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3.0 ASSESSMENT 4F RISK AND BENEFICIAL USES <br /> 16 / <br /> As required by Item #15 of the PHS EHD checklist, this section presents a <br /> rationale for why remaining site conditions will not adversely impact <br /> water quality, health, or other beneficial uses <br /> Based on the information provided in this report, the presence of TPH and <br /> related constituents does not pose a significant threat to human health or <br /> the environment, for the following reasons <br /> The release source causing soil contaxrunation has been removed The <br /> surface of the site is now entirely sealed with asphalt pavement and is <br /> used as a parking lot All residual soil contamination was identified at <br /> depth within the property boundary and beneath the asphalt cover <br /> ' . The lateral extent of soil contamination has been adequately defined <br /> within an approximately 15-foot radius of the former release location <br /> The vertical extent of soil contamination is adequately defined between <br /> approximately 10 and 35 feet bgs <br /> • As shown by historical monitoring data, the zone of ground water <br /> impact is limited to the immediate vicinity of the former UST and has <br /> not migrated over the 2-year monitoring period Additionally, site <br /> ground water is not a source of drinking water <br /> ® There 1s no opportunity for human exposure to the residual gasoline in <br /> the ground water, therefore, the residual gasoline does not present a <br /> risk to human health <br /> A small quantity of residual gasoline remains in the immediate vicinity <br /> of the former UST There is no indication of this gasoline migrating <br /> rthrough either soil or ground water, therefore, the residual gasoline <br /> does not present a risk to the environment <br /> S <br /> ' PRM 9 9343 50/UPRR/07/11/02 <br />