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h <br /> INVESTIGATION <br />$ — Source of Contamination <br /> As a results of an initial investigation (Alt & Witzig File <br /> 140229 ) where soil sample collection indicated� that contamination i t <br /> I i <br /> existed near an underground storage tank installation, a <br /> k subsurface investigation to delineate the cause and potential <br /> source of the contamination was initiated. The source of the <br /> contamination was uncertain as daily logs maintained by the <br /> facility operators indicated. <br /> Y p no significant errors in inventory <br /> of a 4 <br /> n of the tanks . <br /> _ Y � <br /> Additional calculations with the maintenance records <br /> indicated the potential for a small (approximately o. 4 gal/day) <br /> leak in the unleaded gasoline tank (see appendix) . According to <br /> ` the graph a value of one (1) must be maintained over time to <br /> indicate no leak, fluctuations generally in less than .direction <br /> indicate loss of product, greater than one (1) indicate gain of <br /> G _ water. The magnitude of this leak is small enough to be readily <br /> missed in the dailymaintenance <br /> program. However the source of <br /> contamination therefore remains unidentified. It is currently <br /> therefore unknown exactly what is the source of the contamination <br /> at the facility. + <br /> Conversations with the facility g <br /> - y personnel regarding the <br /> potential source of contamination, since it was believed that the <br /> present tanks were not potential sources, indicated that many <br /> years another UST previously, for gasoline Storage_ g had been #� <br /> located in approximately the same region. No information remains r <br /> on it's location condition or removal. <br /> Page 34 � <br /> 71 <br />