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Chronology <br /> 25775 Patterson Pass, Tracy <br /> Page 3 <br /> 04/24/92 PHS/EHD letter requesting log for on site well and depth to water in the well. <br /> 6/1-3/92 Borings B20-B25 drilled and completed as vapor extraction wells VW10-VW15. <br /> 11/20/92 Received report dated 11/12/92 of borings/vapor wells installed in June 1992. <br /> VW10 screen 10-30 feet VW11 screen 9.5-39.5 feet <br /> VW12 screen 10-25 feet VW13 screen 42-72 feet <br /> VW14 screen 9.5-29.5 feet VW15 screen 44-84 feet <br /> Deepest soil results and total depth: <br /> B20 ND at 51' TD B21 460 ppm TPH at 41.5' TD <br /> B22 350 ppm TPH at 26.5' TD B23 ND at 76' TD <br /> B24 200 ppm TPH at 31.5' TD B25 ND at 90.5' TD <br /> Well log for on site well. Artesian well 1800 feet southeast. Since groundwater <br /> not encountered at 115 feet, first water is below this level. Propose additional <br /> borings and vapor wells. Soil hauled to BFI by Dillard Trucking. <br /> 12/15-22/92 B26 through B28 drilled. B26 -B27 completed as vapor wells VW16-VW17. <br /> VW15 filled with cement from 65-85 feet. B26 drilling difficult (began on 12/14/92 <br /> with hollow stem auger to 85.5 feet, completed with air rotary to 110 feet on <br /> 12/22/92). <br /> 3/23/93 Received report of borings/vapor wells installed December 1992, dated 3/18/93. <br /> VW16 screen 20-40 feet VW17 screen 73-103 feet - contamination at 6 <br /> Deepest soil results and total depth: <br /> B26 .006 ppm Benzene at 110"TD <br /> B27 8800 ppm TPH at 40' TD <br /> B28 .018 ppm Benzene at 71' TD <br /> Soil from borings to be removed by Dillard Trucking. Further off site investigation <br /> proposed. <br /> 6/26 to B29 through B31 drilled and completed as vapor wells VW18-VW20. <br /> 7/5/95 <br />