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Table 5 Groundwater Monitoring Results-Oxygenate Analyses Del Monte Disco Property Stockton,California Concentration(W) Sample EPA Di-isopropyl Ethyl-tent-butyl tert-Amyl Mehhy well Date Method MTBE Dilution tert-Butanol ether ether ether NP-1-80' 4/17197 8015/8020 1:1000 NA NA NA NA 6112197 8240 <5 1:1 <20 <5 <5 <5 12/23/97 8260M <25 1:5 <100 Gly <25 <25 I 4117198 8260M <40 1:4 NA <20 <20 <20 5/21/98 8260M NA NA <20 NA NA NA 8/7/98 8260M <20 1:1 <20 <5 <5 <5 11/11/98 8260M <20 1:4 <200 <20 <20 <20 2111/99 8260M <5 0 <50 1 <5 <5 <5 NP-1-70' 4117197 80158020 I'll-%' 1:1000 NA NA NA NA 6/12/97 8240 <5 1:1 <20 <5 <5 <5 12/23/97 8260M <5.0 1:1 $ <5 <5 <5 4/17/98 8260M <20 1:2 NA <10 <10 <10 5/21198 8260M NA NA <20 NA NA NA 817/98 8260M <20 1:1 <20 <5 <5 <5 11/11/98 8260M <20 IA <200 <20 <20 <20 2/11199 8260M <5 0 <50 <5 1 <5 <5 NP-2-65' 4117/97 8015/8020 <10 1:10 NA NA NA NA 6/12197 8240 <5 I:1 NA NA NA NA SVE-NORTH 4117197 8015/8020 <5 1:1 NA NA NA NA 12/23/97 8260M <5 1:1 MEIN= <5 <5 <5 4/17198 1 8260M <10 1:1 NA <5 <5 <5 5/21/98 8260M NA NA <20 NA NA NA I, 7/23/98 8260M <20 1:1 <20 <5 <5 <5 11111198 8260M <5 1:1 <50 <5 <5 <5 2/11/99 8260M <5 1:1 <50 <5 <5 <5 I SVE-SOUTH 4/17197 8015/8020 ,. '"' 1:100 NA NA NA NA 6112/97 8240 <5 1:1 NA NA NA NA 8/12/97 8260M <100 1:20 NA <100 <100 <100 4/17/98 8260M <40 1:4 NA <20 <20 <20 5/21/98 8260M NA NA 'M' NA NA NA 7123198 8260M <20 1:1 <20 <5 <5 <5 11/11/98 8260M <20 1:4 <200 <20 <20 <20 2/11/92__L 8260M <5 1 1:1 11 <50 <5 1 <5 1 <5 Notes: <0.5: Below Detection limit of 0.5 ug/1 *: Sample collected by minimum aeration technique **: Not Confirmed by GC/MS Samples collected on 6/12/97 were analyzed using EPA Method 8240. '3/19/99 MW-DIS-2 re-sampled on this date and analyzed by EPA Method 8015/8020.Detection not confirmed by GC/MS. MTBE was not detected in the original 2111199 sample(analyzed by EPA Method 8015/8020 and confirmed by GOMS Method 8260 Gdato2-99.x1s Page 3 of 3 B/10/49