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USTs appear to have migrated offsite and are contributing to a portion of the <br /> observed, offsite petroleum impacted soil and groundwater <br /> • Based upon the presence of the 7-Eleven USTs and the detection of TPH and <br /> BTEX in soil groundwater samples from SV6, there appears to be a separate <br /> petroleum hydrocarbon plume east of the Cardlock site. The chroma- <br /> tographs indicate some differences between these two plumes The specific <br /> source of this plume has not been investigated However, there is <br /> documented evidence of gasoline spills at the adjacent 7-Eleven gasoline <br /> station <br /> o Lobv1940S49Veporl doc 10 940549 00 <br />