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8 <br />April 20, 1990 <br />Arco <br />P.O. Box 5811 <br />San Mateo, California 94402 <br />Attention: Courtland Holman <br />MECHANICAL CONTRACTORS <br />1919 Market Street <br />P.O. Box 12954 <br />Oakland, California 94604 <br />(415) 8342333 <br />Contractors License No. 184480 <br />Reference: Station #4932, 16 East Harding Way, Stockton, CA 95205 <br />Work Order *110375 <br />Dear Mr. Holman, <br />On April 17, 1990, we precision tested three (3) underground storage tanks using <br />the "Petro-Tite" system. <br />The results for the tank tests were as follows: <br />PRODUCT <br />Unleaded <br />Regular <br />Supreme <br />CAPACITY <br />12,000 <br />12,000 <br />12,000 <br />RESULTS <br />-.022 gph <br />-.031 gph <br />-.033 gph <br />All the above leak rates are within the NFPA criteria of +.050 gallons per hour; <br />therefore, these tanks and attached piping can be considered liquid tight at this <br />time. <br />The test results are attached. <br />If you have any additional questions or if we can be of further assistance to you, <br />please call us at (415) 834-2333, extension 3455. <br />Very truly yours, <br />SCOTT CO. OF CALIFORNIA <br />Michael SAweickert-Start' <br />Environmental Assistant <br />MSS: jnj <br />Enclosures as stated <br />