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TABLE 8 HISTORIC RESULTS FOR WATER SAMPLES COLLECTED DURING PREVIOUS INVESTIGATIONS-TPH PG&E Former Tracy MGP Site Tracy,California 6 0 E Previous Sample Sample = Sample ID Location H H a Investigation Matrix Date mg/L mg/L mg/L B-1 CUST A3 Water 11/18/1986 111 NA NA B-2 CUST A3 Water 11/18/1986 190 NA NA OW-1 CUST A2 Water 1/11/1988 ND<0.001 NA NA OW-1 CUST A2 Water 11/18/1988 ND<0.200 ND<0.200 ND<0.200 OW-1 CUST A2 Water 4/25/1989 ND<0.200 ND<0.200 ND<0.200 OW-1 CUST A2 Water 10/4/1989 ND<0.040 NA NA OW-1 CUST A2 Water 1/16/1990 ND<0.020 NA NA OW-1 CUST A2 Water 4/16/1990 ND<0.020 NA NA OW-1 CUST A2 Water 7/26/1990 ND<0.100 NA NA OW-1 CUST A2 Water 10/15/1990 ND<0.100 NA NA OW-1 CUST A2 Water 1/15/1991 ND<0.050 NA NA OW-1 CUST A2 Water 4/2/1991 ND<0.050 NA NA OW-1 CUST A2 Water 7/26/1991 ND<0.050 NA NA OW-1 CUST A2 Water 9/30/1991 ND<0.030 NA NA OW-1 CUST A2 Water 1/16/1992 ND<0.030 NA NA OW-1 CUST A2 Water 9/29/1994 ND<0.050 NA NA OW-1 CUST A2 Water 8/8/1995 ND<0.050 NA NA OW-2 CUST A3 Water 1/11/1988 14.0 NA NA OW-2" CUST A3 Water 1/11/1988 13.0 NA NA OW-2 CUST A3 Water 11/23/1988 0.900 ND<0.200 ND<0.200 OW-2 CUST A3 Water 4/25/1989 1.20 ND<0.200 ND<0.200 OW-2 CUST A3 Water 10/4/1989 ND<0.040 NA NA OW-2" CUST A3 Water 10/4/1989 ND<0.040 NA NA OW-2 CUST A3 Water 1/6/1990 0.138 NA NA OW-2" CUST A3 Water 1/6/1990 0.286 NA NA OW-2 CUST A3 Water 4/16/1990 0.009 NA NA OW-2" CUST A3 Water 4/16/1990 0.009 NA NA OW-2 CUST A3 Water 7/26/1990 ND<0.100 NA NA OW-2" CUST A3 Water 7/26/1990 ND<0.040 NA NA OW-2 CUST A3 Water 10/15/1990 ND<0.100 NA NA OW-2" CUST A3 Water 10/15/1990 ND<0.040 NA NA OW-2 CUST A3 Water 1/15/1991 ND<0.050 NA NA OW-2" CUST A3 Water 1/15/1991 ND<0.040 NA NA OW-2 CUST A3 Water 4/2/1991 0.069 NA NA OW-2" CUST A3 Water 4/2/1991 ND<0.050 NA NA OW-2 CUST A3 Water 7/26/1991 0.051 NA NA OW-2" CUST A3 Water 7/26/1991 0.062 NA NA OW-2 CUST A3 Water 9/30/1991 ND<0.030 NA NA OW-2" CUST A3 Water 9/30/1991 ND<0.030 NA NA OW-2 CUST A3 Water 1/16/1992 0.240 NA NA OW-2" CUST A3 Water 1/16/1992 0.200 NA NA OW-2 CUST A3 Water 4/8/1992 0.180 NA NA OW-2 CUST A3 Water 7/20/1992 0.290 NA NA OW-2" CUST A3 Water 7/20/1992 0.280 NA NA OW-2 CUST A3 Water 10/13/1992 0.380 NA NA OW-2" CUST A3 Water 10/13/1992 0.460 NA NA OW-2 CUST A3 Water 4/12/1993 0.130 NA NA OW-2 CUST A3 Water 10/5/1993 ND<0.050 NA NA OW-2" CUST A3 Water 10/5/1993 ND<0.050 NA NA OW-2 CUST A3 Water 4/5/1994 ND<0.050 NA NA OW-2" CUST A3 Water 4/5/1994 ND<0.050 NA NA OW-2 CUST A3 Water 9/29/1994 ND<0.050 NA NA OW-2" CUST A3 Water 9/29/1994 ND<0.050 NA NA Page 1 of 3