kentucky experienced during the summer and early fall of 1999. Bioaccumulation of PCBs in fish tissue has declined in· recent years, suggesting decreased . ~" '. "..:l.: . , . . Table 8.3 Average Concentration of PCBs (j.l.g/g wet weight) In Filets of Fish from Streams near the Paducah Site, April and October 1999 Site a Species b Meanc Range BBK 10.0 Spotted 0.12 0.12 bass LUK 9.0 Longear 0.24 0.10- sunfish 0.60 LUK 7.2 Longear 0.13
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Units of Radiation Measure Current
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Paducah; Site Contents Figures ....
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Paducah Site Figures Figure Page 1.
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Paducah Site Table Page 9.5 Summary
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Paducah· Site DNAPL DNFSB DOE DOJ
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Paducah Site mgd mg/d mg/L Min ml m
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Paducah Site environment, and the P
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Paducah Site I' Figure 1.2 The Padu
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Paducah Site Upland mixed hardwoods
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Paducah Site 1-8 Site Operation and
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Paducah Site Table 2.1 Environmenta
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Paducah Site longer than one year.
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Paducah Site Comprehensive Environm
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Paducah Site Places, although there
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Paducah Site i- 2-10 DOE activities
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Paducah Site that in the toxicity t
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Paducah Site Paducah Site did not r
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Paducah Site maintain records of sy
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Paducah Site 2-18 Environmental Com
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Paducah Site operations and waste m
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Paducah Site Northwest Plume Ground
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Page 82 and 83: Paducah Site ; ,- materials release
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Page 86 and 87: Paducah Site The 50-year CEDE (inte
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