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a <br /> ;.c,. THE CIRCLE K CORPORATION <br /> CONVENIENCE FOOD STORES <br /> az <br /> January 25, 1989 <br /> Mr. Charles Hunt <br /> San Joaquin Local Health District <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Review of Precision Tank Tests for 1986, 1987 and 1988. <br /> Dear Mr. Hunt: <br /> This letter is in reply to your request that I review the precision tank <br /> tests for our stores in San Joaquin County and determine if the test data <br /> indicates a product loss in excess of one (1) gallon. <br /> The NFPA code 329.02 criteria for a "tight" tank system is a tolerance of <br /> .050 gallons per hour. Because of the almost infinite variables involved <br /> the test results are not intended to be a mathematical tolerance and is not <br /> permission for any leakage of the tank system. <br /> In the event the precision tank testing indicates a tolerance and/or a leak <br /> rate in excess of .050 gallons per hour further investigation of the tank <br /> and lines must be performed to determine if the excessive tolerance or leak <br /> rate is due to temperature, tank end deflection, tank leak, an air pocket, <br /> line leak or incorrect testing procedures by test personnel, or a <br /> combination of the variable. <br /> For most tank and line tests we employ contractors that utilize Petro—tite <br /> test equipment. Enclosed herewith is a review of the tank test data on our <br /> San Joaquin County stores. <br /> Store #1205, 16470 Cambridge Street., Lathrop, CA. <br /> 1986, 1987, 1988 all tanks tested ' tight", no review required. <br /> Store #1334, 2650 Mt. Diablo Street, Stockton, CA. <br /> 1986 and 1987 all tanks tested "tight". <br /> 1988 the regular and unleaded tanks and lines tested "tight". The <br /> The premium unleaded tank failed (7/21/88). After investigation the <br /> failure was determined to have been caused by a loose pipe connection <br /> on the vent line. The problem was repaired and the tank was retested <br /> (8/25/88) and found to be "tight". See test data sheet enclosed. <br /> The temperature compensation use factor column 037) indicates the <br /> settled loss rate at —.250 gallons per hour on high level (—.250 x 2 <br /> hours. 5 gallons loss). <br /> The loss as calculated is assuming that the only tank variable is due <br /> to the loose vent pipe connection and not partially due to an air <br /> pocket, temperature, tank—end deflection, etc.. <br /> 3437 Myrtle Ave., Suite 440• North Highland,CA 95660 • (916)331-2540 <br /> i <br />