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Recommendations Letter <br /> Formal External Inspection of AST-5 <br /> Valley Pacific Petroleum Services,Inc. <br /> Page 2 <br /> • Water-finding paste was used to determine if water was present in the tank. Water was not found <br /> in the tank. <br /> Shell Testing <br /> Ultrasonic Thickness(UT)measurements were recorded in order to establish an inspection baseline for use <br /> during future inspections with the purpose of identifying corrosion.Measurements and visual inspection of <br /> the tank shells revealed no internal or exterior corrosion. Refer to Figure 1, Attachment A, for thickness <br /> measurements and photographs attached to the formal report. <br /> Recommendations for Continued Use <br /> Based on current industry practices and regulatory requirements, Condor recommends the following: <br /> • Periodic inspection and maintenance of the normal vents by Facility personnel is recommended for <br /> proper vent operation. <br /> • Periodic checks for proper emergency vent operation are recommended. During Condor's <br /> inspection,the tank's long-bolt manway covers did not lift easily and may have been inadvertently <br /> sealed. <br /> • Installation of an overfill valve and/or a basic high liquid level vent whistle(alarm)is recommended <br /> in order to prevent overfill. <br /> • Perform and document monthly and annual inspections in accordance with the Facility SPCC Plan. <br /> These recommendations should be implemented as soon as feasible.If you have any comments or questions, <br /> please contact us at(209)234-0518. <br /> Sincerely, <br /> aCONDOR EART <br /> ord J nson,AS spector No. AST-T10388 <br /> Ironm tal Spe alist <br /> X:\Project\7000_pi]P167 Valley Pacific Petroleum NONA Support\7167C Stockton\7167C2 Tank Impections\Reports\AST-SFR 20181001 FEIR AST-5.docx <br /> �!i CONDOR <br />