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Table SA SUMMARY OF MULTIMEO INPUT PARAMETERS AND RESULTS DISPOSAL ALTERNATIVE 1 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 Organic Matteno units 2.68 2.68 2.68 2.68 Based on Sharp-Hansen et al.(1990)Table 6-5 value for sand _ 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 ttenuation)_ BulkDensi Layer i g/cm 1.8 1.8 1.8 1.8 Site data(dry soil) Layer 2 g/cm3 1.7 1.7 1.7 1.7 Median site data(dry soil) Biological Decay Coefficient Layer 1_ er) 1/yr 0 0 0 0 Conservative assumption(not significant for copp La er 2 T 1/yr 0 0 0 0Conservative assumption not significant for copper) Groundwater Transport Parameters 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/cm3 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 129E+03 Based on Victor Formation slug tests(2E-02 to 2E-03 cm/sec) Gradient _ m/m 0.002 OM 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 Derived Derived Derived by Model Vertical Dispersivity m Derived Derived Derived Derived Derived by Model ransverse 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 Organic Carbon no units 0 0 0 0 Conservative assumption(does not allow model attenuation) Radial Distance to Well in 213 165 332 205 Measure from center of assumed disposal area to closest downgradient monitoring well An le Off Gradient Axis 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-specific:ratio of screen length to depth of uppermost saturated zone Results Predicted Maximum Well Concentration mg/L 1.77E-07 5.60E-07 4.08E-08 8.21E-09 Transient Dilution Attenuation Factor no units 1.81E+08 5.72E+07 7.73E+08 6.21E+09 Ratio Initial Concentration:Detected Concentration Time Required to Reach Maximum yrs__ 22,000 11,600 20,600 41,200 ypical Copper,Detection Limit m L _ 0.0011 _0.0011 _ 0.0011 _0.0011 Detectable no units NO NO NO NO Multi le Re wired for Detection no units 6 211 1,965 26,981 133,983