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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station 112133 2908 Senlamm Holt Drive Stockton Cafifomna Well Depth Product Groundwater Groundwater Ethyl Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (1G MSL) (ft.TOC) (ft.MSL) Change(ft) lug") lug)-') (ug11J (ug") (ug") lug") m ) MWl 3/112002 P 781 527 1 69 <50 W 50 <0 50 <0 50 <0 50 <2 5 1 77 (cant) 61612002 P 874 - -620 -093 <50 <0 50 <0 50 <0 50 -050 5 0 220 912412002 P 10 57 - 803 183 <50 40 50 <0 50 <O50 <0 50 <2 5 078 12/17/2002 P 880 - 626 1 77 <50 <0 50 <0 50 <0 50 <0 50 <2 0 - 311812003 P 870 - 616 010 <50 <0 50 <0 50 <0 50 <0 50 <2 5 132 611712003 P 8 93 - 639 -023 <50 <0 50 <0 50 <0 50 <0 50 <2 5 0 80 W412003 a P 1073 - 819 1 80 <50 <0 50 13 <0 50 091 <0 50 056 12/18/2003 1001 - 747 072 - - - - - - - 311 612 0 0 4 P 790 - 536 211 <50 <0 50 <0 50 <0511 <0 50 <0 50 - 612212004 991 - 737 .041 - - - _ - - - MW 5 3!8!7995 1 04 1291 -- 11 87 - 1 800 43 47 33 60 - - 6l211995 1140 - 1036 151 1 300 55 27 23 75 - - 9111l1995 1365 - 1261 225 1 500 87 3 91 29 - - 121511995 1403 - 1299 -038 2200 120 <10{e) 16 11 - - 3118l1996 1082 - 978 321 8200 190 19 24 800 - - 6118/1996 950 - -846 1 32 15 000 170 <25 <25 2 500 <250 - 9125l1996 1230 - 1126 280 3 800 130 <5 84 71 <50 - 121411996 1163 - 1059 067 4200 88 <2 15 44 <20 - 311911997 P 718 -614 445 1 400 26 56 4 6 98 - 01 615/1997 P 884 - 780 166 1900 22 51 4 14 <10 02 8119!1997 NP 1025 - 921 141 <50 <0 5 <0 5 <D5 <0 5 <5 02 11!25!1997 NP 1048 - 944 -023 216 <0 5 <05 <05 <0 5 <5 - 3l2011998 P 427 - 323 621 <50 <0 5 <0 5 <O 5 <0 5 <5 22 6124/1998 Well box inaccessible 911011998 P 7 79 - -675 - <50 <0 5 <0 5 <05 <0 5 <5 - 12/17/1998 P 806 - 702 -027 995 <0 5 <05 <05 <0 5 <5 - I 1Pro)ectslARCO121331Tableslgwlables2133 xis 55 of 56