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STI Aboveground Storage Tank Visual Inspection Report Gill Express Inspector: Wesley Greenwood 1022 Frontage Road AST4 Ripon , California 95366 Date : November 26 2018 Used Oil Inspection Goal Methods Employed Results 7 . 2 DETERMINE ORIGINAL SHELL THICKNESS Unable to gain access to AST steel Plate surfaces . 721 1 Review original documentation . Not Available 7 . 2 . 2 Consult tank manufacturer. Consulted with AST manufacturer. 7 , 293 Examine tank labels for evidence of widely accepted UL 142 No. 31335 tag on AST, tank standard , such as Underwriters Laboratories Verified with the AST manufacture Standard UL142. AST UL 142 label is valid . 724 4 Measure shell thickness of several areas with no AST Shell Thickness Measurements corrosion Were Not Taken . 7 , 3 HORIZONTAL AST Requirements in addition to applicable items in 7 . 1 : 7 . 3 . 1 Inspect shell plates , Inspect areas accessible without entering AST. Not Applicable welds Concentrate where corrosion is likely . If significant internal corrosion is detected , further investigation using Ultrasonic Testing Scans UTS is required , 7 , 3 . 2 Inspect shell Inspect for changes made after AST was fabricated . Not Applicable attachments Record rapad^ eind/or insert plates . Inspect welds for si ns of stress and corrosion . 7 .4 VERTICAL or Requirements in addition to applicable items in 7 . 1 : Vertical, Fiberglass AST with a RECTANGULAR Fiberglass Top AST 7 . 4 . 1 Inspect shell plates , Inspect areas accessible without entering AST. Fiberglass Shell and Top were welds Concentrate where corrosion is likely. Thickness of Observed to be Free of Defects . each plate . If significant internal corrosion is detected , further investigation using UTS is required . 7 , 4 , 2 Inspect shell Inspect for changes made after AST was fabricated . No Modifications to the AST Were attachments Record repads and/or insert plates . Inspect welds Observed . All AST Appurtenances for signs of stress and corrosion . Were Observed to be Free of Leaks. 7 .4 . 3 Vertical AST Roof Inspect for low areas , standing water, paint failure, Not Applicable holes and corrosion. Take Ultrasonic Thickness Testing ( UTT) readings on roof and record results . If significant internal corrosion is detected , further investigation using UTS is required . P714 , 5 DOUBLE WALL & Requirements in addition to applicable items in 7 . 1 : Not Applicable DOUBLE BOTTOM AST Leak Detection Verify that the leak detection equipment method is Not Applicable o eratin if the tank is so a ui ed . . Inspect Interstice Check for leak or liquid in interstice, not vented to Not Applicable atmosphere . 7 , 4 , 7 Double bottom Double-bottom ASTs require UTT readings of areas Not Applicable that are single-wall . Double-wall ASTs do not require UTT readings ._ 7 . 5 INSULATED AST Requirements in addition to applicable items in 7 . 1 Not Applicable to 7.4 . 7 . 5 . 1 Remove insulation Remove insulation in areas where mold or moisture Not Applicable is present or likely to accumulate and examine metal surface for corrosion . 7 . 5 . 2 Verify damage If insulation damage is suspected , remove insulation Not Applicable extent until extent and nature of corrosion has been established . 7 . 5 . 3 Take LITT readings Take UTT readings on shell and record results. If Not Applicable significant corrosion is detected , further investigation using UTS is required . 7 . 5 . 6 FIELD ERECTED Additional requirements for field-erected ASTs are Not Applicable AST included in SP001 ATTACHMENT B . 7 . 7 FINAL REPORT include : Field data , measurements , pictures , Revised Final Report Dated drawings, tables and an inspection summary, December 15, 2018 Prepared , identify unacceptable conditions and recommended Visual Inspection Findings are corrective actions. Determine the suitability for Contained in the Final Report, continued service. Include the next scheduled formal external or internal inspection as applicable . Include inspector's name and certification number in report. i