2009-06-08_REVISION - M1997032 (24)

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CNC111811on Brief Esfiinafion fPercolwlilq Through Deile%pmentRocIrAm8s Using UNSAT17 Lakewood, Colorado. These d to are included in Attachment 3. Capillary moisture data were fit to the van Genuc ten model using the program SWCC Fit (Seki 2007). The van Genutchen-Burdine r odel was used for estimation of the unsaturated hydraulic conductivity. The SVVCC Fit output files for the West Sunday and Topaz Mines are included in Attachment 1. Vapor flow was simulated using a tortuosity of 0.66 and a vapor diffusivity of 0.27 centimeter squared per second. The average soil temperature was assumed to be 283 degrees Kelvin. ¦ The model simulated (assumed to be 1968) and the Sunday and Topaz Mines. • The climate data used in the r Colorado, which is similar in regional evaluations presente direction and relative humidi data were compiled from a nc Average percent cloud cover Solar radiation data for the si Database. Other meteorologic albedo of 0.4, altitude of 1,73, 852 millibars. Climate data ar conversions) are provided in ¦ A variable flux atmospheric b gradient boundary was applil at the surface was computed the climate input files. The da assumed to be sinusoidal. A r initial conditions at all nodes.. The model was run using a 3 average precipitation year (a (1997). The initialization peri to reduce the potential effect node on the estimated percol year or the wettest year on rE Table -1 summarizes the results Mines. The corresponding UN' occurring during an average precipitation year test year on record (1997) for both the West odel includes precipitation data from Uravan, magnitude to precipitation at the site based on by Weir et al. (1983). Because wind speed, wind y data are not available for the Uravan site, these Irby weather station located in Montrose Colorado. ata were compiled from Grand Junction, Colorado. were compiled from the National Solar Radiation it parameters included in the model include an meters, and average annual atmospheric pressure of 1 solar radiation data (with appropriate unit ?ttachmen.t 1. was applied at the surface and a unit I at the bottom of the 3 meter profile. Vapor pressure ised on the daily atmospheric humidity specified in y temporal distribution of potential evaporation was itric suction of 1 x 10-7 centimeters was used for the year initialization period followed by either an umed to be 1968) and the wettest year on record 1 is based on sequential average precipitation years f initial conditions regarding the soil moisture at each ion resulting from either the average precipitation ard. F the modeling effort for the West Sunday and Topaz ,T-h output files are included in Attachment 1. • • i T:\64986-Denison Mines\Task Order 3 - DMO Sampling and Analysis Plan\Task 3.12 - Soil, Ore, Rock Data Assessment Report\Unsat_h modelsVnal modelsTinal Report\calc brief.doc