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STI Aboveground Storage Tank Report Formal External Inspection COVEY AUTO EXPRESS,Stockton,CA Storage Tank Report 1/21/2014 Tank No.4—Used Oil Weather: Clear moderate Inspection Goal Methods Employed Results 7,2 DETERMINE ORIGINAL SHELL THICKNESS 7.2.1 Review original documentation. Not Available 7.2.2 Consult tank manufacturer. 7.2.3 Examine tank labels for evidence of widely accepted tank standard,such as Underwriters Laboratories Standard UL142. 7,2.4 Measure shell thickness of several areas with no corrosion 0.072-0.077 IN,14 ga measured UTT 7.3 HORIZONTAL AST Requirements in addition to applicable items in 71: HOR(ZOWAL 7.3.1 Inspect shell plates, Inspect areas accessible without entering AST. Concentrate Sound OK Ultra Sonic welds where corrosion is likely.If significant internal corrosion is measurements,visible detected,further investigation using Ultrasonic Testing Scans underneath&on PCC floor (UTS)is required. 7,3,2 Inspect shell Inspect for changes made after AST was fabricated.Record 1-1/2"pipe legs w/casters attachments repads and/or insert plates.Inspect welds for signs of stress 4topside 2"NPT openings and corrosion. 7,4 VERTICAL-or Requirements in addition to applicable items in 7.1: N/A RECTANGULAR AST 7.4.1 Inspect shell plates, Inspect areas accessible without entering AST. Concentrate N/A welds where corrosion is likely.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. Record N/A attachments repads and/or insert plates.Inspect welds for signs of stress and corrosion. 7,4,3 Vertical AST Roof Inspect for low areas,standing water,paint failure,holes and N/A corrosion.Take Ultrasonic Thickness Testing(UTT)readings on roof and record results. If significant internal corrosion is detected,further Investigation using UTS is required. 7.4.4 DOUBLE WALL& Requirements in addition to applicable items In 7.1: NIA DOUBLE BOTTOM AST 7.4.5 Leak Detection Verify that the leak detection equipment method is operating N/A if the tank Is so equipped. 7,4,6 Inspect Interstice Check for leak or liquid in Interstice,not vented to N!A atmosphere. 7,4,7 Double bottom Double-bottom ASTs require LITT readings of areas that are N/A single-wall.Double-wall ASTs do not require UTT readings. 7,5 INSULATED AST Requirements in addition to applicable Items In 7.1 to 7.4. N/A 7,5,1 Remove insulation Remove insulation in areas where mold or moisture is present N/A or likely to accumulate and examine metal surface for corrosion. 7,5,2 Verify damage extent If insulation damage Is suspected,remove insulation until N/A extent and nature of corrosion has been established. 7.5.3 Take UTT readings Take UTT readings on shell and record results. If significant N/A corrosion is detected,further investigation using UTS is required. 7.5.6 FIELD ERECTED AST Additional requirements for field-erected ASTs are included In N/A SPo01 Appendix B. 7,7 FINAL REPORT Include:Field data,measurements,pictures,drawings,tables Dated 1/21/14 Re-inspect and an inspection summary,identify unacceptable conditions in 5 years or as specified in and recommended corrective actions.Determine the SPCCP or hazardous waste suitability for continued service.Include the next scheduled regulations formal external or internal inspection as applicable.Include inspectors name and certification number in the report