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Chronology <br /> 25775 Patterson Pass, Tracy <br /> Page 4 <br /> 8/4/95 Second Quarter 1995 Report of borings/vapor wells installed 6/26-7/5/95. <br /> VW18 screen 43.5-72.7 feet VW19 screen 58-88 feet <br /> VW20 screen 48.5-78.5 feet <br /> Deepest soil results and total depth: <br /> VW18 ND at 76' (80' TD) <br /> VW19 ND at 90.5' (93' TD) <br /> VW20 .009 ppm Toluene at 80.5' (83.5' TD) <br /> S/EHD agreed that the <br /> ass of <br /> on <br /> 2/18/98 remaining ning ag his site sshould be calculated and submitted ted as part of a closure <br /> report. <br /> 10/12/98 Hydrocarbon Mass Evaluation Report. Provides all soil sample results, includes <br /> calculations of the contaminant mass. <br /> 06/15/99 PHS/EHD letter requesting sampling of on site water well and chromatograms of <br /> soil samples be reviewed for MTBE. <br /> 09/10/99 Addendum to Hydrocarbon Mass Evaluation. Provides well log and sample <br /> results from water sample collected 8/19/99 from on site water well (no <br /> contaminants detected). Also includes revised contaminant mass estimate and <br /> chromatogram evaluation for MTBE for prior soil samples where chromatogram <br /> were still available. <br /> 01/21/00 PHS/EHD concurs with no further action required at the site. <br />