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Introduction In accordance with Title 22 of the California Code of Regulations, Chapter 15, Article 10, Section 66265.192 (22 CCR §66265.192), Wood Environment& Infrastructure Solutions, Inc. (Wood) conducted an integrity assessment of the Holt of California (Holt) used oil tank system located at 1521 W. Charter Way in Stockton, California. This written integrity assessment follows a prior assessment conducted by Amec Foster Wheeler Environment& Infrastructure, Inc. (now Wood) in August of 20151. The 2015 assessment was deemed incomplete by the San Joaquin County Environmental Health Department(Department), but deficiencies were not communicated with Holt. The Department recently conducted an inspection and generated a Large Quantity Hazardous Waste Generator Inspection Report (Report) on February 13, 2020 and later amended the Report on February 26, 2020. The Report documented repeat Class II violations to be addressed in the updated integrity assessment. Integrity assessments are valid for a maximum of five (5) years in accordance with 22 CCR §66265.192(h). The regulation (22 CCR §66270.11(d)) requires Holt to have a written hazardous waste tank system integrity assessment performed by a qualified, professional engineer(PE), registered in California. Purpose This document is the updated integrity assessment for the used oil storage tank system located in the 90- day hazardous waste accumulation area at the Stockton Facility located at 1521 W. Charter Way, in Stockton, California. This assessment attests that the tank system has sufficient structural integrity; is acceptable for the transferring, storing, and treating of hazardous waste (used oil); and the tank and containment system are suitably designed to meet the requirements cited above (22 CCR§66265.192). An independent, qualified, PE registered in California, certified the tank system integrity assessment in accordance with 22 CCR§66270.11(d). Assessment Overview Wood conducted an integrity assessment of the tank system which is used for the accumulation of used oil generated by the Earth Moving Division, Ag Service Division, and the Fleet Service Division. The used oil tank integrity assessment consisted of the following elements: • Visual examination of the tank, ports, equipment connections, piping, valves, and ancillary features using the Steel Tank Institute (STI) SP001 monthly and annual inspection checklists as a means for prompting documentation. • Interviews with Holt personnel responsible for operating and maintaining the tank system. • A chemical compatibility review regarding the materials of construction and the storage of used oil. • A secondary containment system assessment regarding the capacity and condition for the containment of releases from the tank and ancillary equipment. • A review of available tank system design drawings and records. Tank System Identification • Tank Name/ Marking: Tank No. 14, 1,000-gallon used oil tank with Underwriters Laboratories Inc. (UL) Control No. 410231 (located on UL plate) • Tank Age: Based on a review of prior reporting (Amec Foster Wheeler Environment& Infrastructure, Inc., 2015), which included input from facility personnel and the manufacturer, and 1 Amec Foster Wheeler Environment& Infrastructure, Inc. Tank and Secondary Containment Assessment Document prepared for Holt of California, Stockton, California, August 21, 2015.