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i <br /> Table 5 <br /> Groundwater Monitoring Results-Oxygenate Analyses <br /> ( Del Monte Disco Property <br /> Stockton,California <br /> Concentration(u ) <br /> Sample EPA Di-isopropyl Ethyl-tent-butyl tert-Amyl Methy <br /> Well Date Method MTBE Dilution tert-Butanol ether ether ether <br /> I <br /> NP-1-80' 4117/97 8015/8020 ;_ 1:1000 NA NA NA NA <br /> 6/12197 8240 <5 1:1 CLO <5 <5 <5 <br /> 12/23/97 8260M <25 1:5 <100 <25 <25 <25 <br /> 4/17/98 8260M <40 t:4 NA <20 CLO <20 <br /> 5121198 8260M NA NA <20 NA NA NA <br /> 8/7198 8260M <20 1:1 <20 <5 <5 <5 <br /> 11/11/98 8260M <20 1:4 <200 <20 <20 <20 <br /> 2/11199 8260M <5 0 <50 <5 <5 <5 <br /> 7116199 8260M <5 1:1 <50 <5 <5 <5 <br /> NP-1-70' 4117/97 9015/8020 3;2 *. s 1:1000 NA NA NA NA <br /> I 6112/97 8240 <5 1:1 <20 <5 <5 <5 <br /> 12/23/97 8260M <5.0 1:1 a !'J"6T <5 <5 <S <br /> 4117198 8260M <20 1:2 NA <10 <10 <10 <br /> 5121/98 8260M NA NA <20 NA NA NA <br /> 817198 8260M <20 1:1 <20 <5 <5 <5 <br /> 11/11/98 8260M <20 1:4 <200 <20 <20 CLO <br /> 2/11199 8260M <5 0 <50 <5 <5 <5 <br /> 7116199 8260M <5 1 1:1 1 <50 <5 <5 <5 <br /> NP-2-65' 4/17/97 8015/8020 <10 1:10 NA NA NA NA <br /> 6112197 8240 <5 t:I NA NA NA NA <br /> SVE-NORTH 4/17/97 8015/8020 <5 1:1 NA NA NA NA <br /> ` .:k <br /> � 12/23/97 8260M <5 l:l �� a,� <5 <5 <5 <br /> 4/17198 8260M <10 1:1 NA <5 <5 <5 <br /> 5/21198 8260M NA NA <20 NA NA NA <br /> 7/23198 8260M <20 1:1 <20 <5 <5 <5 <br /> r 11/11/98 8260M <5 1:1 <50 <5 <5 <5 <br /> 2111/99 8260M <5 1:1 <50 <5 <5 <5 <br /> 7116199 8260M <5 1:1 1 <50 <5 <5 <5 <br /> SVE-SOUTH 4117/97 801518020 32aA 1:100 NA NA NA NA <br /> 6/12/97 8240 <5 t:I NA NA NA NA <br /> 8112197 8260M <100 1:20 NA <100 <100 <100 <br /> 4117/98 8260M <40 1:4 NA <20 <20 <20 <br /> i 5121/98 8260M NA NA NA NA NA NA <br /> t 7/23198 8260M <20 1:1 <20 <5 <5 <5 <br /> 11/11/98 8260M <20 1:4 <200 <20 <20 <20 <br /> 1 <br /> 2111/99 8260M <5 1:1 <50 <5 <5 <5 <br /> 7/16199 1 8260M <5 1:10 <50 <5 <5 <5 <br /> ]Votes: <br /> <0.5: Below Detection limit of 0.5 ug/l <br /> 1 *: 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 801518020.Detection not confirmed by GC/MS. <br /> MTBE was not detected in the original 2/11/99 sample(analyzed by EPA Method 8015/8020 and confirmed by <br /> GC/MS Method 8260) <br /> Gdata8-99.xls Page 3 of 3 912/99 <br />