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Ross Robert Truck Repair Used Oil Tank Interim Assessment and Conditional Certification September 14, 2021 6.0 Integrity Testing The integrity assessment is based on ultrasonic steel thickness measurements conducted on July 20, 2021, and visual inspection. The tank was in service at the time of inspection. The interstitial space was observed using a Teslong Digital endoscope. The space appeared dry with no signs of leaking from the primary tank. Steel Thickness Testing: Steel thickness measurements for the primary tank were taken externally of the tank top using an Elcometer MTG6 ultrasonic thickness (UT)meter. The transducer(VC-40772) measures steel and subtracts out coating thickness. The wall thickness of the primary tank measured 0.107 inches. UTG measurements were also taken of the sidewall at the top, middle and bottom of the secondary tank. The secondary tank wall measured 0.106 inches. Both are higher than the minimum design thickness measurements per UL142 of 0.093 inches. Results are presented in Attachment III. Used oil is compatible for storage in steel tanks. Piping: The piping was visually inspected. No signs of weeps, drips, or spills were observed. Seismic/Anchoring findings: The tank is not anchored. The tank does not have anchoring feet. Anchoring is needed per 22 CCR 66265.192. The concrete foundation pad shows no signs of settling, cracking or tilting. The foundation pad is adequate based upon its current condition. The tank is not situated in an area subject to frost heave. A visual inspection of the tank and its affiliated piping and ancillary equipment did not reveal signs of weld cracks or breaks which may cause a release from the tank system to the environment. Some areas of the metal coating on the tank top and along the top of the tank sides is worn off. However, the tank is located indoors and subject to minimal external corrosion. The missing protective coating does not appear to cause a release from the tank at this time. The used oil storage tank consists of an integral double walled tank. The condition of nozzles, flanges and fittings at the tank were in good condition with no cracks or evidence of leakage. The concrete foundation showed no signs of settling, cracking, or tilting. The tank is in a concrete containment area approximately 3'11"x 197"x 8". The area can contain 51.17 cubic feet or 382.75 gallons of liquid. There is debris on and around the tank. The tank area needs to be cleared of any debris. Any absorbent on the floor should be cleaned up. 7.0 Results of Assessment Results of the assessment indicate the following: Required: • Per the California Fire Code, 5704.2.7.3, the primary tank must have a normal (atmospheric) vent. The secondary tank is not required to have a normal vent but is required to have an emergency vent. These two vents need to be installed. • The Hazardous Waste Accumulation sticker is required to have an accumulation start date. • A NFPA 704 diamond sticker with the designation of 1 for Health, 2 for Flammability, 0 for Instability should be added to the tank. • The tank is not anchored to prevent movement during a seismic event. Anchoring is needed per 22 CCR 66265.192. 7