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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 -I 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. <br />require that the USTs be eIons <br />xposed and inspected, whi hwould alindicate the actual <br />lining operati <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) 6454632. <br />With best regards, <br />Herman Schymicze <br />Registered Geologist #4165 <br />PC: Mr. Ed Cardoza, Jr.; Cardoza Enterprises <br />HERMAN S. <br />4165 <br />L�L'L�, 1 -1.1 <br />