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Table 1 Groundwater Elevation and Analytical Data(CHEVRON) Chevron Service Station 894275 2905 Benjamin Holt Dnve Staddon California Well Groundwater Depth Ethyl Xylenes well Date Elevation Elevation to Water TPHg Benzene Toluene benzene (total) ME ID Sampled A MSL) M MSL) A TOC) (u99) NOT NO) Nam NO (USIM MW 1 03!22!89 224 -1405 1629 30 000 3 600 1 300 1 100 2 700 — 06112/89 -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 — 03120/90 -1498 1722 13 000 6 400 580 2200 1200 — 07/03/90 1580 1604 17 000 4 800 410 1 300 1 200 -- 10/19/90 1710 1934 16 000 4 800 290 1 700 700 — 10/19/90 (D) — — 17 000 5 600 270 1 700 660 — 01117/91 -1680 19 04 10 000 3 1 DO 38 950 170 — 01117/91 (D) — — 9 800 3 2DO 39 980 170 — 03/19/91 — — 16 ON 2 9DO 45 960 290 — 07/18191 1696 1920 12 000 3 300 90 1 100 250 — 07118191 (D) — — 12 000 3 300 90 1 100 250 — 10/31191 1738 1962 9 800 2 600 18 720 180 -- 01116192 -1658 1882 12 000 3 600 54 960 370 — 03111192 -1538 1762 — — -- — — — 03/17192 -1536 1780 9 800 3 600 150 700 360 — 06/29192 -1598 1922 7 700 3 000 33 600 230 — 12110192 -1752 19 76 4 900 1 300 26 220 130 — 02/04/93 -1042 1266 15 000 3100 70 920 540 -- 05l18193 -1352 1586 8 80O 1 900 120 730 840 — 08/05193 -1450 1674 29 ODD 9 400 1 800 2 900 4 900 — 11/09/93 -1500 1724 13 000 3 600 110 810 870 — 01/18194 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 14 76 4 600 1 100 X25 230 280 — 06101195 -1099 1323 27 000 4 100 300 1 800 4 000 — 09111195 1293 1517 12 000 2 400 140 790 1900 — 12105195 1346 1570 8 800 2 500 32 450 710 I SChevronL4427SPertodic MondonngU M R494275_QMR xls 1 of 20