Potentiometric-surface map, 1993, Yucca Mountain and vicinity, Nevada

Tucci, Patrick; Burkhardt, D.J.

doi:10.2172/231907

Cited by 10 publications

(12 citation statements)

References 14 publications

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“…. The water table in the small gradient area in Figure 4.1 approximately matches the map of Ervin et al (1994), but the contours on the west side of the model do not agree with more recent mapping by Tucci and Burkhardt (1995) (Figure 2.2). Their 800 m isoline trends to the southwest, approximately along the 900 m contour in Figure 4.…”

Section: Dimensions and Boundariessupporting

confidence: 51%

“…Their interpolation is based on two water table elevations 6.4 and 8.8 km west of H-6 and on an estimated water level of 779 m in borehole UZ-14, located northwest of borehole H-1.The estimated water table elevation is based on a 1994 altitude of 755 m and a projected• static water level once the borehole has equilibrated after drilling. Therefore, the interpolation byTucci and Burkhardt (1995) has considerable uncertainty, so the water table contours in the large gradient zone inFigure 4.1 are used for the saturated zone model. The elevation of the top of the model in the small gradient area is centimeters to several meters different than the water table surface inFigure 2.2.…”

mentioning

confidence: 99%

“…This difference is considered negligible given the total thickness of the model. Water table calibrations for the small gradient zone were made using the small gradient defined byTucci and Burkhardt (1995).…”

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confidence: 99%

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Three-dimensional numerical modeling of the influence of faults on groundwater flow at Yucca Mountain, Nevada

Cohen

1999

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Numerical simulations of groundwater flow at Yucca Mountain, Nevada are used to investigate how the faulted hydrogeologic structure influences groundwater flow from a proposed high-level nuclear waste repository. Simulations are performed using a 3-D model that has a unique grid block discretization to accurately represent the faulted geologic units, which have variable thicknesses and orientations. Irregular grid blocks enable explicit representation of these features. Each hydrogeologic layer is discretized 1 into a single layer of irregular and dipping grid blocks, and faults are discretized such that they are laterally continuous and displacement varies along strike. In addition, the presence of altered fault zones is explicitly modeled, as appropriate. The model has 23 layers and 11 faults, and approximately 57,000 grid blocks and 200,000 grid block connections. In the past, field measurement of upward vertical head gradients and high water table temperatures near faults were interpreted as indicators of upwelling from a deep carbonate aquifer. Simulations show, however, that these features can be readily

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Section: Dimensions and Boundariessupporting

confidence: 51%

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confidence: 99%

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Three-dimensional numerical modeling of the influence of faults on groundwater flow at Yucca Mountain, Nevada

Cohen

1999

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“…Fracture permeability dominates flow in the TCw and TSw, whereas matrix permeability dominates flow in the PTn. Land surface altitudes of approximately 1200 to 1500 m and water table altitudes of 730 to 800 m (Robison, 1984;Tucci and Burkhardt, 1995) result in a total UZ thickness of 500 to 750 m (Stuckless and Dudley, 2002, p. 659). The proposed repository horizon is located in the TSw, ϳ200 to 500 m below land surface and ϳ300 m above the modern water table (U.S. Department of Energy, 2001, p. xxxiv).…”

Section: Hydrogeologic Backgroundmentioning

confidence: 99%

Improved spatial resolution for U-series dating of opal at Yucca Mountain, Nevada, USA, using ion-microprobe and microdigestion methods 1 1Associate editor: S.J.G. Galer

Paces

Neymark

Wooden

et al. 2004

Geochimica et Cosmochimica Acta

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“…These reports describe water levels measured from 1990 through 1993 and describe the 3-52 PROGRESS REPORT #15 potentiometric surface near Yucca Mountain Tucci and Burkhardt, 1995). Graves et al (1996) describes water levels for 1994.…”

Section: Flow Systemmentioning

confidence: 99%

Site characterization progress report: Yucca Mountain, Nevada. Number 15, April 1--September 30, 1996

1997

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DISTRIBUTION OF THIS DOCUMENT I S URPklMtm Washington, DC 20585 A p r i l 2 3 , 1997 NOTE TO READERS:During this reporting period, we released our revised Program Plan which outlines a focused, integrated program that will achieve key Program and statutory objectives. The plan identifies three near-term objectives: (1) updating in 1997 the regulatory framework for repository site characterization, (2) supporting a 1998 viability assessment, and (3) if the site is suitable, submitting a Secretarial site recommendation to the President in 2001 and a license application to the Nuclear Regulatory Commission in 2002. In support of the first near-term objective, we drafted a Notice of Proposed Rulemaking to amend the repository siting process. This notice was subsequently published in the Federal Register on December 16, 1996, which began a 60-day public comment period. Subsequent notices extended the comment period to May 16, 1997.Tunneling was completed in the Exploratory Studies Facility main drift, and the tunnel boring machine continued tunneling up the south ramp. In December 1996, we encountered worse ground conditions than expected, but even with these poor ground conditions, the tunnel boring machine reached the south portal on April 25,1997. The completion of the main drift marks a shift in emphasis from constructing the Exploratory Studies Facility to conducting scientific experiments in the tunnel and alcoves.The initial construction phase of the Thermal Testing Facility was completed and the first phase of the in situ heater tests began on schedule in August 1996. This eighteen month test will measure thermal effects on the rock and the moisture within the rock.Most of our site investigations and design and performance assessment activities this period were directed toward providing information for the 1998 viability assessment, our second near-term objective. Several studies and modeling activities were completed that provided new information on the potential percolation flux in the repository horizon. The new information indicated the potential for preferential water pathways and for a percolation flux higher than previously indicated.During the next period, we will continue modeling, testing, and data collection activities to reduce the uncertainty in the range of percolation flux that can be expected i? the repository horizon. In the Note to Readers for the 14th Progress Report, we indicated that we expected to issue the revised Waste Containment and Isolation Strategy during the first half of 1997. We will re-evaluate issuance of the strategy as a consequence of any changes to the predicted range c,f percolation flux rates. In addition, we will reassess the results from our on-going repository design and performance activities discussed in this progress report in light of the these same changes. 4-15Design Activity 1.1 1.3. PROGRESS REPORT #15 EXECUTIVE SUMMARYDuring the second half of fiscal year 1996, activities at the Yucca Mountain Site Characterization Proj...

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Potentiometric-surface map, 1993, Yucca Mountain and vicinity, Nevada

Cited by 10 publications

References 14 publications

Three-dimensional numerical modeling of the influence of faults on groundwater flow at Yucca Mountain, Nevada

Three-dimensional numerical modeling of the influence of faults on groundwater flow at Yucca Mountain, Nevada

Improved spatial resolution for U-series dating of opal at Yucca Mountain, Nevada, USA, using ion-microprobe and microdigestion methods 1 1Associate editor: S.J.G. Galer

Site characterization progress report: Yucca Mountain, Nevada. Number 15, April 1--September 30, 1996

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