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oem Mr.Kyung Park October 11,2009 Page 2 of 4 Material thickness and how the thickness was determined: The primary and secondary tanks are steel with a thickness of 10 gauge,according to product specifications. The tank's exterior is painted and in good condition with little visible rust. Primary and secondary tank welds are continuous. Description of the system piping(materials. diameters): Used oil is pumped into the tank from four(4) sliding catch basins(oil drain pans)using a mounted(fixed)air-operated diaphragm pump(Figure 1). The pump transfers waste oil from the basins(when basin drain valves are open)through flexible hosing into two separate 1-inch galvanized piping runs along the ceiling of the basement parallel to the catwalks. The lines merge into one at the western end of the basement before connecting to the pump, and then to the tank via a 2-inch port on the tank. Four(4)separate flexible vehicle differential suction lines also connect to the east-west piping runs(Figure 1). The piping runs are securely anchored to the ceiling via Unistrut channels welded to the ceiling I-beams or bolted to the basement walls. All runs are readily accessible for inspection. Tank suction/discharge piping is 2 inches in diameter and runs from the basement up to a ground level manifold at the southwest comer of the building. Description of any internal and external pumps: One(1)Husky 1040 air-operated diaphragm pump mounted to the wall of the facility is used to fill the tank with waste oil from catch basins or differential suction lines. According to the manufacturer,the pump is rated for use with waste oils. Sketch or drawing of the tank, including the dimensions: The tank dimensions are illustrated on Figure 2. Age of the tank: The tank is believed to be approximately 13 years old; it was placed into service around December 1996 when a certificate of occupancy was granted to the facility. The tank date of manufacture was not listed on the UL identification plate;we understand that the tank was new and unused at the time of installation. Description and evaluation of leak-detection equipment: The tank includes an integrated secondary containment shell with vent and inspection ports that allow monitoring for leaks from the primary tank into the secondary containment. The interstitial space was examined during the inspection and found to be dry with no signs of leaks. No secondary containment tank vent was present. Description and evaluation of corrosion protection equipment: The tank was shop-primed with a corrosion-resistant industrial paint by the manufacturer. Water(including condensation)that may accumulate in the tank is likely removed with the waste oil when the tank's contents are collected for recycling approximately every one to two weeks. The frequent emptying of the tank minimizes potential internal tank corrosion. Description and evaluation of spill-control or overfill equipment The tank is filled through the attached discharge piping from the pump. The tank is fitted with a Skully(uni-gauge) level gauge that is visually monitored to prevent overfilling. A removable graduated stick is also present within the flip-top lid. On a daily basis,technicians read the Skully level gauge and record oil level measurments on an inspection log sheet. Characteristics of the wastes handled: Tracy Express Carwash and Lube is a small-quantity hazardous waste generator facility handling waste oil collected during automotive oil changes. HDR I a'M one c..pm Im yso .