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i TABLE 1 GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY ARCO Service Station No. 5469 j 130 South Wilson Way, Stockton,California iElevation Top of Well Static Water Groundwater Groundwater Ethyl- Total Well Top of Casing Screen Level Elevation Flow TPHG Benzene Toluene benzene Xylene MTBE[I] Number Date (feet ms]) (feet bgs) (feet bgs) (feet ms Direction 1tg/L gg/L pg/L gglL gg/L gg/L MW-10 06125/01 16.40 59 38.00 -21.60 E-NE NS NS NS NS NS NS P 06/28/01 16.40 38.18 -21.78 NC <50 51 <0.5 <0.5 <0.5 260[2] P 09/14/01 16.40 39.64 -23.24 NE 88 4.1 <0.5 <0.5 <0.5 44[2] P 12/14/01 16.40 40.52 -24.12 NE 77[8] <0.50 <0.50 <0.50 <0.50 35[2] P 02/21/02 16.40 40.50 -24.10 E-NE <50 1.2 <0.50 <0.50 <0.50 27[2] P 04/23/02 16.40 40.47 -24.07 NE <50 1.2 <0.50 <0.50 <0.50 35[2] j P 09/19/02 16.40 42.46 -26.06 NE 54[121 1.0 <0.50 <0.50 <0.50 66[2] P 12/11/02 16.40 43.21 -26.81 NE <50 0.58 <0.50 <0.50 <0.50 83[2] NOTES: [11 MTB$was analyzed using USEPA Method 8020. TPHG=Total petroleum hydrocarbons as gasoline [21 MTBE was analyzed using USEPA Method 8260. MTBE=Metbyl tert-butyl ether [31 The value reported exceeds the calibration curve,but not the linear range. NA=Not analyzed [4)Chromatogram Pattern: Weathered Gasoline C6-C12. NC=Not calculated [51 The reporting limits for this sample have been raised due to the high level of a target compound. NS=Not sampled 161 The reporting limit(s)for this sample have been raised due to high levels of non-target inteferents. msl=mean sea level i [71 Sample was diluted due to high levels of Benzene. bgs-below ground surface [8]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. gg/L=micrograms per liter [9]Sample was reanalyzed past EPA recommended holding time. <=Below detection limit for the analytical methods used. [101 The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits [I I I Laboratory report indicates discrete peak at MTBE and Benzene [12]Laboratory report indicates discrete peak at MTBE [131 The concentration indicated for this analyte is an estimated value above the calibration range of the instrument. j i [141 This sample analyzed beyond the EPA recommended holding time. The results may still be useful for their intended purpose. [151 Based on notes in laboratory report and conversation with laboratory(11119/02),this TPHG result is due entirely to presence of MTBE. No other compounds eluted in the TPHG range. (Refer to Stratus' Quarterly Groundwater Monitoring Report, Third Quarter 1001, dated November 20,2002). [161 The continuing calibration standard was outside of the acceptance criteria. This should be considered in evaluating the result for its intended purpose. (171 The sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits [181 Discrete peak @ C6-C7 I I 5TKA TL15 Arco_5469_Quarterl y_Uata S of 5