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Februaiy 6 1997 <br /> haue <br /> Underground Fuel Storage Tani. Removal <br /> Two USTs were removed from the site on November 26, 1996 The tanks were removed <br /> by Aronson Engineering, Inc (Aronson) of Rancho Cordova California The removal of <br /> the USTs was observed by Mr Tim Ripp of PACIFIC Mr Mike Infurna of the San <br /> Joaquin County Public Health Services - Environmental Health Division (SJCEHD) <br /> Mr Ed Ralston of Unocal, and Mr Tom Stoflet of Thomas and Associates, Inc (Thomas) <br /> of Clayton California on behalf of Wells Faro Bank Chief William Robinson of the City <br /> of Tracy Fire Department was also in attendance for a portion of the tank removal <br /> activities <br /> Prior to removal, the USTs we]e triple-rinsed by Erickson, Inc (Erickson) of Richmond <br /> California, and tnerted with dry ice by Aronson Measurements of the lower explosive ]]ntit <br /> and oxygen content of the tanks were collected prior to removal, to verify a minimal risk of <br /> accidental combustion <br /> Each of the removed USTs were constructed of single-wall, riveted steel with a nominal <br /> 550-gallon capacity Each of the removed USTs were 38 inches in diameter and <br /> 117 inches long A hole approximately 112 inch in diameter was observed in the bottom of <br /> the southern portion of the western UST, referred to as "Tank 1" by SJCEHD The upper <br /> surface of the southern portion of Tank I was perforated with small holes over an area <br /> measuring approximately 10 inches in length and 6 inches in width <br /> At least four holes were observed in the bottom of the southern end of the eastern tank, <br /> referred to as"Tank 2" by SJCEHD The largest of the holes measured approximately <br /> 1-112 inches in diameter <br /> Following removal of the USTs, the excavation measured approximately 9 feet in depth <br /> Soil sampling was attempted in the excavation, however, representative soil samples could <br /> not be collected due to the presence of an east-west trending, 18-inch diameter storm drain <br /> within the excavation In a field discussion between the on-site representatives of <br /> SJCEHD, Unocal and Wells Fargo, it was agreed that a groundwater monitonng well <br /> would be installed between the fill ends of the two removed USTs, and that soil samples <br /> from the bonng for this well would satisfy the requirement for UST removal compliance <br /> soil sample collection <br /> On November 26, 1996, additional excavation was performed in the area of the two <br /> removed USTs to removed hydrocarbon-impacted soils The final excavation was <br /> approximately 18 feet in length and J2 feet in width A maximum depth of approximately <br /> 13-112 feet was achieved in the southern portion of the excavation Approximately 70 to <br /> 75 cubic yards of soil were removed from the excavation <br /> �i <br /> 3100971 B/i2EPORT DOC <br />