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TO: <br />FROM: <br />DATE: <br />SUBJECT: <br />191 .01/31 14:46 <br />0 <br />a 714 632 7133 XERXES <br />San Joaquin County Health Department - Ms. Tish Resch <br />Roland Fribourghouse <br />January 17, 1991 <br />Repair of Xerxes Tank at BP Station <br />Pursuant to your telephone request for details of Xerxes work <br />on the following Tank: <br />BP Oil Company <br />Station #11191 <br />Hammer at West Streets <br />Stockton, California <br />We submit as follows: <br />Complaint by Owner <br />1. Tank failed precision testing <br />2. No report of lost gasoline from inventory records <br />Xerxes Action <br />1. Sent field service crew - Tank passed air Test and was <br />declared tight. <br />2. A second precision Test still showed "leaker" - on second <br />try (on October 25/26, 1990) Xerxes found several tiny <br />pinholes and repaired them using factory materials and <br />personnel. <br />3. Subsequent precision Testing showed a tight Tank. <br />Summar <br />The pinholes repaired were located under several ribs which <br />explains: <br />1. Why there was no reported (to Xerxes) loss of product to <br />environment. <br />2. Why an air Test showed a tight Tank. <br />3. Why a precision Test would show °'leaker" since it cannot <br />differentiate between passage of liquid into a rib cavity <br />from liquid passing into the environment. <br />We trust the preceding satifies your request. <br />02 <br />