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November 11, 1988 <br />Jody Roman <br />201 Spear Street <br />6th Floor <br />San Francisco, CA 94105 <br />Subject: Tank Leakage <br />Austin W.O. 88-4837 <br />Dear Jody: <br />2001 RAND ROAD <br />DES PLAINES. ILLINOIS 60016 <br />PHONE: 312/694-4300; 827.8833 <br />TELEX: 910 - 233 - 0893 <br />ENVIRONMENTAL HEALTH <br />PERMIT I SERVICES <br />It is our understanding that your site contains a double wall <br />Xerxes 550 gallon under -ground Diesel tank, equipped with <br />Universal Sensors and Devices Model LALS-1 Leak detector located <br />at the bottom of the interstitial space of the containment volume <br />of the tank. It is also our understanding that the leak detector <br />senses 0.25 inches of liquid. This tank was designed and <br />installed for MCI in 1985 by other than the Austin Company. <br />The following calculation, prepared at my direction, indicates <br />the maximum leak into the interstitial space prior to detection <br />is 0.406 gallons. <br />If I can be of further service, please call. <br />Sincerely, <br />C7 <br />Joe W. Hale <br />Chief Mechanical Engineer <br />512M <br />CC.* Ray White, MCI Telecommunications Corporation <br />Enclosure <br />