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Covey Auto Express Inc. Stockton,CA 1444 EI Pinal Dr. Stockton,CA 95205 TANK ASSESSMENT WASTE OIL HOLDING AST January 21,2014 Inspection This assessment is for a 480 GA Double Wall Steel Rectangular AST containing Waste Oil located in the shop building's interior northeast corner of Covey Auto Express Inc. Stockton,CA. The facility services truck vehicles including draining and replacing motor oil. Due to business volume they are classified as a "Large Quantity Generator".Tank inspection was by Daniel K. Barber,RCE California and Certified Steel Tank Institute Inspector. Owner Contact: Mike Covey Jr.,Covey Auto Express Inc. (209)464-0016 CONTAINMENT ASSESSMENT The double wall steel AST is located on the finished concrete floor near the east wall of the shop building.The original manufacturer's label is on the tank.The attached UL Tag Number is P794796.The manufacturer's label indicates it was manufactured in Bakersfield,CA in March 2007 by Containment Solutions,Incorporated.The integral secondary containment of the waste oil AST provides secondary containment capacity for failure of the 480 GA"hazardous waste"containing primary tank. Manufacturer's design for the"Eco LubeCube"AST was verified with Elaine at Containment Solutions, (661)399-9556. The subject waste oil AST is supported on the concrete floor with three flat,flanges down 2 inch channel steel skids providing about 0.06 feet of clearance under the exterior tank's shell above the concrete floor, resulting in a visible path in the event of leakage. Collected waste oil is transferred to the AST from a caster mounted collection pan or other containers via an Allemite pneumatic transfer pump with a 1 inch reinforced hose or into an Allemite receiving funnel. There is no method to prevent overfilling in the event of operator inattention, however,the quantities transferred are defined and periodic.With an awareness of the tank's waste oil level,the transfers do not threaten over filling between reclamation pickups.It is possible that the intermittent storage of the suction pipe in the adjacent4 inch opening into the convenient secondary containment has resulted in drainage Into the interstitial cavity to a depth measured at less than a Y.inch.This practice should be discontinued. The floors finished concrete surface and proximity to service technicians provide a Continuous Release Detection Method(CRDM)with visible indication of spillage prior to ground contact.Additionally, ongoing regular monitoring of the secondary interstitial void will alert the operator to failure of the primary tank. Daily observations for visible signs of leakage are to be recorded by Covey Auto Express Inc.staff. Records are to be maintained on site for 3 years.