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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No 6080 85 E Louise Avenue, Lathrop, CA TOC Depth to Water Level Ethyl- Tota! Well Date P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet ms!) (feet bgs) (feet msl) (ug/L) (Ng/L) (ug/L) (ug/L) (pg/L) WIL) (pg/L) (mg/L) Comments MW 2 12/6/2002 P 1363 979 3 84 53 <0 5 <0 5 <0 5 <0 5 <2 6 03/14/2003 P 1363 915 448 120 -- <0 50 <0 50 <0 50 <0 50 82 149 06/06/2003 P 1363 879 484 <50 <050 <0 50 <0 50 <0 50 079 312 09/15/2003 P 1363 971 392 <50 - <0 50 <0 50 <0 50 <0 50 78 0 89 12/04/2003 P 1363 948 415 <50 050 <050 <0 50 <0 50 99 -- 03/05/2004 P 1363 907 456 <50 - <050 <0 50 <0 50 <0 50 16 144 06/07/2004 P 1363 942 421 <50 <0 50 <0 50 <050 <0 50 14 1 1 09/10/2004 P 1363 991 372 <50 <0 50 <0 50 <0 50 <0 50 4 5 23 12/02/2004 P 1363 1044 319 <50 -- <0 50 <0 50 <0 50 <0 50 4 9 134 03/04/2005 P 13 63 860 503 <50 - <0 50 <0 50 <0 50 <0 50 19 1 6 05/26/2005 P 1363 878 485 <50 -- <0 50 <0 50 —<050 <0 50 12 094 09/16/2005 P 1363 911 452 <50 - <0 50 <0 50 <0 50 <0 50 22 126 112101/2005, P 1363 1017 346 <50 — <050 <0 50 1 <0 50 <0 50 090 164 MW 3 6/23/2000 P 1400 811 5 89 <50 -- <0 5 <0 5 <0 5 <0 5 <2 0 -- 9/8/2000 NP 1400 905 4 95 <50 <0 5 <0 5 <0 5 <0 5 <2 0 -- 12/11/2000 NP 1400 951 449 <50 - <0 5 <05 <0 5 <0 5 <2 0 3/22/2001 P 1400 845 5 55 <50 -- <0 5 <0 5 <0 5 <0 5 <2 0 6/25/2001 P 1400 891 509 <50 <05 <0 5 <0 5 <0 5 <2 0 -- 9/24/2001 P 1400 994 406 <50 <0 5 <0 5 <05 <0 5 <2 0 12/3/2001 P 1400 985 415 <50 -- <050 <0 50 <0 50 <0 50 16 - 3/18/2002 P 1400 850 550 <50 <0 50 <0 50 <0 50 <0 50 0 62 - 6/20/2002 P 1400 935 4 65 <50 <0 50 <0 50 <0 50 <0 50 056 9/9/2002 P 1400 953 447 <50 - <0 5 <0 5 <0 5 <0 5 055 12/6/2002 P 1400 1014 3 86 <50 <0 5 <0 5 <0 5 <0 5 1 8 03/14/2003 P 1400 950 450 <50 -- <050 <0 50 <0 50 <0 50 <0 50 1 73 06/06/2003 P 1400 903 497 <50 <0 50 <050 <050 <0 50 <0 50 297 09/15/2003 P 1400 998 402 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50 105 12/04/2003 P 1400 973 427 <50 - <0 50 <0 50 <0 50 <0 50 <0 50 -- 03/05/2004 P 1400 943 457 <50 <0 50 <0 50 <0 50 <0 50 <0 50 1 96 06/07/2004 P 1400 974 4 26 <50 <0 50 <0 50 <0 50 <0 50 <0 50 05 09/10/2004 P 14011 1017 383 <50 <050 <0 50 <0 50 <050 <0 50 1 4 12/02/2004 P 1400 1078 322 <50 <050 <0 50 <0 50 <0 50 <0 50 271 03/04/2005 P 14 00 890 510 <50 - <0 50 <0 50 <0 50 <0 50 <0 50 1 1 Report Date February 10,2006 Page 2 of 4