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Table 4 <br /> Groundwater Monitoring Results-Oxygenate Analyses <br /> Del Monte Disco Property <br /> Stockton,California <br /> i <br /> Concentration u <br /> r tert- Di-isopropyl Ethyl-tert- tert-Amyl <br /> f Well Sample Date MTBE Dilution Butanol ether butyl ether Methyl ether <br /> SVE-NORTH 4117198 <10 1:1 NA <5 <5 <5 <br /> 5121198 NA NA <20 NA NA NA <br /> If 7/23198 <20 1:1 <20 <5 <5 <5 <br /> I 11/11/98 <5 1:1 <50 <5 <5 <5 <br /> SVE-SOUTH 8112/97 <100 1:20 NA <100 <100 <100 <br /> E 4117198 <40 1:4 NA <20 <20 <20 <br /> 5/21/98 NA NA 140 , NA NA NA <br /> 7123198 <20 1:1 <20 <5 <5 <5 <br /> 11/11/98 <20 1:4 <200 <20 <20 <20 <br /> Notes: <br /> <0.5: Below Detection limit of 0.5 ug/1 <br /> Sample collected by minimum aeration technique <br /> **: Not Confirmed <br /> 6112197: Samples collected on 6112197 were analyzed <br /> using EPA Method 8240. <br /> MTBE analysis by EPA 8015 unless otherwise specified. <br /> 1 <br /> j, <br /> E : <br /> Gdat09-98.XIs Page 3 of 3 1/22/99 <br />