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0 Table 1 Groundwater Elevation and Analytical Data(CHEVRON) Chevron Service Station#9-4275 2905 Benjamin Holt Drive Stockton California Well Groundwater Depth Ethyl Xylenes Well Date Elevation Elevation to Water TPI-Ig Benzene Toluene benzene (total) MtSE ID Sampled A MSL) A MSL} (ft TOC) NO) (119/0 (ug/9 (ug/) NO) (119/1} MW-1 03!22189 224 1405 16 29 30 000 3 600 1 300 1 100 2 700 — 06/12/89 1467 1691 20 000 4 400 1 600 2 900 5 900 — 09/07/89 1614 1838 20 000 4 100 480 920 1 500 — 12/18/89 1536 1760 17 000 4200 200 17 1200 — 03/20190 1498 1722 13 000 6 400 580 2200 1200 — 0710% 1580 1804 17 000 4 800 410 1 300 11200 — 10/19/90 1710 1934 16 000 4 800 290 1 700 700 — 10/19/90 (0) -- — 17 000 5 600 270 1 700 660 — 01/17/91 1680 1904 10 000 3 100 38 950 170 01/17/91 (D) -- — 9 800 3200 39 980 170 — 03/19/91 — — 16 000 2 900 45 960 290 — 07/18/91 1696 1920 12 000 3 300 90 1 100 250 07118!91 (D) — — 12 000 3 300 90 1 100 250 10/31/91 1738 1962 9 800 2 600 18 720 180 — 01/16/92 1658 1882 12 000 3 600 54 960 370 — 03/11/92 1538 1762 — — — — — — 03/17/92 1536 1760 9 800 3 600 150 700 360 — 06/29/92 1698 1922 7 700 3 000 33 600 230 — 12/10/92 1752 1976 4 900 1 300 26 220 130 — 02f04193 1042 1266 15 000 3 100 70 920 540 — 05/18/93 1362 1586 8 800 1900 120 730 640 — 08/05/93 1450 1674 29 000 9 400 1 800 2 900 4 900 — 11/09/93 1500 1724 13 000 3 600 110 810 870 — 01/18/94 1474 1698 24 000 5 600 100 1900 2 300 — 06/27/94 1401 1625 8 400 2 300 59 520 700 — 09/29/94 1520 1744 9 600 2 100 25 530 590 — 12/08/94 1478 1702 5 700 1 300 19 290 260 — 03/08/95 1252 1476 4 600 1 100 X25 230 280 — 06/01/95 1099 1323 27 000 4 100 300 1 800 4 000 — 09/11/95 1293 1517 12 000 2 400 140 790 1900 — 12/05/95 1346 1570 8 800 2 500 32 450 710 — 14Chevron19427STenodic Mandonng%QMR194275-NF xis 1 of 20