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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 Etbyl- Total Well Sample Top of Casing Level Elevation Flow TPHG Benzene Toluene benzene Xylencs Number Date feet msl feet b s feet ms1 Direction µ L L µ L prZL µ L MW-1 P 6/23/00 1448 847 6 01 NE <50 <0 5 <0 5 <0 5 <0 5 NP 9/8/00 953 495 Flat 6131 <0 5 <0 5 <0 5 129 NP 12/11/00 997 451 NE 387 Z <0 5 <0 5 <0 5 189 P 3/22/01 891 557 NW 8462 341 <05 <05 <05 P 6/25/01 937 5 11 E <50 <0 5 <0 5 <0 5 <0 5 P 9/24/01 1040 408 E <50 <0 5 <0 5 <0 5 <0 5 P 12/3/01 1032 4 16 E <50 <0 50 <0 50 <0 50 <0 50 P 3/18/02 894 5 54 E-NE <50 <0 50 <0 50 <0 50 14 MW-2 P 6/23/00 1363 773 5 90 NE <50 <0 5 <0 5 <0 5 <0 5 NP 9/8/00 867 4 96 Flat <50 <0 5 <0 5 <0 5 <0 5 NP 12/1 t/00 9 14 449 NE <50 <0 5 <0 5 <0 5 <0 5 P 3122101 805 558 NW <50 <0 5 <0 5 <0 5 <0 5 P 6/25/01 857 506 E <50 <0 5 <0 5 <0 5 <0 5 P 9124/01 958 4 05 E <50 <0 5 <0 5 <0 5 <0 5 P 12/3/01 949 414 E <50 <0 50 <0 50 <0 50 <0 50 P 3/18/02 8 14 549 E-NE <50 <0 50 <0 50 <0 50 <0 50 MW-3 P 6/23/00 l4 00 8 11 5 89 NE <50 <0 5 <0 5 <0 5 <0 5 NP 9/8/00 9 05 495 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 3/22/01 845 5 55 NW <50 <0 5 <0 5 <0 5 <0 5 P 6/25/01 891 5 09 E <50 <0 5 <0 5 <0 5 <0 5 P 9/24/01 994 4 06 E <50 <0 5 <0 5 <0 5 <0 5 P 12/3/01 985 4 15 E <50 <0 50 <0 50 <0 50 <0 50 P 3/18102 850 5 50 U-NE <50 <0 50 <0 50 <0 50 <0 50 msl=mean sea level P=Purged gs=below ground surface NP=Not Purged <=Below detection limit for the analytical methods used Chromatogram Pattem Weathered Gasoline C6 C12+Unidentified Hydrocarbons C6-C12 Chromatogram Pattern Unidentified Hydrocarbons C6 C12 Arco 6080_Quarterly_Data XLS Delta 1 of 1