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' WZ1 INC exploratory soil borings and/or excavation sidewalls and floors will be included in both cross-section and map plan views to provide direct evidence of knowledge regarding the extent of the plume Soil sample data will provide vertical definition of the base of ' contamination should exploratory excavation soil samples not provide sufficient evidence of non-detection limits 1 If warranted, a series of risk-based models will be constructed using the Risk Based ' Corrective Action (RSCA) software and other PHSEHD-acceptable computer models These models will evaluate the public health risk and potential threat to local groundwater if any residual hydrocarbon contaminated soil is left in the subsurface after the excavation If the vertical and horizontal extent of soil contamination is determined to have no threat to ' local groundwater, a Problem Identification and Evaluation Report will be prepared and submitted to PHSEHD In the unlikely event that the soil site assessment phase of the tinvestigation indicates that local groundwater is likely to be impacted by the contamination, then a groundwater site assessment workplan will be submitted to PHSEHD for review In the unlikely event that the soil site assessment phase of the investigation indicates that ' local groundwater may be threatened, a groundwater site assessment may be warranted PHSEHD staff will make the determination if a groundwater investigation is warranted This 1 determination will be based on lithologic logs of exploratory excavation sidewalls and floors ' at the site, laboratory analytical data, results of any field testing performed during the exploratory excavation and sampling phase of the vadose zone investigation The ' requirement of a groundwater investigation will also depend on the estimated depth of groundwater beneath the site 1 ' 08220010 005 13