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Table 4 Groundwater Monitoring Results-BTEX/TPH as Gasoline Analyses iIr Del Monte Disco Property Stockton,California Concentration(u ) . Sample TPH Ethyl well Date Gasoline Benzene Toluene benzene X lenes Dilution Lead TCLP - 500 - - 51000 MCL 1 I,OOD 680 1.750 50 NP-1-60' 12/29/1994 NS 3112195 NS 07/26/1995 NS 04/1711997 1:1000 NS 12!22/1997 1:500a/1:1000b NS 04/16/1998 1:1000 NS 08/07/1998 I:1000 NS 11/11/1998 1:40a/1:40Db11:2000c NS 02/11/1999 1:200all:2000b NS 07/16/1999 1:200a/1:1000b NS 11/08/1999 1:40a/1:400b NS 03/29/2000 1:200alI:1000b NS 06/28/2000 NS NS NS NS NS NS 11/16/2000 1:200 NS NP-1-80 BB 32!2211997 C50 <0.3 <0.3 <0.3 <03 NS NP-1-70' 03117J1995 NS 07/26/1995 NS 08/15/1996 1:500 NS 04/17/1997 1:1000 NS 12221997 1:1000a/I:I OOb NS 04/16/1998 1:1000 NS 08/07/1998 1:1000 NS 11/11/1998 1:40a/I:20Wb NS 0211/1999 1:200a/1:2000b NS 07/16/1999 1:200 NS 11/08/1999 1:200 NS 03/29/2000 1:200a/1:500b NS 06/28/2000 NS NS NS NS. NS N5 11/16!2000 1:100 NS NP-1-70 BB 12/22119917 c50 <0.3 <0.3 <0.3 <0.3 NS NP-2-65' 6115196 1:500 NS 04/17/1997 1:100 NS i SVE-NORTH 04/17/1997 1:100 NS 12122/1997 1:50a/1:100b NS 04/16/1998 1:2 NS 07/2311998 1:10 NS 11/11/3998 1:1 NS 02/11/1999 I:la/3:]OOb NS 07/16/1999 1:1 NS 11/08/1999 1:1 NS 03/29/2000 1:1 NS 06/28/2000 NS NS NS NS NS NS 11/16/2000 l:1 NS SVE-N BB 1 212211 9 97 <50a <0.3a <0.3b <0.3a <0.3a 1:500a/1;1000b NS 04/16/1998 <50 <0.3 <0.3 <0.3 <0.3 2:1 NS 1 02111/1999 <50 <0.3 <0.3 <03 <0.3 1:1 NS 07/16/1999 <50 <0.3 <0.3 <03 <0.3 1:1 NS 11/08/1999 <50. <0.3 <0-3 <03 <0.3 1:1 NS 03/29/2000 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS I Gdola1 f-oo_ko x15 Page 6 of 7 02107/2001