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In-Service AST Inspection Report Formal External Inspection of Tank 2 CDCR—NCYCC Page 5 integrity of the Tank. Condor recommends removal of the damaged coating and external corrosion from the Tank followed by the application of a protective coating. 2. Original Shell Thickness of the AST 2.1. Original Tank documentation was not provided for review. 2.2. Examination of the manufacturer's nameplate was possible. However, original thickness information was not included on the Tank nameplates. 2.3. In the absence of the manufacturer information, the inspector could not establish the original documented shell thickness specifications. 2.4. The primary tank could not be accessed to measure the shell thickness in various areas to be used as baseline measurements. 3. Horizontal ASTs 3.1. The shell surface was inspected for indications of exterior corrosion,buckling, distortion, cracking,pinholes,or mechanical damage. The Tank appeared to be in good condition. 3.2. The Tank shell was inspected for indications of modifications that may have been made after its fabrication. The inspector did not identify indication of modification after fabrication. 4. Double-Wall and Double-Bottom Tanks 4.1. The Tank was not equipped with automatic leak detection equipment. It had a manual observation port for checking the condition of the interstitial area. 4.2. The inspector accessed the observation port to check for the presence of water or other materials in the interstice. The interstitial area appeared to be dry and free of liquid(water or product). As a result, leak tests or thickness measurements of the secondary tank were not necessary. 4.3. Thickness measurements are not required for the primary (inner) tank. Some external corrosion was identified; thickness of the secondary (outer)tank in the areas of corrosion was measured (see Figure 1) and from unaffected areas for comparison. Steel thickness measurements from several areas of coating failure were similar to the steel thickness measurements of areas where coating was intact.Coating failure in the areas measured,did not appear to have impacted the integrity of the Tank. 3.2 INSPECTION SUMMARY Leak Testing The formal external inspection of the Tank indicated that supplemental leak testing was not necessary. Requirements for Continued Tank Service The STI SP001 Standard requires the owner or operator of an aboveground tank to perform and document monthly and annual inspections. Refer to the checklists contained in Attachment B. These documents should be completed by the owner or operator on a monthly and annual basis as part of the Facility's Spill Prevention, Control, and Countermeasures(SPCC)Plan. The following requirements are based on the industry standards SP001, UL 2085, UL142, and good engineering practices. These requirements limit potential for catastrophic discharges during operation of the Tank: �� CONDOR