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OO NVIRONMENTAL S ERVICES, INC. GINEEIRING CONTRACTOR #921:387 May 10, 2021 Sukdev Singh American Tire& Truck Repair 8288 El Dorado St. French Camp, CA 95231 Subject: Hazardous Waste Tank Assessment American Tire & Truck Repair 8288 South El Dorado St., French Camp, CA 95231 Dear Mr. Singh: Cook Environmental Services, Inc. (CES) was retained by American Tire & Truck Repair to assess one above ground storage tank (AST) containing used oil at your facility located at 8288 El Dorado St., French Camp, California. The AST has a volume of 550 gallons and is stored in a metal shed used for truck maintenance and oil changes. An inspection of the AST was conducted by Tim Cook, P.E. of CES and Raman Patel, P.E. of RP Associates Inc. The purpose of the inspection was to assess the current physical condition of the AST system and to gather information required for a Hazardous Waste Tank Assessment (Assessment) pursuant to 22 CCR §66265.192(k). For ease of review, the Assessment is organized in the same order as the checklist provided in 22CCR §66265.192(k). • Tank description, configuration, and gross capacity {22 CCR §66265.192(k)(1)}: The AST is a shop-fabricated horizontal cylindrical type tank manufactured by Mosier Brothers, Inc. of Woodlake, CA. The double -wall steel AST has a capacity of 550- gallons. The tank dimensions are provided in drawing 151D in Attachment A. The tank is located within a metal shed used for oil changes on semi-trucks. • Design standard if available to which tank and ancillary equipment was designed {22 CCR §66265.192(k)(2)1 The AST is constructed and listed in accordance with Underwriters Laboratories, Inc. 550 UL 142 utilizing steel inner and outer tanks. • Material of construction {22 CCR §66265.192(k)(2)(a)) Primary and secondary tanks are constructed of steel. • Material thickness and method used to determine thickness f2 CCR§66265.192(k)(2)(b)} Primary and secondary tanks are 10 gauge (0.1345 inches). • Description of tank system piping (material, diameter) 122 CCR �66265.192(k)(2)(01: The tank is filled through a 2" fill port on top of the tank. The fill port is connected to a 1.5" flexible reinforced hose that connects to the fill port via a 1" steel 90° elbow fitting. The source of the used oil is an oil drain pan. Oil from the pan is pumped to the AST using a double diaphragm pump. The location and size of the various openings on top of 271 LAS JUNTAS WAY * WALNUT CREEK, CA 94S97 * MOB (925).7B7.6B69 * . .