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I P <br /> Page 9 TL 686-082-02 <br /> 6.0 EVALUATION OF RESULTS <br /> I i <br /> i <br /> The purpose of , this investigation was to determine the i <br /> extent of transformer oil in the soil in the area where the <br /> 10, 000 gallon tank and appurtenant equipment where located at the <br /> site. <br /> The initial soil samples obtained and tested during removal i <br /> operations at the site revealed detectable concentrations of oil <br /> and grease in the soils under the tank (220 mg/kg at a depth of <br /> 15 feet below grade) , sump (840 mg/kg at a depth of 4.5 feet <br /> I <br /> below grade) , and piping (200 mg/kg at a depth of 2 feet below p <br /> grade) . The results ofY the chemical tests on the soil samples <br /> taken at depths of� 5 and 10 feet below the initial samples <br /> revealed non-detectable concentrationsof Total Volatile Organic <br /> Hydrocarbons, and Oil and Grease. The <br /> locations of the samples <br /> taken and the analytical results of the tests is presented in the <br /> cross-section on Drawing No. 4 . it <br /> Basad on the physical appearanceofthe underground storage � <br /> tank, i.e. no holes or rust build-up, it appears that any leaks <br /> that occurred were limited to the piping connections . This is <br /> 'i <br /> substantiated by the fact that none iof the samples taken from <br /> beneath the tank, during this investigi tion, contained detectable <br /> I <br /> concentrations of oil and grease. Therefore, the oil and grease � <br /> I � <br /> detected in the soil is limited to the upper 2 to 3 feet. <br /> � l! <br /> Furthermore, due to the fine grained nature of the soils, and the t <br /> estimated 25 feet of separation between groundwater and the <br /> contaminated soils, it is our opinion, provided that the <br /> o7�o7u �a°a�aaa�miee,�nc. <br /> I <br /> Fresno Modesto Visalia Bakersfield j <br />