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C <br />Table 58 <br />SUMMARY OF <br />MULTIMED INPUT PARAMETERS AND RESULTS <br />DISPOSAL <br />ALTERNATIVE 2 <br />Forward Landfill, San <br />Joaquin County, <br />California <br />PARAMETER <br />UNITS <br />AREA 1 <br />AREA 2 1 <br />AREA 3 1 <br />AREA 4 <br />BASIS <br />Contaminant Source Parameters <br />Landfill Leakage Rate <br />m/yr <br />9.47E-07 <br />9.47E-07 <br />2.47E-07 <br />4.49E-08 <br />Giroud Calculation - assumes good CQA and 2 defects per unit area (See Table 2) _ <br />Area of WBP Waste Placement <br />mz <br />3,325 <br />6,416 <br />3,552 <br />1,742 <br />Calculated assuming uniform bed ash thickness <br />Average Annual Precipitation <br />in/yr <br />179 <br />_ 17.9 <br />17.9 <br />17.9 <br />2fWW.usglimatedata.com/climate/`stockton/california _. <br />Recharge Rate <br />m/yr <br />0 023 <br />0.023 <br />NA <br />0.023 <br />NA <br />0.023 <br />NA <br />Assumed equal to 5 percent of annual precipitation <br />NA - Duration used for analysis (see below) _ <br />Source Decay Constant 1/yr NA <br />Years until Source Depleted <br />yr <br />_ <br />17 <br />17 <br />17 <br />17 <br />Calculated (see Table 3) <br />Sp_read of Contaminant Source <br />m <br />Derived <br />Derived <br />_ Derived <br />Derived <br />Derived by Model _ <br />len th Scale of Facility <br />m <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model <br />Chemical Co r Parameters <br />Initial Concentration <br />mg/L <br />32 <br />32 <br />32 <br />51 <br />Maximum disposal area median concentration (see Table 2) <br />Normalized Dist Coefficient (KOC) <br />ml/g <br />0 <br />0 <br />0 <br />0 <br />Assumes no attenuation in the saturated zone <br />Dissolved Decay Coefficient <br />1/yr <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model -- ---- -- -_ _.. <br />-- —.._f_......._ _--------- <br />Sorbed Decay Coefficient <br />1/yr <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model _ <br />Overali Aquifer Decay Coefficient <br />1/yr <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model <br />cid�drol semis Rate <br />I/mole-yr <br />0 <br />_ <br />0 <br />0 <br />0 <br />Conservative - assumes no attenuation (not significant for copper) <br />0 <br />Conservative - assumes no attenuation (not significant for copper) <br />_ <br />Neutral Hydrolysis Rate 1/yr 0 0 <br />0 <br />Base Hydrolysis Rate <br />I/mole-yr <br />0 <br />_ <br />0 <br />_ <br />0 <br />0 <br />Conservative - assumes no attenuation (not significant for copper) <br />Hydrolysis Reference Temperature <br />_ <br />deg C <br />25 <br />_ <br />25 <br />25 <br />25 _ <br />Model -specified _.. <br />Aquifer Distribution Coefficient <br />ml/g <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model <br />Unsaturated <br />Zone Transport <br />and Flow Parameters <br />Number of Layers <br />2 <br />2 <br />2 <br />2 <br />Layer I <br />_ <br />N/A <br />_ <br />_. <br />2 ft thick compacted clay liner <br />Layer 2 <br />N/A <br />Victor Formation interbedded silty sand and sandy silt - assume all is silty sand (sandy loam) <br />Thickness <br />Layer 1 _ <br />m <br />0.61 <br />0.61 <br />0.61 <br />0.61Site-�ecific <br />construction data <br />_ <br />m <br />9 <br />9 <br />9 <br />9 <br />Approximate distance between base of landfill and water table <br />Layer 2 <br />Vertical Saturated Hydraulic Conductivity <br />Layer 1 <br />cm/hr <br />3.60E-04 <br />_3.6 04 0E - <br />3.60E-04 <br />3.60E-04 <br />Compacted clay liner hydraulic conductrvity specified value (3E-7 cm/sec) <br />Layer 2 <br />cm/hr <br />0.72 <br />0.72 <br />0.72 <br />0.72 <br />Victor Formation slug tests indicate 2E-02 to 2E-03 cm/sec (Assume vertical = horizontal/10) <br />Effective Porosity <br />Layer 1 <br />no units <br />_ 0.42 <br />_ _ 0.42 _ <br />_ 0-42 _ <br />0.42---- _ <br />Based on Sharp -Hansen et al. (1990) Table 6-3 value for clay <br />Layer 2 <br />no units <br />0.43 _ <br />_ 0.43 _ <br />0.43 <br />0.43 <br />Based on Sharp -Hansen et a_L_ (1990), Table 6-3 value for sand <br />Air Entry Pressure Head <br />Layer 1 <br />in <br />0 <br />0 <br />0 <br />0 <br />Conservative assumption for compacted clay <br />Layer 2__ , <br />m <br />0 <br />0 <br />0 <br />0 <br />Conservative assumption for silty sand <br />Residual Water Content <br />Layer 1 <br />no units <br />0.070 <br />0.070 <br />0.070 <br />0.070 <br />Based on Sharp -Hansen et al. (1990) Table 6-4 value for silty clay <br />0.045 <br />Based on Sharp -Hansen et al. (1990) Table 6-4 value for sand_ _.._ <br />Layer 2 <br />no units <br />0.045 <br />0.045 0.045 <br />Van Genuchten Alpha Coefficient <br />Layer 1 _ _. <br />_ 1/cm <br />_ 0.005 <br />_ <br />0.005 <br />0.005 <br />0.005 <br />Based on Sharp -Hansen et al. (1990) Table 6-5 value for silty clay <br />Layer 2 __ _. _ _ <br />1/cm <br />0 145 <br />0.145 <br />0.145 <br />_ 0.145 _ <br />Based on Sharp -Hansen et al. (1990) Table 6-5 value for sand <br />an Genuchten Beta Coefficient <br />