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Mr. Jerry Lile <br /> July 17, 2000 <br /> Page 5 <br /> Area 15 <br /> 9) Elevated concentrations of total petroleum hydrocarbons (TPH) as gasoline were <br /> detected in soil samples from borings 156-6, -8, and -9. These borings were advanced <br /> at an area where geophysical anomalies were observed. These anomalies suggested <br /> the possibility of an underground storage tank (UST). The detection of elevated levels <br /> of gasoline further suggest that a tank might be located at the observed geophysical <br /> anomalies. Gasoline concentrations in soil increase with depth at boring 156-9. The <br /> deepest soil sample collected from boring 156-9 contained TPH as gasoline at a <br /> concentration of 8,500 mg/kg. The results for this 15 foot sample from boring 156-9 <br /> indicates the possibility that residual contaminants may be present at deeper depths <br /> and groundwater is possibly contaminated. It may also be possible that free product is <br /> floating on the water table at 156-9 <br /> Recommendation <br /> The GSU recommends that a backhoe be used to look for an UST at the <br /> Geophysical anomalies. During excavation removal of contaminated soil should <br /> be done to minimize further groundwater degradation. Assessment of <br /> groundwater quality should be considered for the 156-9 location. The GSU also <br /> recommends that the boring logs for borings 15B-6 through -9 and recent <br /> investigation borings conducted for Area 16 be included in the RI. <br /> If you have any questions or require additional information regarding this matter, please <br /> telephone me at (916) 255-3709. <br /> C:\OFFICE\WPWIN\WPDOCS\WPSUITEW ORSHRI.WPD <br />