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TABLE 1 GROUNDWATER MONITORING DATA ARCO Service Station No 6080 USEPA Method 8015/8020(DHS LUFT) 85 Louise Avenue,Lathrop,California Elevation Static Water Groundwater Groundwater Ethyl- Total Well Sample Top of Casing Level Elevation Flow TPHG Benzene Toluene benzene Xylenes Number Date feet msl feet b s feet ms]) Direction L t L L L L MW-1 P 06/23/00 1448 847 601 NB <50 <0 5 <0 5 <0 5 <0 5 NP 09/08/00 953 495 I lat 613 t <0 5 <0 5 <0 5 1 29 NP 12/11/00 9 97 451 NE 387 2 <0 5 <0 5 <0 5 1 89 P 03/22/01 891 557 NW 8462 341 <05 <05 <05 P 06/25/01 937 5 11 E <50 <0 5 <0 5 <0 5 <0 5 P 09/24/01 1040 408 E <SO <0 S <0 S <0 5 <0 S P 12/03/01 1032 416 E <50 <0 50 <0 50 <0 50 <0 50 P 03/18/02 8 94 554 E NE <50 <0 50 <0 50 <0 50 14 P 06/20/02 980 4 68 E <50 <0 50 <0 50 <0 50 <0 50 MW-2 P 06/23/00 1363 773 590 NE <50 <0 5 <0 5 <0 5 <0 5 NP 09/08/00 867 496 flat <50 <0 5 <0 5 <0 5 <0 5 NP 12/11/00 9 14 449 NE <50 <0 5 <0 5 <0 5 <0 5 P 03/22/01 805 558 NW <50 <0 5 <0 5 <0 5 <0 5 P 06/25/01 857 506 E <50 <0 5 <0 5 <0 5 <0 5 P 09/24/01 958 4 05 E <50 <0 5 <0 5 <0 5 <0 5 P 12/03/01 949 4 14 E <50 <0 SO <0 50 <0 50 <0 50 P 03/18/02 8 14 549 E-NE <50 <0 50 <0 50 <0 50 <0 SO P 06/20/02 900 4 63 E <50 19 <0 50 <0 50 <0 50 MW-3 P 06/23/00 1400 8 11 5 89 NE <50 <0 5 <0 5 <0 5 <0 5 NP 09/08/00 9 05 4 95 Flat <50 <0 5 <0 5 <0 5 <0 5 NP 12/11/00 951 449 NE <50 <0 5 <0 5 <0 5 <0 5 P 03/22/01 845 555 NW <50 <0 5 <0 5 <0 5 <0 5 P 06/25/01 891 509 E <50 <0 5 <0 5 <0 5 <0 5 P 09/24/01 994 406 E <50 <0 5 <0 5 <0 5 <0 5 P 12/03/01 985 4 15 E <50 <0 50 <0 50 <0 50 <0 50 P 03/18/02 850 550 E-NE <50 <0 50 <0 50 <0 50 <0 50 P 06/20/02 935 465 E <50 <0 50 <0 50 <0 50 <0 50 nisl=mean sea level P=Pwged bp=below ground surface NP—Not Purged <=Below detection[unit for the analytical niethods used Chromatogram Pattern Weathered Gasoline C6 C12 f Unidenuried Hydrocarbons C6 C12 Chromatogram Pattern Unidentified Hydrocarbons C6 C l2 Arco_6080_Qu1r lerly_Da to 1 of i