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v REPORT OF TANK CLOSURE FEBRUARY, 1996 152 EAST 11TH STREET, TRACY, CALIFORNIA BACKGROUND A former gas station located at 152 East 11th Street, Tracy, California had underground gasoline storage tanks removed in the mid 1980's. During preparation for a soil and groundwater remediation the existence of a waste oil tank was confirmed by excavation of the fill and identification of the tank location. The tank was determined to be a 550 gallon tank and was dipsticked to reveal that it was approximately one third full of waste oil. WORK PERFORMED The waste oil was pumped out by Asbury Environmental Services on February 13, 1996. Approximately 180 gallons were removed and recycled. A copy of the waste oil disposal records are attached. Permits for removal of the waste oil tank were obtained from San Joaquin County Public Health Services Environmental Health Division and the City of Tracy. A one time site identification number CAC001108360 was obtained from the California Health Services prior to the start of work. See the Appendix for copies of the permits. USA Alert was contacted to locate utility lines on the property prior to the start of excavation. On February 15, 1996 the tank was exposed and prepared for removal. Following exposure of the tank 10 pounds of dry were added to inert the tank prior to removal. The LEL was checked and determined to be less than 10% and the oxygen content was less than 1 %. At that point the tank was removed and loaded on the H & H Environmental truck for shipment to their facilities for cleaning and disposal. Attached is a copy of the manifest for the tank and the hydraulic hoist which was removed at the same time. Prior to shipment off site Ms. Linda Turkette of San Joaquin County observed the condition of the tank pit and tank bottom which were both photographed. Immediately upon removal of the tank, soil directly beneath the tank was removed with an excavator at a depth of about 7 feet. There were no signs of leakage and no odor associated with this soil. A soil sample was taken by driving a brass tube into the soil in the excavator bucket removed from beneath the tank. The sample was cooled and delivered to Chroma Lab for analysis on February 16, 1996. See the attached chain of custody.