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In-Service AST Inspection Report Formal External Inspection of 8,500 Gallon Tank(AST-6) Valley Pacific Petroleum Services,Inc. Page 3 1.4. The age of the tank, February 1992, was established using a UL/manufacturer nameplate observed on the tank. 1.5. The fabrication of AST-6 was inspected using STI SP001 and UL 142 guidelines and national standards as a baseline. 1.6. The tank foundation was inspected for indications of settlement, cracking, exposed rebar, and general disrepair. Cracks were observed in the concrete floor; however, due to water in the containment area,further investigation of the cracks was not possible. 1.7. The tank's steel supports were inspected for indications of cracking, spalling, and general disrepair. The supports are equipped with steel saddles welded and sealed to the tank surface limiting corrosion potential between the saddles and tank surface.The supports and saddles appear to be in fair condition and secured to the foundation with bolts. 1.8. The single-wall tank is located within a masonry block/concrete secondary containment structure with sufficient capacity for the entire tank contents.The tank is elevated providing a suitable Continuous Release Detection Method(CRDM). 1.8.1. The secondary containment structure was inspected for indications of settlement, cracking, exposed rebar, and general disrepair. Minor cracks were noted in the concrete floor; however, water in the containment area prevented further investigation of the cracks severity. 1.8.2. The secondary containment structure was inspected for foreign materials and for liquid in the containment area. Pooled liquid was present and likely a result of recent rain activity.Depth of the water in containment ranged from 6"to 12"deep. A spotty sheen was observed on the water surface. 1.8.3. The secondary containment walls and drain valves were inspected for penetrations. Drain valves were not observed and the containment walls showed no signs of penetrations through the secondary containment that may compromise the integrity of the containment area. A square sump without a pump was identified along the southwest end of the containment structure. Further inspection of the sump was obstructed by the water in containment. 1.9. Ancillary equipment was inspected for condition and operability. 1.9.1. Piping and piping connections were inspected for visible signs of stress or leakage such as severe corrosion, rusted bolted connections, or other severe degradation. Piping and piping connections were observed to be in good condition. ASTs have specific fittings that are generally accepted per industry standards or are required by applicable regulations. The following observations were made of fittings installed on AST-6: • Three topside 4-inch National Pipe Thread (NPT) couplers reduced to 2-inch pump connections. • Three topside 4-inch NPT couplers to 4-inch "T" fittings reduced for 3-inch fill pipe connections and reduced for 2-inch observation ports/loose fill fittings. • Three topside 4-inch NPT couplers reduced to 3/4-inch fittings for liquid level gauges. • Three topside 4-inch NPT coupler reduced 2-inch normal vent riser pipes with screen vent caps. • Three topside 24-inch long-bolt manways — approved for emergency release ventilation(ERV) • Two top side center of tank lift points. • Two bottom side 1-inch NPT couplers with gate valves located below each tank head. 1� i� CONDOR