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Charissa J. Chou - One of the best experts on this subject based on the ideXlab platform.
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area A-AX at the Hanford Site
2006Co-Authors: Susan M. Narbutovskih, Charissa J. ChouAbstract:This document describes a groundwater Assessment Plan for the single-shell tank systems in Waste Management Area A-AX at the Hanford Site
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY at the Hanford Site
2001Co-Authors: Floyd N. Hodges, Charissa J. ChouAbstract:A groundwater quality Assessment Plan was prepared to investigate the rate and extent of aquifer contamination beneath Waste Management Area TX-TY on the Hanford Site in Washington State. This Plan is an update of a draft Plan issued in February 1999, which guided work performed in fiscal year 2000
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area S-SX at the Hanford Site, Interim Change Notice 1
2000Co-Authors: Vernon G. Johnson, Charissa J. ChouAbstract:This interim change notice updates groundwater quality Assessment Plan at WMA S-SX and documents completion of three new wells Planned for in the original document.
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Groundwater quality Assessment Plan for single-shell tank waste management Area U at the Hanford Site
2000Co-Authors: Floyd N. Hodges, Charissa J. ChouAbstract:Waste Management Area U (WMA U) includes the U Tank Farm, is currently regulated under RCRA interim-status regulations, and is scheduled for closure probably post-2030. Groundwater monitoring has been under an evaluation program that compared general contaminant indicator parameters from downgradient wells to background values established from upgradient wells. One of the indicator parameters, specific conductance, exceeded its background value in one downgradient well triggering a change from detection monitoring to a groundwater quality Assessment program. The objective of the first phase of this Assessment program is to determine whether the increased concentrations of nitrate and chromium in groundwater are from WMA U or from an upgradient source. Based on the results of the first determination, if WMA U is not the source of contamination, then the site will revert to detection monitoring. If WMA U is the source, then a second part of the groundwater quality Assessment Plan will be prepared to define the rate and extent of migration of contaminants in the groundwater and their concentrations.
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area S-SX at the Hanford Site
1999Co-Authors: Charissa J. Chou, Vernon G. JohnsonAbstract:A groundwater quality Assessment Plan was prepared for waste management area S-SX at the Hanford Site. Groundwater monitoring is conducted at this facility in accordance with Title 40, Code of Federal Regulation (CFR) Part 265, Subpart F [and by reference of Washington Administrative Code (WAC) 173-303-400(3)]. The facility was placed in Assessment groundwater monitoring program status after elevated waste constituents and indicator parameter measurements (i.e., chromium, technetium-99 and specific conductance) in downgradient monitoring wells were observed and confirmed. A first determination, as allowed under 40 CFR 265.93(d), provides the owner/operator of a facility an opportunity to demonstrate that the regulated unit is not the source of groundwater contamination. Based on results of the first determination it was concluded that multiple source locations in the waste management area could account for observed spatial and temporal groundwater contamination patterns. Consequently, a continued investigation is required. This Plan, developed using the data quality objectives process, is intended to comply with the continued investigation requirement. Accordingly, the primary purpose of the present Plan is to determine the rate and extent of dangerous waste (hexavalent chromium and nitrate) and radioactive constituents (e.g., technetium-99) in groundwater and to determine their concentrations in groundwater beneath waste management area S-SX. Comments and concerns expressed by the Washington State Department of Ecology on the initial waste management area S-SX Assessment report were addressed in the descriptive narrative of this Plan as well as in the Planned activities. Comment disposition is documented in a separate addendum to this Plan.
Ronald M. Smith - One of the best experts on this subject based on the ideXlab platform.
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area S-SX at the Hanford Site, Washington, Interim Change Notice 4
2007Co-Authors: Ronald M. SmithAbstract:This ICN updates the Assessment Plan to reflect the current monitoring well system and the current constituent list for WMA S-SX in compliance with RCRA Assessment monitoring
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Groundwater Quality Assessment Plan for Single-Shell Tank Waste Management Area U, Interim Change Notice 2
2006Co-Authors: Ronald M. SmithAbstract:This ICN updates the Assessment Plan to reflect the current wells in the WMA U monitoring system and to revise the analyte list. This document was prepared under the Groundwater Remediation and Closure Assessment Projects, and reflects the requirements of the Groundwater Performance Assessment Project Quality Assurance Plan (PNNL-15014).
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area S-SX at the Hanford Site, Washington, Interim Change Notice 3
2006Co-Authors: Ronald M. SmithAbstract:This ICN updates the Assessment Plan to reflect the current wells in the monitoring system and the current constituent list for WMA S-SX in compliance with RCRA Assessment monitoring. This ICN supplements all previous ICNs. This document was prepared under the Groundwater Remediation and Closure Assessment Projects, and reflects the requirements of The Groundwater Performance Assessment Project Quality Assurance Plan (PNNL-15014).
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Groundwater Quality Assessment Plan for Single-Shell Tank Waste Management Area U, Interim Change Notice 1
2003Co-Authors: Ronald M. SmithAbstract:This ICN updates the Assessment Plan to reflect the current wells in the monitoring system and the current constituent list and sampling schedule for WMA U.
