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Covey Auto Express Inc. Stockton,CA 1444 EI Pinal Dr. Stockton,CA 95205 TANK ASSESSMENT WASTE OIL HOLDING AST Waste AST 9 3 January 21,2014 Inspection This assessment is for a Red 275 GA Single Wall Steel Oval fUL80) AST containing Waste Oil located in the site's southwest 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 single wall steel AST is located within a concrete block walled basin on PCC concrete pavement.The attached UL Tag Number is 49251. The subject waste oil AST is supported with no anchorage on the concrete floor,with four vertical 1 IN steel pipe legs providing about 0.25 FT of clearance under the tank's shell above the concrete floor, allowing observation In the event of leakage. The block wall containment(10.75'x13.42'x2.79')capacity,3,011 GA less 2.7"precipitation from a 25 year 24 hr.storm event allowance of 243 GA,is 2,768 GA.Assuming the contained ASTs are @500 GA, & 2 @275 GA or a total of 1,050 GA,there is ample capacity. The PCC floor has several construction joints and should be sealed to provide an effective barrier in the event of the waste oil AST failure. Drain 1-1/2 IN coupling at northeast corner should be closed with valve and plug or lock. The floor's finished concrete surface and uncluttered visibility provide a Continuous Release Detection Method(CRDM)with visible indication of spillage prior to ground contact. Collected waste oil is transferred to the AST from a portable collection container.There is no method to prevent overfilling in the event of operator in-attention,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. Record of pickup by Asbury Environmental Service is current and affixed to the AST. 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.Drainage of containment must be witnessed and recorded.