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e1of2 ` Table 1 Groundwater Elevation and Analytical Data _ ARCO Service 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 (it,MSL) (ft,TOC) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg(L) MW-1 6/16/00 NP 3555 5765 -2210 -- 1,340 734 669 9 45 164 <12 5 <2 0 9/19/00 NP 6068 -2513 -303 2,990 189 182 67 6 115 <50 0 242 0 3 1112/00 P 6074 -2519 -006 3,000 258 46 7 105 196 <25 0 2 5 2 9 3/5101 P 60 90 -2535 -016 4,250 479 686 208 386 203 128 52 5/8/01 P 6140 -2585 -050 2,130 179 109 590 914 771 4 59 043 811101 P 6317 -27 62 -177 120 2 5 <0 50 <0 50 <0 50 2 8 12 1 53 10/23/01 P 64 53 -2898 -136 770* <5 0 <5 0 <5 0 <5 0 39 3 7 030 211102 P 6394 -2839 069 520* 15 1 1 14 <0 50 29 31 0 53 MW-2 6/16100 NP 3294 5572 -2278 -- 655 28 0 882 2 58 194 179 116 9119100 NP 58 43 -2549 -271 495 3 64 <0 50 <0 50 145 760 93 6 0 6 11/2/00 P 59 42 -26 48 -0 99 428 126 <0 50 177 204 80 8 71 2 8 3/5/01 P 5839 -25 45 1 03 476 28 7 108 837 277 740 601 4 9 518101 P 5905 -2611 -066 315 135 0 638 2 85 148 778 998 0 46 811/01 P 6098 -2804 -193 630 59 61 11 16 60 76 1 36 10/23/01 P 6234 -2940 -136 590* 57 2 8 7 0 4 7 88 65 026 i 211/02 P 6233 -2939 0 01 280 14 17 2 6 3 9 79 66 030 MW-3 6/16/00 NP 3361 56 35 -2274 -- 226 289 <0 50 2 84 102 929 869 -- 9/19/00 NP 5901 -2540 -266 217 0 582 <0 50 <0 50 <0 50 <2 5 <2 0 0 5 1112100 P 5911 -25 50 -010 162 <0 50 <0 50 <0 50 <0 50 120 11 13 3/5101 P 5902 -2541 009 178 <0 500 <0 500 <0 500 0 732 4 43 7 35 5 6 5/8101 P 5975 -2614 -073 166 0 515 <0 500 <0 500 0 711 2 96 3 93 060 811/01 P 6156 -2795 -181 220 073 <0 50 <0 50 <0 50 <2 5 <2 0 105 10/23/01 P 62 91 -2930 -135 130* <0 50 <0 50 <0 50 <0 50 15 11 1 15 211/02 P 62 23 -2862 068 92* 1 1 <0 50 11 051 6 6 43 0 74 MW-4 6/16/00 NP 33 77 56 56 -2279 -- 8,910 2,310 <0 50 839 1,520 3,680 3,200 -- 9/19100 NP 5924 -25 47 -268 18,900 2,240 <20 0 693 2,230 2,240 2,510 0 4 11/2/00 P 5859 -2482 065 9,230 1,740 <50 0 154 951 1,990 2,200 17 3/5/01 P 5917 -2540 058 5,250 738 <20 0 33 5 <20 0 1,870 1,760 42 5/8/01 P 5984 -2607 -067 2,890 875 <20 0 344 <20 0 2,350 2,140 050 811/01 P 6183 -2806 -199 750 19 <2 5 6 6 <2 5 640 1,400 000 10/23/01 - - -----------------------------------------Dry Well----------------- ------------------ 211102 P 6158 -2781 — <500 <5 0 <5 0 <5 0 <5 0 770 690 028 Projects/ARCO/595/Reports ables/gwtables595 As