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11 only constituents not associated with the UST or at naturally- <br /> 2 occurring background concentrations, which do not warrant clean <br /> 3 up under established State guidelines. <br /> 4 8. Based on the foregoing, it is our opinion that this <br /> 5 UST case does not warrant further soil or groundwater evaluation <br /> 6 at the Site, particularly given the costly work requested by the <br /> 7� Health Department. Further, it is our experience that owners and <br /> 8 operators are not typically required by regulatory authorities to <br /> 9 conduct additional investigation under these circumstances. <br /> 10 9. In this regard, it is our understanding that the <br /> 11 Health Department has based its demand on further work on the <br /> 12 presence, at low levels, of benzene in the agricultural supply <br /> 13 wells. However, this detection did not result from the UST. <br /> 14 None of the soil samples collected during the excavation of soil <br /> 15 in the vicinity of the tank nor in any of the other soil samples <br /> 16 at the site contain benzene. Moreover, the level of benzene that <br /> 17 was detected (ten times lower than the action level) does not <br /> 18 warrant further investigation. <br /> 19 <br /> 20 Executed this IS'OON— _ day of 1993 in <br /> 21 Emeryville, California. <br /> 22 <br /> 23 <br /> Thomasohnson <br /> 24 <br /> 25 <br /> 26 <br /> 2711 <br /> 28 <br /> -6- VMaCOLORSPIVOHNSONMEC <br />