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A&A <br />T .7 <br />ANK ,I=G,. DIV. <br />September 3, 1987 <br />Mobil Oil Corporation. <br />Woodfield Engineering Center <br />1306 Canal Blvd. <br />Richmond., CA 9480z, <br />ATTN: Mr. T. R. Ross <br />RE: 10-992 Hammer Lane & 1-5 Stockton, CA <br />On August 20, 1981 %a. <br />Petro-Tite System -Test was performed'-,'at.the <br />above -referenced -166iiifoiin The test was performed .by,Mike <br />Womack..' -,-'A X; <br />clan Ort�if n- i6itlo4414eii4ea.­.`-'--:4,�� 'These <br />y.un P -ec 'Tests i accordance <br />d tankav-d-,�.- �SkMW' nr� <br />with the `-NEPA ode The NFPA66'de':3e9.02.cri:t <br />eria, or a <br />tight system is a maximum gain or loss '�bf .05 gallons per -hour. <br />Because of the almost infinite variables involved, this is <br />intended to be a mathematical tolerance and is not the permission <br />of actual leakage. <br />During the stand -pipe procedure, the internal liquid hydrostatic <br />pressure applied to the underground tank system is generally two <br />to three times greater than normal liquid storage pressures. <br />This.inci-ease in hydrostatic pressure will amplify the indicated <br />rate of leak accordingly. <br />SYSTEM TEST <br />TANK NO. I - North <br />SIZE - e,000 gallon glass tank <br />PRODUCT - Regular, <br />The test showed a leakage of -.010 gallons per hour. <br />Based on.' the above criteria, we find the system mathematically <br />Tight. <br />TANK NO. 2 - Centel- <br />SIZE <br />enterSIZE - 10,000 gallon glass tank <br />PRODUCT - Unleaded <br />The test showed a leakage of -.023 gallons per hour. <br />Based on the above criteria, we find the system mathematically <br />Tight. <br />