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In-Service AST Inspection Report <br /> Formal External Inspection of 10,000 Gallon Tank(AST-7) <br /> Valley Pacific Petroleum Services,Inc. <br /> Page 3 <br /> 1.8. The tank is equipped within a secondary containment interstice with an estimated capacity <br /> of approximately 10,000 gallons. Inspection of the interstitial containment area revealed it <br /> to be in good condition. <br /> 1.8.1. No significant breaches or damage were identified with the secondary interstice. <br /> 1.8.2. There were no foreign materials or liquid located within the secondary interstice. <br /> 1.8.3. There were no penetrations through the secondary tank observed that may <br /> compromise the integrity of the interstitial area. <br /> 1.9. Ancillary equipment was inspected for condition and operability. <br /> 1.9.1. Piping and piping connections were inspected for visible signs of stress or leakage <br /> such as severe corrosion, rusted bolted connections, or other severe degradation. <br /> Piping and piping connections near or at the base of the tank were observed to be <br /> in good condition. Piping and piping connections located on top of the tank were <br /> observed to be in good condition. <br /> ASTs have specific fittings that are generally accepted per industry standards or <br /> are required by applicable regulations. The following observations were made of <br /> fittings installed on AST-7: <br /> • Topside of tank with 8-inch emergency relief vent(495,000 CFH). <br /> • Topside of tank with 8-inch pipe and PVC cap exiting topside of tank; option <br /> for secondary tank emergency relief venting. <br /> • Topside of tank weak shell to roof joint weld as primary overpressure relief <br /> for secondary interstice. <br /> • Topside of tank with 3-inch threaded coupler;normal atmospheric vent. <br /> • Topside of tank with 3-inch threaded coupler; liquid level gauge. <br /> • Topside of tank with 3-inch fill pipe and check valve(backflow prevention). <br /> • Topside of tank with 2-inch dispenser pipe and pressure regulator valve; to <br /> pump located near base of tank. <br /> • Topside of tank with 24-inch cleanout manway secured with bolts. <br /> • Side of tank with 2-inch leak detection pipe to interstitial area. <br /> 1.9.2. The tank has a 3-inch diameter normal vent which exits through the top-side of the <br /> tank. <br /> 1.9.3. Pneumatic tank liquid level systems were present and appear to be calibrated. <br /> 1.10. Grounding equipment was not installed on AST-7. <br /> 1.11. The tank was not equipped with stairways,handrails, or platforms. <br /> 1.12. Surface coatings observed on all surfaces of the tank shell, roof, and supports appeared to <br /> be in good condition. <br /> 2. Original Shell Thickness of the AST <br /> 2.1. Original tank documentation was not provided for review. <br /> 2.2. The tank manufacturer was determined by examining the nameplate installed on the tank. <br /> 2.3. The tank's nameplate identifies it with an Underwriters' Laboratories (UL) designation. <br /> This indicates the tank is manufactured to the UL 142 specification for aboveground <br /> storage of flammable liquids <br /> 2.4. The tank is of double-wall construction. According to several ultrasonic thickness (UT) <br /> measurements, the roof original steel thickness is presumed to be about 0.134-inches or <br /> 12-gauge steel. <br /> 3. Vertical ASTs <br /> 3.1. Shell plates, welds, and ancillary equipment were inspected for indications of exterior <br /> corrosion,buckling, distortion due to stress,cracking,pinholes, and mechanical damage. <br /> g <br /> It k <br /> i(? CONDOR <br />