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Table 4 Groundwater Monitoring Results-BTEX/TPH as Gasoline Analyses Del Monte Disco Property Stockton,California I Concentration(u ) Sample TPH Ethyl Well Date Gasoline Benzene Toluene benzene Xylenes Dilution Lead TCLP - 500 - - - 5,000 MCL 1 1,060 680 1,750 50 NP-1-80' 12/29/1994 NS 3/12/95 NS 07/26/1995 NS 04/17/1997 1:1000 NS 12/22/1997 1:500a/1:1000b NS 04/16/1998 1:1000 NS 08/07/1998 1:1000 NS 11/11/1998 1:40a11:400b11:2000r 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/1:1000b NS 1 06/28/2000 NS NS NS NS NS NS NP-1-801313 12/22/1997 <50 <0.3 <0.3 <0.3 <0.3 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 1:1000x/1:100b NS 04/16/1998 1:1000 NS 08/07/1998 1:1000 NS 1 11/11/1998 1:40a/1:2000b NS 02/11/1999 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 NS NP-1-70 BB 12/22/1997 <50 <0.3 <0.3 <0.3 <0.3 NS NP-2-65' 8/15/96 1:500 NS 04/17/1997 1:100 NS SVE-NORTH 04/17/1997 1:100 NS 12/22/1997 1:50a/1100b NS 04/16/1998 1:2 NS 07/23/1998 1 1:10 NS 11/11/1998 L•1 NS 02/11/1999 ; b Lla/1:100b NS i 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 SVE-N BB 12/2211997 <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:I NS l 11/08/1999 <50 <0.3 x0.3 <0.3 <0.3 1:1 NS 03/29/2000 <50 <0.3 <0.3 1 <0.3 <0.3 1:1 NS SVE-SOUTH 04/17/19971:1000IR r34 i 0 1:1000 NS 08/12/1998 5 { NS 12122/1997 NS 04/16/1998 1:500 NS 07/23/1998 1:200 NS 11/11/1998 1:400a/1:2000b NS 02111/1999 1:2000 NS l 07/16/1999 1:200 NS 11/08/1999 .1 1:40a/1:200b NS 03/29/2900 1:200a/1:4Wb NS 06/28/2000 NS NS NS NS NS NS �, Gdc3fo6-W.x1s Page 6 of 7 11/07/2000