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In-Service AST Inspection Report Formal External Inspection of Tank 2 CDCR—NCYCC Page 6 1. The operational vent must be installed on the Tank's primary compartment.The inspector observed an undersized operational vent installed on the Tank.Adequate operational venting is required for continued service of the Tank. Install at minimum, a single 4-inch diameter operational vent,with no reduction in pipe diameter, on a minimum 4-inch diameter Tank port. 2. The inspector noted that Tank shells and piping surfaces had areas of paint failure. The coating of Tank shells and piping should be maintained intact. Failed coating and surface rust and should be removed, followed by application of a protective coatinm for continued service of the Tank. 3. The liquid level gauge read approximately one foot, 9.5 inches and manual liquid level measurement was one foot,7.5 inches. Calibrate the liquid level gauge to a difference of one inch or less from the manual measurements. 4. The inspector noted exterior product staining near the top-mounted submersible dispenser pump. Evaluate the operability of the dispenser pump. Clean the exterior of the Tank to be able to identify new leaks. 5. Based on the STI SP001 Standard,the interval until the next certified formal external inspection is 20 years and should take place on or before September 9,2041. 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. The Facility SPCC Plan requires the use of SP001, monthly and annual inspections are to be completed by the Tank owner/operator. Refer to the checklists contained in Attachment B. These documents are to be completed by the owner or operator on a monthly and annual basis. All records should be maintained at the Facility for a period of 3 years. b. The inspection checklist may be modified for Tank-specific applicability; however, the inspections must remain substantially equivalent.Deviations or alterations made to STI SP001 Standard monthly and annual inspections that are not substantially equivalent should be discussed in the Facility SPCC Plan. Inspector Recommendations for Continued Tank Service The following recommendations are based on good engineering practices to extend the useful life of the Tank and to limit minor leaks and spills during operation of the Tank. 1. Test and adjust(if necessary)the overfill prevention shutoff valve annually in accordance with manufacturer procedures. 2. Periodically check for water inside the primary compartment and interstitial area consistent with the monthly and annual inspections. 3. Provide training for personnel performing the monthly and annual inspections to include identification of the applicable Tank equipment and proper completion of the forms. 4. Properly label the Tank consistent with local Fire Code which may include NFPA diamonds, warnings, and description of contents. Suitability for Continued Service The following inspection actions are required as a Category I Tank: 20-year formal external inspections and periodic(monthly/annual)visual inspections. Federal, state and/or local regulations may require more frequent inspections of the Tank. Based on the STI criteria and results of the current external inspection, items 1-4 under Recommendations for Continued Tank Service must be completed for Condor to formally approve the continued use of the 1'y i�1 CONDOR