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11 May 1992 <br /> (GeoAudit CV43F3-1. 16) <br /> Page 3 of 5 <br /> location of the nine soil samples. Table 1 lists the laboratory <br /> results from the second phase of excavation. TPH as gasoline and <br /> BTE&X were not detected (ND) in the samples. TPH as diesel was <br /> detected only in samples CARD-3, CARD-4 and CARD-5. <br /> On 6 November 1991, approximately 550 cubic yards of contaminated <br /> soil were removed from the area near the center of the excavated <br /> trench. Four soil samples (C-1,2, 3,4) were collected from the floor <br /> of the excavation at a maximum depth of 22 feet. These samples were <br /> analyzed for TPH as diesel. The samples were collected applying the <br /> same protocol used in the second phase of excavation. Table 2 lists <br /> the laboratory results from the third phase of excavation. Figure <br /> 2 shows the location of the samples. TPH as diesel was not detected <br /> in- samples C-1, C-2 or C-3 . Sample C-4 showed 56 mg/kg for TPH as <br /> diesel. <br /> All excavated soil was placed on the asphalt adjacent to the <br /> excavation. <br /> REMEDIATION <br /> After all the contaminated soil was excavated, a portable Soil <br /> Remediation Unit (SRU) was transported on-site by Falcon Energy <br /> Associates to thermally oxidize the hydrocarbon contaminated soil. <br /> A process description of the SRU, provided by Falcon Energy, is <br /> included in Appendix C. <br /> According to Falcon Energy records, approximately 2, 400 cubic yards <br /> of contaminated soil were excavated from the site. After the soil <br /> was treated, a representative of GeoAudit collected a total of 40 <br /> soil samples. The samples were collected directly from the treated <br /> soil piles using a metric sampler loaded with two precleaned, 2 .5 <br /> by 3 inch brass tubes. The ends of the lead tubes were immediately <br /> covered with aluminum sheets, capped, sealed with tape and stored <br /> on ice. <br /> The samples were transmitted to WEST Laboratory and analyzed for <br /> TPH as diesel. Table 3 lists the analytical results of these <br /> samples. <br /> Falcon Energy records indicate a total. of 4,099 tons (approximately <br /> 2,900 cubic yards) of contaminated soil were treated using the SRU. <br /> This includes about 675 tons (485 cubic yards) of soil that were <br /> treated twice during an adjustment process for temperature and <br /> retention time. Table 4 lists the specific days and the amount of <br /> soil processed each day. <br /> Once the SRU had been adjusted to the correct temperature and <br />