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Conclusions <br /> With the exception of trace concentrations of certain constituents in boring B-1, <br /> none of the soil samples contained: petroleum hydrocarbons Trace concentrations of <br /> toluene, xylenes, and MTBE were detected in the sample collected from below the fill <br /> end of the center UST <br /> Based on the results of this investigation, it does not appear that any of the USTs <br /> are leaking The low concentrations of gasoline constituents from boring B-1 is probably <br /> the result of historical overfill during fuel deliveries to the site Much higher <br /> concentrations would be expected from even a small UST leak in highly porous and <br /> permeable sand that-is present beneath the USTs <br /> The results of this investigation suggest that the USTs are in relatively good <br /> condition that are suitable for lining installation as an upgrade Tank lining operations <br /> require that the USTs be exposed and inspected, which would indicate the actual <br /> condition of the USTs prior to lining It appears that relatively low concentrations of <br /> petroleum hydrocarbons in one of the samples is the result of historic overfill during <br /> deliveries, and does not warrant further investigation <br /> If you have any questions or need additional information, please contact me at the <br /> • letterhead address or at(209) 645-4632 <br /> With best regards, <br /> Herman Schymicze <br /> Registered Geologist#4165 <br /> pc Mr Ed Cardoza, Jr, Cardoza Enterprises ED 0��lp <br /> HERMAN 8 <br /> * swymIcZEK �c <br /> 4165 <br /> l9TF OF CA���� <br /> 'i <br />