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f <br /> r <br /> j Table 4 <br /> Groundwater Monitoring Results-Oxygenate Analyses <br /> Del Monte Disco Property <br /> Stockton,California <br /> Concentration(ug/1) <br /> tert- Di-isopropyl Ethyl-tert- tert-Amyl <br /> Well Sam le Date MTBE Dilution Butanol ether butyl ether Methyl ether <br /> SVE-NORTH 4117/98 <10 1:1 NA <5 <5 <5 <br /> 5121198 NA NA <20 NA NA NA <br /> 7123198 <20 1:1 <20 <5 <5 <5 <br /> I <br /> 11/11/98 <5 1:1 <50 <5 <5 <5 <br /> SVE-SOUTH 8112197 <100 1:20 NA <100 <100 <100 <br /> 4117198 <40 1:4 NA <20 X20 <20 <br /> 5121198 NA NA 140 NA NA NA <br /> 7123198 <20 1:1 <20 <5 <5 <5 <br /> 11/1I/98 <20 1:4 <200 <20 <20 <20 <br /> Notes: <br /> <0.5: Below Detection limit of 0.5 ug/l <br /> *; Sample collected by.minimum aeration technique <br /> ** Not Confirmed <br /> j 6112197: Samples collected on 6112197 were analyzed <br /> using EPA Method 8240. <br /> MTBE analysis by EPA 8015 unless otherwise specified. <br /> I <br /> r <br /> l - <br /> ti <br /> 1 <br /> y <br /> Gdat09 98.x15 Page 3 of 3 1122199 <br /> i <br />