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Table 7: Chemical Parameter Values <br />Chemical Parameters Units Benzene <br />Ethyl- <br />benzene <br />Naphtha- <br />lene <br />PAH 1 Reference <br />Henry's Law constant 0.23 0.32 0.02 2.0E-5 SF RWQCB ESLs <br />Organic carbon partition <br />coefficient <br />ml/g 58.9 360 1200 5.5E+6 SF RWQCB ESLs <br />Diffusion coefficient in air cm 2 /s 0.088 0.075 0.059 ND SF RWQCB ESLs <br />Diffusion coefficient in <br />water <br />cm 2 /s 9.8E-6 7.8E-6 7.5E-6 ND SF RWQCB ESLs <br />Toxicity Parameters <br />Oral slope factor (SF o ) 1/(mg/kg-d) 0.1 0.011 ND 1.7 <br />OEHHA (2009, 2010 — <br />BaP PHG) <br />Inhalation unit risk (IUR) 1/(µg/m3 ) 2.9E-5 2.5E-6 3.4E-5 1.1E-3 OEHHA (2009) <br />Oral reference dose (RfD0 ) mg/kg-d 0.004 0.1 0.020 ND USEPA IRIS <br />Reference concentration <br />(RfC) <br />mg/m 3 0.060 2 0.009 ND OEHHA RELs <br />Dermal absorption factor <br />from soil <br />ND ND 0.13 0.13 SF RWQCB ESLs <br />Gastrointestinal absorption <br />factor <br />- 1 1 1 1 SF RWQCB ESLs <br />ND = No Data <br />SF RWQCB ESLs. Regional Water Quality Control Board (RWQCB) Region 2— San Francisco. 2008. Screening for <br />Environmental Concerns at Sites with Contaminated Soil and Groundwater. Interim Final. May <br />OEHHA (2009). OEHHA Cancer Potency Values as of July 21, 2009. <br />OEHHA RELs. OEHHA Chronic Reference Exposure Levels (RELs). http://www.oehha.ca.gov/risk/chemicaldb/ <br />USEPA IRIS. USEPA Integrated Risk Information System on-line database. <br />The chemical properties for benzo(a)pyrene were used as a surrogate for the "PAH" group. <br />20