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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2130 <br /> 7906 N EL Dorado Street, Stockton, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE 00 <br /> Number Sampled NP (feetms]) (feet bgs) (feet msl) (pglL) (pglL) (pglL) (pg1L) (pglL) (pg1L) WIL) (mg1L) Comments <br /> VW-12 9/2/1999 — 3993 -- NA — NA NA NA NA NA — <br /> 1112911999 — -- 3809 - NA - NA NA NA NA NA - <br /> 3l1612000 — - 3423 — NA - NA NA NA NA NA - <br /> 6/26/2000 — 3668 - NA — NA NA NA NA NA <br /> 9/28/2000 -- - 4094 -- NA — NA NA NA NA NA -- <br /> 12/19/2002 — 4050 -- <200 - 120 <0 50 <0 50 <0 50 2 6[2] -- <br /> 03/06/2003 P -- 3827 -- 440 R -- <0 50 <0 50 <0 50 <0 50 0 98[2] — <br /> 06/11/2003 P — 3761 -- <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] — <br /> 09/24/2003 P - 4171 -- <50 — <0 50 <0 50 <0 50 <0 50 <0 50[2] -- <br /> 12/10/2003 P — 41 31 -- 210 — <2 5 <2 5 <2 5 <2 5 9 5[2] -- <br /> 03l08l2004 P -- 38 34 -- <50 -- <o 50 <0 50 <0 50 <0 50 <0 50[2] 201 <br /> TPHg=Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics in analytical report) <br /> TPHd=Total petroleum hydrocarbons as diesel(reported as DRO-diesel range organics in the analytical report) <br /> DO=dissolved oxygen <br /> pg/L=Analytical results in micrograms per liter <br /> mg1L=milligrams per liter <br /> PINP=purged/not purged <br /> MtBE"=methyl tert-butyl ether <br /> MtBE was analyzed using USEPA Method 8020 <br /> TOC=Top of Casing <br /> msl=mean sea level <br /> bgs=below ground surface <br /> <=Below detection limit for the analytic methods used <br /> --=not measured or analyzed <br /> *=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution <br /> **=Raised MRL due to matrix interference <br /> ***=The sample contains discrete non-fuel components eluting in the gasoline range quantified as gasoline <br /> The chromatogram does not match the typical gasoline fingerprint <br /> [1)=Not sampled,as well is scheduled to be abandoned <br /> (2]MtBE was analyzed using USEPA Method 82606 <br /> [3)Chromatogram Pattern Weathered Gasoline C6-C12 <br /> [4]Benzene,toluene ethylbenzene and total xylenes were analyzed using USEPA Method 8260B <br /> [5]Chromatogram Pattern Unidentified Hydrocarbons C6-C12 <br /> [6)Hydrocarbon pattern is present in the requested quantitation range but does not resemble the pattern of the requested fuel <br /> NA=Not analyzed <br /> FP=Free Product <br /> S=Sheen <br /> Data Qualifier Definitions <br /> Page 18 of 19 <br /> Report Date May 12,2004 <br />