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_____________________________________________________________________________________________ <br />_____________________________________________________________________________________________ <br />3032 Marbury Court  Fairfield  California  94533  Phone 707-365-7440 <br />May 22, 2025 <br />Ms. Carol Presto, REHS <br />Environmental Health Department <br />San Joaquin County <br />1868 East Hazelton Ave <br />Stockton, Ca 95205 <br />Subject: Testing and Inspection of Liquid Level Sensing Devices <br />A&A Concrete Supply, Inc. – Stockton Plant SPCCP – <br />Dear Ms. Presto, <br />A series of inspections and tests were performed at the A&A Concrete Supply Inc. - Stockton Plant during <br />development of the Spill Prevention Control and Countermeasure Plan (SPCCP). The inspections of the <br />plant facilities, protocols, and staff training were completed as part of the annual inspection requirements <br />for the oil storage tanks. The diesel fuel tank received an STI SP001 formal internal and external <br />inspection to confirm compliance for its size of 12,000 gallons and age. <br />The SP001 inspection report, attached as part of the SPCCP update, confirmed the liquid sensing devices <br />and venting were tested and the tank was found to be fit for continued service from the annual inspection. <br />In addition, the waste oil, motor oil, and hydraulic oil tanks were inspected and tested for annual <br />compliance. The inspections included internal and external inspections to confirm integrity, clean <br />secondary containment, and that there are no leaks or other issues needing repair. The testing confirmed