DOE/ORO/2327 Oak Ridge Reservation Annual Site Environmental ...

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Oak Ridge Reservation Fig. 4.28. Locations of biological monitoring reference sites in relation to the Oak Ridge Y-12 National Security Complex. 4.5.9.1 Bioaccumulation Studies Mercury and PCB levels in fish from East Fork Poplar Creek (EFPC) have been historically elevated relative to fish in uncontaminated reference streams. Fish in EFPC are monitored regularly for mercury and PCBs to assess spatial and temporal trends in bioaccumulation associated with ongoing remedial activities and Y-12 Complex operations. As part of this monitoring effort, redbreast sunfish (Lepomis auritus) and rock bass (Ambloplites rupestris) are collected twice a year from five sites throughout the length of EFPC and are analyzed for tissue concentrations of mercury (twice yearly) and PCBs (annually). Mercury concentrations remained much higher during 2009 in fish from East Fork Poplar Creek than in fish from reference streams. Elevated mercury concentrations in fish from the upper reaches of EFPC indicate that the Y-12 Complex remains a continuing source of mercury to fish in the stream. Although waterborne mercury concentrations in the upper reaches of EFPC decreased substantially following the 2005 start-up of a treatment system on a mercury-contaminated spring (Fig. 4.29), mercury concentrations in fish have not yet decreased in response and were significantly higher in 2009 than in recent years. Mean concentrations of PCBs in fish at EFK 23.4 (the site where PCBs in fish are highest) continued to be much lower in 2009 than peak concentrations observed in the mid 1990s (Fig. 4.30). 4.5.9.2 Benthic Invertebrate Surveys Benthic macroinvertebrate communities were monitored at three sites in East Fork Poplar Creek and at two reference streams in the spring of 2009. The macroinvertebrate communities at EFK 23.4 and EFK 24.4 remained degraded as compared with reference communities, especially in the richness of pollution-sensitive taxa (i.e., EPT taxa richness; Fig. 4.31). Of note is a similar recent trend of reductions 4-56 The Y-12 National Security Complex
Annual Site Environmental Report Fig. 4.29. Semiannual average mercury concentration in water and muscle fillets of redbreast sunfish and rock bass in East Fork Poplar Creek at EFK 23.4 through spring 2009. Fig. 4.30. Mean concentrations of PCBs in redbreast sunfish and rock bass muscle fillets in East Fork Poplar Creek at EFK 23.4 through Spring 2009 (EFK = East Fork Poplar Creek kilometer). The Y-12 National Security Complex 4-57
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Oak Ridge Reservation Annual Site E
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Oak Ridge Reservation 3. East Tenne
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Oak Ridge Reservation 5.3.2 Clean A
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Figures Figure Page 1.1. Location o
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Oak Ridge Reservation 3.30. Results
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1. Introduction to the Oak Ridge Re
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Fig. 1.1. Location of the city of O
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Appendix A. Errata
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Appendix B. Glossary
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Oak Ridge Reservation biota — The
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Oak Ridge Reservation committed dos
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Oak Ridge Reservation hectare — A
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Oak Ridge Reservation quality facto
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Oak Ridge Reservation total dissolv
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Appendix C. Climate Overview for th
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C-6 Appendix C. Climate Overview fo
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C-8 Appendix C. Climate Overview fo
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Table D.1. Reference standards for
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TDEC and EPA Drinking Water Standar
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Chemical TDEC and EPA Drinking Wate
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Appendix E. National Pollutant Disc
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Appendix F. Radiation This appendix
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F.2.2 Non-ionizing Radiation Annual
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F.5.10 Dose from Consumer Products
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The ED from swimming in water conta
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Appendix G. Chemicals This appendix
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Table G.1. Chemical reference doses
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BW = body weight (70 kg), and Annua
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