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O <br /> T1 • <br /> Groundwater Monitoring Data <br /> ARCO Service Station No 2186 <br /> 3212 North California Street, Stockton, California <br /> Elevation of Static Water[]] Screen Elevation of Total <br /> Well Top of Casing level Interval Groundwater Groundwater TPHG Benzene Toluene Ethylbenzene Xylenes MTBE[3] <br /> ISample No Date feet mst feet b s feet b s) feet ms]) Flow Direction L Observations <br /> VW-3B 05/23/96 NM 4576 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 FP,No S <br /> 11/27/96 NM 51 1� NM 280 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,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 442S NM 240 <0 5 <0 5 <0 5 <0 5 <3 0 No FP,No S <br /> 0=0/97 NM 5021 NM 200 <0 5 <0 5 <0 5 <0 5 <5 0 No FP,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 362S 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 5 222 324 15 9 No FP,No S <br /> 12/14/98 NM 37 90 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 /> 06/11/99 NM 3460 NM -- 152 1 9 <0 5 699 162 18 6 No FP,No S <br /> 09110/99 NM 3877 NM 1,210 546 <0 5 545 1 37 1590 No FP,No S <br /> 12/03/99 NM 3876 NM — 804 <0 5 <0 5 <0 5 <0 5 149 No FP,No S <br /> 04/03/00 NM 35 45 NM <50 3 38 <0 5 1 86 562 30 No FP,No S <br /> 06/22/00 NM 35 51 NM 1,690 848 3 84 227 432 3,180[4] No FP,No S <br /> 09!27/00 NM 4091 NM — NS NS NS NS NS NS No FP,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[4] No FP,No S <br /> 03/16/01 NM 37 60 NM <50 <0 5 <0 5 <0 5 <0 5 9 12[4] No FP,No S <br /> 06/21/01 NM 4043 NM <1,000** 97 53 290 750 5,000[4] No FP,No S <br /> ms1=mean sea level TPHG=Total petroleum hydrocarbons as gasoline *=Raised MRL due to high analyte concentration requiring sample dilution <br /> bgs=below ground surface MTBE=Methyl tertiary butyl ether **=Reporting limit raised due to matrix Interference <br /> [1]Measured below top of casing <=Below detection limit for the analytical method used <br /> [2]Measured from ground surface FP=Free product Measured in feet <br /> [3]MTBE was analyzed using USEPA Method 8020 S=Sheen <br /> [4]MTBE was analyzed using USEPA Method 8260 NM=Not measured <br /> [5]Chromatogram Pattern Weathered Gasoline C6-C-12 NA Not analyzed <br /> NS=Not sampled <br /> C lARC0121g61TabiesURCO 2186 Quarterly Data 5 of 5 Delta 7/24101 <br />