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Dart Container Corporation In-Service AST Inspection Report Formal External Inspection of AST-1 Page 5 Condor recommends Facility personnel continue the monthly check for water in the Tank or implement an alternative consistent with Section 6.10 of the STI SP001 Inspection Standard. 1.9.4. The single-walled Tank was not equipped with an interstitial observation port. Interstitial monitoring is not applicable to single-walled tanks. 1.9.5. An external overfill prevention device was not installed and an internal overfill prevention device did not appear to be installed at the time of inspection. Overfill prevention was achieved by only filling the Tank to 90 percent total capacity or less. A fill chart specific to the Tank was provided to the inspector for review. The dimensions noted on the chart matched the actual dimensions of the Tank. The fuel delivery driver would observe the Tank’s liquid level gauge during transfers and shut off flow when the level reaches 6 feet, 7.5 inches (9,003 gallons or approximately 90 percent capacity). Condor recommends the Facility provide signage near the liquid level gauge including the liquid level measurement that corresponds to 90 percent Tank capacity, in this case, 6 feet 7.5 inches (9,003 gallons) and include instructions not to fill the Tank past this point. 1.10. Grounding equipment was not observed on the Tank. 1.11. The Tank was equipped with a ladder, handrails, and a platform. The platform and ladder were welded to the shell of the Tank. The equipment appeared to be added after the initial construction of the Tank. Welds of the attachments did not match the welds of the Tank seams or ports. The base of the ladder was bolted into the concrete foundation. The ladder, platform, and handrails appeared to be unpainted steel and completely covered with external corrosion (Photo 13). Shell modifications including the ladder and platform support welds do not to appear to have significantly affected Tank integrity, based on visual inspection. Condor recommends removal of the external corrosion from the ladder, platform, and handrails followed by the application of a protective coating. 1.12. The exterior Tank coating was observed to be in fair condition. Several instances of coating failure with external corrosion were noted (refer to Figure 1 and Photo 14, Photo 15). The occurrences of coating failure did not appear to be severe enough to impact Tank integrity. 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 documentation was not available for the Tank. 2.2. The manufacturer’s nameplate did not include steel thickness. 2.3. The manufacturer’s nameplate did not reference a widely accepted tank construction standard. The Tank’s UL nameplate did not reference a specific tank construction standard. UL 142 is the presumed standard. 2.4. According to several ultrasonic thickness (UT) measurements, the original shell thickness is estimated to be approximately 0.171 inches or 11/64-inch rolled steel with an average thickness of 0.169 inches of remaining steel. The original thickness of the tank’s heads is estimated to be approximately 0.1875 inches or 3/16-inch rolled steel with an average of