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Table 1 <br /> Groundwater Monitoring Data <br /> ARCO Service Station No 2186 <br /> 3212 North California Street <br /> Stockton,California <br /> E evation o r 1 Static- ateTop o E evahon o Tota <br /> Well Top of Casing Level Screen[21 Groundwater Groundwater TPHG Benzene Toluene Ethylbenzene Xylcnes MTBE[31 <br /> Sample No Date feet rnsl) {feet b s) feet b ) (feet msl) Flow Direction µg/L pg/L µg1[ µgft <br /> VW-3 05/23/96 NM 4576 41 80 NM µPSL la 3 Observations <br /> VW-3 09/19/96 NM --- 290 <0 5 <0 5 <0 5 <0 5 <3 Na FP,No S <br /> 54 02 NM --- 310 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S <br /> VW-3 11/27/96 NM 51 15 NM --- 280 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S <br /> VW-3 03/21/97 NM 4249 NM --- 180 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S <br /> VW-3 05/22/97 NM 4428 NM --- 240 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S <br /> VW-3 08/20/97 NM 5021 NM --- 200 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S <br /> VW-3 11/20/97 NM 4946 NM --- 160 46 44 26 67 <5 No FP,No S <br /> VW-3 02/17/98 NM 4472 NM 93 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S <br /> VW-3 06/24/98 NM 3628 NM -- <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S <br /> VW-3 09/21/98 NM 3969 NM 227 456 <0 5 222 324 159 No FP,No S <br /> VW-3 12/14/98 NM 3790 NM 571 <0 5 <0 5 <0 5 105 <5 No FP,No S <br /> VW-3 03/31/99 NM 3581 NM --- <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S <br /> VW-3 06/11/99 NM 3460 NM --- 152 1 9 <0 5 699 162 186 No FP,No S <br /> VW-3 09/10/99 NM 3877 NM --- 1,210 546 <0 5 54S 137 1590 No FP,No S <br /> VW-3 12/03/99 NM 3876 NM <br /> VW-3 804 <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 5 186 562 30 No FP,No S <br /> VW-3 06/22/00 NM 35 51 NM --- 1,690 848 384 227 432 3,180[4] No FP,No S <br /> VW-3 09/27/00 NM 4081 NM --- NS NS NS NS NS NS No FP,No S <br /> nut=mean sea level <br /> bgs=below ground surface *=Liaised MRI,due to high analyte concentration requiring sample dilution <br /> •*=Reporting limit raised due to matrix interference <br /> [1]Measured below toy of casing <=Below detection limit for the analytical method used <br /> [2)Measured from ground surface FP=Free product Measured in feet <br /> 131 MTBE was analyzed using USEPA Method 8020 S=Sheen <br /> (41 MTBE was analyzed using USEPA Method 9260 NM=Not measured <br /> TPHCr=Total petroleum hydrocarbons as gasoline NA Not analyzed <br /> MTBE=Methyl tertiary butyl ether NS Not sampled <br /> PAV IL[ONVAyDocumenis\ARCO\2 f MQTRLY1200012i 86Q300 <br /> 3 of 3 Wella <br /> 1029100 <br />