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TABLE 10 HISTORIC RESULTS FOR WATER SAMPLES COLLECTED DURING PREVIOUS INVESTIGATIONS-BTEX PG&E Former Tracy MGP Site Tracy,California c C C N y Previous Sample Sample Sample ID Location „ Investigation Matrix Date op c 0 )( t w mg/L mg/L mg/L mg/L OW-2 CUST A3 Water 4/5/1994 0.0045 ND<0.0005 0.0019 ND<0.0005 OW-2* CUST A3 Water 4/5/1994 0.0040 ND<0.0005 0.0017 ND<0.0005 OW-2 CUST A3 Water 9/29/1994 0.0016 0.0008 0.00053 ND<0.0005 OW-2* CUST A3 Water 9/29/1994 0.0026 0.0013 0.00088 ND<0.0005 OW-2 CUST A3 Water 2/14/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2* CUST A3 Water 2/14/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2 CUST A3 Water 5/19/1995 ND<0.0005 ND<0.0005 I ND<0.0005 ND<0.0005 OW-2* CUST A3 Water 5/19/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2 CUST A3 Water 8/8/1995 0.00058 ND<0.0005 ND<0.0005 ND<0.0005 OW-2* CUST A3 Water 8/8/1995 0.00072 ND<0.0005 ND<0.0005 ND<0.0005 OW-2 CUST A3 Water 11/21/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2* CUST A3 Water 11/21/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 1/11/1988 ND<0.0005 0.0010 ND<0.0005 0.0120 OW-3 CUST B3 Water 11/21/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 4/25/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 7/31/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 10/4/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 1/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 4/16/1990 ND<0.0005 ND<0.0005 I ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 7/26/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 10/15/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 1/15/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 4/2/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 7/26/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 9/30/1991 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 OW-3 CUST B3 Water 1/16/1992 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 OW-3 CUST B3 Water 9/29/1994 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-3 CUST B3 Water 8/8/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 1/11/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 11/21/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 4/25/1989 ND<0.0005 ND<0.0005 I ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 7/31/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 10/4/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 1/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 4/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 7/26/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 10/15/1990 ND<0.0005 ND<0.0005 I ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 1/15/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 4/2/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 7/26/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 9/30/1991 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 OW-4 CUST A3 Water 1/16/1992 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 OW-4 CUST A3 Water 9/29/1994 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-4 CUST A3 Water 8/8/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 2/26/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 11/18/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 4/25/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 7/31/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 10/4/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 1/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 4/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-5 CUST A2 Water 1 7/26/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 Page 2 of 3