Hanford Site Environmental Report for Calendar Year 2003

Poston, Ted M.; Hanf, Robert W.; Dirkes, Roger L.; Morasch, Launa F.

doi:10.2172/15020928

Cited by 5 publications

(11 citation statements)

References 52 publications

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“…− Uranium concentrations are above the drinking water standard at several riverbank spring locations. During 2003, the maximum observed value was ~160 µg/L (Poston et al 2004). The gross alpha associated with this uranium also exceeds the 15-pCi/L drinking water standard.…”

Section: 4mentioning

confidence: 92%

Contaminants of Potential Concern in the 300-FF-5 Operable Unit: Expanded Annual Groundwater Report for Fiscal Year 2004

Peterson¹,

Freeman²,

Thorne³

et al. 2005

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these estimates is caused by the need to make certain assumptions, such as the thickness of the contaminated layer. However, for the period evaluated, the trends in parameters suggest a relatively constant level of contamination, but with some variability. At the 618-11 sub-region, monitoring results since 1999 show decreasing tritium concentrations at wells closest to the source and variable concentrations at wells along the downgradient migration pathway. This plume has not reached the Energy Northwest water supply wells, nor the Columbia River. At the 316-4/618-10 sub-region, COPC are currently at levels below the drinking water standards, except for very recent samples from two wells near the 316-4 cribs excavation site that show concentrations near the 30-ug/L standard for uranium. A revised strategy for categorizing waste constituents in groundwater as a COC or COPC, along with the implications for remedial actions and regulatory decisions, is proposed. As a result, the lists developed during the remedial investigation have been shortened, primarily because of improving conditions and lack of evidence suggesting unacceptable risk. Conceptual Site Model for 300 Area Uranium. The 300 Area uranium plume can be characterized as persistent, i.e., the area and concentrations have remained similar to early 1990 conditions. There has been variability in spatial and temporal distribution patterns, primarily as a consequence of (a) cessation of liquid waste disposal to the ground, (b) large-scale source excavation activities, (c) unusually high and prolonged water table conditions during 1996 and 1997, and (d) seasonality because of river-stage fluctuations. During the most recent years, the plume appears to be relatively stable, with evidence showing gradual downgradient migration to the Columbia River. The highest concentrations observed currently are along the shoreline, and probably reflect the last significant input from beneath former major waste sites, such as the 316-5 process trenches. Uranium is lost from the plume via discharge to the river and groundwater withdrawal at a water supply well. Some amount of re-supply to the plume is believed to occur as a consequence of long-term release of uranium that has been sequestered on vadose zone and aquifer solids. The mobility of uranium and controls on dissolved concentrations are influenced by the geochemistry of the original waste effluent, the receiving sediment, and pore fluids, all of which vary in the 300 Area environment. The compositional and spatial variability leads to complexity in computer models designed for predicting plume behavior. The heterogeneity in conditions also drives the need for more field data on the locations, inventory, and geochemical characteristics of uranium in potential source zones. Conceptual Site Model for 618-11 Tritium. The tritium plume associated with the 618-11 sub-region has apparently been created by episodic release of tritium gas from irradiated materials in the burial ground. The gas interacts with moisture in the vad...

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Section: 4mentioning

confidence: 92%

Contaminants of Potential Concern in the 300-FF-5 Operable Unit: Expanded Annual Groundwater Report for Fiscal Year 2004

Peterson¹,

Freeman²,

Thorne³

et al. 2005

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“…In addition to the deepwater surveys conducted by PNNL during 2003, personnel from the ODFW counted a total of 190 fall Chinook salmon redds at the estimated peak spawning date of November 25, 2003, within the Ives and Pierce islands area by wading or observation by boat (FPC 2004). (Poston et al 2004). The majority of the fall Chinook salmon redds were found in the primary zone adjacent to Pierce Island, and the general area in which redds were found continued to increase from 4.0 ha in 1999 to 13.7 ha in 2003 (Table 4).…”

Section: Pierce Ismentioning

confidence: 97%

Deepwater Spawning of Fall Chinook Salmon (Oncorhynchus tshawtscha) Near Ives and Pierce Island of the Columbia River, 2003-2004 Annual Report.

Mueller¹

2004

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“…[1][2][3][4][5][6][7][8][9]. The 100, 400, and 600 Areas do not have any nonradiological emission sources of concern (Poston et al 2004). (a,b) 11,000 (25,000) ammonia (c) 16,000 (36,000) other toxic air pollutants (d) 8,100 (18,000)…”

Section: Emissions Of Nonradiological Pollutantsmentioning

confidence: 99%

“…This dose assessment uses a multi-media pathway assessment computer model known as GENII (Napier et al 1998). During 2003, the annual dose to a hypothetical maximally exposed individual was estimated to be 0.06 mrem (0.6 µSv) (Poston et al 2004). The average individual dose to the population living within 80 km (50 mi) of Hanford was calculated to be 0.001 mrem (0.01 µSv) (Poston et al 2004).…”

Section: Dose Assessmentsmentioning

confidence: 99%

Hanford Site National Environmental Policy Act (NEPA) Characterization Report

Neitzel¹,

Bunn²,

Cannon³

et al. 2004

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This document describes the U.S. Department of Energy's (DOE) Hanford Site environment. It is updated each year and is intended to provide a consistent description of the Hanford Site environment for the many environmental documents being prepared by DOE contractors concerning the National Environmental Policy Act (NEPA). No statements of significance or environmental consequences are provided. This year's report is the sixteenth revision of the original document published in 1988 and is (until replaced by the seventeenth revision) the only version that is relevant for use in the preparation of Hanford NEPA, State Environmental Policy Act (SEPA), and Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) documents.

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Hanford Site Environmental Report for Calendar Year 2003

Cited by 5 publications

References 52 publications

Contaminants of Potential Concern in the 300-FF-5 Operable Unit: Expanded Annual Groundwater Report for Fiscal Year 2004

Contaminants of Potential Concern in the 300-FF-5 Operable Unit: Expanded Annual Groundwater Report for Fiscal Year 2004

Deepwater Spawning of Fall Chinook Salmon (Oncorhynchus tshawtscha) Near Ives and Pierce Island of the Columbia River, 2003-2004 Annual Report.

Hanford Site National Environmental Policy Act (NEPA) Characterization Report

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