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Used Oil Storage Tank/ Containment Integrity <br /> Report <br /> for HMT Inspection <br /> Pape Machinery, Inc. May 5,2015 <br /> French Camp, CA Page 21 of 41 <br /> TABLE B <br /> SECONDARY CONTAINMENT SHELL PLATE CORROSION RATE <br /> CALCULATIONS <br /> Nominal/Original or Previous Shell Plate Thickness(inches) 0.134 inch <br /> Maximum External Corrosion Depth 0.000 inch <br /> Maximum Internal Corrosion Depth 0.005 inch <br /> Minimum Acceptable Course Thickness 0.050 inch <br /> Year of Inspection(Yi) 2015 year <br /> Year of Construction(Yo)if using nominal thickness or Year of previous UT 2006 year <br /> Average Remaining Thickness from External Thickness Readings 0.134 inch <br /> Average Remaining Thickness from Internal Thickness Readings 0.133 inch <br /> External Corrosion Rate 0.0000 inch/yr <br /> Internal Corrosion Rate 0.0001 inch/yr <br /> Remaining Life Calculation: <br /> Minimum Thickness—from UL 142, Sections 17,24 and 25=0.093 inch <br /> Least Remaining Tank Shell Thickness from Inspection=0.129 inch <br /> Calculation=Least Remaining Thickness— UL 142 Minimum Thickness=Calculated Corrosion Rate= <br /> 0.129 inch—0.093 inch=0.036 inch=0.0001 inch I year>20 years Remaining Life <br /> MA� 1 � 2015 <br /> NDTRPTNE.DOT REV 2 232-63333 Pape Machinery CA DTSC Used Oil Tank report rev2 5/15/2015 4:26 PM <br />