SITE INFORMATION AND CORRESPONDENCE

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ATTACHMENT A CHRONOLOGY PORT OF STOCKTON 02-02-81 431 barrels of gasoline overflows from a tank at Arco. A fire ensues and a 7,600-barrel tank is destroyed. Unburned gasoline is spilled on the ground. 01-09-83 2,500-gallon gasoline spill at Time Oil is reported to the Stockton Fire Department. 10-10-85 Port of Stockton (PS) letter to Support Terminal (ST) Services states ST activities may have caused shallow ground water contamination, requests information on ground water quality, and steps to be taken to prevent ground water contamination and verify integrity of fuel storage handling operations. 10-16-85 Time Oil Co. sends San Joaquin Local Health District (SJLHD) a plot plan, sample results from extraction wells (for water table depression) , and well logs. Results show benzene at 5,- 600 - 26,000 ppb, toluene at 1,400 - 21,000 ppb, ethylbenzene at <500 - 16,000 ppb, and xylene at 1 ,900 - 16,000 ppb. 05-05-86 An underground tank is removed from ST. BTX, TCE, and PCB are found in the ground water. 05-19-86 SJLHD submits a chronology of its activities regarding fuel to spills, tank removals, etc. at the port. 07-03-86 05-20-86 Weiss Associates transmits results taken at ST showing total hydrocarbons and BTEX contamination in soil and ground water. TCE and PCB were also detected in ground water. June 86 Staff and Department of Health Services (DHS) inspect ST, find evidence of gasoline on the ground and discharge of oil/water separator effluent to ground. 08-08-86 SJLHD submits a chronology regarding its activities on Time to Oil . 01-13-87 08-28-86 San Joaquin County DA files $152.8M suit against ST for the discharge of petroleum products in an unlined pond. 12-04-86 An Exxon underground tank is removed from ST. High levels of TPH and gasoline are found in soils and ground water.