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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 C Previous Sample Sample e ' a Sample ID Location 5 d >, Investigation Matrix Date 0 H t x w mg/L mg/L mg/L mg/L B-1 CUST A3 Water 11/18/1986 31.00 49.00 21.00 22.00 B-2 CUST A3 Water 11/18/1986 3.800 23.00 6.100 12.00 OW-1 CUST A2 Water 1/11/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 11/18/1988 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 4/25/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 7/31/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 10/4/1989 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 1/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 4/16/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 7/26/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 10/15/1990 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 1/15/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 4/2/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 7/26/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 9/30/1991 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 OW-1 CUST A2 Water 1/16/1992 ND<0.0003 ND<0.0003 ND<0.0003 ND<0.0003 OW-1 CUST A2 Water 9/29/1994 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-1 CUST A2 Water 8/8/1995 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2 CUST A3 Water 1/11/1988 0.8500 0.6400 0.0590 3.000 OW-2* CUST A3 Water 1/11/1988 0.6700 0.3500 0.0070 2.700 OW-2 CUST A3 Water 11/23/1988 0.2940 0.1040 0.0340 0.1720 OW-2 CUST A3 Water 4/25/1989 1.540 0.0220 0.0950 0.0110 OW-2 CUST A3 Water 7/31/1989 0.0183 ND<0.0025 ND<0.0025 0.0065 OW-2* CUST A3 Water 7/31/1989 0.0210 0.0040 ND<0.0025 0.0034 OW-2 CUST A3 Water 10/4/1989 0.0334 0.0093 0.0035 0.0037 OW-2* CUST A3 Water 1 10/4/1989 0.0455 0.0099 0.0036 0.0041 OW-2 CUST A3 Water 1/6/1990 0.0404 0.0183 0.0006 0.0105 OW-2* CUST A3 Water 1/6/1990 0.0127 0.0409 0.0021 0.0142 OW-2 CUST A3 Water 4/16/1990 0.1030 0.0123 0.0104 0.0218 OW-2* CUST A3 Water 4/16/1990 0.0878 0.0083 0.0067 0.0191 OW-2 CUST A3 Water 7/26/1990 ND<0.0005 ND<0.0005 ND<0.0005 0.0015 OW-2* CUST A3 Water 7/26/1990 ND<0.0005 ND<0.0005 ND<0.0005 0.0043 OW-2 CUST A3 Water 10/15/1990 ND<0.0005 ND<0.0005 ND<0.0005 0.0013 OW-2* CUST A3 Water 10/15/1990 ND<0.0005 ND<0.0005 ND<0.0005 0.0009 OW-2 CUST A3 Water 1/15/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2* CUST A3 Water 1/15/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2 CUST A3 Water 4/2/1991 0.0480 ND<0.0005 0.0032 ND<0.0005 OW-2* CUST A3 Water 4/2/1991 ND<0.0005 ND<0.0005 ND<0.0005 ND<0.0005 OW-2 CUST A3 Water 7/26/1991 0.0100 0.0029 0.0039 0.0018 OW-2* CUST A3 Water 7/26/1991 0.0130 0.0036 0.0047 0.0012 OW-2 CUST A3 Water 9/30/1991 0.0030 0.00075 0.00 0.00033 OW-2* CUST A3 Water 9/30/1991 0.0034 0.00084 0.00065 0.00035 OW-2 CUST A3 Water 1/16/1992 0.0440 0.0077 0.0057 0.0076 OW-2* CUST A3 Water 1/16/1992 0.0370 0.0065 0.0052 0.0067 OW-2 CUST A3 Water 4/8/1992 0.0370 0.0037 0.0056 0.0064 OW-2 CUST A3 Water 7/20/1992 0.1100 0.0290 0.0210 0.02 OW-2* CUST A3 Water 7/20/1992 0.1100 0.0290 0.0210 0.02 OW-2 CUST A3 Water 10/13/1992 0.1100 0.0390 0.0200 0.03 OW-2* CUST A3 Water 10/13/1992 0.1100 1 0.0370 0.0190 0.03 OW-2 CUST A3 Water 4/12/1993 0.0290 1 ND<0.0005 0.0090 1 0.0033 OW-2 CUST A3 Water 10/5/1993 0.0080 0.0040 0.0042 0.0024 OW-2* CUST A3 Water 10/5/1993 0.0070 0.0035 0.0037 0.0017 Page 1 of 3