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

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Oak Ridge Reservation 5-54 Oak Ridge National Laboratory Fig. 5.25. Tritium discharges at White Oak Dam, 2005–2009. preceding completion of the waste area caps in Melton Valley, though they were somewhat higher than the previous two years, most likely as a result of higher instream flow volume in 2009 as compared to those years (see Fig. 5.26). Fig. 5.26. Annual flow volume at White Oak Dam, 2005–2009. 5.5.5 Total Mercury and Methylmercury Legacy mercury environmental contamination exists at ORNL, due largely to spills and releases that occurred in the 1950s during isotope separation pilot-scale work. Four ORNL facilities were involved, Buildings 3503, 3592, 4501, and 4505, and as a result, mercury is present in soils and groundwater in and around these facilities. Mercury also is present in Fifth Creek and White Oak Creek surface streams that receive surface runoff and groundwater flow from the area of these buildings.
Annual Site Environmental Report Process wastewater drains and building sumps from Buildings 4501 and 4505, the facilities where most of the ORNL mercury work was conducted, are routed via underground collection-system piping to the ORNL PWTC for treatment to remove constituents including mercury prior to discharge to White Oak Creek. In 2007, another groundwater sump in Building 4501 that had been found to accumulate legacy mercury contamination from building foundation drains was rerouted from storm drain Outfall 211 to the PWTC, and in 2009 a mercury pretreatment unit was installed in Building 4501 to remove most of the mercury from the sump discharge before its routing to the PWTC for final treatment. These recent actions have significantly diminished the release of legacy mercury contamination from the ORNL site to the White Oak Creek watershed (see Fig. 5.27). Fig. 5.27. Total aqueous mercury concentrations at sites in White Oak Creek downstream from ORNL, 1998–2009. For the mercury-investigation component of the WQPP, data collected during initial monitoring may lead to effluent sampling at additional outfalls in future WQPP revisions and are expected to help prioritize future abatement actions and help delineate mercury sources. Depending on the results of the 2009 characterization, follow-up efforts would be narrower in scope, focusing on more precise source identification, mechanism of mercury mobilization, or temporal variability of inputs from the most significant sources. In 2009, monitoring conducted under the WQPP included spring and fall rounds of dry-weather samples collected and analyzed from a number of instream points in the White Oak Creek watershed upstream, within, and downstream from the ORNL facilities complex and from certain ORNL NPDES outfalls where previous monitoring or site history has shown the potential for effluent mercury. Flow measurements were made for instream and outfall sampling locations, and analyses were conducted for total mercury, dissolved total mercury, methylmercury, and dissolved methyl mercury. Concentration and flux values were measured and calculated. Selected results of the 2009 monitoring are shown in Figs. 5.28 through 5.31, and complete mercury monitoring results can be found in the 2009 Environmental Monitoring Results (DOE 2009). Oak Ridge National Laboratory 5-55 .
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Oak Ridge Reservation Annual Site E
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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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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 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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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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