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f <br /> CHRONOLOGY <br /> 225 S. CHEROKEE LANE, LODI <br /> 7/13/98 A "No Further Action Required" (NFAR) letter was provided on this <br /> site for underground storage tanks (UST's) removed in September <br /> 1988 and June and July of 1991 (3 gasoline UST's and 3 waste oil <br /> UST's). EHD approved ARCO's request to not destroy the three on <br /> site monitoring wells and 10 vapor extraction wells. The three off <br /> site vapor wells were destroyed. In July 1991 four new gasoline <br /> UST's had been installed in an area east of the former gasoline <br /> UST's. <br /> 8/15-20/02 The four gasoline UST systems installed in July 1991 were <br /> removed. Prior to the removal of these UST's, ARCO submitted a <br /> soil excavation plan to remove contaminated soil should it be <br /> necessary. <br /> 8/23/02 Soil staining and odor were observed in the northeast corner of the <br /> UST area so an area approximately 10 feet by 10 feet in the <br /> northeast corner of the UST excavation was further excavated to a <br /> depth of 20 feet. This generated about 45 tons of contaminated <br /> soil. Soil samples were collected from the sidewalls and bottom of <br /> this area. EHD requested the on site monitoring wells be sampled <br /> and that analysis for 1,2 DCA be included since it wasn't analyzed <br /> for prior to the July 1998 NFAR letter. <br /> 12/27/02 Date of EHD letter stating that results of groundwater samples <br /> collected on 10/3/02 were similar to the March 1994 through <br /> November 1996 water sample results except that 1,2 DCA was <br /> detected. The letter directed further sampling and analysis of the <br /> monitoring well water and stated that further investigation would be <br /> required if 1,2 DCA was over the Maximum Contaminant Level for <br /> drinking water. <br /> 11/17/03 Date of EHD letter directing that a work plan for investigation of the <br /> extent of the 1,2 DCA be submitted. <br /> 11/25/03 Reopened the UST case in Geotracker since the 1,2 DCA would be <br /> from the UST's removed in 1991. <br /> 12/4/03 Date a Notice of Responsibility was sent to the responsible parties. <br /> 3/22-23/04 Soil borings B25 through B27 were installed. There were no <br /> contaminants in the soil but groundwater from B25 had 1,2 DCA. <br />