An Initial Assessment of Hanford Impact Performed with the System Assessment Capability

Bryce, R.W.; Kincaid, C.T.; Eslinger, Paul W.; Morasch, Launa F.

doi:10.2172/860131

Cited by 33 publications

(45 citation statements)

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“…For purpose four, the report provided links to specific pages, figures, and tables for locating specific information and data within documents. Information and data from the initial data catalog (Riley and Lo Presti 2001) was used in the preparation and application of a release data package for the conduct of the SAC initial assessment (Bryce et al 2002).…”

Section: Data Gathering Methodsmentioning

confidence: 99%

Release Data Package for Hanford Site Assessments

Riley¹,

Lopresti²,

Engel³

2006

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Section: Data Gathering Methodsmentioning

confidence: 99%

Release Data Package for Hanford Site Assessments

Riley¹,

Lopresti²,

Engel³

2006

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“…Earlier assessments have predicted that the tritium plume beneath the 200 Area will be transported to the Columbia River in the near-term (~100 years) until the source is exhausted, or until it decays below detection limits (Cole et al 1997, Bryce et al 2002. Predictions of the iodine-129 plume have shown that initial concentrations are not likely to fall significantly below current levels because of the radionuclide's long half-life, but will continue migrating toward and discharging to the Columbia River in the near-term.…”

Section: Selection Criteria For Cocsmentioning

confidence: 99%

Potential Impacts of Leakage from Black Rock Reservoir on the Hanford Site Unconfined Aquifer: Initial Hypothetical Simulations of Flow and Contaminant Transport

Freedman¹

2008

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“…The equations used in this report are discussed further in Appendix B. The ECEM code has been used in previous risk assessments for the Columbia River Comprehensive Impact Assessment: Screening Assessment and Requirements for a Complete Assessment (DOE 1998a) and Hanford site-wide assessments (Bryce et al 2002), 100-NR-2 Groundwater Operable Unit (DOE 2006a), 200-ZP-1 Groundwater Operable Unit (DOE 2006b), and 300-FF-5 Groundwater Operable Unit (Miley et al 2007). Table 5.1 lists the parameters used in modeling the simplified benthic aquatic food chain for this report.…”

Section: Parameterization Of Ecemmentioning

confidence: 99%

“…An example application of the earlier version of ECEM has been published by Bryce et al 2002. That analysis modeled 59 species along the riparian zone and in the Columbia River and examined chromium (metal), carbon tetrachloride (organic), and a suite of radioactive contaminants (including uranium as a radiological isotope and a chemical).…”

Section: Appendix a Data For Modeling Uptake By Aquatic Food Chainmentioning

confidence: 99%

Uranium in the Near-shore Aquatic Food Chain: Studies on Periphyton and Asian Clams

Bunn¹,

Miley²,

Eslinger³

et al. 2007

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SummaryThe benthic aquatic organisms that are found in the near-shore environment of the Columbia River are the first biological receptors that can be exposed to groundwater contaminants coming from the U.S. Department of Energy's Hanford Site. These benthic organisms are attached to the river substrate (e.g., periphyton) or move around within the substrate (e.g., clams) but are not found up in the water column (e.g., phytoplankton or fish like bass). The primary contaminant of concern in the former nuclear fuels processing area at the Site, known as the 300 Area, is uranium. Currently, there are no national clean up criteria for uranium and ecological receptors. This report summarizes efforts to characterize biological uptake of uranium in the food chain of the benthic aquatic organisms and provide information to be used in future assessments of uranium and the ecosystem.Uranium, as it enters the Columbia River from the groundwater, is likely to complex with the ions and other water quality characteristics, and the uranium complexes may be associated with the accumulation of uranium in the aquatic biota. The accumulation of uranium in the periphyton community and Asian clams (Corbicula fluminea) was investigated using laboratory studies, field measurements and ecological risk models. The general conclusions as a result of these investigations are listed below, with additional detail provided in relevant sections in the main body of this report. Laboratory Studies• Periphyton accumulates uranium readily. However, at concentrations as high as 100 μg/L uranium, there was no indication of an impact to the community from the presence of uranium based on biomass and chlorophyll content.• Asian clams accumulate uranium readily, but the rate of accumulation is dependent on water concentration.• Accumulation and loss of uranium in the soft tissue of clams changes based on exposure history. In pulsed-exposure studies where the accumulation was evaluated based on short-and long-term pulse of uranium, the concentration in the clam's soft tissues changed based on how long the tissues were exposed to uranium. Field Measurements• Asian clams represent one of the most common aquatic species collected in the Hanford Reach of the Columbia River. Periphyton has only been collected by a few programs.• Environmental media (e.g., river water and sediment) have been collected frequently, and offer a basis for evaluation in ecological risk assessments. Ecological Risk Modeling• Ecological Contaminant Exposure Model (ECEM) has been developed for the evaluation of risk to the aquatic food chain of the Hanford Reach of the Columbia River.• Parameters for evaluating risk using ECEM were assessed using values from literature sources, as well as calculations from laboratory studies and field measurements. The range and distribution of biological concentration factors (BCFs) from these three sources varied in range and distribution. Results indicated that additional improvements to ecological modeling results would benefit from further refin...

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An Initial Assessment of Hanford Impact Performed with the System Assessment Capability

Cited by 33 publications

References 0 publications

Release Data Package for Hanford Site Assessments

Release Data Package for Hanford Site Assessments

Potential Impacts of Leakage from Black Rock Reservoir on the Hanford Site Unconfined Aquifer: Initial Hypothetical Simulations of Flow and Contaminant Transport

Uranium in the Near-shore Aquatic Food Chain: Studies on Periphyton and Asian Clams

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