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Table 4 Groundwater Monitoring Results-BTEX/TPH as Gasoline Analyses Del Monte Disco Property Stockton,California Concentralion(u ) Sample TPII I Ethyl well Date Gasoline Benzene Toluene benzene Xylenes Dilution Lead TCLP - 500 - - - 51000 MCL 1 1.000 680 1,750 50 MW-DIS-3 07126!1991 09/04/1991 06/30/1992 <0.5 <0.5 10/01/1992 <50 <0.5 <0.5 <0.5 <0.5 NS 0 112 1 11 99 3 X50 <0.5 <0.5 <0.5 <0.5 NS 03n-911993 <50 <0.5 <0.5 <0.5 <0.5 NS 07/20/1993 <50 <0.5 <0.5 <0.5 <0.5 <0.5 09/30/1993 <50 <0.5 <0.5 <0.5 <0.5 NS 01/12/1994 X50 N.5 <0.5 <0.5 <0.5 NS 04/14/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 07/220/19 94 <50 <0.5 <0.5 <0.5 <0,5 10/27/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 03103/t995 <50 <0.3 <0.3 <0.3 <0.3 NS 06/19/1995 <50 <0.3 UM NS 1011811995 X50 <0.3 <0.3 <0.3 <0.3 1:1 NS 02/13/1996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 0 6/0 611 9 96 X50 <0.3 <0.3 <0.3 <0.3 1:1 NS 0811511996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 12020/96* <0.5 <0.5 <0.5 am= 1:1 NS 1 21 2011 996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 4117197 <50 <0.3 <0.3 <0.3 1:1 NS 12/2211997 <50 <0.3 <0.3 c0.3 <0.3 2:1 NS 0 411 6/1 99 8 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 0811 2/1 997 ND ND ND ND ND NS 07123/1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 11/11/1998 <50 <0.3 <0.3 <0.3 <0.3 l:l NS 1 02/10/1999 <50 <0.3 c0.3 <0.3 <0.3 1:1 NS 07116/1999 <50 4.3 <0.3 X0.3 <0.3 1:1 NS I M811999 NS NS NS -.NS NS NS 03/29/2000 <50 <0.3 <0.3 <0.3 1:1 NS 05/25/2000 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 06/28/2000 NS NS NS NS NS NS MW-3 BB 03/29/2000 <50 <0.3 <0.3 <0.3 _ <0.3 1:1 NS MW-DIS-4 09/03/1991 <50 <0.5 <0.5 <0.5 <0.5 4.8 06/30/1992 <50 <0.5 <0.5 <0.5 <0.5 10/01/1992 <50 <0.5 <0.5 <0.5 <0.5 NS 01/21/1993 <50 4.5 <0.5 <0.5 <0.5 NS 03129/1993 <50 <0.5 <0.5 <0.5 <0.5 NS 07/20/1993 <50 <0.5 110.5 <0.5 <0.5 <0.6 09/30/1993 <50 <0.5 <0.5 <0.5 <0.5 NS 01/12/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 04/14/1994 <50 <0.5 <0.5 d1.5 <0.5 NS 07/'-0/1994 <50 <0.5 <0.5 <0.5 <0.5 <0.6 101'27/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 03/03/1995 <50 <0.3 <0.3 <0.3 <0.3 NS 12019196* <0.5 <0.5 <0.5 IMM 1:1 NS 1 2/1 911 996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 4117/97 <50 <0.3 jIMM <0.3 <0.3 1:1 NS 08/12/1997 ND ND ND ND ND NS 12122/1997 <50 114.3 <0.3 <0.3 <0.3 2:1 NS 04/1611998 b0 <0.3 <0.3 <0.3 <0.3 1:1 NS 07123/1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 11/11/1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 02110/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 0711511999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 11/08/1999 NS NS NS NS NS NS 03/29/2000 _ NS NS NS NS NS NS 06/28/2000 NS NS NS NS NS NS Gdalal l-00_ko.xls Page 2of 7 02/07/2001