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Table 4 Groundwater Monitoring Results-BTEXITPH as Gasoline Analyses Del Monte Disco Property Stockton,California 1 Concentration(u ) _ Sample TPH Ethyl Well Date Gasoline Benzene 'Toluene benzene X lenes Dilution Lead TCLP - 500 - - - 5,000 MCL - 1 1,000 680 1,750 50 MW-DIS-5 09!04/1991 <50 <0.5 <0.5 <0.5 <0.5 <L6 06130/1992 <50 <0.5 <0.5 <0.5 <0.5 03/03/1995 <50 <0.3 <0.3 <0.3 <0.3 NS 12!22!1997 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 04/16(1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/22/1998 <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 03119/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/15/1999 <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 06/2812000 NS NS NS NS NS NS MW-51313 01/10/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS MW-DIS-6 09/03/1991 <50 <0.5 <0.5 <0.5 <0.5 <0.8 06/30/1992 <50 <015 <0.5 <0.5 <0.5 10/01/1992 <50 <015 <0.5 <0.5 <0.5 NS 01/21/1993 <50 <0.5 <0.5 <0.5 <0.5 NS 03/29/1993 <50 <0.5 <0.5 <0.5 <0.5 NS 070-0/1993 NS NS NS NS NS <0.6 09/30/1993 <50 <0.5 <0.5 <0.5 <0.5 NS 01/11/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 04/14/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 07120/1994 <50 <0.5 <0.5 <0.5 <0.5 <0.6 10/27/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 03/03/1995 <50 <0.3 <0.3 <0.3 <0.3 NS 12/22/1997 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 04116/1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/22/1998 <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 02/1011999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/15/1999 <50 <0.3 <0.3 4.3 <0.3 1:1 NS I1/08t1999 NS NS NS NS NS NS 03/29/2000 NS NS NS NS NS NS 06/28/2000 NS NS NS NS NS NS MW-DIS-7S 09/04/1991 <50 4.5 <0.5 <0.5 <0.5 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 <0.5 N.5 4.5 <0.5 NS 03n-911993 <50 <0.5 <0.5 <0.5 <0.5 NS 07/20/1993 <50 <0.5 <0.5 4.5 <0.5 <0.6 09/30/1993 <50 <0.5 <0.5 <0.5 <0.5 NS 01/1111994 <50 <0.5 <0.5 <0.5 <0.5 NS 04/14/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 07120/1994 <50 <0.5 <0.5 <0.5 <0.5 4.6 10/27/1994 <50 <0.5 <0.5 <0.5 <0.5 NS 03/0311995 <50 <0.3. <0.3 NS i 12/22t1997 <50 <0.3 <0.3 <0.3 <0.3 2:1 NS 04/1611998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 0712311998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 11/1111998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 03/1911999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/15/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 11/08/1999 NS NS NS NS NS NS 1 03/29/2000 NS NS NS NS NS NS 06/28/2000 NS NS NS NS NS NS MW-7SBB 102110119991 60 1 <03 1 <0.3 1 <0.3 <0.3 1 1:1 NS Gdolol l-0D_ko.xls Mgo 3 of 7 02/07/2001