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I Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station#2133 2908 Benjamin Holt Dnve Stockton California Well Depth Product Groundwater Groundwater Ethyl Xyrenes Well Date Elevation to Water Thickness Elevation Elevation TPtig Benzene Toluene benzene (total) MtBE DO Number Sampled ft,MSL ft,TOC ft ft,MSL) Change(ft) ug/l) W) ugA) (ug") (ugA) (ugA) (mg/a_) E 10 3/8/1995 1328 — 1202 243 38 000 2 100 260 1 800 4 000 (cont} 61t195A 1449 274 1118 0 84 9/11/95A 1501 131 1277 159 12/5/95A 1464 037 1310 034 3/1811996 955 — -829 481 370 000 7 300 2 200 9 900 62 000 6/1811996 887 — 761 068 400 000 390 3 600 2000 16 000 6 200 9/2511996 1258 — 11 32 371 28 000 2 100 3 900 600 5 100 16 000 12/4/1996 1205 — 1079 053 55 000 3 600 3 900 1 300 9 800 27 000 3/19/1997 P 7 37 — -611 4 68 1 600 39 4 3 52 48 1 100 01 6/5/1997 NP 897 — 771 1 60 100 2 8 <05 <0 5 2 0 61 01 811911997 NP 1043 — 917 146 750 18 3 0 3 6 19 1 900 01 11/25M997 NP 1161 — 1035 1 18 10 000 1 000 320 200 1 400 46 000 =011998 P 4 65 — 339 696 7 300 2 000 68 350 260 32 000 55 6/24/1998 P 6 66 — 540 2 01 15 000 110 130 120 660 19 000 10 911011998 NP 8 32 — 706 1 66 196 686 1 16 1 23 617 1 870 12 i 711998 NP 842 — 716 -010 5 020 1 230 51 6 239 313 17 600 3/1011999 P 6 21 — -495 221 1 620 235 142 71 9 659 3 980 8 2 6/22119% NP 8 77 — 751 256 160 707 0 685 <0 5 <0 5 893 3 3 9!1311999 NP 9 81 -- 855 104 128 931 4 50 <0 50 1 23 299 1 8 12116!1999 NP 945 — -819 0 36 10 600 2 290 607 433 515 17 800 1 4 312312 0 0 0 P 4 78 — 352 4 67 1 520 161 <10 0 455 21 2 3 310 1 7 6/21/2000 P 7 04 — 5 78 226 3 770 434 36 7 56 0 286 429 006 9/1312000 NP 8 79 — 753 1 75 1 130 155 6 62 10 5 470 1 030 185 1 211 512 0 0 0 P 825 -- -699 054 18 200 1 440 82 4 245 424 10 700 0 70 3/2/2001 P 619 sheen -4 93 206 6 830 1 770 <50 0 131 228 19 600 5/1 CV2oot P 662 — 536 043 4 500 879 229 721 354 2 750 8/22/2001 P 905 — 779 243 8 800 810 250 360 1 500 13 000 12/5/2001 P 848 -- 7 22 057 11 000 2 400 110 580 600 37 000 676 3112/2002 P 647 — 521 2 Ot <20 000 610 <200 <200 450 44 000 0 86 6/6/2002 P 7 35 -- -609 0 88 8 400 200 <50 <50 <50 14 000 022 9!2412002 P 910 -- 7 84 1 75 570 58 <2 5 <2 5 <2 5 780 0 11 12J1 7/2002 P 797 — -671 113 12 000 620 68 160 <20 8 500 3/1 812 00 3 P 745 — -619 0 52 1 100 6 5 <50 <5 0 <5 0 1 300 1 08 &17/2003 P 749 -- .623 -0 04 170 37 <1 0 1 5 35 290 010 E 11 8/26/1968 342 -- — — — — — — 11/2811988 — _ — 440 380 110 460 2/2711989 — — 400 250 120 820 5/30/1989 — — — — 437 162 97 281 8122/1989 160 36 38 220 1214/1989 _ _ — 240 26 38 290 1/4/1990 1839 1497 — 2/1/1990 1819 — 14 77 020 2115!1990 1816 1474 003 2/22/1990 1893 — 1551 -077 — 3187t990 t791 — 1449 102 — 801 313 756 242 f 1ProjectslARCO521331Tableslgwlables2133xis Page 15 of 29