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i <br /> CHRONOLOGY <br /> WEBER BLOCK SHELL STATION <br /> 141 EL- DORADO STREET - <br /> STOCKTON CA 95202 <br /> 1981 Five gasoline underground storage tanks removed this year. <br /> May 1990 Kleinfelder conducted a soil vapor survey at the site. Petroleum <br /> hydrocarbon contamination evidenced in the samples.analyzed. <br /> 09/05/90 Geoprobe site investigation conducted by Leedshill-Herkenoff; Inc. <br /> Soil contamination confirmed. <br /> 09/07/90 Prop 65 #90-196 filed this date. <br /> 09/21/90 Three groundwater monitoring wells installed on site. Soil and ground- <br /> water contamination confirmed. <br /> 01/02/91 Prop 65 #91-01 filed this date. <br /> 01/09/91 NOR and site letter sent this date to CM Weber Enterprises. J <br /> 03/26/91 - NOR,and site letter sent to Shell Oil Co. as additional responsible party. 1 <br /> 0415-8/91 Two additional groundwater monitoring wells installed on site. <br /> 0418-9191 Three vapor extraction wells installed on site. <br /> 11/07/91 One additional vapor extraction well, and two groundwater extraction <br /> wells installed on site. i <br /> 12/12/91 500-gallon waste oil tank removed this date under permit and inspection. <br /> 01/09/92 Unauthorized Release Report#92-U09 filed this date. <br /> 01/24/92 Soil vapor extraction began this date, utilizing an internal combustion <br /> engine. <br /> March 1992 Soil vapor extraction IC engine replaced with a thermal.oxidation unit. <br /> July 1992 Thermal oxidation unit replaced with activated carbon unit. <br /> 09/3-4/92 Confirmation soil borings C13-1 thru CB-9 advanced this date. <br /> 03/02/93 Groundwater extraction system began, in operation until Sept. 5, 1995. <br /> July 1994 Initiation of air sparging at the site. <br />