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-- systems, Inc. <br /> .,-'TTS <br /> Integrlly Tank Testing Y <br /> January 14 , 1988 <br /> Mr. Art Frank <br /> GENERAL MILLS, INC. <br /> 2000 West Turner Road <br /> Lodi, California 95240 <br /> Dear Art: <br /> Enclosed are the results of the series of tests we conducted <br /> on January 12 and 13 . <br /> Basically, we have arrived at the conclusion that the tank is <br /> leaking. <br /> The procedures we used to arrive at this conclusion are as <br /> follows : <br /> Upon arrival at your site at 8 :00 A.M. on January 12, we <br /> found that the product had decreased by approximately 34" from <br /> 12 :30 P.M. on January 11; this left the product at 5" above the <br /> top of the tank. We conducted the first test at this height . The <br /> results reflected a loss of 0 .044 gallons per hour. As this was <br /> within the loss parameters acceptable, we then raised the product <br /> height to 21" above grade, or 74" above the top of the tank. The <br /> results reflected a loss of 0 .427 gallons per hour. At this time, <br /> all the lines (supply, return, and vent) were only partially <br /> exposed, however, as the supply and return lines were pressure <br /> t:e.'sted and were shown to be tight. We decided that the probable <br /> culprit was either the vent line or a. possible plug at the south <br /> end of that tank. The last 4 ' of the tank ' s south end extended <br /> under a retaining wall , and was not exposed due to possible wall <br /> collapse. <br /> On January 13 , we exposed the full length of the vent line <br /> and the last 4 ' of the tank's south end. We also disconnected the <br /> .supply and return lines at the tank top. We then conducted a test <br /> on the tank at a level of 38" above grade, or 91" above the tank. <br /> top. This was done to assure an adequate pressure to stabilize <br /> any small vapor pockets and to compensate for any possible ground <br /> 800 <br /> 2b2 TEST 166 Frank West Circle _Stockton, CA 95206 (209) 466-8036 <br />