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,All <br /> ,.. <br /> Mr. Scott Stoner <br /> 202/799--5030 <br /> May 25 , 1988 <br /> f Page 2 <br /> Control Board (CRWQCB) . In addition,` GTI proceeded with the <br /> assessment phase of 'the ..investigation' as described in the <br /> enclosed report. i <br /> Low concentrations of soil contamination found within the soil <br /> borings surrounding the excavated tank pit suggests that the <br /> majority of hydrocarbon contaminationwithin the soils was <br /> excavated at the time the underground tank was removed. The lack <br /> of any detectable groundwater contamination in the monitoring <br /> wells supports this . It is. GTI ' s recommendation that concurrent <br /> with the ongoing site demolition, the" following work steps be <br /> performed: <br /> Using laboratory results , determine areas still <br /> requiring excavation. <br /> Drill several hand auger borings within the walls of <br /> the pit to further aid in defining the extent of <br /> contamination. <br /> " Proceed with excavation using information obtained from <br /> the two previous work steps` in addition to visual, <br /> evidence. <br /> " Install one drive point well in the base of the pit to <br /> determine if groundwater directly below has been . <br /> impacted. <br /> The completion of the above mentioned'' work steps would allow GTI <br /> to verify that no groundwater contamination has occurred . In <br /> addition, by removing any remaining hydrocarbon contaminated I <br /> soils , the source of potential future groundwater contamination <br /> } <br /> t <br /> i <br /> i <br />