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I TABLE I GROUNDWATER MONITORING DATA 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[i] Number Date feet mst feet b feet b s feet rest) Direction µ L P94 L j MW-9 6/25101 16.21 59 37.91 -21.70 E-NE NS NS NS NS NS NS P 6128!01 16.21 38.05 -21.84 NC <50 <0.5 <0.5 <0.5 <0.5 <2.0[21 P 9/14/01 16.21 39.51 -23.30 NE <50 <0.5 <0.5 <0.5 <0.5 <2.0[2j P 1221 16.21 40.46 -24.25 NE <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] P 2121/02/02 16.21 40.64 -24.43 E-NE <50 3.3 <0.50 <0.50 <0.50 <0.50[2] MW-10 6125101 16.40 59 38.00 -21.60 E-NE NS NS NS NS NS NS P 6128101 16.40 36.18 -21.78 NC <50 51 <0.5 <0.5 <0.5 260[21 P 9114/01 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] j P 2!11102 16,40 40.50 -24.10 E-NE <50 1.2 <0.50 <0.50 <0.50 27[2] I m mean sea tever NS-Not sampled bgs n below ground surface NA-Not analyzed lrg/l, micrograms per liter <-Below detection limit for the analytical methods used. [Il MTBE was analyzed using USEPA Method 8020. NC-Not calculated (21 MTBE was analysed using USEPA Method 8260. [3]The value reported exceeds the calibration curve,but not the linear range. 1 41 Cbromatogram Pattern: weathered Gasoline C6-C12. 151 The reporting limits for this sample have been raised due to the high level ora target compound. [61 The reporting iimil(s)for this sample have been raised due to high levels ornon-target inteferents. [7]Sample was diluted due to high levels of Benzene. i [81 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. j I I Arco_5469_Quarterfy Dala.X S 3 of 3 Delta - I