Susan M. Narbutovskih - One of the best experts on this subject based on the ideXlab platform.
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area B-BX-BY at the Hanford Site
2006Co-Authors: Susan M. NarbutovskihAbstract:This document was prepared as a groundwater quality Assessment Plan revision for the single-shell tank systems in Waste Management Area B-BX-BY at the Hanford Site. Groundwater monitoring is conducted at this facility in accordance with 40 CFR Part 265, Subpart F. In FY 1996, the groundwater monitoring program was changed from detection-level indicator evaluation to a groundwater quality Assessment program when elevated specific conductance in downgradient monitoring well 299 E33-32 was confirmed by verification sampling. During the course of the ensuing investigation, elevated technetium-99 and nitrate were observed above the drinking water standard at well 299-E33-41, a well located between 241-B and 241-BX Tank Farms. Earlier observations of the groundwater contamination and tank farm leak occurrences combined with a qualitative analysis of possible solutions, led to the conclusion that waste from the waste management area had entered the groundwater and were observed in this well. Based on 40 CFR 265.93 [d] paragraph (7), the owner-operator must continue to make the minimum required determinations of contaminant level and rate/extent of migrations on a quarterly basis until final facility closure. These continued determinations are required because the groundwater quality Assessment was implemented prior to final closure of the facility
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area A-AX at the Hanford Site
2006Co-Authors: Susan M. Narbutovskih, Charissa J. ChouAbstract:This document describes a groundwater Assessment Plan for the single-shell tank systems in Waste Management Area A-AX at the Hanford Site
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Groundwater Quality Assessment Plan for Single-Shell Tank Waste Management Area B-BX-BY at the Hanford Site, Interim Change Notice 1
2002Co-Authors: Susan M. NarbutovskihAbstract:This ICN updates the Assessment Plan to reflect the addition of wells newly installed in FY2001. Project scientists will provide a schedule change request identifying the wells as new and providing a list of constituents and sample frequencies to the sample scheduler.
Duane G. Horton - One of the best experts on this subject based on the ideXlab platform.
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY
2007Co-Authors: Duane G. HortonAbstract:WMA TX-TY contains underground, single-shell tanks that were used to store liquid waste that contained chemicals and radionuclides. Most of the liquid has been removed, and the remaining waste is regulated under the RCRA as modi¬fied in 40 CFR Part 265, Subpart F and Washington State’s Hazardous Waste Management Act . WMA TX-TY was placed in Assessment monitoring in 1993 because of elevated specific conductance. A groundwater quality Assessment Plan was written in 1993 describing the monitoring activities to be used in deciding whether WMA TX-TY had affected groundwater. That Plan was updated in 2001 for continued RCRA groundwater quality Assessment as required by 40 CFR 265.93 (d)(7). This document further updates the Assessment Plan for WMA TX-TY by including (1) information obtained from ten new wells installed at the WMA after 1999 and (2) information from routine quarterly groundwater monitoring during the last five years. Also, this Plan describes activities for continuing the groundwater Assessment at WMA TX TY
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY at the Hanford Site, Interim Change Notice 1
2002Co-Authors: Duane G. HortonAbstract:This interim change notice updates the Assessment Plan to reflect the current wells in the monitoring system and the current constituent list for Waste Management Area TX-TY.
Vernon G. Johnson - One of the best experts on this subject based on the ideXlab platform.
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area S-SX at the Hanford Site, Interim Change Notice 1
2000Co-Authors: Vernon G. Johnson, Charissa J. ChouAbstract:This interim change notice updates groundwater quality Assessment Plan at WMA S-SX and documents completion of three new wells Planned for in the original document.
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RCRA Assessment Plan for Single-Shell Tank Waste Management Area S-SX at the Hanford Site
1999Co-Authors: Charissa J. Chou, Vernon G. JohnsonAbstract:A groundwater quality Assessment Plan was prepared for waste management area S-SX at the Hanford Site. Groundwater monitoring is conducted at this facility in accordance with Title 40, Code of Federal Regulation (CFR) Part 265, Subpart F [and by reference of Washington Administrative Code (WAC) 173-303-400(3)]. The facility was placed in Assessment groundwater monitoring program status after elevated waste constituents and indicator parameter measurements (i.e., chromium, technetium-99 and specific conductance) in downgradient monitoring wells were observed and confirmed. A first determination, as allowed under 40 CFR 265.93(d), provides the owner/operator of a facility an opportunity to demonstrate that the regulated unit is not the source of groundwater contamination. Based on results of the first determination it was concluded that multiple source locations in the waste management area could account for observed spatial and temporal groundwater contamination patterns. Consequently, a continued investigation is required. This Plan, developed using the data quality objectives process, is intended to comply with the continued investigation requirement. Accordingly, the primary purpose of the present Plan is to determine the rate and extent of dangerous waste (hexavalent chromium and nitrate) and radioactive constituents (e.g., technetium-99) in groundwater and to determine their concentrations in groundwater beneath waste management area S-SX. Comments and concerns expressed by the Washington State Department of Ecology on the initial waste management area S-SX Assessment report were addressed in the descriptive narrative of this Plan as well as in the Planned activities. Comment disposition is documented in a separate addendum to this Plan.
