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.08.x1928 MIO VALLEY AG SEWICES STI SP-001 EXTERNLL INSPECTION POWERSIL,., ass FACIu BuamING_In» FA%107922}2B1 ENGINEERING&INSPECTION,WC. DonnaM Oil Tank Executive Summary Powers Engineering and Inspection, Inc. (PEI)was contracted by Mid Valley Agricultural Services to provide an STI SP001 Inspection for the Dormant Oil Tank at the Linden, Ca facility, on July 16, 2019. This tank inspection included the tank, tank appurtenances, tank foundation, and tank containment. In addition, PEI inspected all piping, piping connections and supports, and tank related electrical components from the first skin valve to the first flanged connection outside the containment. This report is generated on data gathered from three locations: applicable codes, regulations, and laws;the observed field conditions existent during the STI-SP001 inspection; and material provided in written form by the facility, end-user, or client (e.g., as-builts, previous inspection reports, written transcriptions of conversations with the facility). This inspection report is based solely on empirically observable conditions, observed during the inspection process and correspondence with the facility or end-user. The Dormant Oil Tank is a vertical 9.5-ft diameter x 24-ft high, butt and lap-welded, above ground, steel storage tank.The year of construction and the manufacturer are unknown but the tank is reported to be at least 20 years old.The tank has an approximate capacity of 12,844 gallons and is currently in Dormant Oil service. Inspection Methods Results Goal Employed 1. Hydraulic . VT of tank a. Visual assessment and non-destructive testing performed and bottom, did not identify any key components that may affect the Structural appurtenances, hydraulic integrity ofthe tank. Integrity shell, piping, b. Coated-over pitting is present throughout the external shell containment area surface. The average pits are 0.07-in and the deepest for signs of product measured pit was 0.13-in.The shell was measured at 0.425- leakage. in thick and there is sufficient corrosion allowance to allow the present pitting to remain. The pits should not deepen if the coating system is maintained. c. Threaded nozzles are used on the shell. Threaded appurtenances have a higher tendency to develop seeps. No seeps were present at the time of inspection. Monitor the threaded nozzles for signs of seeps. d. The tank is set on a 1.5-in thick dry styrofoam layer in a lined concrete secondary containment area. e. The inspection of the tank was performed while the tank was in-service. The tank is in acceptable condition. f. No significant items were noted that would affect the structural integrity of the tank. g. Ultrasound thickness readings(UT)were performed along the accessible tank surfaces. The shell is 0.425-in thick. No significant metal loss due to internal corrosion was noted. 2. Release . VT of Release a. The tank rests in a lined containment area, is on a 1.5-in Detection Prevention Barrier thick Styrofoam base and does not have a Continuous RPB Release Detection Method (CRDM). If the tank is leaking • Review of there will be visual evidence around the base of the tank. At Continuous the time of the inspection this area was full of debris. This Release Detection area should be cleaned off for proper leak detection. Method CRDM b. The tank has a Release Prevention Barrier (RBP) in the form of a lined concrete secondary containment area. Sr%AXnAa awvY A9SerA Ie m Page 2 o 18 oaePm anwi9iJSnJ oa NU=JUYMIS eA