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r <br /> Table 5 <br /> Historical Groundwater Sample Oxygenates Analytical Results <br /> The Earthgracns Company <br /> Stockton, California <br /> Monitoring Sampling Concentration (ug/L) <br /> Well ID Date TBA MTBE DIPE ETBE TAME <br /> PZ-1 08/18/99 "ND(1,000) -NO(250) `ND (250) -ND (250) "ND (250) <br /> 11/08/99 ND(5) ND(0 5) 920 ND(0 5) ND(0 5) <br /> 03/13/00 ND(20) ND(5 0) 1200 ND(5 0) ND(5 0) <br /> 07/02/00 ND(20) ND(5 0) 1700 ND(5 0) ND(5 0) <br /> 10/18/00 44 ND(5 0) 14000 ND(5 0) ND(5 0) <br /> 01/18/01 ND(20) ND(5 0) 5300 ND(5 0) ND(5 0) <br /> 04/20/01 20 ND(5 0) 1900 ND(5 0) ND(5 0) <br /> 07/18/01 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> PZ-2 08/18/99 `NO (2,000) -ND (500) "ND(500) !ND (500) -NO (500) <br /> 11/08/99 ND(5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) <br /> 03/13/00 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 07/02/00 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 10/18/00 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 01/18/01 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 04/20/01 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 07/19/01 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> TBA Tertiary Butyl Alcohol <br /> MTBE Methyl Tertiary Butyl Ether <br /> DIPE Di-isopropyl Ether <br /> ETBE Ethyl Tertiary Butyl Ether <br /> TAME Tertiary Amyl Methyl Ether <br /> ug/L Micrograms per liter <br /> ' <br /> NO Not detected at or above laboratory detection limit <br /> shown in parentheses (using USEPA Method 8260) <br /> Oxygenate detection limits elevated due to gasoline interference <br /> i <br /> r <br /> 1 <br /> 1 <br /> r <br /> env/624001321121382eg/stockton/oxygenat <br />