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In-Service AST Inspection Report Formal External Inspection of 10,000 Gallon Tank(AST-7) Valley Pacific Petroleum Services,Inc. Page 4 3.1.1. UT measurements were not collected due to double wall design. However, visual inspection of the tank shell revealed no exterior corrosion. 3.2. The tank shells were inspected for indications of modifications that may have been made to the tank in the past.No evidence of modifications to the original tank was identified. 3.3. The vertical tank roof was inspected for low areas and standing water that may corrode the roof.No evidence of the above conditions was observed.Additional UT measurements and visual inspection of the tank roof revealed no internal or exterior corrosion. Refer to the thickness measurements and photographs attached to this Report. 3.3 INSPECTION SUMMARY The following sections provide a summary of the inspection completed for the tank. Ultrasonic Thickness Measurements Summary To obtain the residual metal thickness readings, a NDT Systems TG110 —DL ultrasonic digital thickness meter equipped with a TG-560P transducer was used.The meter has a resolution of±0.001 in(±0.025 mm) intended for use on steel plate and piping materials used in storage tank applications. The meter is capable of collecting readings using a scan mode or single point mode. The meter is factory calibrated(November 23,2016)and proper operation confirmed prior to and during testing using a steel calibration block adhered to the side of the meter. The transducer couplant used was NDT Systems UTGI 102 Ultragel II. Field data was recorded onsite.Refer to Figure 1,Attachment A,for a Tank Diagram and UT thickness measurements. Requirements for continued Tank service The STI Standard for Inspection requires the owner or operator of an aboveground tank to perform and document periodic inspections.Refer to the checklists contained in the Facility's Spill Prevention,Control, and Countermeasures (SPCC) Plan. These documents should be completed by the owner or operator on a monthly and annual basis as part of the SPCC Plan. The following recommendations are based on the requirements of SP-001 and UL 142. These documents are industry standards. 1. The nonnal operating vents must be fully operational to prevent damage from overpressure or vacuum during product transfer. Periodic inspection and maintenance of the normal vents by Facility personnel is recommended for proper vent operation. 2. The emergency vents must be fully operational and move freely to allow opening if overpressure occurs.Periodic checks for proper emergency vent operation are recommended. 3. Based on the STI Standard (SP-001), as a Category 1 tank, the interval until the next certified formal external inspection is 20 years.If the facility uses an alternate standard or chooses to provide "equivalent environmental protection"in lieu of routine integrity testing,the method and schedule for such should be included in the facility's SPCC Plan. a. If the Facility SPCC Plan requires the use of routine"integrity testing"using SP-001,then the following routine inspections should be completed by the Tank owner/operator. Specific inspection items may be modified for the tank's specific use as necessary;however,deviations from or alterations of the STI Standard should be discussed in the Facility SPCC Plan. 4. Effective September 2011, the STI Standard for Inspection requires the owner or operator of an aboveground tank to perform and document periodic inspections and maintenance. Refer to the checklists contained in Facility SPCC Plan. These documents should be completed by the owner or operator on a monthly and annual basis. g It k i(? CONDOR