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Stockton 99 Speedway Preliminary Endangerment Assessment Workplan April 12,2007 extent of petroleum hydrocarbons, organochlorine pesticides, and metal-impacted soil has not been adequately defined. Additional sampling is required. Racetrack Area: Kleinfelder collected 14 discrete soil samples from six hand-augered borings from within f the interior of the racetrack. No petroleum hydrocarbons in the gasoline (TPHg), diesel (TPHd), or motor oil (TPHmo) range were detected in any of the samples. However, chromium, lead, nickel, zinc, cadmium were detected. All samples were collected using hand augering techniques to a maximum I depth of five-feet bgs. No data for soil located deeper than five-feet bgs has been collected; therefore, the laterial and vertical extent of metal, organochlorine pesticides, or TPH-impacted soil is unknown. Grandstand Fill Area: The soil underlying the grandstands is reportedly comprised primarily of soil that originated from the area located northwest of the racetrack. This area has.been reportedly used for agricultural purposes. No characterization of this soil has been performed; therefore, the presence and extent of metals and pesticides is unknown. Retention Basin: Two borings were advanced within the Retention Basin Area to a depth of 26 to 33 feet bgs during the investigation conducted by Kleinfelder. No characterization of soil in the shallower (<26 feet bgs) zone has been perfon-ned. The Retention Basin Area serves as the collection point for all of the Site's surface water runoff. Therefore, the potential exists for soil underlying the Retention Basin Area to be impacted with metals, organochlorine pesticides, TPH, and VOCs from the influx of surface water -� originating from the Site. Parking Lot A Area: No characterization of soil underlying this area has been performed. Historical land use for this area includes agriculture; therefore, the presence and extent of metals and organochlorine pesticides in this area will be evaluated. This area will also serve as the source for background metal data for the Site. Parking Lot B Area: This area is believed to contain 2-3 feet of fill material collected from the area adjacent to the Site. Historical land-use for adjacent properties included agricultural 'production; therefore, the presence and extent of metals.and organochlorine pesticides in this area will be evaluated. 3.2 Human Health and Ecological Screening Evaluation As previously described in Section 2.1 the goal of the Stockton 99 Speedway PEA is to evaluate the risks to human health-and the environment posed by chemicals detected at the Site. To evaluate the risks, a human health and ecological screening evaluation will be prepared during the PEA process. The purpose of the screening evaluation is to utilize regulatory guidance to quantify potential exposures in order to identify the need for, and the possible extent of, remediation activities to adequately protect human and ecological health. The methods used to conduct human health and ecological screening assessments are consistent with methods developed by the U.S. Environmental Protection Agency PEA VkdgAan Final.doc 3-6 The Source Group,Inc.