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Stockton Dodge Chrysler Jeep Ram, Used Oil Tank, (Facility 11745), 22§CCR 66265.192,August 2018 4.0 Inspection 4.1 Results: 4.1.1 Foundation: The Used Oil tank is sitting on an asphalt foundation.No cracks, spalling or other deficiencies were found in the foundation. The tank is not secured to the foundation by any mechanical means and the seismic evaluation shows no risk of overturning or sliding. The foundation appears to be sufficient to maintain the full load of the tank based upon its many years of service at this location; however,this tank should be resting on a concrete pad. There are four(4) angle iron supports anchored to the asphalt surrounding the tank. See Attachment D.3. 4.1.2 Containment: The Used Oil Tank is a double-walled protected aboveground tank with secondary containment capable of containing 100%of the contents and is intrinsically designed to prevent exposure to precipitation. 4.1.3 Shell: The inner and outer shell are constructed of ten(10) gauge carbon steel of unknown specification. It is a double walled horizontal rectangular design. See Attachment D.1. The shell exterior was visually inspected and appears in satisfactory condition. The coating was inspected for disbonding, adhesion, deterioration, and discoloration (See Section 4.1.6).A visual inspection was conducted over the exterior shell including the shell external welds.No discrepancies were noted on the welds. The Used Oil tank was not labeled in accordance with NFPA 704. 4.1.4 Appurtenances: Inspected and evaluated each tank nozzle in accordance with STI SP-001. Evaluated all nozzles and reinforcement plates for leaks and corrosion.Normal venting is being provided by a 2" Morrison Brothers normally closed vent approximately 5 feet above grade. See Attachments D.5 and D.6. The interstice also has a 2" downdraft vent installed. See Attachment D.10. The primary tank and the annular space are equipment with a Morrison Brothers Fig 244 emergency vent. The Used Oil tank has a Scully Uni- Gauge installed for the purpose of measuring the liquid level installed in both the primary tank and the interstice. See Attachment D.7. The Used Oil tank has a BJ Enterprises Sentry Tank Monitor to help prevent overfills. See Attachment D.9. The tank monitor was operational during the inspection; however, was difficult to hear when next to the Husky 1040 Double Diaphragm Pump located inside the building. This potential problem is further evidenced by the staining around the downdraft vent indicating an overfill. See Attachment D.S. 4.1.5 Painting/Insulation: There are minimal areas of coating failure throughout the shell and roof of the tank. The corrosion is surface-oriented at this time. 5