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Table 8: Soil Screening Levels for Each Receptor <br />Chemical Residential Commercial/ Industrial Utility Worker <br />0 to 5 feet bgs <br />mg/kg <br />Volatilization to <br />outdoor air <br />(5 to 10 feet bgs) <br />mg/kg <br />0 to 5 feet bgs <br />mg/kg <br />Volatilization to <br />outdoor air <br />(5 to 10 feet bgs) <br />mg/kg <br />0 to 10 feet bgs <br />mg/kg <br />Benzene 1.9 2.8 8.2 12 14 <br />Ethylbenzene 21 32 89 134 314 <br />Naphthalene 9.7 9.7 45 45 219 <br />PAH* 0.063** NA 0.68 NA 4.5 <br />* Based on the seven carcinogenic PAHs as benzo(a)pyrene toxicity equivalent [BaPe]. The PAH screening <br />level is only applicable where soil is affected by either waste oil and/or Bunker C fuel. <br />** DTSC (2009) reports average ambient PAH concentrations (as BaPe) in California ranging from 0.16 to 0.21 <br />mg/kg, and upper tolerance limits (UTLs) ranging from 0.9 to 1.5 mg/kg. The screening level shown <br />in this table is "risk-based" and therefore in this case is far below the average ambient <br />concentrations for PAHs in California. It is suggested that DTSC (2009) be consulted for sites with <br />PAH contamination. <br />NA = Not Applicable <br />21