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<br />www.teaminc.com <br /> <br />STI SP001 Tank Inspection <br />Report <br />Community Fuels <br />Tank no. T-611 <br />March 30th 2019 Stockton, CA <br />Page 9 of 26 <br />4.0 SUMMARY / RECOMMENDATIONS <br /> <br /> <br />4.1 FOUNDATION / CONTAINMENT <br /> <br />Tank T-611 is an elevated shop-fabricated Vertical Aboveground Storage Tank (AST) of single-wall <br />construction. The tank is supported on four (4) steel structural supports with cross beams bolted on a <br />concrete slab. Visual (VT) inspection of the steel supports showed no signs of any recordable defects due to <br />settlement, service-induced deterioration or corrosion. It should be noted that the anchor bolts are in <br />acceptable condition. The supports are bolted / anchored to the concrete slab to secure the tank against <br />seismic uplift loads. <br /> <br />The tank is situated inside a concrete containment. The containment measures 103 inches (8.58 ft.) x 80 <br />inches (6.67 ft.) x 17 inches (1.42 ft.) and is capable of containing the volume of the tank capacity (25,000 <br />gallons) in the event of a tank failure. The containment also accommodates eleven (11) other tanks within the <br />facility and has four (4) sumps that drain water / product spill back to the oily water separator. <br /> <br />At the time of this inspection, the containment detail was found in acceptable condition with no breakages or <br />holes present in the concrete containment. Consideration should be given to lining the containment to prevent <br />future breakage or deterioration from weathering conditions. <br /> <br /> <br />4.2 SHELL <br /> <br />The standard of construction for this vertical AST is unknown at this time. The nameplate and construction <br />standard label are not present on the tank. <br /> <br />The external tank shell has fiberglass insulation present. Visual (VT) inspection found the external insulation in <br />acceptable condition at this time. <br /> <br />Visual (VT) inspection and Ultrasonic (UT) testing was performed from the TML (thickness monitoring location) <br />spots installed in thirty-two (32) areas around the tank shell and roof. <br /> <br />Ultrasonic (UT) testing of the tank shell and roof revealed a minimum remaining thickness of 0.248 inch and <br />an average thickness of 0.257. The assumed nominal thickness of the tank based on current thickness <br />measurements and fabrication drawing is 0.250 inch. <br /> <br />It should be noted that the tank is newly installed and will be put in service. <br />