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Table 5 <br /> Groundwater Monitoring Results-Oxygenate Analyses <br /> Del Monte Disco Property <br /> ( . Stockton,California <br /> I <br /> Concentration(ug/1) <br /> Sample EPA Di-isopropyl Ethyl-tert-butyl tert-Amy)Methyl <br /> Well Date Method MTBE Dilution ter/-Butanol ether ether ether <br /> NP-1-80' 04!1711997 90158020 BMW ,1:1000 NA NA NA NA <br /> 6/12/97 8240 <5 1:1 <20 <5 <5 <5 <br /> 12/23/1997 8260M <25 1:5 <100 <25 <25 <25 <br /> 04/17/1998 8260M <40 1:4 NA <20 <20 <20 <br /> 05/21/1998 8260M NA NA <20 NA NA NA <br /> 08/07/I999 8260M <20 1:1 <20 <5 <5 <5 <br /> 11/11/1998 8260M <20 1:4 <200 <20 <20 <20 <br /> 02/11/1999 8260M <5 0 <50 <5 <5 <5 <br /> 07/16/1999 8260M <5 1:1 <50 <5 <5 <5 <br /> 11/08/1999 9260M <5 1:1 <50 <5 <5 <5 <br /> NP-1-70' 04/17/1997 son=20 M 1:1000 NA NA NA NA <br /> 6112/97 8240 <5 1:1 <20 <5 <5 <5 <br /> . 12/23/1997 8260M <5.0 1:1 ISBN= <5 <5 <5 <br /> 04/17/1998 8260M <20 1:2 NA <10 <10 <10 <br /> 05/21/1998 8260M NA NA <20 NA NA NA <br /> 08/07/1998 8260M <20 1:1 <20 <5 <5 <5 <br /> 11/11/1998 8260M <20 1:4 <200 <20 <20 <20 <br /> 02/11/1999 8260M <5 0 <50 <5 <5 <5 <br /> 07/16/1999 8260M <5 1:1 <50 <5 <5 <5 <br /> 11/08/1999 8260M <5 1 1:1 <50 <5 <5 <5 <br /> NP-2-65' 04/17/1997 80158020 <10 1:10 NA NA NA NA <br /> 6112197 8240 <5 1:1 NA NA NA NA <br /> SVE-NORTH 04/17/1997 8015raow <5 1:1 NA NA NA NA <br /> i <br /> 12/2311997 8260M <5 1:1 <5 <5 <5 <br /> j 04/17/1998 8260M <10 1:1 NA <5 <5 <5 <br /> 05/21/1998 8260M NA NA <20 NA NA NA <br /> 07/23/1998 8260M <20 1:1 <20 <5 <5 <5 <br /> 11/11/1998 8260M <5 1:1 <50 <5 <5 <5 <br /> 02/11/1999 8260M <5 1:1 <50 <5 <5 <5 <br /> 07/16/1999 8260M <5 1:1 <50 <5 <5 <5 <br /> 11/08/1999 8260M <5 1:1 <50 <5 <5 <5 <br /> SVE-SOUTH 04/17/1997 90 15M20 AUJRN 1:100 NA NA NA NA <br /> 6/12197 8240 <5 1:1 NA NA NA NA <br /> 08/12/1997 8260M <100 1:20 NA <100 <100 <100 <br /> 04117/1998 8260M <40 1:4 N A <20 <20. <20 <br /> 05/21/1998 8260M NA NA NA NA NA <br /> 07/23/1998 8260M <20 1:1 <20 <5 <5 <5 <br /> 11/11/1998 8260M <20 1:4 <200 <20 <20 <20 <br /> 02/11/1999 8260M <5 1:1 <50 <5 <5 <5 <br /> 07116/1999 8260M <5 1:10 <50 <5 <5 <5 <br /> I 1108/1999 8260M <5 1:20 <50 <5 <5 <5 <br /> Notes: <br /> <0.5: Below Detection limit of 0.5 ug/1 <br /> *: Sample collected by minimum aeration technique <br /> **: Not Confirmed by GC/MS <br /> Samples collected on 6/12197 were analyzed using EPA Method 8240. <br /> '3/19199 MW-DIS-2 re-sampled on this date and analyzed by EPA Method 8015/8020.Detection not confirmed by GCIMS. <br /> MTBE was not detected in the original 2111/99 sample(analyzed by EPA Method 8015/8020 and confirmed by <br /> GUMS Method 8260) <br /> Gdotal-00.xls Page 3 of 3 <br /> 9 01/2012000 <br /> I _ <br />