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DEPTH TO GROUNDWATER: <br /> According to maps published by the San Joaquin County Flood <br /> Control Distract, the water table in this area is about 20' below <br /> ground level. This data correlates well with the water depth <br /> reported during the removal of the tanks. The transmissivity of <br /> the aquifer in this area is not known, but it is possible that <br /> tidal fluctuations may influence water levels. <br /> PRIOR USE OF UST' S: <br /> The tanks were used to fuel company and personal vehicles for <br /> business purposes. They were installed in June, 1974, and were <br /> taken out of service in June, 1994, when they were removed. <br /> There -are no accurate records concerning fuel usage, and inven- <br /> tory tracking reconcilliation was not performed. <br /> LOCATION OF NEARBY WELLS: <br /> According to verbal communication with Margaret Lagorio of the <br /> San Joaquin County EHD, there are no domestic, private, or <br /> groundwater monitoring wells within the zone of influence of this <br /> site. <br /> DETAILS OF TANK REMOVAL <br /> On June 8, 1994, Thorpe Oil Co. removed two (2) 1 , 000 gallon <br /> UST' s which had been used for storing & dispensing unleaded <br /> gasoline. Refer to BY C for a copy of the Application for <br /> Tank Removal & Site Closure. There was a strong petroleum odor <br /> noted during excavation & removal of the tanks, and apparent soil <br /> discoloration_ The piping from the tanks to the dispensing pump <br /> was removed, as well as the pump. No odors or discoloration were <br /> noted in those areas. The .removal of the tanks was witnessed by <br /> Pamela Violett of the San Joaquin County EHD. Soil samples were <br /> taken from the backhoe bucket by Fred Sav, an employee of Geo- <br /> Analytical laboratory, as directed by the County representative. <br /> PLATE IV shows the- locations of those samples_ The results of <br /> the laboratory analyzes are listed on TABLE I; copies of the <br /> laboratory reports are included as EXHIBIT G. The removed spoil <br /> was returned to the hole, and barricades were placed around the <br /> site. Refer to EXHIBIT E for a copy of the tank tracking <br /> records. Copies of the Underground Storage Tank Unauthorized <br /> Release Contamination Report, (094-U32, ) and Notice of Hazardous <br /> Waste Discharge report, (Form EH-22 013, ) are included as EXHIBIT <br /> F. Correspondence from the San Joaquin Co. EHD, dated July <br /> 18, 1994,. requires further assessment work to evaluate possible <br /> 3 <br />