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2.4 Selection of Study Area <br /> This subsection presents the selection and description of the portions of the site (study area) <br /> evaluated in this risk assessment The purpose of selecting a study area is to focus the risk <br /> assessment on the major potential source of environmental impacts posed by site conditions <br /> The study area selected for evaluation in this risk assessment was based on the nature and <br /> extent of petroleum hydrocarbons in soil characterized in the site investigations As <br /> previously discussed in Subsection 2 3, petroleum hydrocarbons were detected at various <br /> concentrations throughout the former tank/vault area The extent of impacted soil appears <br /> to be limited to the uppermost 35-40 feet, with the highest concentrations of 7400 ppm <br /> detected in boring B-5 at 12 feet bgs <br /> The study area selected for evaluation in this risk assessment is the entire former tank/vault <br /> area The northern and southern boundaries of this area were delineated by sampling <br /> locations at which petroleum hydrocarbons were nondetectable. Delineation of the western <br /> and eastern boundaries was based on the maximum lateral distance that could reasonably <br /> be expected to contain petroleum hydrocarbons This area consists of approximately 127 <br /> square meters FIGURE 2-3 presents the study area evaluated in this report <br /> mANrAFE FNL%kw)03 26 93 2-13 cam&wN IM <br />