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Stockton 99 Speedway Preliminary Endangerment Assessment Workplan April 12,2007 Samples collected in from the Debris Fill, Racetrack and Retention Basin Areas will be selected for VOC and TPH analyses based on screening in the field. Field screening will include the use of a PID and visual and olfactory senses. Soil samples, which appear to be impacted, based on PID readings, visual and observations, and/or olfactory senses, will be analyzed for TPH and/or VOCs. Soil samples will be analyzed using the following methods: • CAM 17 Metals using EPA Methods 6010B17471; • Organochlorine pesticides using EPA Method 8081A; • TPH hydrocarbon chain identification using EPA Method 8015M with silica gel cleanup; and • VOCs using EPA Method 82606. Soil sampling locations were selected to address the data gaps identified in Section 3.1. Soil samples will be collected at depths of 0.5, 2, and 5-foot intervals to a maximum depth ranging from 10 to 25-feet bgs. Proposed sampling locations are shown on Figure 5. Sample point locations will be marked in the field before the sampling commences. The sample coordinates will be recorded using global positioning systems (GPS). 4.1.3.1 Composite Samples The guidance document title "Interim Guidance for Sampling Agricultural Fields for School Sites (2nd Revision)" published by the DTSC, August 2002, states that composite samples may be used in place of discrete samples for Sites that encompass an area greater than 20-acres and in which COPCs are distributed homogeneously throughout the Site. Historical land-use has included agricultural activities and it is reasonable to assume that organochlorine pesticides may have been deposited relatively evenly throughout the Site. Therefore, three-point composite samples will be collected for organochlorine pesticide and metal analyses for all borings located in the Retention Basin Area, Racetrack Area, Parking Lot A and B Areas, and Grandstand Fill Areas at samples depths of 0.5-feet, 2-feet, and 5-feet bgs so that one sample is collected from within the fill area, one sample is collected at the lithologic change, and one sample is collected from native soil. During the field investigation, samples depths may be revised to accommodate these sampling goals. Depth discrete soil samples will be collected from the Debris Fill Area due to the heterogeneity of the fill. 4.2 Sample Designations The samples will be labeled following the numbering system outlined in this section. Each sample will be assigned a unique alphanumeric sample identification code. The code will contain sufficient information to identify the overall site location and sample medium. The code will consist of three alphanumeric strings separated by hyphens. The first string will consist of the three letters "SSS" to designate the PEAM6#anlinal.doa 4-3 The Source Group,Inc.