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Table 5 <br /> Historical Groundwater Sample Oxygenates Analytical Results <br /> The Earthgrams Company <br /> 1Stockton, California <br /> Monitoring Sampling Concentration (ug/L) <br /> Well ID Date TBA MTBE DIPE ETBE TAME <br /> ' PZ-2 08/18/99 *ND (2,000) *ND (500) *ND(500) -ND(500) -ND (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 /> 1 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 /> 10/23/01 ND(2 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) <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 /> ND 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 /> env/62400132/121382eg/stockton/oxygenat <br />