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Scope of Work On June 7, 2019, Pacific Environmental Systems, LLC performed an external inspection integrity test on the two (2) aboveground storage tanks (ASTs) containing diesel fuel located at Caltrans Stockton Maintenance Station at 1604 South B. Street, Stockton, CA 95206. There are multiple Aboveground Storage Tanks and the ones which were subject to the STI- SP001 form external inspection/integrity tests were the 6000 gal. ConVault Gasoline fuel tank at the fueling platform, and the belly tank fuel tank beneath the Onan Cummins standby generator which sits behind the electricians building in an individual small concrete berm. The inspections were performed in accordance with Steel Tank Institute's (STI) "SP001 Standard for the Inspection of Aboveground Storage Tank" 6a' Edition and also US EPA (40 CFR 112, et seq) testing methods for both tanks and the ConVault approved testing methodology for the ConVault concrete clad Aboveground Storage Tank integrity test procedures. The following summarizes the results of the inspection. Executive Summary ConVault 6000 imL Abovearound Storage Tank: Pacific Environmental Systems, LLC, utilized ConVault Website instructed dipstick method, visual inspection and ConVault sensor- visual approved test methods for the two (2) ConVault tanks. The visual inspection was performed using guidelines outlined in Steel Tank Institute's standard of inspection SP001, 6m Edition.. The integrity testing was via Dipstick-0MNTEC-BOA-PDS discriminating sensor and boroscope camera. Additionally, per the CRDM of this tank system, a visual inspection beneath the tank was conducted,was unobstructed and found no evidence of any issue relating to leaks in the primary tank system. As an additional assurance 1 hr. vacuum was pulled on the interstice. Onan-Cummins Generator System DCAF with Fuel Tank: Pacific Environmental Systems, LLC, utilized STI-SP001 (6th Edition) & US EPA approved testing methods utilizing vacuum pull on the secondary containment and steel thickness measurements to assure that the steel walls of the AST are in excess of minimums;required under Underwriter's Laboratories Standard 142. Additionally, a visual inspection of the area beneath the tank as in accordance with the CRDM for the tank. The visual inspection was performed using guidelines outlined in Steel Tank Institute's standard of inspection SPO01, 6'h Edition.. The integrity testing was via Dipstick— OMNTEC-BOA-PDS discriminating sensor and horoscope camera, in addition to pulling and maintaining vacuum on the secondary containment for a period of 1 hour, with no decay. Additionally, per the CRDM of this tank system, a visual inspection beneath the tank was conducted, was unobstructed and found no evidence of any issue relating to leaks in the primary tank system. Al hr. vacuum was pulled on the secondary containment interstice. The following report includes the findings for the inspection performed This Pacific Environmental Systems, LLC final report has no intent nor represents, in any form, an Engineering Evaluation of the serviceability of the tank structure. The Owner/Operator has final acceptance of inspection data submitted.