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Table 58 SUMMARY OF MULTIMED INPUT PARAMETERS AND RESULTS DISPOSAL ALTERNATIVE 2 Forward Landfill,San Joaquin County,California PARAMETER UNfTS I AREA I AREA 2 1 AREA 3 F7AREA 4 BASIS Contaminant Source Parameters Landfill Leakage Rate m/yr 9.47E-07 9.47E-07 2.47E-07 4.49E-08.._ Giroud Calculation-assumes good COA and 2 defects per unit area(See Table 2) Area of WBP Waste Placement m' 3,325 6,416 _ 3,552 1,742 Calculated assuming uniform bed ash thickness Average Annual Precipitation _ m/yr 17.9 17.9 17.9 17.9 www.usclimatedata.com/climate/stocktonicalifornia Recharge Rate m/yr_ 0.023 0.023 0.023 0.023 Assumed equal to 5 percent of annual�recipitation _ Source Decay Constant_ 1/yr NA NA NA NA NA-Duration used for analysis(see below) Years until Source Depleted _yr 17 17 17 17 Calculated(see Table 3) Spread of Contaminant Source in Derived Derived Derived Derived Derived by Model ----- Length Scale of Facility In Derived Derived I Derived I Derived Derived by Model Chemical IS=r)Parameters Initial Concentration mg/L 32 32 32 51 Maximum disposal area median concentration(see Table 2) Normalized Dist.Coefficient(KOC) _ml/B_ 0 0 0 0 Assumes no attenuation in the saturated zone Dissolved Decay Coefficient 1/yr Derived Derived Derived _Derived Derived by Model Sorted Decay Coefficient 1/yr Derived Derived Derived Derived Derived by Model Overall Aquifer Decay Coefficient 1/yr_ Derived Derived Derived Derived Derived by Model Acid Hydrolysis 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 _ 1/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 _ - -- Aquifer Distribution Coefficient ml Derived I Derived I Derived I Derived I Derived by Model Unsaturated Zone Transport and Flow Parameters Number of Layers 2 2 2 2 Layer i N/A 2 ft thick compacted clay liner Layer 2 N/A Victor Formation interbedded silty sand and sandy silt-assume all is silty sand(sandy loam) ickness mer 1 m 0.61 0.61 _ 0 61 _ 0 61 Site--s- pecific construction data Layer 2 m 9 9 9 9 A proximate distance between base of landfill and water table Vertical Saturated Hydraulic Conductivity Layer i_... _ _ _cm/hr_ 3.60E-04.. 3.60E-04 3.60E-04 3.60E-04. Com acted clay liner hydraulic conductivity specified value(IE-7 cm/set) 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 assum tion for compacted clay Layer 2 m 0 0 0 0 Conservative assumption for silty sand Residual Water Content Layer 1 _ no units 0.070 0.070 _ 0.070 0.070 Based on Sharp-Hansen et al.(1990)Table 6-0 value for silty clay Layer 2 no units 0.045 0.045 0.045 0.045 Based on Sharp-Hansen et al.(1990)Table 6-4 value for sand an Genuchten Alpha Coefficient _ Layer 1 _ 1/cm 0.005 0.005 _ 0.005_ O.OD5 _.._. 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, Based on Sharp-Hansen et al.(1990)Table 6-5 value for sand Van Genuchten Beta Coefficient