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Table 5 <br /> Historical Groundwater Sample Oxygenates Analytical Results <br /> The Earthgrams Company <br /> Stockton, California <br /> Monitoring Sampling Concentration (ug/L) <br /> Well ID Date TBA MTBE DIPS ETBE TAME <br />' MW-11 10/23/97 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 05/21/98 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 05/28/99 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br />' MW-12 10/23/97 ND(20) ND(5 0) 79 ND(5 0) ND(5 0) <br /> 01/29/98 ND(20) ND(5 0) 13 ND(5 0) ND(5 0) <br /> 05/21/98 ND(20) ND(5 0) 11 ND(5 0) ND(5 0) <br /> 10/28/98 ND(20) ND(5 0) 12 ND(5 0) ND(5 0) <br /> 05/28/99 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 08/18/99 ND(20) ND(5 0) 26 ND(5 0) ND(5 0) <br /> ' MW-13 10/23/97 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 01/29/98 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 10/28/98 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 05/28/99 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 08/18/99 ND(20) ND(5 0) ND(5 0) ND(5 0) ND(5 0) <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 /> SPA 08/18/99 "ND (500) -ND(120) "ND(120) `ND(120) -ND(120) <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 /> PZ-2 08/18/99 *ND (2,000) *ND (500) "ND(500) *ND(500) *ND (500) <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 Iter <br /> ND Not detected at or above laboratory detection limit <br /> shown in parentheses (using USEPA Method 8260) <br /> E 1121382\1259971oxygenat As <br />