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i • • TABLE 1 GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY ARCO Service Station No. 5469 130 South Wilson Way, Stockton,California Elevation Top of Well Static Water Groundwater Groundwater Ethyl- Total Well Top of Casing Screen Level Elevation Flow TPHG Benzene Toluene benzene Xylene MTBE[l] Number Date feet msi (feet b s) feet b s feet msl Direction µ L L L µ µ L PgtL MW-10 06/25/01 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 <0.5 264[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] P 09/19/02 16.40 42.46 -26.06 NE 54[12] 1.0 <0.50 <0.50 <0.50 66[2] sl mean sea level NS=Not sampled g=below ground surface NA=Not analyzed g/L=micrograms per liter c=Below detection limit for the analytical methods used. i [11 MTBE was analyzed using USEPA Method 8020. NC=Not calculated [21 MTBE was analyzed using USEPA Method 8260. [31 The value reported exceeds the calibration curve,but not the linear range. [4]Chromatogram Pattern: Weathered Gasoline C6-C 12. [51 The reporting limits for this sample have been raised due to the high level of a target compound. [6]The reporting limit(s)for this sample have been raised due to high levels of non-target inteferents. [7]Sample was diluted due to high levels of Benzene. f 8]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. {, [91 Sample was reanalyzed past EPA recommended holding time. [10]The sample was diluted due to the presence of high levels of target analytes resulting in elevated reporting limits 11]Laborawry report indicates discrete peak at MTBE and Benzene [121,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. [14]Sample analyzed beyond the EPA recommended holding time. [15]Based on notes in laboratory report and conversation with laboratory(11/19/02),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 1002, dated November 20,2002). 5TKATU5 Arco_5469_Quarterly_Data 5 of 5