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Soil and ground water data for the subject properties included analytical <br /> results for TPH However, both ASTM (1996) and USEPA (1989) <br />' recommend that evaluation of chemical mixtures should focus on specific <br /> chemical constituents (e g, benzene) that may be present, rather than on <br /> an evaluation of the chemical mixture <br />' For this reason, the HRA focused on an evaluation of the specific <br /> consttuents present (e g, benzene) However, with regard to the TPH <br />' detections, it is notable that weathering appears to have resulted in the <br /> loss of the more volatile (and typically more toxic) fractions Furthermore, <br />' as will be discussed in the following subsection, the opportunity for any <br /> exposure to constituents of potential concern is limited both by land use <br /> and by the limited occurrence of residual compounds <br /> 52 IDENTIFICATION OF REALISTIC EXPOSURE PATHWAYS <br /> The following subsections describe land use information for the former <br />' tank sites, discuss potential exposure pathways for soil and ground water, <br /> and summarize the realistic exposure pathways for the former tank sites <br /> 52.1 Land Use <br /> The former Heinz property is located in a commercial/industrial area of <br />' the city of Tracy The property has historically been used for industrial <br /> purposes and is zoned for industrial use ERM is not aware of any plans <br /> to change the zoning of the property in the foreseeable future <br />' 5.2.2 Soil <br /> Based on land use information for the property and the absence of <br /> residual soil constituents in surface sods, there is little or no opportunity <br />' <br /> for exposure to residual soil constituents under conditions associated with <br /> the commercial/industrial use of the site Specific points regarding <br /> potential exposure are noted below <br /> • Because residual soil constituents are confined to the subsurface, <br /> commercial/industrial workers at the site are unlikely to be exposed to <br />' soil constituents via direct contact (i e, incidental ingestion and dermal <br /> contact) <br />' + Similarly, because soil constituents are confined to depth, commercial/ <br /> industrial workers are unlikely to be exposed to residual soil <br /> constituents via the inhalation of fugitive dust <br /> ERM 19 HEINZ USA-3374 60.3/27/00 <br />