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0 0 HAZARDOUS WASTE TANK ASSESSMENT FINDINGS The waste oil tank (tank) appears to be made of carbon steel or equivalent and the thickness of the tank is unknown. There is no piping, pumps or other ancillary equipment associated with the tank. The capacity of the tank is 550 gallons and situated horizontally within a one-piece fiberglass secondary containment system with an approximate 750 -gallon capacity. Refer to Photograph No. 1, Attachment A. There were no obvious weld cracks, seam cracks, scraps of protective coating or signs of corrosion associated with the tank or the secondary containment system noted during on site visual observations. There were no obvious cracks in the concrete pavement supporting the tank. The tank itself and the secondary containment system do not have leak detection systems; however, the tank and secondary containment system is inspected daily and documented accordingly. The tank is located beneath a roofed area protecting the tank and secondary containment system from rainfall and ultraviolet light. The tank has tie -down straps to secure the tank from movement but the tie -down straps were missing nuts and bolts. The tank is protected from vehicles by a metal frame surrounding the tank that allows access to the top of the tank for oil filter crushing and container draining. There is no ancillary piping associated with the tank. There is a steel grate on the top of the tank with steel rods used to support used oil containers in the upside down position while draining residual oil from the containers. Oil drains from the containers, and crushed filters, into a galvanized metal funneling channel located beneath the steel grate. The funneling channel is used to direct the drained oil into the tank. Only qualified WMI employees are authorized to empty waste oil containers and crush oil filters. Waste oil is manually poured from the residential collection container onto the funneling channel which then flows into the waste oil storage tank. The diameter of the opening on the top of the tank (that receives the funneling channel's down spout) is slightly larger than the down spout by almost an inch. Refer to Photograph No. 2, Attachment A. The tank opening where the funneling channel spout enters the tank and the tank opening surrounding the funneling channel spout are open to atmosphere. The age of the tank is unknown, and according to Mr. Mike Abood, Transfer Station Supervisor, the tank may have been purchased in 2002 by prior WMI management through Evergreen. Furthermore, Mr. Abood was not aware of the tank manufacturer or specifications for the tank. Hazardous Waste Oil Tank Assessment Report 2 NES Inc. Waste Management, Inc. - Central Valley Waste Transfer Station NES Projecl Number 289.EC743.00 Lodi, California