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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station 412133 2908 Benjamin Holt Drive Stockton Cal fom a Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPNg Benzene Toluene benzene (total) MtBE DO Number Sampled (it,MSL) (1t,TOC) (ft) (it,MSL) Change(ft) (ugA) (ugA) (ugA) (ug/1) (ug/1) (ugA) (mg/L) 3121194 1529 1403 056 28 000 2 900 290 1 700 4 500 E 10 6127194 1510 1384 019 25 000 3 000 180 1900 4 100 (cant) 9129194 1611 1465 1 01 27 700 3,200 150 1 780 2 900 12/3194 15 71 — 1445 040 18,000 3,300 110 1 700 3 000 3!8195 1328 1202 243 38 000 2 100 260 1 800 4 000 6/1/95A 1449 2 74 11 18 0 84 - -- — 9/11/95A 1501 1 31 12 77 1 59 -- 12/5195A 1464 037 1310 034 — 3/18/96 955 829 481 370 000 7,300 2200 9 900 62 000 6/18196 8137 761 068 400,000 390 3 600 2000 16 000 6200 9/25196 1258 1132 371 28 000 2,100 3 900 600 5 100 16 000 12!4/96 1205 1079 053 55,000 3,600 3 900 1 300 9 800 27,000 3119197 P 737 611 468 1 600 39 43 52 48 1 100 01 6/5/37 NP 897 771 160 100 2 8 <0 5 <05 2 0 61 01 8/19197 NP 1043 917 146 750 18 3 0 36 19 1 900 01 11/25197 NP 1161 1035 118 10 000 1 000 320 200 1 400 46 000 3/20198 P 465 339 696 7 300 2000 68 350 260 32 000 55 6!24198 P 666 540 201 15 000 110 130 120 660 19 000 1 0 9/10/98 NP 8 32 706 166 196 686 1 18 1 23 6 17 1 870 12/17/98 NP 842 716 010 5,020 1 230 516 239 313 17 600 3110/99 P 6 21 495 221 1 620 235 142 71 9 859 3 980 82 6/22199 NP 877 751 256 160 707 0 685 <0 5 <05 893 33 9/13199 NP 981 855 104 128 931 <0 50 <0 50 1 23 299 1 8 12/16/99 NP 945 819 0 36 10 800 2 290 607 433 515 17 800 1 4 3/23/00 P 4 78 352 4 67 1,520 161 <10 0 455 21 2 3 310 1 7 6121100 P 7 04 578 226 3 770 434 367 560 286 429 0 06 9113100 NP 879 753 175 1 130 155 662 106 470 1 030 1 85 12!15100 P 825 — 699 054 18 200 1,440 82 4 245 424 10 700 070 3/2101 P 619 sheen 493 2 06 6,830 1,770 <50 0 131 228 19 600 5110101 P 662 536 043 4 500 879 22 9 721 354 2,750 — M2/01 P 905 779 2 43 8,800 810 250 360 1 500 13,000 12/5101 P 848 722 057 11 000' 2 400 110 580 600 37 000 6 76 3112102 P 647 521 2 01 <20 000 610 <200 <200 450 44 000 086 616/02 P 735 — 6 09 068 8,400' 200 <50 <50 <50 14,000 022 9124102 P 910 784 1 75 570" 58 <2 5 <2 5 <2 5 780 Oil 12/17/02 P 797 671 113 12,000 620 68 160 <20 8 500 3118/03 P 745 619 052 1 100 6 5 <5 0 <50 <50 1 300 108 6117103 P 749 623 0 04 170 37 <1 0 1 5 35 290 010 W24103 a P 925 — 799 178 6,200 240 110 300 1,300 11500 101 I 1Projects\ARC0121331Tableslgwtables2133 Page 18 of 36