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AST INSPECTION CHECKLIST(S) Inspector: Gavin Kopp Cert No: 103671 Company: Canary Renewables Corp. Tank: T-631 3134A Report No: Canary 3134A Date: 2/21/2023 TABLE C.1 TANK IN-SERVICE INSPECTION CHECKLIST C.1.1 FOUNDATION a. _X_ Measure foundation levelness and bottom elevations. C.1.1.1 Concrete Ring a. _X_ Inspect for broken concrete, spalling and cracks, particularly under backup bars used in welding butt welded annular rings under the shell. B. ___ Inspect drain openings in ring, back of waterdraw basins and top surface of ring for indications of bottom leakage. c. _X_ Inspect for cavities under foundation and vegetation against bottom of tank. d. _X_ Check that runoff rainwater from the shell drains away from the tank. e. _X_ Check for settlement around perimeter of tank. C.1.1.2 Asphalt a. _X_ Check for settling of tank into asphalt base which would direct runoff rain water under the tank instead of away from it. b. ___ Look for areas where leaching of oil has left rock filler exposed, which indicates hydrocarbon leakage. C.1.1.3 Oiled Dirt or Sand a. ___ Check for settlement into the base which would direct runoff rain water under the tank rather than away from it. C.1.1.4 Rock a. ___ Presence of crushed rock under the steel bottom usually results in severe underside corrosion. Make a note to do additional bottom plate examination (ultrasonic, hammer testing, or turning of coupons) when the tank is out of service. C.1.1.5 Site Drainage a. ___ Check site for drainage away from the tank and associated piping and manifolds. b. ___ Check operating condition of dike drains. C.1.1.6 Housekeeping a. _X_ Inspect the area for buildup of trash, vegetation, and other inflammables buildup. C.1.2 SHELLS C.1.2.1 External Visual Inspection a. _X_ Visually inspect for paint failures, pitting, and corrosion. b. ___ Clean off the bottom angle area and inspect for corrosion and thinning on plate and weld.