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CHRONOLOGY <br /> NORTH STOCKTON AUTO SERVICE <br /> $709 N. DAVIS ROAD <br /> i <br /> STOCKTON CA 95209 <br /> 05/26/00 One 55-gallon waste oil underground storage tank removed this date <br /> under permit and inspection by PHS/EHD. 'Soil samples for analysis were <br /> collected from the bottom of the tank pit. Analytical results were positive <br /> for petroleum hydrocarbons, tetrachloroethane and 1,1,1-trichloroethane. <br /> I <br /> 06/29/00 Prop 65#00-051 filed this date. <br /> 07/20/00 UST Unauthorized Release form UAR#00=U13 filed this date. <br /> 07/21/00 Notice of Responsibility sent this date to Edward Niemann. <br /> 09/11/00 Five geoprobe soil borings advanced this date. Probes encountered <br /> refusal at approximately 17-feet bsg, no water sample collected. <br /> 11/08/00 Over-excavation of approximately 165 cubic yards of soil from the former <br /> tank pit area. Soil samples were collected from the sidewalls and bottom <br /> of the excavation. Analytical results were negative for all constituents. <br /> 11/15/00 Notice of Responsibility sent this date to Henry and Hilda Niemann. <br /> 01/12/01 Soil boring by hollow stem auger to collect a grab groundwater sample. <br /> Analytical results were.positive for volatile organic compounds. <br /> 06/20/01 Installation of one shallow groundwater monitoring well.. <br /> 06/25/01 Groundwater monitoring and sampling event occurred this date. <br /> Analytical results negative for all constituents except 2.2 ppb chloroform. <br /> 08/22/01 Second groundwater monitoring and sampling event occurred this date. <br /> Analytical results negative for all constituents. <br /> 09/13/01 Request for case closure. <br /> . i <br />