Robert Andrews - US Nuclear Waste Technical Review Board

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Regional Hydrogeology • Regional groundwater flow system investigated by USGS and other scientists for 20+ years • Regional groundwater flow characterized by representations of – relevant physiographic features, – recharge/discharge locations/amounts, – regional geology, – regional potentiometric surfaces and – regional geochemistry • Result of regional characterization indicates general groundwater flow paths and flow rates in vicinity of Yucca Mountain 00414PR_SZ_NRC_Andrews.ppt 8
Major Physiographic Features of Death Valley Regional Flow System • Death valley region encompasses about 70,000 km 2 • Major features include Spring Mountains, Death Valley, and Amargosa Valley • Region is an enclosed hydrologic basin • Different boundaries used for different regional modeling studies 00414PR_SZ_NRC_Andrews.ppt 9
Page 1 and 2: U.S. Department of Energy Office of
Page 3 and 4: Components Affecting Technical Basi
Page 5 and 6: Introduction - Performance Assessme
Page 7: Conceptual Framework for Saturated
Page 11 and 12: Cumulative Recharge Estimates in De
Page 13 and 14: Discharge Locations in Death Valley
Page 15 and 16: Groundwater Withdrawals in the Deat
Page 17 and 18: Potentiometric Surface of Death Val
Page 19 and 20: Geochemistry Signatures and Inferre
Page 21 and 22: Regional Variation in Uranium and U
Page 23 and 24: Comparison of Inferred and Simulate
Page 25 and 26: Boreholes used in the Development o
Page 27 and 28: Site Scale Geologic Representation
Page 29 and 30: Extent of Alluvium Identified in Ny
Page 31 and 32: Site Scale Boundary Fluxes Compared
Page 33 and 34: C-Wells Stratigraphy and Hydraulic
Page 35 and 36: Site Scale Modeled and Observed Pot
Page 37 and 38: Calculated Site Scale Groundwater F
Page 39 and 40: UTM Northing (m) 4090000 4085000 40
Page 41 and 42: Site Scale Radionuclide Transport
Page 43 and 44: Matrix Diffusion Coefficient Evalua
Page 45 and 46: Single Hole Tracer Test at Alluvial
Page 47 and 48: Carbon-14 versus Delta Carbon-13
Page 49 and 50: Sorption of Radionuclides on Alluvi
Page 51 and 52: Calculated Radionuclide Breakthroug
Page 53 and 54: Calculated Radionuclide Breakthroug
Page 55 and 56: Comparison to Alternative Represent
Page 57 and 58: NRC/CNWRA Transport Model Results
Page 59 and 60:
Summary and Conclusions - Radionucl
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Robert Andrews - US Nuclear Waste Technical Review Board

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