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7W Table 6 Chemical-Specific Parameters - Physical/Chemical Properies Molecular Weight Henry's Law Diffusion Coefficient in Chemical (MW) Water Solubility (WS) Vapor Pressure (VP) Constant IH)* Air (Dair)* g/mol source mg/L source mg Hg source unitless source cm"21s source Benzene (USEPA)** 7 80E+01 ASTM 1 75E+03 ASTM 9 52E+01 SPHEM 2 2E-01 ASTM 9 3E-02 ASTM Benzene (California)"* 7 80E+01 ASTM 1 75E+03 ASTM 9 52E+01 SPHEM 2 2E-01 ASTM 9 3E-02 ASTM Toluene 9 20E+01 ASTM 5 35E+02 ASTM 2 84E+01 SPHEM 2 6E-01 ASTM 8 5E-02 ASTM Ethylbenzene 1 06E+02 ASTM 1 52E+02 ASTM 7 00E+00 SPHEM 3 2E-01 ASTM 7 6E-02 ASTM Xylenes, Mixed 1 06E+02 ASTM 1 98E+02 ASTM 7 96E+00 SPHEM 2 9E-01 ASTM 7 2E-02 ASTM Anthracene 1 78E+02 SPHEM 4 50E-02 SPHEM 1 95E-04 SPHEM 4 2E-02 SPHEM 6 OE-02 calculated Phenanthracene 1 78E+02 SPHEM 1 00E+00 SPHEM 6 BOE-04 SPHEM 6 5E-03 SPHEM 6 OE 02 calculated Pyrene 2 02E+02 SPHEM 1 32E-01 SPHEM 2 50E-06 SPHEM 2 1 E-04 SPHEM 5 75E-02 calculated 1,2,4-Tnmethylbenzene 1 20E+02 Mont-2 5 70E+01 Mont-2 1 00E+00 Mont-2 2 3E-01 Mont-2 6 BE-02 calculated * Some or all of the values for this parameter have been calculated as follows Henry's Law Constant If H was provided in units of moleslL-atm, it was converted to the unitless H by multiplying by 41 Diffusivity in air (Dail is estimated by the Fuller, Schettler, and Giddings method provided to Lyman, at al (1982) E Diffusivity in Water Calculated by the Hayduk & Laudie method in Lyman, at al (1982), assumes a temperature of 16 C Soil-Water Sorption Coefficient is calculated as the fraction of organic carbon (foc) times the Kow FOC is from Table 2 ** Site-Specific Target Levels (SSTLsI have been calculated using both USEPA and California OEHHA cancer slope factors Sources ASTM - ASTM 1995 (Risk-Based Corrective Action Standard) SPHEM - USEPA 1986 (Superfund Public Health Evaluation Manual) Mont-2 Montgomery 1988 (Groundwater Chemical Handbook - Volume 2 x ImarkslSAFEWAY2 XLW Page 1 of 2 2126196