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Table 4 { Groundwater Monitoring Results-Oxygenate Analyses Del Monte Disco Property Stockton,California Concentration u ) tert- Di-isopropyl Ethyl-tert- tert-Amyl Well Sample Date MTBE Dilution Butanol ether butyl ether Methyl ether MW-DIS-9 12119196* <0.5 1:1 4117197 <5 2:1 8112197 <5 1:1 NA <1.0 <1.0 <1.0 4116/98 <10 1:1 NA <5 <5 <5 5/20198 NA NA <20 NA NA NA 7/23/98 <5 1:1 <20 <5 <5 <5 MW-DIS-10 12119/96* <0.5 1:1 4/17197 <5 1:1 8112/97 <5 1:1 NA <1.0 <1.0 <1.0 4/16/98 <10 1:1 -NA <5 <5 <5 5/20/98 NA NA <20 NA NA NA 7122/98 <5 1:1- <20 <5 <5 <5 NP-1-90' 4/17/97 206** 1:500 6112/97 <5 1:1 <20 <5 <5 <5 4/17198 <40 1:4 NA <20 <20 <20 5/21/98 NA NA <20 NA NA NA 817198 <20 1:1 <20 <5 <5 <5 NP-1-80' 4117197 304** 1:1000 6/12/97 <5 1.1 <20 <5 <5 <5 4/17198 <40 1.4 NA <20 <20 <20 \ 5/21/98 NA NA <20 NA NA NA 817198 <20 1:1 <20 <5 <5 <5 NP-1-70' 4117197 211** 1:1000 6/12/97 <5 1:1 <20 <5 <5 <5 4117198 <20 1:2 NA <10 <10 <10 5/21198 NA NA <20 NA NA NA 817198 <20 1:1 <20 <5 <5 <5 NP-2-65' 4117197 <10 1:10 NA NA NA NA 6112197 <5 1:1 NA NA NA NA SVE-3 4117197 <5 1:1 NA NA NA NA SVE-4 4/17197 224** 1:100 NA NA NA NA 6/12197 <5 1:1 NA NA NA NA _., SVE-N 4/17198 <10 1:1 NA <5 <5 <5 5/21/98 NA NA <20 NA NA NA 7123198 <20 1:1 <20 <5 <5 <5 SVE-S 8112197 <100 1:20 NA <100 <100 <100 4/17/98 <40 1:4 NA <20 <20 <20 5/21198 NA NA 140 NA NA NA 7123/98 <20 1 1:1 1 <20 1 <5 <5 <5 Notes; 0.5: Below Detection limit of 0.5 ug/l *: Sample collected by minimumaeration technique **: Not Confirmed 6112197: Samples collected on 6112/97 were analyzed using EPA Method 8240. ( MTBE analysis by EPA 8015 unless otherwise specified. Gdata9-98.xls Page 2 of 2 9/30/98