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TABLE 1 <br /> Groundwater Monitoring Data <br /> ARCO Service Station No 2186 <br /> 3212 North California Street, Stockton, California <br /> Llevaltoll of Static Water[I] Screen Elevation of focal <br /> Well Top of Casing Level Interval Groundwater Groundwater TPHG Benzene ToiuenL Ethylbenzene Xylenes M fBE 131 <br /> Sample No Date feet msl feet b s (feet b s) (feet ms]) Flow Direction L L L L iglL t 1L Observations <br /> VW 313 05/23/96 NM 45 76 42 61 NM — 290 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S <br /> 09/19/96 NM 5402 NM 310 <0 5 <0 5 <0 5 <0 5 <3 0 No CP,No S <br /> 11/27/96 NM 51 15 NM — 280 <0 5 <0 5 <0 5 <0 5 <3 0 No HP,No S <br /> 03/21/97 NM 4249 NM — 180 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S <br /> 05/22/97 NM 4428 NM — 240 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S <br /> 08/20197 NM 5021 NM — 200 <0 5 <0 5 <0 5 <0 5 <5 0 No 1 P,No S <br /> 11/20/97 NM 4946 NM — 160 46 44 26 67 <5 0 No FP,No S <br /> 02/17/98 NM 4472 NM — 93 <0 5 <0 5 <0 5 <0 5 <5 0 No FP,No S <br /> 06/24/98 NM 3628 NM <50 <0 5 <0 5 <0 5 <0 5 <5 0 No FP,No S <br /> 09/21/98 NM 3969 NM — 227 456 <0 5 222 3 24 15 9 No FP,No S <br /> 12/14/98 NM 3790 NM — 57 1 <0 5 <0 5 <0 5 105 <5 0 No FP,No S <br /> 03/31/99 NM 35 81 NM — <50 <0 5 <0 5 <0 5 <0 5 <5 0 No FP,No S <br /> 06/11199 NM 3460 NM 152 19 <0 5 699 162 186 No FP,No S <br /> 09/10/99 NM 38 77 NM — 1,210 546 <0 5 54 5 137 1590 No FP,No S <br /> 12/03/99 NM 38 76 NM — 804 <0 5 <0 5 <0 5 <0 5 149 No FP,No S <br /> 04/03/00 NM 3545 NM — <50 3 38 <0 5 1 86 5 62 30 No FP,No S <br /> 06/22/00 NM 3551 NM — 1,690 848 3 84 227 432 3,180[4] No FP,No S <br /> 09/27/00 NM 4081 NM — NS NS NS NS NS NS No AP,No S <br /> 10/19/00 NM 4064 NM — NS NS NS NS NS NS No FP No S <br /> 12/20/00 NM 3871 NM — <50 <0 5 <0 5 <0 5 <0 5 26 5[41 No FP,No S <br /> 03/16/01 NM 3760 NM <50 <0 5 <0 5 <0 5 <0 5 9 12[41 No FP,No S <br /> msl=mean sea level TPHG=Total petroleum hydi ocai bons as gasoline *=Raised MRL due to high analyte concentra0un requiring sample dilution <br /> bgs=below ground surface MT BE=Methyl tertiary butyl ether *;=Reporting limit raised due to matrix interference <br /> [I]Measured below top ofcasing <=Below detection limit for the analytical method used <br /> 121 Measured from ground surface FP=Free product Measured in feet <br /> [31 MTBE was analyzed using USCPA Method 8020 S=Sheen <br /> [4]MTBE was analyzed using USEPA Method 8260 NM=Not measured <br /> 151 Chromatogram Pattern Weathered Gasoline C6 C 12 NA=Not analyzed <br /> NS=Not sampled <br /> { <br /> C W RCM21861 rableyU 186 Quarterly Data X[S 5 o(5 Delta 514101 <br />