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1%W •0e _. R&B Trucking Preliminary Site Assessment Page: 6 4.3 Level One Property Assessment This assessment includes a visual inspection of the whole site for contamination evident at the surface. Discoloration,odors and unexpected lack or profusion of vegetation would indicate potential need for further investigation. In addition, the ground will be probed to a depth of one foot at surface locations at the sites to examine the soil for discoloration and odor. If discoloration or a suspect odor is found,soil samples will be collected and analyzed. 4.4 Health Risk Assessment The third aspect of this investigation is to perform a health risk assessment. The purpose would be to evaluate the risk to human health and safety if an individual —' came in contact with the petroleum product. Facets of the study would include single dose exposure at elevated levels of the chemical and chronic exposure of low levels of the chemical. The analytical data gathered during tank closure activities, the level one property investigation,and during ground water monitoring will be used in the risk assessment. 5.0 QUALITY ASSURANCE PROGRAM The following measures will be taken by Geological Technics to insure that a high quality study is conducted and that cross contamination does not occur. 5.1 Equipment — Soil borings will be drilled with a 7.25 inch(o.d.)hollow stem continuous flight auger, owned and operated by Osterberg and Stewart,Inc. Soil samples will be collected using a 2 inch(o.d.)modified California split spoon sampler liner with brass sample tubes. 5.2 Boring Logs Detailed logs will be made of each boring. The information noted will include: sample depths,blow counts,horizons of detectable contamination (detected by field methods), soil classification utilizing the Unified Soil Classification System and sediment description(color,texture,composition,hardness,moisture content,and post- depositional changes that have occurred in the sediments).