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CHRONOLOGY <br /> -6- <br /> 04-06-88 Tesoro leak/spill report concludes hydrocarbon contamination is <br /> coming from the north (Time Oil) and west (SFPP pipelines) and <br /> migrating onto Tesoro property. The work plan suggests contin- <br /> ued monthly monitoring of product thickness and water levels, <br /> atatrencheseTSe8, TS19, TS-10Maand a98montoring wells Meltand <br /> M-2 for one year. Monitoring results would be submitted four <br /> weeks after each sampling. <br /> 04-14-88 Time Oil leak/spill report says source has not been identified. <br /> The work plan recommends continued pumping of recovery trench <br /> and monitoring of wells and piezometers. <br /> 04-18-88 PS states staff has been provided with a technical report from <br /> each tenant as required by 03-17-88 letter and requests com- <br /> ments on above leak/spill reports. <br /> 04-29-88 Time Oil letter confirms verbal report of 250-gallon gasoline <br /> spill at PS. <br /> 04-29-88 SJLHD transmits Prop. 65 notification regarding Time Oil gaso- <br /> line spill. <br /> 05-04-88 SJLHD reports water line break next to SFPPL manifold which <br /> flooded Time Oil property causing some fuels to be discharged. <br /> 05-11-88 Unocal proposes to start 11 June 1987 work plan. Staff gives <br /> verbal approval. <br /> 05-19-88 DA letter to staff requests update on Time Oil , et. al. gaso- <br /> line spill . <br /> 06-07-88 PS submits a work plan prepared by the Technical Committee (TC) <br /> for continuation of of Phase III work. The work plan proposes <br /> well/piezometer development and ground water sampling. <br /> 06-24-88 "Letter Report, Observation Well Installation and Ground Water <br /> Sampling, Union Pacific Railroad, Stockton Facility, Stockton, <br /> CA, " 24 June 1988 (received 23 February 1989), prepared by <br /> Dames and Moore, assesses potential for ground water and soil <br /> contamination associated with Union Pacific's operations, <br /> includes field investigation results. <br /> 08-22-88 Kleinfelder letter transmits results of monitoring well purge <br /> water taken at Unocal and requests advise on disposal . <br /> 09-01-88 Unocal problem assessment report describes using nine soil <br /> borings and seven wells, and proposes to identify and eliminate <br /> contamination source prior to ground water extraction for plume <br /> control . <br />