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Unlion t __.. �c Waste Oil Tank Assessment, 'FNKO - -, (2009) <br />Union Pacific <br />Tank TNKO - 0480 <br />UTG Thi kness <br />Tank <br />2nd Containment <br />reading <br />mm <br />mm <br />1 <br />5.5 <br />7 <br />2 <br />5.4 <br />7 <br />3 <br />5.4 <br />7 <br />4 <br />5.5 <br />7.1 <br />5 <br />5.6 <br />7 <br />6 <br />5.7 <br />7.1 <br />7 <br />5.7 <br />7 <br />8 <br />5.5 <br />7 <br />9 <br />5.4 <br />7 <br />10 <br />5.4 <br />7 <br />11 <br />5.3 <br />12 <br />5.6 <br />13 <br />5.4 <br />14 <br />5.5 <br />15 <br />5.5 <br />average, m12 <br />5.493333333 <br />7.02 <br />std deviation <br />0.116291915 <br />0.042163702 <br />3 sigma, max pit depth, mm <br />0.348875745 <br />0.126491106 <br />minimum shell thickness, UL 142, 2.36 mm <br />2.36 <br />2.36 <br />corrosion allowance, mm <br />2.333333333 <br />3.86 <br />minimum allowable shell thickness at pit, mm <br />1.18 <br />1.18 <br />corrosion allowance at pit, mm <br />3.964457588 <br />5.713508894 <br />Thickness aint, mm effective <br />0.8 <br />0.8 <br />estimated original plate thickness <br />5.8 <br />7.2 <br />number of years, <br />4 <br />4 <br />average corrosion rate, mm/yr <br />0.076666667 <br />0.045 <br />life expectapcy at plate, yrs <br />30.43478261 <br />85.77777778 <br />corrosion rte at pit., mm/yr <br />0.087218936 <br />0.031622777 <br />life expectancy <br />at pit, years <br />45.454092361 <br />180.6770154 <br />Integrity testing findis: Based on the above noted integrity test and the <br />results obtained rorn t test, the tank has sufficient integrity for its intended <br />use. Initial <br />Strandberg Associates 1(866) 388-0404 (650) 329-8918 rwaterquynrwaterquy.corn 16 <br />