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C; <br />C <br />Table SA <br />SUMMARY <br />OF <br />MULTIMED INPUT PARAMETERS AND RESULTS <br />DISPOSAL ALTERNATIVE I <br />Forward Landfill, San Joaquin County, California <br />PARAMETER <br />UNITS <br />AREA 1 <br />AREA 2 <br />1 AREA 3 1 <br />AREA 4 1 <br />BASIS <br />Contaminant Source Parameters <br />Landfill Leakage Rate <br />m/yr <br />3.13E-05 <br />6.03E-05 <br />3.34E-05 <br />1.64E-05 <br />Giroud Calculation - assumes good COA and 2 defects per unit area (See Table 2) <br />Area of W BP Waste Placement <br />m' <br />39,906 <br />76,997 <br />42,622 <br />20,907 <br />Calculated assuming uniform bed ash thickness <br />vera,e Annual Precipitation _ <br />in/yr <br />17.9 <br />17.9 <br />17.9 <br />179 <br />www.uscilmatedata,com/climate/stockton/california _ <br />Recharge Rate <br />m/yr _ <br />0,023 <br />_ 0.023 <br />0.023 <br />0.023 <br />Assumed equal to 5 percent of annual precipitation <br />Source Decay Constant <br />1/yr <br />NA <br />NA <br />NA <br />NA <br />NA - Duration used for analysis (see below) <br />Duration of Leakage <br />yr <br />0.53 <br />0.27 <br />0.15 <br />0.05 <br />Calculated (see Table 3) <br />Spread of Contaminant Source <br />m <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model <br />Len th Scale of Facilitym <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived b Model <br />Chemical Coper) <br />Parameters <br />Initial Concentration <br />mg/L <br />32 <br />32 <br />32 <br />51 <br />Maximum disposal area median concentration (see Table 1) <br />0 <br />0 <br />0 <br />0 <br />Assumes no attenuation in the saturated zone <br />Normalized Dist. Coefficient (KOC) ml/g <br />Dissolved Decay Coefficient <br />1/yr <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model <br />orbed Decay Coefficient <br />1/yr <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model <br />Overall Aquifer Decay Coefficient <br />1/yr <br />Derived <br />Derived <br />Derived <br />Derived <br />Derived by Model <br />Acid Hydrol sis Rate <br />I/mole yr <br />0 <br />0 <br />0 <br />0 <br />Conservative assumes no attenuation not significant for topper) <br />Neutral Hydrolysis Rate <br />1/yr <br />0 <br />0 <br />0 <br />0 <br />Conservative - assumes no attenuation (not significant for copper) <br />Base Hydrolysis Rate <br />I/mole-yr <br />0 <br />0 <br />0 <br />_ _ <br />0 <br />Conservative -assumes no attenuation (not significant for copper) <br />Hydrolysis Reference Temperature <br />deg C <br />_ 25 _ <br />Derived <br />25 <br />Derived <br />25 <br />Derived <br />25 <br />Derived <br />Model -specified <br />Derived b Model <br />Aquifer Distribution Coefficient mI/g <br />Unsaturated Zone Trans ort and Flow Parameters <br />Number of Layers <br />2 <br />2 <br />2 <br />2 <br />Layer 1 <br />N/A <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 />0.61 <br />Site-specific construction data <br />11 <br />Layer 2 <br />in <br />9 <br />9 <br />9 <br />9 <br />_ <br />Approximate distance between base of landfill and water table <br />ertical Saturated Hydraulic Conductivity <br />--___. <br />_ —.. <br />_ <br />......__. .....------- <br />_-- <br />Layer 1 <br />cm/hr <br />3.60E-04 <br />3.6_0E-04 <br />3.60E-04 <br />3.60E-04 <br />Comparted_clay.liner—hydraul—k_conductivity.specified value— (lE-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 al. (1990) Table 6-3 value for sand <br />Air Entry Pressure Head <br />Lamer 1 <br />in <br />0 <br />0 <br />0 <br />0 <br />Conservative assumption for co---mpaqed clay <br />_. <br />Layer <br />in <br />0 <br />0 <br />0 <br />0 <br />Conservativeassumtion 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 64 value for silty clay <br />Layer 2 <br />no units <br />0.045 <br />0.045 <br />0.045 <br />0.045 <br />Based on Shar -Hansen et al. (1990) Table 6-4 value for sand <br />Van Genuchten Alpha Coefficient <br />Layer 1.._ _. <br />1/cm <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 />1/cm <br />0.145 <br />_..__ <br />0.145 <br />_0.005 <br />t0:145 <br />_ <br />0.145 <br />Layer 2 <br />Based on Sharp -Hansen et al. (1990) Table 6-5 value for sand <br />Van Genuchten Beta Coefficient <br />_ <br />