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` <br /> ` <br /> TABLE <br /> B|OSCREENINPUT PARAMETERS <br /> Former Fayette Manufacturing Facility <br /> 7G75West Eleventh Street <br /> Tracy, CA <br /> Hydrogeology Hydraulic Conductivity 4.6 x 10-4(cm/sec) Estimated <br /> Hydraulic Gradient 0.003 ft/ft Static water level measurements <br /> Porosity 0.12 Estimated <br /> Dispersion Longitudinal Dispersivity 8.4(ft) Based on estimated plume length of 130 ft. <br /> Transverse Dispersivity 0.8(ft) (dist. from source to estimated edge of <br /> Vertical Dispersivity 0(ft) plume)and Xu/Eckstein relationship <br /> Absorption Retardation Factor: 1.5 Calculated from <br /> Soil Bulk Density pb: 1.70 (kg/L) Lab analysis (Ave) <br /> foc: 0.001% Literature-use foc 0.001 <br /> Koc: B: 38 T-. 135 Literature-use Koc 38 <br /> Biodegradation Electron Acceptor: 02 NO3 SO4 Based on March 1997 <br /> Minimum Conc. (mglL): 1.0 18 260 conducted by ATC Associates, <br /> Background Conc. (mg/L): 1.5 23 280 groundwater sampling programElectron Acceptor: Fe *CH4 *CH4 Conc. based on <br /> Note: Bold values are <br /> BIOSCREEN input values <br /> General Modeled Area Length: 150(ft) Length based on approximate distance <br /> Modeled Area Width: 60(ft) from contaminant source to the observable <br /> Simulation Time: 11 and 36(yrs) down gradient edge of the plume. Assumes <br /> a steady-state flow. <br /> Source Data Source Thickness: 3(ft) Based on geologic logs and <br /> Source Concentration: 13 mg/L lumped BTEX monitoring data <br /> Actual Data Distance From Source (ft): 15 45 120 Based on observed December 1997 <br /> Benzene Conc. (mg/L): 1.3 0.17 0.002 concentrations at site <br /> OUTPUT Centerline Concentration: See Figure 6 <br /> Array Concentration: See Figure 7 <br /> ~~�' <br />