Analysis of the Hydrologic Response Associated With Shutdown and Restart of the 200-ZP-1 WMA T Tank Farm Pump-and-Treat System

Spane, F.A.

doi:10.2172/975001

Cited by 4 publications

(13 citation statements)

References 26 publications

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“…As indicated in the figure, well 299-W14-14 exhibited a consistent well water-level decline pattern of ~0.35 m/year for the approximately 10-year period. This decline trend is identical to the historical trend exhibited in the WMA T Tank Farm Area located immediately to the north of WMA TX-TY, as reported in Spane (2008b). The overall decline in the unconfined aquifer water-table elevation is consistent with the decrease and cessation of wastewater disposal activities during this period within the 200-West Area and initiation of ZP-1 extraction well pumping to the south of WMA TX-TY, as discussed in Spane and Thorne (2000).…”

Section: Introductionsupporting

confidence: 80%

“…Figure 1.2 shows a generalized east-west geologic cross section of sediments in the vicinity of well 299-W15-225 (across the boundary of the WMA TX Tank Farm). As noted in Spane (2008b) and Spane and Thorne (2000), the uppermost aquifer in this general 200-West Area is unconfined and lies within Ringold Unit E. This hydrogeologic unit is reported by Lindsey (1995) to be composed of gravel, with a fine-sand matrix, and contains local sand and silt beds. These sediments are partially to well-indurated and have variable amounts of secondary mineralization.…”

Section: Introductionmentioning

confidence: 67%

“…An excellent reference for measuring, conducting, and analyzing multiwell constant-rate pumping tests is presented in Kruseman and de Ridder (2000). Examples of multi-well constant-rate pumping tests performed on the Hanford Site are presented in Spane et al (2001aSpane et al ( , 2001bSpane et al ( , and 2002 and Spane (2008b).…”

Section: Constant-rate Pumping Testmentioning

confidence: 99%

“…A detailed description of the barometric removal process is presented in Rasmussen and Crawford (1997) and Spane (1999Spane ( , 2002. Examples of its application for barometric-pressure removal from similar areal hydrologic test characterization assessments associated with neighboring ZP-1 extraction well locations are provided in Spane and Thorne (2000) and Spane (2008b).…”

Section: Barometric Effectsmentioning

confidence: 99%

“…A key element in analyzing large-scale hydrologic test response results is to quantify and remove temporal barometric pressure effects on well water-level response. As demonstrated in Spane (1999Spane ( , 2002Spane ( , 2008b and Spane and Thorne (2000), it is necessary to remove barometric effects for any quantitative, detailed analysis of multi-well constant-rate pumping tests conducted within the general 200-West Area of the Hanford Site.…”

Section: Introductionmentioning

confidence: 99%

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Field Test Report: Preliminary Aquifer Test Characterization Results for Well 299-W15-225: Supporting Phase I of the 200-ZP-1 Groundwater Operable Unit Remedial Design

Spane¹,

Newcomer²

2009

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A number of remedial action programs have been implemented on the Hanford Site that employ pump-and-treat well systems to control and treat contaminated groundwater as part of their remediation strategy. Predictive modeling and optimization of the design of large-scale pump-and-treat systems (particularly within thick unconfined aquifers), however, require additional hydrologic characterization information that is not commonly available at most extensively contaminated groundwater sites. To meet these objectives, the acquisition of large-scale hydraulic and storage properties and the vertical distribution profile of aquifer hydraulic conductivity are particularly critical in accurately modeling the performance of the pump-and-treat system. The addition of newly constructed extraction wells to a pump-and-treat system affords the opportunity to acquire both local hydraulic property versus depth profile information as well as large-scale aquifer characterization information. This hydraulic characterization information can be obtained both during well construction (i.e., selective well-depth characterization) and/or following construction of wells designed with long well-screen completions.This report examines the hydrologic test results for both local vertical profile characterization and large-scale hydrologic tests associated with a new extraction well (well 299-W15-225) that was constructed during FY2009 for inclusion within the future 200-West Area Groundwater Treatment System that is scheduled to go on-line at the end of FY2011. To facilitate the analysis of the large-scale hydrologic test performed at newly constructed extraction well 299-W15-225 (C7017; also referred to as EW-1 in some planning documents), the existing 200-ZP-1 interim pump-and-treat system was completely shut-down ~1 month before the performance of the large-scale hydrologic test. Specifically, this report 1) applies recently developed methods for removing barometric pressure fluctuations from well water-level measurements to enhance the detection of hydrologic test and pump-and-treat system effects at selected monitor wells, 2) analyzes the barometric-corrected well water-level responses for a preliminary determination of large-scale hydraulic properties, and 3) provides an assessment of the vertical distribution of hydraulic conductivity in the vicinity of newly constructed extraction well 299-W15-225. The hydrologic characterization approach presented in this report is expected to have universal application for meeting the characterization needs at other remedial action sites located within unconfined and confined aquifer systems. v Summary A final Record of Decision (EPA et al. 2008) for the 200-ZP-1 groundwater operable unit was signed by the U.S. Environmental Protection Agency (EPA), the U.S. Department of Energy (DOE), and the Washington Department of Ecology on September 30, 2008. The final selected remedy for this groundwater operable unit (OU) is a combination of pump-and-treat, monitored natural attenuation, flowpath con...

