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Table 4 Groundwater Monitoring Results-STEXITPH as Gasoline Analyses Del Monte Disco Property Stockton,California Concentration(ug/1) Sample TPH Ethyl Well Date Gasoline Benzene Toluene benzene Xylenes Dilution Lead TCLP 500 - - - 5,000 MCL 1 1,000 680 1,750 50 NP-1-80' 12/29/1994 NS 3112195 NS 07/26/1995 NS 04/17/1997 I:1000 NS ( 12/22/1997 1:500a/1:1000b NS 04/16/1998 1:1000 NS 08/07/1998 1:1000 NS 11/11/1998 I4oa/1:400b11:2000c NS 02/11/1999 1:200a/1:2000b NS 07/16/1999 1:200a/1:1000b NS 11/08/1999 1:40a/1:400b NS 03/29/2000 1:200a/L1000b NS NP-1-80 BB 12/22/1997 <50 <0.3 <0.3 <0.3 <0.31 NS NP-1-70' 03/12/1995 NS 07/26/1995 NS 08/15/1996 1:500 NS 04/17/1997 1:1000 NS 12/22/1997 1:1000a/1:100b NS 04/16/1998 1:1000 NS 08/07/1998 1:1000 NS i 11/11/1998 1:40a/1:2000b NS 02/11/1999 .1:200a/1:2000b NS 07/16/1999 1:200 NS 11108/1999 1:200 NS 03/29/2000 1:200a/I:500b NS NP-1-70 BB 12/22/1997 <50 <0.3 <0.3 <0.3 <0.3 NS NP-2-65' 8/15196 1:500 NS f 04/17/1997 1:100 NS j SVE-NORTH 04/17/1997 1:100 NS 12/22/1997 1:50a/l:100b NS l 04/16/1998 1:2 NS 07/23/1998 1:10 NS 11/11/1998 1:1 NS 02/11/1999 1:1a/1:100b NS 07/16/1999 1:1 NS 11/08/1999 1:1 NS 03/29/2000 1:1 NS SVE-N BB 12/22/1997 <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 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 11/08/1999 <50 <0.3 <0.3 <0.3 <0.3 1:1 1 NS 1 03/29/2000 <50 <0.3 <0.3 <0.3 <0.3 1:1 NS } SVE-SOUTH 04/17/1997 1:1000 NS 08/12/1998 NS 12/22/1997 NS 04/16/1998 1:500 NS 07/23/1998 1:200 NS 11/11/1998 1:400a/1:2000b NS 02/11/1999 1:2000 NS 07/1611999 1100 NS 11/08/1999 1:40a/I:200b NS 03/29/2900 1:200a/1:400b NS Gdata&00.:ds Page 6 of 7 07/05/2000