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

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Oak Ridge Reservation 5-72 Oak Ridge National Laboratory Fig. 5.43. ORNL sediment sampling locations. Fig. 5.44. ORNL sediment sampling results for 137 Cs, 2004–2009. Potassium-40, a naturally occurring radionuclide, was detected in sediments at all three locations. The only man-made radionuclide detected in sediments was 137 Cs downstream from ORNL at CRK 32. Figure 5.44 shows 6 years of 137 Cs results in sediment.
Annual Site Environmental Report Sampling for heavy rain event settleable solids took place in January and December 2009. Radionuclide concentrations for alpha, beta, and 137 Cs were higher at the downstream location, WCK 1.0, than those observed at upstream locations. 5.6 Groundwater Protection Program As in years past, groundwater monitoring at ORNL was conducted under two sampling programs in 2009: DOE Environmental Management (EM) monitoring and DOE Office of Science (OS) surveillance monitoring. The EM groundwater monitoring program was performed by BJC. The OS groundwater monitoring surveillance program was conducted by UT-Battelle. Results from the 2009 surveillance monitoring effort at exit pathway monitoring points indicate a continued decrease in trend in concentrations of radionuclides such as 3 H, total radioactive strontium, and gross beta activity at WOC Area Discharge wells. Where comparisons could be performed, upper tolerance limits estimated for metals such as iron, manganese, and aluminum are within range or below those upper tolerance limits estimated for groundwater in similar bedrock environments at ORNL. Where these metals are present, it is likely that they are sorbed onto suspended solids in the groundwater samples collected given that groundwater samples are not filtered prior to analysis. Overall, 2009 contaminant concentrations in groundwater observed in other watershed or sub-watershed discharge areas are consistent with observations described in past ASERs. Similar conclusions can be drawn for 2009 SNS results. Based on the results of the 2009 monitoring effort, there is no indication that current OS operations are significantly impacting groundwater at ORNL. 5.6.1 DOE-EM Groundwater Monitoring Monitoring was performed as part of an ongoing comprehensive CERCLA cleanup effort in Bethel and Melton Valleys at ORNL, the two administrative watersheds at the ORNL site. Groundwater monitoring for baseline and trend evaluation in addition to measuring effectiveness of completed CERCLA remedial actions is conducted by the Water Resources Restoration Program (WRRP). The WRRP has been managed by BJC for the DOE-EM program since its inception and is the vehicle for the EM program to carry out the monitoring requirements outlined in CERCLA decision documents. The results of CERCLA monitoring for the ORR for fiscal year 2009, including the monitoring at ORNL, are evaluated and reported in the 2010 Remediation Effectiveness Report for the U.S. Department of Energy Oak Ridge Reservation, Oak Ridge, Tennessee (DOE 2010) as required by the Federal Facilities Agreement for the ORR. The monitoring results and remedy effectiveness evaluations for Bethel and Melton Valley are reported in Sections 2 and 3, respectively, in the 2010 Remediation Effectiveness Report. The WRRP also conducts groundwater monitoring at SWSA 6 and submits the required annual groundwater monitoring report to TDEC in response to RCRA Permit. Groundwater monitoring conducted by the EM program at ORNL includes routine sampling and analysis of groundwater from 27 wells in Bethel Valley. In Melton Valley, where CERCLA remedial actions were completed in 2006 for the extensive waste management areas, the groundwater monitoring program includes monitoring groundwater levels in 80 wells to evaluate the effectiveness of hydrologic isolation of buried waste units. Additionally, groundwater is sampled and analyzed for a wide range of general chemical and contaminant parameters in 46 wells within the interior portion of the closed waste management area. Exit pathway groundwater monitoring conducted by the EM program includes sampling at six multiport monitoring wells in western Melton Valley (wells 4537, 4538, 4539, 4540, 4541, 4542) and 1 multiport well (4579) in western Bethel Valley. Oak Ridge National Laboratory 5-73
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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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Discharge Point Outfall 512 (Ground
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Uranium isotopes Annual Site Enviro
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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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Oak Ridge Reservation Pressure-driv
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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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Oak Ridge Reservation for winds fro
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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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