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Page 1 of 2 Table 1 Groundwater Elevation and Analytical Data ARCO Seance Station#595 6100 N Highway 99,Stockton,CA Well Depth Groundwater Groundwater Ethyl- Xylenes MtBE MtBE Well Date Elevation to Water Elevation Elevation TPHg Benzene Toluene benzene (total) (EPA 8020) (EPA 8260) DO Number Sampled (ft,MSL) (ft,TOC) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgtL) MW-1 6116100 NP 3555 57 65 -2210 - 1,340 734 6 69 945 164 <125 <2 0 - 9/19/00 NP 60 68 -2513 -303 2,990 189 182 676 115 <50 0 242 0 3 1112100 P 6074 -2519 -006 3,000 258 467 105 196 <25 0 2 5 2 9 315101 P 60 90 -2535 -016 4,250 479 686 208 386 203 128 52 518101 P 61 40 -25 85 -050 2,130 179 109 59 0 914 771 4 59 0 43 811101 P 6317 -2762 -177 120 2 5 <0 50 <0 50 <0 50 2 8 12 153 10/23/01 P 6453 -28 98 -136 770' <5 0 <5 0 <5 0 <5 0 39 3 7 030 MW-2 6116/00 NP 3294 5572 -2278 -- 655 28 0 882 258 194 179 116 -- 9/19100 NP 5843 -2549 -271 495 364 <0 50 <0 50 1 45 76 0 936 0 6 1112100 P 5942 -2648 -0 99 428 126 <0 50 177 2 04 808 71 2 8 315101 P 5839 -2545 103 476 287 1 08 837 277 740 601 4 9 518/01 P 5905 -2611 -066 315 135 0 638 2 85 1 48 778 99 8 046 811101 P 6098 -2804 -193 630 59 61 11 16 60 76 1 36 10123/01 P 6234 -2940 -135 590" 57 2 8 7 0 4 7 88 65 026 MW-3 6/16100 NP 3361 5635 -2274 - 226 289 <0 50 2 84 102 929 869 9119100 NP 5901 -2540 -2 66 217 0 582 <0 50 <0 50 <0 50 <2 5 <2 0 0 5 1112100 P 5911 -2550 -010 162 <0 50 <0 50 <0 50 <0 50 120 11 1 3 315101 P 5902 -2541 009 178 <0 500 <0 500 <0 500 0 732 443 7 35 5 6 5/8101 P 5975 -2614 -073 166 0 515 <0 500 <0 500 0 711 2 96 393 0 60 8/1/01 P 61 56 -2795 -1 81 220 073 <0 50 <0 50 <0 50 <2 5 <2 0 1 05 10/23/01 P 6291 -29 30 -135 130' <0 50 <0 50 <0 50 <0 50 15 11 115 MW-4 6/16/00 N P 33 77 56 56 -2279 8,910 2,310 <0 50 83 9 1,520 3,680 3,200 - 9/19/00 NP 5924 -2547 268 18,900 2,240 <20 0 693 2,230 2,240 2,510 0 4 1112100 P 5859 -2482 065 9,230 1,740 <50 0 154 951 1,990 2,200 1 7 3/5101 P 5917 -2540 -058 5,250 738 <20 0 335 <20 0 1,870 1,760 42 5/8101 P 59 84 -2607 -067 2,890 875 <20 0 344 <20 0 2,350 2,140 050 811/01 P 61 83 -2806 -199 750 19 <2 5 6 6 <2 5 640 1,400 000 10/23/01 -- -- — Dry Well MW-5 811/01 P 3225 6052 -2827 -- <50 <0 50 <0 50 <0 50 <0 50 <2 5 2 6 351 10/23/01 P 6186 -29 61 -134 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1 0 0 98 Projects/ARCO/595/Reports/Tables/gwtables595 As