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On March 18, PetroTek, the tank closure contractor, peformed a pressure test on the <br /> piping. All underground portions of the supply piping, the return piping, and the <br /> vent piping were pressurized with forty to fifty pounds per square inch of air <br /> pressure for thirty minutes. The test showed that the supply piping is leak tight. <br /> The test also showed that the return piping and the vent piping do not hold air <br /> pressure and therefore are suspected of having leaked diesel fuel during the <br /> operation of the underground system. A plan of action for this piping will be <br /> developed after further discussion with Mr. Snavely. <br /> The collection and preparation of samples at the March 11, 1994, closure of 836-DlU1 <br /> was witnessed by Bill Snavely of your office. The results of analyses of these <br /> samples, and the results of the March 18, 1994, pressure test on the underground <br /> piping, were reported to Mr. Snavely on March 21, 1994. <br /> If you have any questions regarding this matter, please contact Richard Henry at <br /> (510)423-3641. <br /> Sincerely, <br /> C. Susi Jackson, Divisi Bader <br /> Operations and Regulatory Affairs <br /> Environmental Protection Department <br /> Attachment <br /> cc: Galles, H., L-626 <br /> Grandfield,C., L-633 <br /> Grissom, M., L-871 <br /> Henry,R., L-633 <br /> Hill,P.,DOE/OAK/ESFOD L-575 <br /> Timm, S., CVRWWB <br /> Warner, W., DOE/OAK/ESFOD L-575 <br />