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i� 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) (gg/L) (gg/L) (Ag/L) (µg/L) (4g/L) (µg/L) (µg/L) (pg/L) (4g/L) S-1 3/30199 14 16,000 N/A N/A N/A N/A 1,200 <10 240 1,200 6/28199 15 15,000 NIA NIA 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 5/17/00 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 NIA <50' 42 <25' 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 <2.52 <2.52 <2.52 <1.32 <1.32 <1.32 2.9 8/8101 0.38 760 1,300 <1.0 <1.0 <L0 <0.5 <0.5 <0.5 4.6 10/27/01 <0.502 170 89 <5.02 <5.02 <5.02 <2.52 <2.52 <2.52 <2.52 2/18/02 <0.102 4.8 <101 <1.0 <1.0 <1.0 1.3 0.52 <0.50 0.80 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 5/17100 3.1 2,800 400 N/A N/A 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 <5.0' <5.O1 30 12 140 5.4 730 10/27/01 0.074 12 7.6 <1.0 <1.0 <1.0 <0.50 <0.50 <0.50 <0.50 2/18/02 0.084 2.6 46 <1.0 <1r0 <1.0 <0.50 <0.50 <0.50 2.8 Explanation: TPHG analyzed by USEPA Method 8015 DIPE=Di-isopropyl ether BTEX and oxygenates analyzed by USEPA Method 8260B ETRE=Ethyl tertiary butyl ether TPHG=Total petroleum hydrocarbons as gasoline MTBE=Methyl tertiary butyl ether TBA=Tertiary butyl alcohol N/A=Not analyzed TAME=Tertiary amyl methyl ether =Reporting limits were increased due to high concentrations of target analytes `=Reporting limits were increased due to sample foaming USA_65_Quanerly_Data.xls Page 4 of STRATUS