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• <br /> and depth. The locations of each end of the tank were estimated, and samples were <br /> taken at depths of 165 inches (LP1-815-165, March 13, 1989) and 158 inches (LP2-815- <br /> ® 158, March 31, 1989). Samples were composed of native sandstone. Samples were <br /> analyzed for Total Fuel Hydrocarbons and Volatile Aromatics using EPA Methods 8015 <br /> and 8020, respectively. The results of the analyses (Attachment 8) showed that no <br /> ® contaminants were present at levels above limits of detection, except for diesel detected <br /> in Sample LP1-815-165 at an insignificant concentration of 22 ppm. These analytical <br /> results, in conjunction with the leak tightness test results, demonstrate that there were <br /> no significant unauthorized releases from Tank 815-11D. <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br /> 2 <br /> • <br />