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Table 4 Groundwater Monitoring Results-BTEX/TPH as Gasoline Analyses Del Monte Disco Property Stockton,California Concentration(uo) Sample TPH Ethyl W411 hate - Gasoline Benzene Toluene benzene Xylenes Dilution Lead TCLP - 500 - - 5,000 MCL - 1 1,000 680 1,750 50 MW-DIS-7D 09/23/1991 <250 <0.8 06/30/1992 10/01/1992 <50 <0.5 <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 07/20/1993 <50 <0.5 <0.5 <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 04/1411994 <50 LIM <0.5 <0.5 NS ' 07/20/1994 <50 <0.5 <0.5 <0.5 <0.5 <0.6 10127/I994 <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 2:1 NS 04/16/1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/23/1999 <50 <0.3 <0.3 <0.3 <03 I:1 NS 11/1111998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 03/19/1999 <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 11/06/1999 NS NS NS NS NS NS 03/29/2000 NS NS NS NS NS NS 06/28/2000 NS NS NS NS NS NS ' MW-7DBB 02/10/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS MW-DIS-BS 03/03/1995 <50 <0.3 <0.3 <0.3 <0.3 NS 06/19/1995 <50 <0.3 <0.3 <0.3 <0.3 NS 10/18/1995 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 02/13/1996 <50 <03 <0.3 <0.3 <0.3 1:1 NS 06/06/1996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS r 08/15/1996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS it 12/20196* M§= <0.5 <0.5 <0.5 no= 1:1 NS 12/20/1996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 041171199"1 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 08/12/1997 ND ND ND ND ND 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 02111/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/16/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 1[108/1999 NS NS NS NS NS NS 03/29/2000 NS NS NS NS NS NS 06/28/2000 NS NS NS NS NS NS MW-DIS-8D 03/03/1995 <50 a '.. <0.3 <0.3 NS 06/19/1995 <50 <0.3 Am= NS i 10/18/1995 <50 <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 06/06/1996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 08/15/1996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 12/19/96* <15 <0.5 <0.5 <0.5 <0.5 1:1 NS 12/19/1996 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 12/22/1997 <50 <0.3 <0.3 <0.3 <03 1:1 NS 04/16/1998 <50 <0.3 <0.3 <0.3 50.3 1:1 NS 07/22/1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS I1/11/1998 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 02/11/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 07/16/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS 11/0811999 NS NS NS NS NS NS 03/29/2000 NS NS NS NS NS NS 06/28/2000 NS NS NS NS NS NS VGdaia6-00.)ds Page 4 of 7 11/07/2000