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Table 7 <br /> Historical Groundwater Sample Oxygenates Analytical Results <br /> The Earthgrains Company <br /> Stockton, California <br /> Monitoring Sampling Concentration (ug/L) <br /> Well ID Date TBA MTBE DIPE ETBE TAME <br /> CPT-1 @45' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> CPT-1@85' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> CPT-2@44' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> CPT-2@79' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> CPT-3@44' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> CPT-3@76' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> SP-1 08/18/99 'ND (500) 'ND(120) 'ND(120) -ND(120) 'ND(120) <br /> 11/08/99 ND(20) ND(0 5) 10000 ND(0 5) ND(0 5) <br /> 03/13/00 ND(20) ND(0 5) 9000 ND(0 5) ND(0 5) <br />' 07/02/00 ND(20) ND(0 5) 5600 ND(0 5) ND(0 5) <br /> SP-2 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 /> SP-5 08/18/99 ND (20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> PZ-1 08/18/99 'ND(1,000) "ND(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 /> 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 /> 07/02/00 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 1 TSA 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/stocktonloxygenat <br />