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Table 6 Icontinued) <br /> Chemical-Specific Parameters - Physical/Chemical Properies <br /> Carbon-Water <br /> Diffusion Coefficient Sorption Coefficient Sod-Water Sorption <br /> Chemical in Water IDW (koc) Coefficient (ks)" <br /> g H201g soil <br /> (RME/default g H20/g sod <br /> cm"2/s source g H2O1g C source foc) (average foc) <br /> Benzene (USEPA)*" 1 1 E-05 ASTM 3 80E+01 ASTM 3 BOE-01 3 80E-01 <br /> Benzene (California)"* 1 1 E-05 ASTM 3 80E+01 ASTM 3 80E-01 3 BOE-01 <br /> Toluene 9 4E-06 ASTM 1 35E+02 ASTM 1 35E+00 1 35E+00 <br /> Ethylbenzene 8 5E-06 ASTM 9 55E+01 ASTM 9 55E-01 9 55E-01 <br /> Xylenes, Mixed 8 5E-06 ASTM 2 40E+02 ASTM 2 40E+00 2 40E+00 <br /> Anthracene 5 3E-06 calculate 1 40E+04 SPHEM 1 40E+02 1 40E+02 <br /> Phenanthracene 5 2E-06 calculate 1 40E+04 SPHEM 1 40E+02 1 40E+02 <br /> Pyrene 5 0E-06 calculate 3 80E+04 SPHEM 3 80E+02 3 80E+02 <br /> 1,2,4-Tnmethy1benzene 5 9£-06 calculate 3 72E+03 Mont-2 3 72E+01 3 72E+01 ` <br /> * Some or all of the values for this parameter have been calculated as follows <br /> Henry's Law Constant If H was provided in units of moles/L-atm, it was converted to the unitless H by multiplying by 41 <br /> Diffusivity in air (Dair1 4s estimated by the Fuller, Schettler, and Giddings method provided in Lyman, et al (1982) <br /> Diffusivity in Water Calculated by the Hayduk & Laudie method in Lyman, et al (1982), assumes a temperature of 16 C <br /> Soil-Water Sorption Coefficient is calculated as the fraction of organic carbon (foc) times the Kow FOC is from Table 2 <br /> ** Site-Specific Target Levels (SSTLs) have been calculated using both USEPA and California OEHHA cancer slope factors <br /> Sources <br /> ASTM - ASTM 1995 (Risk-Based Corrective Action Standard) <br /> SPHEM - USEPA 1986 (Superfund Public Health Evaluation Manual) <br /> Mont-2 Montgomery 1988 (Groundwater Chemical Handbook - Volume 2 <br /> x ImarkslSAFEWAY2 XLW Page 2 of 2 2126196 <br />