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Table 4 Groundwater Monitoring Results-BTEX/TPH as Gasoline Analyses Del Monte Disco Property } Stockton,California ( Concentration WWI) Sample TPH Ethyl well Date Gasoline Benzene Toluene benzene Xylenes Dilution Lead TCLP - 500 - - - 5,000 MCL 1 1,000 680 1,750 50 MW-DIS-1 06/26/1991 09/04/1991 06/30/1992 07/20/1993 07/20/1994 03/03/1995 NS 06/19/1995 NS 10/18/1995 <3 1:10 NS 02/13/1996 1:50 NS f 06/06/1996 1:200 NS 08/15/1996 1:20 NS 12120196* 1:200 NS I 12/20/1996 1:200 NS 04/17/1997 1:100 NS 08/12/1997 NS 12/22/1997 1:20 NS I 04/16/1998 1:20 NS 07/23/1998 1:10 NS 11/11/1998 1:1 NS 02/11/1999 1:1 NS 07/16/1999 1:20 NS 11/09/1999 1:40a/1200b NS 03/29/2000 1:20a/1:200b NS MW-1 BB 12/22/1997 <50 <0.3 <0.3 <0.3 <0.3 NS 04/16/1998 <50 <0.3 <0.3 <0.3 <0.3 2:1 NS 02/11/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS MW-D15-2 07/26/1991 09/04/1991 06/30/1992 07120!1993 07/20/1994 03/03/1995 NS 06/19/1995 NS 10/18/1995 1:200 NS 10/26/95* NS 1:10 NS 02/13/1996 1:50 NS M 4/19/96* 1:10 NS 06/06/1996 1:20 NS 08/15/1996 1:1 NS 8115196" 1:5 NS 12/20196* 1:5 NS 12/20/1996 1:5 NS i 04/17/1997 1:1 NS 08/12/1997 NS 12/22/1997 1:5 NS 04/16/1998 1:2 NS 07/23/1998 1:1 NS 11/11/1998 <50 <0.3 <0,3 1:1 NS 03/19/1999 1.1 NS 07/16/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS A 11/08/1999 <50 1:1 NS 03/29/2000 <50 <0.3 <0.3 1:1 NS MW-2 BB 12/22(1997 <50 <0.3 <0.3 <0.3 <0.3 NS 04/1611998 <50 <0.3 <0.3 <0.3 <0.3 2:1 NS 04/08/1999 <50 <0.3 <0.3 <0.3 <0.3 0 NS 03/29/2000 <50 <0.3 <0.3 <0.3 <0.3 0 NS I Gdato5-00.xls Page 1 of 7 07/05/2000