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Aqua Terra Techi)dogies <br /> E.. <br /> '. the clay layer. Consequently, if the migration were allowed <br /> to continue, it will likely read, the groundwater. <br /> Aqua Terra recommends that the source contamination. be <br /> remediated through excavation, at the highest concentration <br /> of total petroleum hydrocarbons observed or at a depth of <br /> approximately 14 feet. The bulb or highest levels of <br /> contamination appear to exist between approximately 13 and. 17 <br /> to 13 feet. The actual amount of soil to be excavated would <br /> be determined in the field. Clean backfill material placed <br /> in the area after the tank was excavated could be excavated <br /> and stockpiled near the site for subsequent re-use after the <br /> contaminated fraction is removed. The contaminated soil <br /> r would have to be transported off-site for treatment or <br /> i <br /> disposal . Removal of the major source of contamination will <br /> eliminate the current potential costs associated with <br /> mitigating groundwater contamination. <br /> I-� <br /> ly <br /> 9 <br /> i <br /> 4 <br /> jt�S <br /> 1 <br /> Lr <br /> 4 <br /> Ldi <br /> 17 <br /> d <br />