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LOCATION OF NEARBY WELLS: It is not known if there are any domestic or private wells within the zone of influence; we have not had sufficient time to awake a search of the records. We will do so prior to preparing the report covering this proposed work PRIOR USE OF REMOVED UST: The tank had been used to store leaded & unleaded gasoline: for use in company vehicles. There are no records available showing gallonage purchased or used. Based on the best information available, the tank was probably installed in the late 1950 ' s or early 1960' s by a previous owner. BRIEF REVIEW OF PRIOR EVENTS: On August 27, 1986, a tank removal plan was filed with the San Joaquin Local Health District by ARC Pump & Welding Shop; see EXHIBIT D for a copy of that plan. On June 3, 1987, the UST was removed under the direction of the San Joaquin County Local Health District & the city fire department. Refer to EXHIBIT E for a copy of the inspection report A soil sample was taken at 14 1/2' beneath the center of the site of the removed tank by an employee of Canonie Environmental. It was reported that there was a petroleum odor noted in the soil sample Instructions were given to test for BTX (EPA 8020, ) ethylene dibromide (EPA 8010, ) TPH (EPA 8015M, ) & total lead. The results, summarized on TABLE I , revealed the following: benzene - 28 mg/kg, toluene - 820 mg/kg; xylene - 1200 mg/kg; EBD -- ND, TVPH - 3800 mg/kg; and total lead - 24 mg/kg. A copy of the laboratory report is included as EXHIBIT F. An Underground Storage Tank Unauthorized Release /Contamination, Site Report was issued on May 18, 1988 covering the event. That document is attached as EXHIBIT G The excavation was filled with 12 yards of soil , (refer to EXHIBIT H; ) the removed spoil was stored on site, covered with plastic A recent field inspection revealed that the spoil is still on site, covered with black plastic_ On March 8, 1994, the San Joaquin County PAS, EHD issued a letter to the owners informing them site closure could not be approved and that a soil/groundwater investigation would be required. Information was furnished on applying for the SWRCB "Petroleum Underground Storage Tank Cleanup Fund. " A copy of that letter is attached as EXHIBIT A. On November 28, 1994, the San Joaquin County PHS, EHD again wrote to the owners, stating that a workplan for investigating the extent of contamination at the site must be submitted to the 3