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T. 01 Table 1 Groundwater Elevation and Analytical Data ; Former ARCO Service Station No 2168 441 W Charter Way, Stockton CA Top of Depth to Water Level Ethyl- Total Well Date P! Casing Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP Elevation (feet bgs) (feet ms]) (pg/L) (pg/L) (pg1L) (pg1L) (U91) (pg1L) (pglL) (mg1L) Comments MW-8C 02112/2003 P 901 2477 -1576 <50 -- <0 50 <0 50 UJ <0 50 <0 50 078 .175 05/29/2003 P 901 2167 -1266 <50 -- <0 50 <0 50 <0 50 <0 50 085 514 08/04/2003 P 901 2215 -13 14 <50 — <0 50 <0 50 <0 50 <0 50 079 247 11/03/2003 P 901 2338 -1437 <50 -- <0 50 <0 50 <0 50 <0 50 069 099 02109/2004 P 901 2314 4413 <50 -- <0 5o <0 50 <0 50 <0 50 0 68 1 3 TPHg=Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics in analytical report) TPHd=Total petroleum hydrocarbons as diesel(reported as DRO-diesel range organics in the analytical report) MtBE=Methyl tert-butyl ether DO=Dissolved oxygen bgs=below ground surface msl=mean sea level pg/L=micrograms per liter mg/L=milligrams per liter P/NP=purged/not purged <=below given laboratory detection limits --=not measured or analyzed NA =Not analyzed NS=Not sampled NE=Not evaluated (47)=Discrete sample depth in feet bgs `=Raised method reporting limit due to high analyte concentration requiring sample dilution *"=Raised method reporting limit due to matrix interference MTBE was analyzed using USEPA Method 8260,unless noted otherwise(see below) [i]=MTBE was analyzed using USEPA Method 8020 [2]=Water levels collected on 1115199,samples collected on 12/17/99 due to equipment failure [3]=Water level collected on 2/25100 [4]=Chromatogram Pattern Gasoline C6-C12 [5]=Chromatogram Pattern Weathered Gasoline C6-C12 [6]=Chromatogram Pattern Weathered Gasoline C6-C12+Unidentified Hydrocarbons C6-C12 [7]=Chromatogram Pattern Unidentified Hydrocarbons C6-C12 [8]=Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel [9]=Sample was re-analyzed outside of USEPA recommended hold time at a dilution [10]=The sample was diluted due to the presence of high levels of non-target analytes resulting in below elevated reporting limits [11]=The reported compound(s)have been confirmed by a second(dissimilar)column or detector Numbers in comments column indicate discrete depth samples in feet bgs Beginning 6/13102,analytical data validation is provided in the text Data Qualifier Definitions U=The analyte was analyzed for,but was not detected above the sample reporting limit J=The analyte was positively identified,the associated numerical value is the approximate concentration of the analyte in the sample N=The analysis indicates the presence of an analyte for which there is presumptive evidence to make a tentative identification NJ=The analysis indicates the presence of an analyte that has been tentatively identified and the associated numerical value represents its approximate concentration UJ=The analyte was not detected above the reported sample reporting lima However,the reported reporting limit is approximate and mayor may not represent the actual limit of quantitation Page 11 of 12 Report Date April 21,2004 '