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TABLE 1 Groundwater Elevation and Analytical Data ARCO Service Station No 6080 USEPA Method 8015/8020(DHS LUFT) 85 Louise Avenue,Lathrop,California Top of Casing Static W ater Groundwater Groundwater Ethyl 'Total Well Sample Elevation Level Elevation Flow TPHg Benzene Toluene benzene Xylenes MtBE Number Date (feet msl) (feet bgs) (feet msl) Direction µg/l- gg1L µg/L µg/L tig/L Pg/L MW 1 P 6/23/2000 1448 647 601 NE <50 <0 5 <0 5 <05 <0 5 454 NP 9/6/2000 953 495 Flat 613 <0 5 <0 5 <0 5 129 210 NP 12111/20o0 997 451 NE 3872 <0 5 <0 5 <0 5 189 187 P 3/22/2001 891 557 NW 84 6' 341 <0 5 <0 5 <0 5 145 P 6/25/2001 937 511 E <50 <0 5 <0 5 <0 5 <05 170 P 9/24/2001 1040 408 E <50 <0 5 <0 5 <0 5 <0 5 29 P 12!3/2001 1032 4 16 E <50 <0 50 <0 50 <0 50 <0 50 150 P 3/18/2002 894 564 E-NE <50 <0 50 <0 50 <0 50 14 48 P 6/20/2002 980 468 E <50 <0 50 <0 50 <0 50 <0 50 18 P 9/9/2002 999 449 SE <50 <0 5 <0 5 <0 5 <0 5 22 P 12/6/2002 1059 389 E <50 <0 5 <0 5 <0 5 <0 5 26 P 3/14/2003 992 456 NE <50 <05 <0 5 <0 5 <0 5 052 P 6/6/2003 921 527 E-NE <50 <0 5 <0 5 <0 5 <0 5 19 MW-2 P 6/23/2000 1363 773 590 NE <50 <0 5 <0 5 <0 5 <0 5 166 NP 911812000 867 496 Flat <50 <0 5 <05 <05 <0 5 102 NP 12/11/2000 914 449 NE <50 <0 5 <0 5 <0 5 <0 5 284 P 3/22/2001 805 558 NW <50 <0 5 <0 5 <0 5 <0 5 316 P 6/25/2001 857 506 E <50 <05 <0 5 <0 5 <0 5 36 P 9/24/2001 958 405 E <50 <0 5 <0 5 <0 5 <0 5 56 P 12!312001 949 414 E <50 <0 50 <0 50 <0 50 <0 50 58 P 3/18/2002 814 549 E-NE <50 <0 50 <0 50 <0 50 <0 50 43 P 9Y1Bb1P69Q�7.4p'1^' 900 463 E <50 1 9 <0 50 <0 50 <0 50 56 P 9/9/2002 919 444 SE 170 14 <0 5 55 25 120 P 1216!2002 979 384 E 53 <0 5 <05 <0 5 <0 5 <2 6 P 3/14/2003 915 448 NE 120 <0 5 <0 5 <05 <0 5 82 P 6/6/2003 879 484 E-NE <50 <0 5 <0 5 <0 5 <0 5 079 MW-3 P 6/23/2000 1400 811 589 NE <50 <05 <0 5 <0 5 <0 5 <2 0 NP 9/8/2000 905 495 Flat <50 <0 5 <0 5 <0 5 <0 5 <2 0 NP 12/11/2000 951 449 NE <50 <0 5 <0 5 <0 5 <0 5 <2 0 P 3/22/2001 845 555 NW <50 <0 5 <0 5 <0 5 <0 5 <2 0 P 6/25/2001 891 509 E <50 <0 5 <0 5 <0 5 <05 <2 0 P 9/24/2001 994 406 E <50 <0 5 <0 5 <0 5 <05 <2 0 P 12/3/2001 985 415 E <50 <0 50 <0 50 <0 50 <0 50 16 P 3/18/2002 850 550 E-NE <50 <0 50 <0 50 <0 50 <0 50 062 P 6/20/2002 935 465 E <50 <0 50 <0 50 <0 50 <0 50 056 P 9/9/2002 953 447 SE <50 <05 <0 5 <05 <0 5 055 P 12/6/2002 1014 386 E <50 <0 5 <0 5 <0 5 <0 5 18 P 3/14/2003 950 450 NE <50 <0 5 <0 5 <0 5 <0 5 <0 50 P 6/6/2003 903 497 E-N E <50 <0 5 <05- <0 5 <0 5 <0 5 'Chromatogram Pattern Weathered Gasoline C6-C12>Unidentified Hydrocarbons C6-C12 z Chromatogram Pattern Unidentified Hydrocarbons CG-C12 <=Below detection limit for the analytical methods used bgs=below ground surface msl=mean sea level NP Not Purged P=Purged TPHg-Total petroleum hydrocarbons as gasoline µg/L=micrograms per Liter • K 1WprocesslJS BP ARC010608010uartertyl2 QTR 0316080 GW MR 2003 1of1