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ry Human Health Risk Assessment <br /> E Former Mobil Oil Bock Plant 04-343 <br /> 500 East Grant Line Road <br /> Tracy, California <br /> 3.0 <br /> HAZARD ARD IDENTIFICATI <br /> IE <br /> ON <br /> ' Hazard Identification is a discussion of the toxicological properties of particular chemical or <br /> class of chemicals. It is a qualitative evaluation that examines the applicable biological and <br /> chemical information to determine whether exposure to a chemical may pose a hazard or <br /> increase the incidence of a health condition or effect (e.g., cancer, bii-rh defects, etc.) (NRC, <br /> ' 1983; EPA, 1986). Human health effects studies are preferred over animal studies because of <br /> interspecies variation in response to chemical exposure. However, adequate human studies may <br /> not be available. When this occurs, the results of animal studies may give insight into the <br /> potential for human health effects from exposure to the same chemical <br /> ' Petroleum hydrocarbons within gasoline and diesel fuel ranges have bc, � detected in the soil and <br /> ground water at the former Mobil Oil Bulk Plant 04-343.1 The intent of ..his hazard identification <br /> ' is to assess, qualitatively, the animal and human biological effect, which may result from <br /> exposure to gasoline and diesel range hydrocarbons. The proceed;ng sections contain an <br /> overview of the composition, environmental fate, toxicity, and at_orption and distribution <br /> (toxicokinetics) of gasoline and diesel fuel. <br /> ' 3.1 GASOLINE AND DIESEL RANGE FUELS <br /> 3.1.1 Introduction <br /> ' Gasoline and diesel fuels are complex mixtures of hydrocarbons c:imprised principally of <br /> alkanes, cycloalkanes, alkenes, and aromatics. The characteristics of the distillate are dependent <br /> upon the origin of the crude oil, processing techniques, and the blendii,t- schemes (JAT, 1989). <br /> ' Diesel fuel is a distillate obtained from the middle boiling point fracti--In of crude oil. Diesel <br /> fuel consists primarily of hydrocarbons in the C9 to C20 range. Vari ,tis grades of diesel fuel <br /> ' are available and their composition changes depending on use. The chemical and physical <br /> properties of diesel fuel is presented in Table 3-1. MacKay et al., i,985) characterized five <br />' component classes of diesel fuel based on structural formulas, al-0 estimated the relative <br /> composition of unweathered diesel fuel. The results of the charactt:rization are presented in <br /> Table 3-2. <br /> k <br /> 30-0136-11 <br /> 1 3-1 <br />