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� Table 6 Historical Groundwater Sample Oxygenates Analytical Results The Earthgrains Company-Stockton, California Monitoring Sampling Concentration u /L Well ID Date TBA MTBE DIPS ETBE TAME 1,2-DCA EDB PZ-2 08/18/99 "ND(2,000) `ND(500) -ND (500) "ND (500) -ND (500) NA NA 11/08/99 ND(5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) NA NA 03/13/00 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA ' 07/02/00 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA 10/18/00 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA 01/18/01 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA 04/20/01 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA 07/19/01 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA 10/23/01 ND(2 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) NA NA 01/24/02 ND(2 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) NA NA 04/26/02 ND(20) ND(2 0) ND(4 0) ND(2 0) ND(2 0) NA NA 08/02/02 ND(25) ND(2 5) ND(5 0) ND(2 5) ND(2 5) NA NA 11/05/02 ND(25) ND(2 5) ND(5 0) ND(2 5) ND(2 5) NA NA 02/05/03 ND(50) ND(5 0) ND(10 0) ND(5 0) ND(5 0) NA NA 06/24/04 ND(100) ND(10 0) ND(20 0) ND(10 0) ND(10 0) ND(10 0) ND(10 0) CPT-1@45' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA CPT-1@85' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA CPT-2@44' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA CPT-2@79' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA CPT-3@44' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA CPT-3@76' 05/18/1999 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) NA NA o'(-4"V"% CPT-A@70' `O6/21/200 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ' CPT-A@80' 06/21/200 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) - CPT-A@90' 06/21/200 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) AIQ��J.vj ND(0 5) CPT-A@100' 06/21/200 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ' CPT-C@60' 06/22/2004 ND(50 0) ND(5 0) ND(10 0) ND(5 0) ND(5 0) ND(5 0) ND(5 0) CPT-C@70' 06/22/2004 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) CPT-C@90' 06/22/2004 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ' CPT-C@100' 06/22/2004 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) CPT-F@60' 06/23/2004 ND(50 0) ND(5 0) 37 ND(5 0) ND(5 0) ND(5 0) ND(5 0) ' CPT-F@90' 06/23/2004 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) CPT-F@100' 06/23/2004 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) Cern Well-South 06/24/2004 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ' Cern Well-North 06/24/2004 ND(5 0) ND(0 5) ND(1 0) ND(0 5) ND(0 5) ND(0 5) ND(0 5) TBA Tertiary Butyl Alcohol MTBE Methyl Tertiary Butyl Ether DIPS Di-isopropyl Ether ETRE Ethyl Tertiary Butyl Ether TAME Tertiary Amyl Methyl Ether ug/L Micrograms per liter NA Not Analyzed ND Not detected at or above laboratory detection limit shown in parentheses '0 Oxygenate detection limits elevated due to gasoline interference env/62400132/121382eg/stockton/oxygenat