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Table 4 Groundwater Monitoring Results-Oxygenate Analyses Del Monte Disco Property Stockton,California I i Concentration(ug/1) Di-isopropyl Ethyl-tert- tert-Amyl Well Sample Date E Dilution tert-Butanol ether butyl ether Methyl ether NP-1-80' 4117/97 .304 .* 1:1000 NA NA NA NA 6112197 <5 1:1 <20 <5 <5 <5 12/23/97 <25 1:5 <100 <25 <25 <25 4117198 <40 1:4 NA <20 <20 <20 5/21198 NA NA <20 NA NA NA 817/98 <20 1:1 <20 <5 <5 <5 11/11/98 <20 1:4 <200 <20 <20 <20 2/11199 0 <50 <5 <5 <5 NP-1-70' 4/17/97 211* 1:1000 NA NA . NA NA 6/12/97 1:1 <20 <5 <5 <5 12/23/97 <5.0 1:1 (0 <5 <5 <5 4/17/98 <20 1:2 NA <10 <10 <10 5/21/98 NA NA <20 NA NA NA 8/7/98 <20 1:1 <20 <5 <5 <5 11/11/98 <20 1:4 <200 <20 <20 <20 2111/99 <5 0 <50 <5 <5 <5 NP-2-65' 4/17/97 <10 1:10 NA NA NA NA 6112/97 <5 1:1 NA NA NA NA SVE-3 4/17/97 1:1 NA NA NA NA i SVE-4 4117197 24* 1:100 NA NA NA NA 6/12/97 1:1 Uk NA NA NA SVE-NORTH 12/23/97 <5 1:1 1 <5 <5 <5 4/17/98 <10 1:1 NA <5 <5 <5 5/21/98 NA NA <20 NA NA NA 7/23/98 <20 1:1 <20 <5 <5 <5 11/11/98 <5 1:1 <50 <5 <5 <5 2111199 <5 1:1 <50 <5 <5 <5 j SVE-SOUTH 8112/97 <100 1:20 NA <100 <100 <100 4/17/98 <40 1:4 NA <20 <20 <20 5/21/98 NA NA NA NA NA I 7/23/98 <20 1:1 <20 <5 <5 <5 11/11/98 <20 1:4 <200 <20 <20 <20 2111/99 <5 1:1 <50 <5 <5 <5 � Notes: <0.5: Below Detection limit of 0.5 ug/l *: Sample collected by minimum aeration technique **: Not Confirmed by GUMS I Samples collected on 6/12/97 were analyzed using EPA Method 8240. 3/19/99 MW-DIS-2 re-sampled on this date.Detection not confirmed by GC/MS.MTBE was not detected in the original 2/11/99 sample(analyzed by EPA Method 8015/8020 and confirmed by GUMS Method 8260) I Del Monte Gda%2.99.xls Page 3 of 3 6116199