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MEN,- <br /> 4343 Last Fremont Aven* � <br /> Chronology Page 2 <br /> 1986 <br /> 0625-86 One underground storage tank was removed and three soil samples <br /> collected. <br /> S#1 @ 7'9" S#2 @ I V S#3 stockpiled soil <br /> Benzene <5 ppm <5 ppm <5 ppm <br /> Chlorobenzene <0.1 ppm <0.1 ppm <0.2 ppm <br /> 1,2-Dichlorobenzene 0.2 ppm <0.1 ppm <0.2 ppm <br /> 1,3-Dichlorobenzene 0.1 ppm <0.1 ppm 11 ppm <br /> 1,4-Dichlorobenzene <0.1 ppm <0.1 ppm <0.2 ppm <br /> Ethylbenzene <5 ppm <5 ppm 240 ppm <br /> Toluene <5 ppm <5 ppm <10 ppm <br /> Total Volatile Hydrocarbons 260 ppm 7.8 ppm 2200 ppm <br /> Tetrachloroethene 0.47 ppm <0.1 ppm 0.4 pprn <br /> 1,1,1-Trichloroethane 0.49 ppm 0.2 ppm <0.2 ppm <br /> Trichloroethene <0.1 ppm 0.2 ppm <0.2 ppm <br /> Trichlorofluoromethane <0.l ppm 0.4 ppm <0.2 ppm <br /> 1994 <br /> 11-16-94 Two soil borings were drilled B-1 and MW-1, north and south of the former tank <br /> location. See attached table of analytical results and boring logs. <br /> 11-21-94 A groundwater sample was collected for analysis. <br /> 1995 <br /> 06-22-95 A groundwater sample was collected for analysis. <br /> 06-27-95 A confirming groundwater sample was collected without agreement with the June <br /> 22, 1995 sample, but with agreement with the November 21, 1994 sample. The <br /> analytical results are in table form and lab data sheets, all of which are attached. <br /> 1996 <br /> 02-13-96 A revision of the environmental fate analysis was completed and is attached. <br /> 04-04-96 Prepared closure chronology and closure summary. <br />