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Table SS SUMMARY Of MULTIMED INPUT PARAMETERS AND RESULTS DISPOSAL ALTERNATIVE 2 Forward Landfill,San Joaquin County,California PARAMETER UNITS AREA 1 AREA 2 AREA 3 AREA 4 BASIS Layer 1 no units 1.09 1.09 1.09 1.09 Based on Sharp-Hansen et al.(1990)Table 6-5 value for silty clay Layer 2 no units 2.68 2.68 2.68 2.68 Based on Sharp-Hansen et al.(1990)Table 6-5 value for sand Organic Matter _ ._ ___...__. _ _ Layer 1 percent 0 0 0 0 Conservative assumption(does not allow model attenuation) Layer 2 percent 0 0 0 0 Conservative assumption(does not allow model attenuation) Bulk Density Layer 1 g/cm3 1.8 1.8 1.8 1.8 Site data(dry soil) Layer 2 g/cm' 1.7 1.7 1.7 1.7 Median site data(dry soil) logi Biocal Decay Coefficient Layer 1 _1/yr _. _ 0 0 0 0 Conservative assumption(not significant for copper! Layer 2 1 r 0 0 0 0 Conservative assumption not significant for copper) Groundwater nsportParameters Aquifer Thickness m 12.2 12.2 12.2 12.2 Site data(Andrew Eng/Herst Revised EFS and Annual Corrective Action Reports) Effective Porosity no units 0.35 0.35 0.35 0.35 Site data or estimate for uppermost saturated zone Bulk Density g/tm' 1.7 1.7 1.7 1.7 Median site data(dry soil) Mixing Zone Thickness m Derived Derived Derived Derived Derived by Model Mean Particle Diameter cm 0.02 0.02 0.02 _ 0.02 Average of site grain size data Hydraulic Conductivity m/yr 1.89E+03._ 1.89E+03 1.89E+03 1.89E+03 Based on Victor Formation slug tests(2E-02 to 2E-03 cm/sec) Gradient m/m 0.002 0.002 0.002 0.002 Median site data(see Figure 1) Seepage Velocity m/yr Derived Derived Derived Derived Calculated by Model Retardation Coefficient no units Derived Derived Derhetcli erived Derived by Model Vertical Dispersiwty m Derived Derived Derived Derived Derived by Model Transverse Dispersivity m Derived Derived Derived Derived Derived by Model Aquifer Temperature °C 19 19 19 19 Average site monitoring data PH units 7.3 7.3 7.3 7.3 Median site monitoring data Fraction Or anic Carbon no units 0 0 0 0 Conservative assumption(does not allow model attenuation) Radial Distance to Well m 213 165 332 205 Measure from center of assumed disposal area to closest downgradient monitoring well An le Off Gradient Azis degrees 0 0 _ 0 0 Assumed to be directly downgradient from the source Well Screen Depth Fraction no units 0.23 0.23 0.50 0.50 Site-s etific ratio of screen length to depth of uppermost saturated zone Results Predicted Maximum Well Concentration mg/L 5.46E-10 1.04E-09 2.90E-11 6.92E-13 ransient Dilution Attenuation Factor no units 5.86E+10 3.09E+10 1.09E+12 7.37E+13 Ratio Initial Concentration:Detected Concentration Time Required to Reach Maximum yrs 679,000 679,000 2,570,000 14,000,000 pical Copper Detection Limit __-1mVL .,0.0011 _. 0.0011, 0.0011 0.0011__ Detectable no units NO NO NO NO Multi le Required for Detection no units 2 035 390 1062,802 37,931 034 1,589 136,088