Robert Andrews - US Nuclear Waste Technical Review Board

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Major Recharge within Death Valley Regional Flow System • Recharge generally occurs at topograpphic elevations greater than 1500 m asl • Recharge a function of precipitation, slope, geology, and vegetation • Uncertainty in recharge depending on estimation method 00414PR_SZ_NRC_<strong>Andrews</strong>.ppt 10
Cumulative Recharge Estimates in Death Valley Regional Flow System Precipitation Model 1980 to 1995 Modeled Precipitation 1920 to 1993 Cokriged Precipitation Model Type Average Value for Area of Death Valley Groundwater Flow Model (mm/yr) Total Area Volume (million m 3 /yr) Net Infiltration or Recharge as a Percentage of Precipitation 202 7,980 ⎯ Model net infiltration 7.8 310 3.9 Model net infiltration of areas with >200 mm/yr precipitation Modified Maxey- Eakin estimated recharge Modified Maxey- Eakin of areas with >200 mm/yr precipitation Original Maxey- Eakin estimated recharge Modified Maxey- Eakin estimated recharge Original Maxey- Eakin estimated recharge 4.8 190 6.2 6.3 250 3.1 2.6 110 5.1 4.8 190 2.4 188 7,430 ⎯ 5.1 200 2.7 3.7 150 2.0 Source: Based on Hevesi et al. 2002 , Table 2). NOTE: Volumetric flows rounded to the nearest 10 million m 3 /yr. 00414PR_SZ_NRC_<strong>Andrews</strong>.ppt 11
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 and 8: Conceptual Framework for Saturated
Page 9: Major Physiographic Features of Dea
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

Robert Andrews - US Nuclear Waste Technical Review Board

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