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Stockton 99 Speedway Preliminary Endangerment Assessment Workplan April 12,2007 Step 1: State the Problem: • . In order to evaluate whether COPCs and other contaminants pose a potential risk to human health and/or the environment, data regarding concentrations and distributions of COPCs and other contaminants in the soil are needed. Step 2: Identify the Decision: Determine whether COPCs and other contaminants present at the Site pose an unacceptable risk to human health and/or the environment, and require development of remedial alternatives to mitigate the risks. Step 3: Identify Inputs to the Decision: • Soil samples will be collected and analyzed for COPCs, and other contaminants, from areas of the Site. Step 4: Define the Study Boundaries: • The boundaries of this study are limited to the Stockton 99 Speedway property and immediate vicinity where samples will be collected. Step 5: Develop a Decision Rule: • If the concentrations of COPCs or other contaminants at the Site pose an unacceptable risk to human health and/or the environment, then a Removal Action Workplan or Remedial Action Plan will be prepared to evaluate potential remedial alternatives to mitigate the risks. However, if it is determined that there is an acceptable risk to human health and environment, then no further action would be required. Step 6: Specify Tolerable Limits on Decision Errors: • Tolerable limits are evaluated for decision errors to identify acceptable consequences. The possibility of a decision error exists because a parameter of interest is estimated using data that are imperfect. A decision error occurs when the data are misleading, and as a result, the wrong decision is made. The data are subject to different variability at different stages of development, from field collection to sample analysis. The two main components of error are sampling design error and measurement error. Sampling design error occurs when the data collection design does not capture the complete variability within the media to the extent appropriate for the decision. Step 7. Optimize the Design for Obtaining Data: • The sampling and analyses plan has been developed to efficiently provide usable Site data. Components of the design include: PEAw60an.Final.dcc 5-2 The Source Group,Inc.