Groundwater Monitoring and Tritium-Tracking Plan for the 200 Area State-Approved Land Disposal Site

Barnett, D. Brent

doi:10.2172/965183

Cited by 3 publications

(9 citation statements)

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“…The first list of groundwater analytes was derived as part of an evaluation of several potential SALDS locations (Harris and Delaney 1991). This list (see Barnett 2000) was applied to well 699-48-77A immediately after it was drilled in 1992 to gather "pre-facility baseline data." The list was applied through June 1993, whereupon a revised constituent list was adopted (Reidel 1993 Hydrograph of SALDS Wells applied to the other two SALDS proximal wells (699-48-77C and 699-48-77D) drilled in 1994.…”

Section: Groundwater Chemistry and Monitoring Resultsmentioning

confidence: 99%

“…The interpretation of the hydraulic head distribution in Figure 6 indicates that wells 699-51-75, 699-51-75P, and 699-48-71 northeast and east of the SALDS are regionally downgradient of the facility, and are in appropriate horizontal locations for intercepting SALDS effluent. The interpreted flow direction near SALDS has acquired a slightly more easterly component in the past few years (compare Barnett et al 2003with Barnett 2000, perhaps as a result of the continuing regional decline in water levels combined with SALDS effects.…”

Section: The Salds For March 2004 Showing Interpreted Groundwater Flomentioning

confidence: 99%

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Results of Groundwater Modeling for Tritium Tracking at the Hanford Site 200 Area State-Approved Land Disposal Site--2004

Barnett¹,

Bergeron²,

Freeman³

2004

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The purpose of this report is to present the results of the latest assessment of the impacts of treated water from the Hanford Site 200 Area Effluent Treatment Facility (ETF) that is currently being discharged and predicted to be discharged in the future to the drain field named the State-Approved Land Disposal Site (SALDS). The SALDS facility is located immediately north of 200-West Area in the Central Plateau of the Hanford Site in southeast Washington.The objectives of this updated assessment are to:• Incorporate up-to-date historical discharge and groundwater monitoring data (hydraulic head) into the current Hanford Site-Wide groundwater flow and transport model (from SALDS and adjoining areas).• Incorporate the most recent and accurate projections of future tritium disposal and water discharge volume to the SALDS.• Predict the lateral and vertical extent of travel in the subsurface of the tritium plume emanating from the SALDS • Predict the activities of tritium at various locations within the plume.• Provide improved sequential illustrations of predicted tritium plume behavior from present through the year 2140.• Recommend strategies for future monitoring based on model results.The numerical model used for this effort is revised from that used by Barnett et al. (1997) to reflect recent refinements in the Hanford Site-Wide Groundwater Model (SGM) and to incorporate actual water volume and tritium activity release information reported through June 2004. Simulations made in this assessment consider the hydraulic effect of past historical waste water discharges in the unconfined aquifer but only evaluates the potential impacts of tritium loading from past and projected future tritium discharges at the SALDS facility. Potential impacts of other sources of groundwater contamination for other nearby source areas are not considered in this analysis.This report presents a comparison of updated treated water discharges and tritium inventory values based on discharge records to the SALDS from its startup in 1995 through 2004 with projected values used in previous modeling summarized Barnett et al. (1997). This comparison shows that while actual discharge volumes through June 2004 exceeded projections made in previous modeling efforts, actual cumulative tritium inventories contained in discharges to the facility have been about one-half of inventories projected in previous analysis through the current year (2004). ivThe model results presented in this report incorporate the reported data through June 2004, and then uses projected discharge and tritium inventory values through 2034 that have been updated with more current information. Simulation results show that the tritium concentration in the aquifer reaching a maximum of 1.6 million pCi/L in 1996. After that time, predicted concentration levels at the water table were variable ranging from just over 1 million to several hundred thousand pCi/L and on a downward trend by the year 2004. These simulated results generally reflect the changes in simulated monthly effluent...

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Section: Groundwater Chemistry and Monitoring Resultsmentioning

confidence: 99%

Section: The Salds For March 2004 Showing Interpreted Groundwater Flomentioning

confidence: 99%

Results of Groundwater Modeling for Tritium Tracking at the Hanford Site 200 Area State-Approved Land Disposal Site--2004

Barnett¹,

Bergeron²,

Freeman³

2004

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show abstract

“…The nature of the geologic formations beneath the SALDS facility accounts for peculiarities in the movement of the SALDS effluent downward to the groundwater, and is described in detail by Barnett (2000). Groundwater chemical analyses indicate that the well farthest from the SALDS (699-48-77A) responds to SALDS discharges several months earlier than well 699-48-77D, and approximately 2 years earlier than in well 699-48-77C (see Section 3).…”

Section: Hydrogeologic Settingmentioning

confidence: 97%

“…The permit also requires the submission of an annual tritium-tracking report and a groundwater monitoring plan that covers the 5-year period of the permit. The current plan (Barnett 2000) provides additional guidance for selecting and reporting groundwater analyses. The results of the groundwater sampling and analysis are also reported in quarterly Discharge Monitoring Reports issued by Fluor Hanford.…”

Section: Introductionmentioning

confidence: 99%

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Results of Tritium Tracking and Groundwater Monitoring at the Hanford Site 200 Area State Approved Land Disposal SiteFiscal Year 2003

Barnett¹,

Rieger²,

Thornton³

2003

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Groundwater Monitoring and Tritium-Tracking Plan for the 200 Area State-Approved Land Disposal Site

Cited by 3 publications

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Results of Groundwater Modeling for Tritium Tracking at the Hanford Site 200 Area State-Approved Land Disposal Site--2004

Results of Groundwater Modeling for Tritium Tracking at the Hanford Site 200 Area State-Approved Land Disposal Site--2004

Results of Tritium Tracking and Groundwater Monitoring at the Hanford Site 200 Area State Approved Land Disposal SiteFiscal Year 2003

Results of Tritium Tracking and Groundwater Monitoring at the Hanford Site 200 ARea State-Approved Land Disposal Site--Fiscal Year 2002

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