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Other parameter values common to all model runs are listed below <br /> Soil density 15 gm/cubic cm <br /> Disconnectedness index 50 <br /> Cation exchange capacity 0 <br /> Freundlich exponent I <br /> Years simulated 10 <br /> Area of application of <br />' pollutant 372,000 square an <br /> Initial pollutant <br /> concentration <br /> in layer 2 30 ggm/m1 (20 mg/kg)ethylbenzene <br /> Saturated hydraulic <br /> conductivity 10 cm/day <br /> Horizontal hydraulic <br /> gradient 00025 <br /> Thickness of saturated zone 457 cm <br /> Width of contaminated zone <br /> perpendicular to flow 2440 cm <br /> Background contaminant <br /> concentration in <br /> aquifer 0 006 pgm/ml <br /> Three model simulations were carried out The first, LODI RUN 1, used parameter values that are <br /> considered to be the most realistic available LODI RUN 2, which represents a hypothetical <br /> "worst case" scenario, used parameter values that would tend to show advanced contaminant <br /> transport, compared to a more realistic case LODI RUN 3, wluch represents a hypothetical "best <br /> case" scenario, used parameter values that would tend to show retarded contaminant transport, <br /> relative to a more realistic case Parameter values unique to the various computer runs are given <br /> below <br /> RUN 1 RUN 2 RUN 3 <br /> (Realistic) (Worst Case) (Best Case) <br /> Intrinsic permeability l E-9 IE-8 IE-10 <br /> (square cm) <br /> Effective porosity 025 0 15 025 <br />' Organic carbon <br /> content(%) 02 01 03 <br /> Biodegradation rate <br /> (0/./day) 0 002 0 0 004 <br /> 10 <br />