Combination RCRA groundwater monitoring plan for the 216-A-10, 216-A-36B, and 216-A-37-1 PUREX cribs

Lindberg, Jon W.

doi:10.2172/527499

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…The primary source for the iodine-129 is PUREX process condensate previously discharged to the 216-A-10 and 216-A-45 cribs. Evaporator condensate discharged to the 216-A-31 crib also may have contributed to the widely dispersed plume that remains today (Lindberg 1997).…”

Section: Extent Of Contamination Waste Management Area A-ax -Geographmentioning

confidence: 99%

Data Package for Past and Current Groundwater Flow and Contamination beneath Single-Shell Tank Waste Management Areas

Horton¹

2007

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Aquifer testing has shown that vertical hydraulic gradients exist in some wells in the 200 West Area. Vertical flow is upward in some places and downward in other places. The reason for the vertical flow is not known for certain. Nevertheless, vertical flow has important implications pertaining to (1) the representativeness of groundwater samples collected from monitoring wells and (2) the vertical distribution of contaminants in the aquifer.The major contaminants of concern in the groundwater below and locally adjacent to all single-shell tank waste management areas (WMAs) in 200 West Area are carbon tetrachloride, technetium-99, and nitrate. Chromium and tritium are contaminants present at WMAs T, TX-TY, and S-SX; iodine-129 is of concern at WMA TX-TY and fluoride is of concern at WMA T. The groundwater contaminants of concern below all single-shell tank WMAs in 200 East Area are nitrate, technetium-99, and tritium. Sulfate, uranium, cobalt-60, and cyanide are also of concern at WMA B-BX-BY, and cyanide is of concern at WMA C.Vertical concentration gradients are known to exist in the upper unconfined aquifer at several singleshell tank WMAs:• Around WMA T, maximum technetium-99 concentrations occur at the water table in some wells and 10 m below the water table in other wells east of the WMA.• Around WMA TX-TY, maximum concentrations of nitrate, technetium-99, and iodine-129 are within 1 m of the water table in the high concentration plume east of the WMA.• Around WMA S-SX, chromium, nitrate, and technetium-99 are present throughout the upper 23 m of the unconfined aquifer near the center of the plume south of the WMA. Technetium-99 and nitrate decrease rapidly with depth in the aquifer at a well near the northern edge of the plume.• Around WMA B-BX-BY, the concentration of tritium increases with increasing depth at one well. The concentrations of technetium-99 and nitrate are high in a zone at the base of the aquifer in another well at WMA B-BX-BY. ivThe vertical concentration gradients are probably a function of several characteristics including distance to source area, salinity of waste fluids, and vertical hydraulic flow in the wells.Comparing the nitrate, technetium-99, and chromium concentrations in groundwater with concentrations in pore water representing leaked tank fluids suggests that tank waste has influenced groundwater at WMA T and WMA S-SX. Similar comparisons at WMA TX-TY and WMA B-BX-BY do not show similarities between groundwater, pore water and estimated tank fluid composition.v

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Section: Extent Of Contamination Waste Management Area A-ax -Geographmentioning

confidence: 99%

Data Package for Past and Current Groundwater Flow and Contamination beneath Single-Shell Tank Waste Management Areas

Horton¹

2007

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“…Radionuclides are not monitored under RCRA, thus they are not included in this RCRA monitoring plan. More details about the history of the RCRA PUREX cribs and their waste streams are in Lindberg (1997).…”

Section: History Of Facilitiesmentioning

confidence: 99%

“…This model is based on results of previous geological and hydrogeological studies, sediment sampling, and groundwater monitoring. Primary references are Lindberg (1997), Williams et al (2000), and groundwater monitoring annual reports (e.g., Hartman et al 2005). The model provides a basis for designing the near-field well network.…”

Section: Conceptual Modelmentioning

confidence: 99%

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Interim-Status RCRA Groundwater Monitoring Plan for the 216-A-10, 216-A-36B, and 216-A-37-1 PUREX Cribs

Lindberg¹,

Elmore²

2005

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This document presents a groundwater monitoring program for three Resource Conservation and Recovery Act of 1976 (RCRA) waste management units at the Hanford Site combined under one groundwater quality assessment program. The units are the 216-A-10, 216-A-36B, and 216-A-37-1 cribs (the RCRA plutonium-uranium extraction [PUREX] cribs). The three cribs have been grouped together based on their proximity to one another, similar construction and waste history, and similar hydrogeologic regime. The RCRA PUREX cribs are located in the 200 East Area of the Hanford Site. This document replaces the previous RCRA monitoring plan (Lindberg 1997) for these cribs. There are other cribs in the 200 East Area that received liquid waste from PUREX Plant operations that are not regulated under RCRA (e.g., 216-A-45 crib). Wells in the vicinity of these cribs are monitored under the 200-PO-1 Groundwater Operable Unit. The monitoring network comprises near-field wells (wells located in the immediate vicinity of the RCRA PUREX cribs) and far-field wells (wells located farther downgradient). The monitoring strategy for the far-field wells is included in the Sampling and Analysis Plan for the 200-PO-1 Groundwater Operable Unit (DOE-RL 2003). The monitoring strategy for the near-field wells is included in this plan. Near-field wells are listed below.

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Data Quality Objectives Summary Report - Designing a Groundwater Monitoring Network for the 200-BP-5 and 200-PO-1 Operable Units

Thornton¹,

Lindberg²

2002

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This document presents the results of a series of interviews held with technical, management, and regulatory staff to determine the groundwater data quality objectives (DQOs) for monitoring activities associated with the 200-BP-5 and 200-PO-1 operable units located in the Hanford Site 200 East Area. This assessment is needed to address changing contaminant plume conditions (e.g., plume migration) and to ensure that monitoring activities meet the requirements for performance monitoring as prescribed by the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), Resource Conservation and Recovery Act of 1976 (RCRA) past practice, and Atomic Energy Act of 1954 (AEA) regulatory requirements and orders. The general objectives and decisions associated with the DQO process were the following:

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Combination RCRA groundwater monitoring plan for the 216-A-10, 216-A-36B, and 216-A-37-1 PUREX cribs

Cited by 5 publications

References 3 publications

Data Package for Past and Current Groundwater Flow and Contamination beneath Single-Shell Tank Waste Management Areas

Data Package for Past and Current Groundwater Flow and Contamination beneath Single-Shell Tank Waste Management Areas

Interim-Status RCRA Groundwater Monitoring Plan for the 216-A-10, 216-A-36B, and 216-A-37-1 PUREX Cribs

Data Quality Objectives Summary Report - Designing a Groundwater Monitoring Network for the 200-BP-5 and 200-PO-1 Operable Units

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