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TABLE 10 <br /> HISTORIC RESULTS FOR WATER SAMPLES COLLECTED DURING PREVIOUS INVESTIGATIONS-BTEX <br /> PG&E Former Tracy MGP Site <br /> Tracy,California <br /> c <br /> C C N y <br /> Previous Sample Sample e ' a <br /> Sample ID Location <br /> Investigation Matrix Date d cpp H 5 x <br /> t <br /> w <br /> mg/L mg/L mg/L mg/L <br /> OW-5 CUST A2 Water 10/15/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-5 CUST A2 Water 1/15/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-5 CUST A2 Water 4/2/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-5 CUST A2 Water 7/26/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-5 CUST A2 Water 9/30/1991 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 <br /> OW-5 CUST A2 Water 1/16/1992 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 <br /> OW-5 CUST A2 Water 9/29/1994 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-5 CUST A2 Water 8/8/1995 ND<0.0005 ND<0.0005 I ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 2/26/1988 ND<0.0005 0.0010 ND<0.0005 0.0020 <br /> OW-6 CUST A3 Water 11/21/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 4/25/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 7/31/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 10/4/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 1/16/1990 ND<0.0005 0.0011 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 4/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 7/26/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 10/15/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 1/15/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 4/2/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 7/26/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 9/30/1991 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 <br /> OW-6 CUST A3 Water 1/16/1992 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 <br /> OW-6 CUST A3 Water 4/8/1992 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 <br /> OW-6* CUST A3 Water 4/8/1992 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 <br /> OW-6 CUST A3 Water 7/20/1992 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 10/13/1992 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 4/12/1993 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6* CUST A3 Water 4/12/1993 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 10/5/1993 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 4/5/1994 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 9/29/1994 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> OW-6 CUST A3 Water 8/8/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> TW-1 SI E2 Water 11/23/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> TW-2 SI C1 Water 11/23/1988 ND<0.0005 ND<0.0005 ND<0.0005 0.0014 <br /> TW-3 SI Al Water 11/23/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> TW-4 SI Al Water 11/23/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 <br /> = Duplicate Sample <br /> BTEX=Benzene,Toluene,Ethylbenzene and Xylenes <br /> CUST=Characterization of the Tracy Service Center Underground Storage Tank,(PG&E,June 27,1988) <br /> SI=Site Investigation for the Tracy Manufactured Gas Plant Site(PG&E,April 1989) <br /> Values in BOLD text are detected concentrations above the reporting limit <br /> NA=Not Analyzed <br /> ND< =Non Detect at Reporting Limit <br /> mg/L=milligrams per Liter <br /> Page 3 of 3 <br />