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1 . Stockton 99 Speedway Preliminary Endangerment Assessment Workplan Apri! 12,2007 •Racetrack Area - This area reported concentrations of LUFT metals including cadmium, chromium, lead, nickel, and zinc. In addition, an AST was located north of the track and fueling activities were conducted in the racetrack area creating the potential for soil to be impacted with petroleum hydrocarbons and VOCs. •Grandstand Fill Area - This area contains fill material removed from the area located northwest of the racetrack. •Retention Basin Area - This area serves as the collection point for surface water runoff originating from the Site. Potential-impacts to soil underlying the Site include automotive fuels and metals from contaminated surface water runoff. e Parking Lot A-This area served as an "overflow" parking area for the racetrack. Historic use of this area has included agricultural activities. E E e Parking Lot B Area - This area has been reportedly graded with 2 to 3-feet of fill material. Fill material in this area was taken from surrounding land and has not been characterized. Historic ` use of this area has included agricultural activities. E E ' 3.1.2 Chemical Release Mechanisms and Identification of Transport Media Release of chemicals can potentially occur through volatilization, wind and/or mechanical erosion (i.e., during construction), migration of chemicals from soil into the groundwater, or stormwater runoff. These types of releases may result in chemical vapor or dust (with sorbed chemicals) emissions in air or I stormwater runoff into surface water and sediment. These potential release mechanisms are discussed in more detail below. 3.1.2.1 Volatilization of Chemical Vapors No VOCs have been detected in samples collected on Site to date. However, soil samples collected for the PEA will be screened in the field for VOCs. VOCs typically have a low organic-carbon partition coefficient (Koo), a low molecular weight, and a high Henry's Law constant, indicating that these chemicals may volatilize. 3.1.2.2 Emission of Fugitive Dust Some of the suspected Site-related contaminants (i.e., metals, petroleum hydrocarbons, and organochlorine pesticides in soil) adsorb readily to dust particles. Chemicals adsorbed to soil particles can be blown into the air. This is referred to as fugitive dust. PEAworWa,.FErug.cbc 3-'2 The Source Group,Inc.