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Section: Introductionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 67%

Section: Constant-rate Pumping Testmentioning

confidence: 99%

Section: Barometric Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field Test Report: Preliminary Aquifer Test Characterization Results for Well 299-W15-225: Supporting Phase I of the 200-ZP-1 Groundwater Operable Unit Remedial Design

Spane¹,

Newcomer²

2009

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Removal of River‐Stage Fluctuations from Well Response Using Multiple Regression

Spane¹,

Mackley

2010

Groundwater

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Many contaminated unconfined aquifers are located in proximity to river systems. In groundwater studies, the physical presence of a river is commonly represented as a transient-head boundary that imposes hydrologic responses within the intersected unconfined aquifer. The periodic fluctuation of river-stage height at the boundary produces associated responses within the adjacent aquifer system, the magnitude of which is a function of the existing well, aquifer, boundary conditions, and characteristics of river-stage fluctuations. The presence of well responses induced by the river stage can significantly limit characterization and monitoring of remedial activities within the stress-impacted area. This article demonstrates the use of a time-domain, multiple-regression, convolution (superposition) method to develop well/aquifer river response function (RRF) relationships. Following RRF development, a multiple-regression deconvolution correction approach can be applied to remove river-stage effects from well water-level responses. Corrected well responses can then be analyzed to improve local aquifer characterization activities in support of optimizing remedial actions, assessing the area-of-influence of remediation activities, and determining mean groundwater flow and contaminant flux to the river system.

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Aquifer Testing Recommendations for Well 299-W15-225: Supporting Phase I of the 200-ZP-1 Groundwater Operable Unit Remedial Design

Spane¹,

Newcomer²

2009

Self Cite

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ph: (865) 576-8401 fax: (865) 576 5728 email: reports@adonis.osti.gov Available to the public from the National Technical Information Service, U.S. Department of Commerce, 5285 Port Royal Rd., Springfield, VA 22161 ph: (800) 553-6847 fax: (703) 605-6900 email: orders@nits.fedworld.gov online ordering: http://www.ntis.gov/ordering.htm SummaryAquifer characterization needs are currently being assessed to optimize pump-and-treat remedial strategies within the 200-ZP-1 Operable Unit (OU), specifically for the immediate area of the 241-TX-TY Tank Farm. Currently, 14 extraction wells are actively used in the Interim Record of Decision ZP-1 pump-and-treat system to remediate the existing groundwater contamination within this general area. Four of these wells (299-W15-40, 299-W15-43, 299-W15-44, and 299-W15-765) are targeted to remediate contamination within the immediate 241-TX-TY Tank Farm area. The major contaminant of concern (COC) for the 200-ZP-1 OU is carbon tetrachloride. Other COC's include total chromium (trivalent [III] and hexavalent [VI], nitrate, trichloroethlyene, iodine-129, technetium-99, and tritium.A new ZP-1 extraction well (299-W15-225) was identified that would be added to the pump-and-treat system. An evaluation was performed to identify characterization methods that could be implemented at the new extraction well that would significantly improve hydrologic characterization needs for this general 200-ZP-1 OU area. Hydrologic property information obtained from the new extraction well will be used to improve the design and operation of the new encompassing 200-West pump-and-treat system, as described in U.S. Department of Energy/Richland Operations (DOE/RL) (2008). The principal objectives of hydrologic characterization tests identified for the new extraction well are to determine the lateral and vertical distribution of aquifer hydraulic properties and to assess the lateral extent or area-ofinfluence of the new extraction well, 299-W15-225. This type of aquifer test characterization information is important for the detailed modeling of contaminant capture and the optimum design of pump-and-treat systems (i.e., future extraction well siting and completion).The three hydrologic test characterization methods identified for providing quantitative lateral and detailed vertical aquifer property information include:  Detailed test/depth-interval slug-test characterization during the drilling of 299-W15-225  Dynamic electromagnetic flowmeter survey within the completed new well 299-W15-225  Constant-rate pumping test of well 299-W15-225 and monitoring the large-scale areal response within surrounding and neighboring 241-TX-TY Tank Farm monitor wells.Of these test methods, the constant-rate pumping test and recovery provides an opportunity for obtaining detailed, large-scale information for a wide range of hydrologic properties (i.e., transmissivity, hydraulic conductivity, vertical and horizontal anisotropy, and storativity). Many of these properties cannot be reliably estimated using standard single-we...

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Analysis of the Hydrologic Response Associated With Shutdown and Restart of the 200-ZP-1 WMA T Tank Farm Pump-and-Treat System

Cited by 4 publications

References 26 publications

Field Test Report: Preliminary Aquifer Test Characterization Results for Well 299-W15-225: Supporting Phase I of the 200-ZP-1 Groundwater Operable Unit Remedial Design

Field Test Report: Preliminary Aquifer Test Characterization Results for Well 299-W15-225: Supporting Phase I of the 200-ZP-1 Groundwater Operable Unit Remedial Design

Removal of River‐Stage Fluctuations from Well Response Using Multiple Regression

Aquifer Testing Recommendations for Well 299-W15-225: Supporting Phase I of the 200-ZP-1 Groundwater Operable Unit Remedial Design

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