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Page 3 of 3 <br /> Table 3 <br /> Groundwater Monitoring Data and Analytical Results <br /> ARCO Service Stabon#595 <br /> 8100 N Highway 99 Stockton CA <br /> Well Depth Groundwater Groundwater Ethyl Xylenes MTBE MtBE <br /> Well Date Elevation to Weter Elevabon Elevation TPHg Benzene Toluene benzene (total) (EPA 6020) {EPA 8260) DO <br /> Number Sampled (ft MSL) (tt TOC) (ft MSL) Chan a ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) m L) <br /> WSW t 122000 -- — — — <50 0 <0 500 <0 500 <0 500 <0 500 <z 50 <2 D — <br /> 31512001 NP — » — — <50 0 <D 500 <0 500 <0 50D <D 500 <2 50 <2 00 — <br /> SIB12001 NP — — — — <50 0 <0 500 <0 500 <D 500 <0 500 -260 <2 00 2 13 <br /> 811/2001 NP -- -- — -50 <0 50 <0 50 <0 50 -050 <2 5 Q 0 — <br /> 1012312001 NP — .. <50 <0 50 -050 -050 <0 50 <2 5 <1 0 225 <br /> 21112002 NP — — — — <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 — <br /> 411112002 NP — — — — <50 <0 50 -050 <0 50 -050 <2 5 -050 — <br /> 7116t2D02 NP — — — — <50 40 50 <0 50 <0 50 <0 50 <2 5 40 50 — <br /> 102/2002 NP » -- — -60 -050 <0 50 <0 50 <0 50 <0 50 <br /> 11172003 NP — — — <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 — <br /> 41312003 NP — — — — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — <br /> 722/2003 NP — — — — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — <br /> 1002003 NP — — — — <50(b) <0 50(b) <0 50(b) <0 50(b) <0 50(b) — <0 50(b) — <br /> 11912004 NP — — — -60 <0 50 <0 50 <0 50 <0 50 — <D 50 — <br /> OCTB 1002003 — — — — — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — <br /> 10l212003 — — — — <50 <0 50 <0 50 <0 5D -050 — <0 50 — <br /> 11912004 — — — — — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — <br /> CB 2 64 711912001 — -- -- -- <50 <0 50 <0 50 <0 50 <0 50 54 — <br /> Notes <br /> TPHg=Total petroleum hydrocarbons as gasoline <br /> MtBE=Methyl tart butyl ether <br /> DO=Dissolved oxygen <br /> EPA 8020=analyzed using EPA Method 8020 —=not measured or analyzed <br /> EPA 8260=analyzed using EPA Method 826D <=below given laboratory detection lima <br /> it=feel PlNP=purged/not purged <br /> MSL=mean sea level mg1L-milligrams per Ider <br /> TOC=top of casing ppb=parts per billion <br /> =Hydrocarbon pattern is present in the requested fuel quantitation range but TB 1=Trip Blank <br /> (a)=Chromatogram Pattern Gasoline C5 C10 WSW=Water supply well <br /> (b)=This sample was analyzed beyond the EPA recommended holding time The results may still be useful for their intended purpose <br /> (c}=Discrete peak®C8 C7 <br /> (d)=Laboratory reports sample with a possible high bias due to the continuing calibration verification failing outside acceptance cnteria <br /> (e)=This sample was originally analyzed with a positive result however the reanalysis did not confirm the presence of the analyte <br /> (f)=The sample aliquot was taken from a VOA vial with headspace(air bubble greater than 6 mm diameter)which may have resulted in the loss of volatile analysis <br /> I tARC0105951Tables=IVINTable 3 Groundwater Momtormg Data and Analytical Results As 4/16/2004 <br />