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• ! f 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 msl Direction ppb ppb ppb ppb ppb MW-1 P 6/23/2000 1448 847 6 01 NE <50 <G5 <0 5 <05 <05 NP 9/8/2000 953 4 95 Flat 613 <0 5 <0 5 <05 1 29 NP 12/11/2000 9 97 4 51 NE 387 2 <05 <0 5 <0 5 1 89 P 3/22/2001 8 91 5 57 NW 8462 3 41 <05 <05 <05 P 6/25/2001 937 511 E <50 <0 5 <0 5 <0 5 <05 P 9/24/2001 1040 408 E <50 <0 5 <05 <0 5 <05 P 12/3/2001 1032 416 E <50 <0 50 <0 50 <0 50 <0 50 P 3/18/2002 8 94 5 54 E-NE <50 <0 50 <0 50 <0 50 1 4 P 6/20/2002 980 4 68 E <50 <0 50 <0 50 <0 50 <0 50 P 9/9/2002 999 449 SE <50 <0 5 <0 5 <05 <0 5 MW-2 P 6/23/2000 1363 7 73 590 NE <50 <0 5 <05 <05 <0 5 NP 9/8/2000 867 496 Flat <50 <05 <05 <05 <0 5 NP 12/11/2000 914 449 NE <50 <05 <05 <05 <05 P 3/22/2001 8 05 558 NW <50 <05 <05 <05 <05 P 6/25/2001 857 606 E <50 <0 5 <05 <05 <0 5 P 9/24/2001 9 58 405 E <50 <05 <05 <0 5 <0 5 P 12/3/2001 949 414 E <50 <0 50 <0 50 <0 50 <0 50 P 3/18/2002 814 549 E-NE <50 <0 50 <0 50 <0 50 <0 50 P 3/18/2002 900 463 E <50 1 9 <0 50 <0 50 <0 50 P 9/9/2002 919 444 SE 170 14 <0 5 5 5 25 MW-3 P 6/23/2000 1400 811 5 89 NE <50 <05 <05 <05 <05 NP 9/8/2000 905 4 95 Flat <50 <0 5 <0 5 <0 5 <05 NP 12/11/2000 9 51 449 NE <50 <05 <05 <05 <0 5 P 3/22/2001 845 5 55 NW <50 <05 <05 <0 5 <0 5 P 6/25/2001 891 5 09 E <50 <0 5 <0 5 <05 <0 5 P 9/24/2001 994 4 06 E <50 <05 <0 5 <0 5 <0 5 P 12/3/2001 985 415 E <50 <0 50 <0 50 <0 50 <0 50 P 3/18/2002 8 50 550 E-NE <50 <0 50 <0 50 <0 50 <0 50 P 6/20/2002 935 465 E <50 <0 50 <0 50 <0 50 <0 50 P 9/9/2002 953 447 SE <50 <0 5 <0 5 <0 5 <0 5 6080 3QMR02 1 of 2