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. TABLE 2 HISTORICAL GROUNDWATER ANALYTICAL SUMMARY USA Gasoline Station 65 2500 West Lodi Avenue Lodi, California Ethyl- Total Sample Date TPH-G MTBE TBA DIPE ETBE TAME Benzene Toluene benzene Xylenes ID Collected (mg/L) (µg/L) (pg/L) (pg/L) (l1P/L) (4g/ ) (µg/L) (lag/-) (µg/L) (µg/L) S-1 3/30/99 14 16,000 N/A N/A N/A N/A 1,200 <10 240 1,200 6/28/99 15 15,000 N/A N/A N/A N/A 12,00 <0.5 270 1,200 12/19/99 7.6 10,000 1,300 N/A N/A <500 440 27 130 440 5117/00 6.1 6,500 5,000 N/A N/A 18 500 <4.0 91 140 9/22/00 7.7 8,100 5,500 N/A N/A 22 490 210 99 357 12/6/00 12 10,000 8,000 N/A N/A <50t 42 <25t 26 237 2/23/01 2.3 2,300 2,900 <5.0 <5.0 <5.0 <2.0 <0.5 3.2 154 5/22/01 0.85 780 840 <2.5Z <2.5z <2.52 <1.3Z <1.32 <1.32 2.9 818/01 0.38 760 1,300 <1.0 <1.0 <1.0 <0.5 <0.5 <0.5 4.6 S-2 3/30/99 2.3 2,900 N/A N/A N/A N/A 120 5.5 88 270 6/28/99 8.9 10,000 N/A N/A NIA N/A 510 65 96 1,300 12/19/99 1.9 1,300 <50 N/A N/A <50 48 44 40 76 5/17/00 3.1 2,800 400 N/A NIA 47 240 7.6 160 408 9/22/00 7.4 2,600 340 N/A N/A 45 130 270 270 1,300 12/6/00 2.0 1,100 190 N/A N/A 24 38 8.6 57 150 2/23/01 <0.05 88 <10 <1,0 <1.0 <1.0 <0.5 <0.5 <0.5 <0.5 5/22/01 0.062 47 20 <1.0 <1.0 <1.0 <0.5 <0.5 1.3 3.3 8/8/01 6.2 2,600 1,700 <5.0t <5.0' 30 12 140 5.4 730 TPHG analyzed by USEPA Method 8015 BTEX analyzed by USEPA Method 8260B DIPE=Di-isopropyl ether ETBE=Ethyl tertiary butyl ether MTBE=Methyl tertiary butyl ether TBA=Tertiary butyl alcohol TAME=Tertiary amyl methyl ether DIPE,ETBE,MTBE,TBA and TAME analyzed by USEPA Method 8260B TPHG=Total petroleum hydrocarbons as gasoline are analyzed as total petroleum hydrocarbons purgeable N/A=Not analyzed t=Reporting limits were increased due to high concentrations of target analytes 2=Reporting limits were increased due to sample foaming USA_65_Quarterly Data.xls Page 4 of 5rRATUS