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Table SA SUMMARY OF MULTIMED INPUT PARAMETERS AND RESULTS DISPOSAL ALTERNATIVE 1 forward Landfill,San 1oa In CouMy,California PARAMETER UNITS AREA 1 AREA 2 AREA 3 AREA 4 BASIS Contaminant Source Parameters Landfill Leaka eRate_ ______ _.__ mom__ 3.13E-05... 6.03E-05 3.34E-05 1.64E-05 Giroud Caiculation-assumessood CQAand2defects perunitarea(See Tabie2) Area of WBP Waste Placement mz 39,906 76,997 42,622 20,907 Calculated assuming uniform bed ash thickness Average Annual Precipitation ....____ m/yr 17.9 _ 17.9 _ 17.9 17.9 mat lifornia Rechar a Rate _____, m/yr _ 0_023 0.023 0.023 0me .023 Assumed a ual to 5 percent of annual precipitation Source Decay Constant 1/yr NA NA NA NA NA-Duration used for analysis(see below) Duration of Leakage yr 0.53 0.27 0.15 0.05 Calculated(see Table 3) Spread of Contaminant Source m Derived Derived Derived Derived Derived by Model - -_.._------ __ __ —__. — .._.__.._.. ---.__. ...___ ... _-- Len th Scale of Facilitym Derived Derived Derived Derived Derived by Model Chemical(Co; r)Parameters nitial Concentration _mg/L 32 32 32 51 Maximum dis sal area median concentration(see Table 1) Normalized Dist.Coefficient(KOC) ml/g 0 0 0 0 Assumes no attenuation in the saturated zone Dissolved Decay Coefficient 1/yr Derived Derived Derived Derived Derived b Model rd Decay Coefficient 1/yr Derived Derived_ Derived Derived Derived by Model Overall Aquifer Decay Coefficient 1/yr Derived Derived Derived Derived Derived by Model cid H drol sis Rate __I/mole-yr _____0 0 0 0 Conservative-assumes no attenuation not significant for copper Neutral Hydrolysis Rate 1/yr _0 0 0 0 Conservative-assumes no attenuation(not significant for copper) _. Base Hydrolysis Rate I/mole-yr 0 0 0 0 Conservative-assumes no attenuation(not significant for copper) Hydrolysis Reference Temperature __ deg C 25 25 25 25 Model-specified uifer Distribution Coefficient ml Derived Derived 1 Derived Derived Derived b Model Unsaturated Zone Trans rt and flow Parameters Number of Layers 2 2 2 2 Layer 1 _ N/A_ 2 f,thick compacted clay liner Layer 2 N/A Victor Formation interbedded silty sand and sandy silt-assume all is silty sand(sandy loam) hickness ------061 Layer 1 m 0.61 0.61 0.61 0.6161 _ Site-specific construction data Layer 2 m 9 9 9 9Ap roximate distance between base of landfill and water table Vertical Saturated Hydraulic Conductivity Layer 1 _ cm/hr 3.60E-04 3.60E-04 3.60E-04 3.60E-04 Compaded clay liner hydraulic conductivity specified value(1E-7 cm/sec) Layer 2 cm/hr 0.72 0.72 0.72 0.72 Victor Formation slug tests indicate 2E-02 to 2E-03 cm/sec(Assume vertical=horizontal/10) Effective Porosity Layer 1 no units 0.42 0.42 0.42 0.42 Based on Sharp-Hansen et al.(1990)Table 6-3 value for clay Layer 2 no units 0.43 0.43 0.43-- __ 0.43 __Based on Sharp-Hansen et al.(1990)Table 6-3 value for sand Air Entry Pressure Head Layer 1 m 0 0 0 0 Conservative assumption for compacted clay Layer2 _ _._ in 0 0 0 _ 0 Conservative assumption for silt sand and Residual Water Content Layer 1 no units 0.070 0.070 0.070 _ 0.070 Based on Shar-Hansen et al.(1990)Table 6-4 value for silty clay -- — ---..._._ — .... -- __. ._— Layer 2 no units 0.045 0.045 0.045 0.045 Based on Shar-Hansen et al.(1990)Table 6-4 value for sand Van Genuchten Alpha Coefficient _ Layer 1 1/cm 0.005 0.005 0.005 0.005 Based on Sharp-Hansen et al.(1990)Table 6-5 value for silty clay Layer 2 1/cm 0.145 0.145 0.145 0.145 lBasedonSharp-Hansen et al.(1990)Table-j:5 value for sand an Genuchten Beta Coefficient