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ENVIRONMENTAL `, <br /> .-M. LABORATORIES O� <br /> =INC. C' + <br /> Y <br /> February 8, 1989 Re <br /> Arnie Gardner i <br /> Stockton Unified School District <br /> 1932 N. E1 Pinal Drive <br /> Stockton, CA 95205-2551 <br /> Re: Tank Testing <br /> Corporation Yard <br /> 1932 N. E1 Pinal <br /> Stockton, CA 95205-2551 <br /> Dear Mr. Gardner: <br /> On February 4, 1989, a Petro Tite System Test(s) was performed at the above- <br /> referenced location. The test was performed by Ray Norman, E.L.I. <br /> Technician. The NFPA Code 329.02 criteria for a tight system is a maximum <br /> loss of .05 gallons per hour. Because of the almost infinite variables involved, <br /> this is not the permission of actual leakage. <br /> During the stand-pipe test procedure, the internal liquid hydrostatic pressure <br /> applied to the underground tank system is generally two to three times greater <br /> than normal liquid storage pressures. This increase in hydrostatic pressure will <br /> amplify the indicated rate of leak accordingly. <br /> SYSTEM TESTS: <br /> Tank No. 1 - South <br /> Size - 12,000 gallons <br /> Product - Unleaded <br /> The test showed a minus .049 gallons per hour. <br /> Based on the above criteria, we find the tank tested mathematically tight. <br /> Tank No. 2 - North <br /> Size - 12,000 gallons <br /> �( Product - Regular <br /> The test showed a minus .033 gallons per hour. <br /> Based on the above criteria, we find the tank tested mathematically tight. <br /> Tank No. 3 - West <br /> Size - 10,000 gallons <br /> Product - Diesel <br /> The test showed a minus .043 gallons per hour. <br /> Based on the above criteria, we find the tank tested mathematically tight. <br /> 1477 E. Shaw, Suite 150/Fresno, California 93710/(209)225-6698 <br />