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CHRONOLOGY -2- <br /> 12-15-86 Exxon letter to SJLHD states the underground tank removed from <br /> ST never held gasoline or diesel fuel and showed no signs of <br /> leaks. Thus, ground water contamination could not have come <br /> from the tank. <br /> 01-08-87 Kleinfelder sends work plan to Time Oil . <br /> 01-15-87 Staff memo regarding contamination at Time Oil and verbal <br /> request to Time Oil to summarize data collected to date and <br /> submit a proposal for remedial investigation. <br /> 01-16-87 SJLHD sends staff Time Oil soil and ground water results and a <br /> fuel spill report. <br /> 01-16-87 Staff sends a Prop. 65 notification to SJ County Board of <br /> Supervisors. <br /> 01-23-87 Time Oil transmits to SJLHD 1985 ground water test results and <br /> a map showing well locations. <br /> 01-23-87 Woodward Clyde Consultants (WCC) transmits to SJLHD site plan <br /> of 32 proposed piezometers for determining ground water eleva- <br /> tions, and requests permit approval. <br /> 02-09-87 DHS sends results of DHS samples taken at ST. Results show <br /> contamination by BTX and C8 alkenes. <br /> Feb. 87 ST hooks up oil/water separator to sewer and ceases discharge <br /> of separator effluent to land. <br /> 03-06-87 Bureau of Reclamation letter to San Francisco Bay-Delta Aquatic <br /> Habitat Institute states the need for refineries or terminals <br /> to test for monocyclic aromatic hydrocarbons and metals. <br /> Spring 87 "Work Plan: Phase II Subsurface Investigation, Petroleum <br /> Storage and Handling Terminal , Port of Stockton, Stockton, CA, " <br /> undated, received 27 July 1987, prepared by WCC proposes ex- <br /> ploratory trenching to determine lateral extent of subsurface <br /> hydrocarbons, ground water elevation, and to characterize stra- <br /> tigraphy. Also, proposes to analyze soil samples with an <br /> organic vapor meter (OVM) , identify and sample storm drains, <br /> and sample piezometers. <br /> 04-27-87 Tesoro removes underground tanks, confirms ground water contam- <br /> ination with trichlorofluoromethane, 1 ,2-DCE, motor oil , and <br /> BTEX. <br /> 04-29-87 DA letter to ST attorney proposes a roundtable discussion of <br /> investigation findings and another conference to settle issues <br /> regarding air pollution and fire code violations. <br />