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Table 2 <br /> AT123D Groundwater Modeling Input Parameters <br /> COC Migration Evaluation <br /> • Chevron Fuel Terminal 100-1621 <br /> 22888 Kasson Road <br /> Banta, California <br /> Model Parameters <br /> MtBE TPH9 d <br /> Slmulatlon <br /> Years of simulation 5,30 5,30 5,30,60 <br /> Model in ut Parameters <br /> Assumed Soil Lithology Sand Sand Sand <br /> Hydraulic conductivity(m/hr)b 0.2 0.2 0.2 <br /> Soil bulk density(kg/m3)c 1,380 1,380 1,380 <br /> Effective soil porosity° 0.3 0.3 0.3 <br /> Dispersivity(Longitudinal/TransverseNertical)" 20/5/0.1 m 20/5/0.1 m 20/5/0.1 m <br /> Organic carbon content'fog a 0.01 0.01 0.01 <br /> Organic carbon partition coefficient(koc) 5.258 l./kg1 .00064-.36 m3/kge .01 -50 m3/kga <br /> Adsorption coefficient on soil'Kd' 5.7E-09 .0036 m3/kg .005 m3/kg <br /> Decay Constant .00092/h? .00032/hr1 .00008/hr1 <br /> Horizontal hydraulic gradientk 0.04 0.04 0.04 <br /> Source(Waste)Release Rate(kg/hr) 0.5 0.1 10 <br /> Source Area(m) 2,000 2,000 600 <br /> Abbreviations: <br /> g=grams;mg=milligrams;kg=kilograms;L=liter;sec=second;h=hours;m=meters;yr=years <br /> Footnotes: <br /> Based on information from soil borings <br /> b Based on information from site aquifer testing(SECOR 2003) <br /> e Based on mean literature value presented for sand in AT123D <br /> Based on literature values presented in ATI 23D and Freeze,Cherry, 1979 <br /> Assumed <br /> 1 Based on literature value from RAIS <br /> ° Based on literature value from AEHS <br /> Based on KD=Koc'foc <br /> 1 Based on half-life of MTBE presented in Howard, 1991 <br /> 1 Based on half-lives of selected TPHg and TPHd constituents(Howard, 1991) <br /> k Based on site specific data <br /> "Recommended default value from Yeh(1981). <br /> °Default value from USEPA(1996). <br /> P From USEPA(1996). <br /> Additional References: <br /> Yeh. 1981.AT123D:Analytical Transient One-Two-,and Three-Dimensional Simulation of Waste Transport in the Aquifer System <br /> -Yeh,G.T.,Environmental Sciences Division, ORNL,TN.Publication No. 1439 <br /> Javendel et al. 1988.ODAST-One-Dimensional Analytical Solute Transport Model-I.Javandel,C.Doughty,C.F.Tsang, <br /> Groundwater Transport:Handbook of Mathematical Models,American Geophysical Union,Water Resources Monograph Series 10 <br /> Oak Ridge National Laboratory(ORNL).2000.Risk Assessment Information System(RAIS).On-line database: <br /> http://risk.Isd.ornl.gov/cgi-bin/tox[TOX_select?select=csf. <br /> • <br /> M:\Pmjecta\Ti \Ric}uwnd\Repo t\chev ntabl"I\Table C-3 Page 1 of 1 7/2 M3,2:31 PM <br />