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

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Oak Ridge Reservation Table 4.20. History of waste management units included in groundwater monitoring activities, Chestnut Ridge Hydrogeologic Regime, 2009 Site Historical data Chestnut Ridge Sediment Disposal Basin 4-80 The Y-12 National Security Complex Operated from 1973 to 1989. Received soil and sediment from New Hope Pond and mercury-contaminated soils from the Y-12 Complex. Site was closed under RCRA in 1989. Not a documented source of groundwater contamination Kerr Hollow Quarry Operated from 1940s to 1988. Used for the disposal of reactive materials, compressed gas cylinders, and various debris. RCRA closure (waste removal) was conducted between 1990 and 1993. Certification of closure with some wastes remaining in place was approved by TDEC February 1995 Chestnut Ridge Security Pits United Nuclear Corporation Site Operated from 1973 to 1988. Series of trenches for disposal of classified materials, liquid wastes, thorium, uranium, heavy metals, and various debris. Closed under RCRA in 1989. Infiltration is the primary release mechanism to groundwater Received about 29,000 drums of cement-fixed sludges and soils demolition materials and low-level radioactive contaminated soils. Closed in 1992; CERCLA record of decision has been issued Industrial Landfill II Operated from 1983–1995. Central sanitary landfill for the Oak Ridge Reservation. Detection monitoring under postclosure plan has been ongoing since 1996 Industrial Landfill IV Opened for operations in 1989. Permitted to receive only nonhazardous industrial solid wastes. Detection monitoring under TDEC solid-waste-management regulations has been ongoing since 1988 Industrial Landfill V Facility completed and initiated operations April 1994. Baseline groundwater monitoring began May 1993 and was completed January 1995. Currently under TDEC solid-waste-management detection monitoring Construction/Demolition Landfill VI Construction/Demolition Landfill VII Facility operated from December 1993 to November 2003. The postclosure period ended and the permit was terminated March 2007 Facility construction completed in December 1994. TDEC granted approval to operate January 1995. Baseline groundwater quality monitoring began in May 1993 and was completed in January 1995. Permit-required detection monitoring per TDEC was temporarily suspended October 1997 pending closure of construction/demolition Landfill VI. Reopened and began waste disposal operations in April 2001 Filled Coal Ash Pond Site received Y-12 Steam Plant coal ash slurries. A CERCLA record of decision has been issued. Remedial action complete East Chestnut Ridge Waste Pile Operated from 1987 to 1989 to store contaminated soil and spoil material generated from environmental restoration activities at Y-12. Closed under RCRA in 2005 and incorporated into RCRA Postclosure Plan issued by TDEC in 2006 Abbreviations CERCLA = Comprehensive Environmental Response, Compensation, and Liability Act RCRA = Resource Conservation and Recovery Act TDEC = Tennessee Department of Environment and Conservation 4.6.4.3.1 Plume Delineation Through extensive monitoring of the wells on Chestnut Ridge, the horizontal extent of the volatile organic compound plume at the Chestnut Ridge Security Pits seems to be reasonably well defined in the water table and shallow bedrock zones. With two possible exceptions, historical monitoring indicates that the volatile organic compound plume from the Chestnut Ridge Security Pits has not migrated very far in any direction [305 m (
Annual Site Environmental Report western lateral extent of the plume of volatile organic compounds at the site has not changed significantly from previous years. The continued observation of volatile organic compound contaminants over the past several years at a well approximately 458 m (1,500 ft) southeast of the Chestnut Ridge Security Pits shows that some migration of the eastern plume is apparent. Additionally, dye tracer test results and the intermittent detection of volatile organic compounds (similar to those found in wells adjacent to the Chestnut Ridge Security Pits) at a natural spring approximately 2745 m (9,000 ft) to the east and along geologic strike may indicate that Chestnut Ridge Security Pits groundwater contaminants have migrated much further than the monitoring well network indicates. 4.6.4.3.2 Nitrate Nitrate concentrations were below the drinking water standard at all monitoring stations in the Chestnut Ridge Hydrogeologic Regime. 4.6.4.3.3 Trace Metals A chromium result exceeding the drinking water standard (0.1 mg/L) was observed in a groundwater sample from one well (GW-305) at the Industrial Landfill IV (Fig. 4.33) with a maximum concentration of 0.13 mg/L. The presence of this trace metal in groundwater at the Y-12 Complex, with the exception of the S-3 Site, is not due to historical waste disposal but to corrosion of well casings. Nickel is a primary component of stainless steel, and its presence indicates the occurrence of corrosion and subsequent dissolution of stainless steel well casing and screen materials due to chemical or biochemical processes (LMES 1999). 4.6.4.3.4 Volatile Organic Compounds Monitoring of volatile organic compounds in groundwater attributable to the Chestnut Ridge Security Pits has been in progress since 1987. A review of historical data indicates that concentrations of volatile organic compounds in groundwater at the site have generally decreased since 1988. However, a shallow increasing trend in volatile organic compounds in groundwater samples from monitoring well GW-798 to the southeast and downgradient of the Chestnut Ridge Security Pits has been developing since CY 2000 (Fig. 4.40). Elevated concentrations observed in GW-798 appear to fluctuate with changing precipitation conditions. The volatile organic compounds detected in CY 2009 in Well GW-798 continue to be characteristic of the Chestnut Ridge Security Pits plume. At Industrial Landfill IV, a number of volatile organic compounds have been observed since 1992. Monitoring well GW-305, located immediately to the southeast of the facility, has historically displayed concentrations of compounds below applicable drinking water standards, but the concentrations have exhibited a shallow increasing trend. In CY 2009, samples slightly exceeded the standard for 1,1-dichloroethene, resulting in the issuance of a regulatory notice of violation by the Tennessee Department of Environment and Conservation (see Section 2.5 for more details). 4.6.4.3.5 Radionuclides In CY 2009, no gross alpha activity above the drinking water standard of 15 pCi/L was observed in any groundwater samples collected in the Chestnut Ridge Hydrogeologic Regime. Gross beta activities exceeded the screening level of 50 pCi/L at monitoring well GW-205 (Fig. 4.42) at the United Nuclear Corporation site (the maximum detected activity was 64.3 pCi/L). This location has consistently exceeded the screening level since August 1999. Isotopic analyses show a correlative increase in the beta-emitting radionuclide potassium-40, which is not a known contaminant of concern at the United Nuclear Corporation Site. The source of the radioisotope is not known. 4.6.4.3.6 Exit Pathway and Perimeter Monitoring Contaminant and groundwater flow paths in the karst bedrock underlying the Chestnut Ridge regime have not been well characterized by conventional monitoring techniques. A number of tracer studies have The Y-12 National Security Complex 4-81
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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 Source ID 7-4
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Oak Ridge Reservation 7-6 Dose Tabl
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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-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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