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Gardner Trucking, Used Oil Tank, 22§CCR 66265.192, November 2019 4.0 Inspection 4.1 Results: 4.1.1 Foundation: The Used Oil tank is sitting on a concrete foundation. No cracks, spalling or other deficiencies were found in the foundation. The tank is secured to the wall 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. 4.1.2 Containment: The Used Oil Tank is a double-walled aboveground tank with secondary containment capable of containing 100% of the contents and is intrinsically designed to prevent exposure to precipitation. The interstice was free of any waste. 4.1.3 Shell: The inner and outer shell are constructed of carbon steel of unknown specification, but assumed to be A36 commercial steel. It is a double walled horizontal rectangular design. 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 minimum design thickness requirements per UL-142 for the tank is 0.093". The UT inspection of the tank revealed no indications that the wall thickness has dropped below the design requirements listed in UL-142. Thickness measurements are listed in the engineering data in Appendix B. The Used Oil tank was 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. Both the primary tank and interstice are equipped with a Morrison Bros Fig 244 emergency vent. Every aboveground storage tank shall have emergency relief venting...that will relieve excessive internal pressure caused by an exposure to fire (NFPA 30 22.7.1.1. The Used Oil tank has a Kruger Sentry Gauge installed for the purpose of measuring the liquid level. The gauge was verified to be accurate during the inspection. The Used Oil tank has an auto shut off valve installed to help prevent overfills. This valve will turn off the air supplied by the compressor to the Husky 1050 pump. 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. 4.1.6 Piping: The Used Oil Tank has a 1" carbon steel receipt piping system comprised of multiple elbows, couplers, and a double diaphragm pump. The piping travels up the ceiling to the center of the shop,regularly supported by uni-strut supports. The Graco Husky 1050 Diaphragm Pump is anchored to prevent movement. The installation date of the 5