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Ta Groundwater Monitoring and Analytical Results +` Chevron Service Station#9-4275 2905 West Benjamin Holt Drive Vertical Measurements are in feet Stockton,California Analytical results are in parts per billion(ppb) Well Ground Depth DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE Elev Elev Water Gasoline Benzene MW-1 03/22/89 2 24 -14 05 1629 -- 30,000 3600 1300 1 100 2700 06/12/89 224 -1467 1691 -- 20,000 4400 1600 2900 5900 09/07/89 224 -16 14 1838 - 20,000 4100 480 920 1500 12/18/89 224 -1536 1760 -- 17,000 4200 200 17 1200 - 03/20/90 224 -14 98 1722 - 13,000 6400 580 2200 1200 - 07/03/90 224 -15 80 18 04 -- 17,000 4800 410 1300 1200 10/19/90 224 -1710 1934 -- 16,000 4800 290 1700 700 10/19/90 224 -- -- Duplicate 17,000 5600 270 1700 660 01/17/91 224 -1680 1904 -- 10,000 3100 38 950 170 -- 01/17/91 224 -- -- Duplicate 9800 3200 39 980 170 03/19/91 224 -- -- 16,000 2900 45 960 290 - 07/18/91 224 -1696 1920 -- 12,000 3300 90 1100 250 -- 07/18/91 2 24 -- -- Duplicate 12,000 3300 90 1100 250 10/31/91 224 -1738 1962 -- 9800 2600 18 720 180 - 01/16/92 224 -1658 1882 12,000 3600 54 960 370 03/11/92 224 -1538 1762 -- -- -- -- -- -- 03/17/92 224 -1536 1760 - 9800 3600 150 700 360 06/29/92 224 -1698 1922 -- 7700 3000 33 600 230 12/10/92 224 -1752 1976 -- 4900 1300 26 220 130 02/04/93 224 -1042 1266 -- 15,000 3100 70 920 540 05/18/93 224 -1362 1586 -- 8800 1900 120 730 840 08/05/93 224 -1450 1674 - 29,000 9400 ]Soo 2900 4900 11/09/93 224 -15 00 1724 -- 13,000 3600 110 810 870 01/18/94 224 -1474 1698 -- 24,000 5600 100 1900 2300 -- 06/27/94 224 -1401 1625 -- 8400 2300 59 520 700 09/29/94 224 -1520 1744 -- 9600 2100 25 530 590 -- 12/08/94 224 -1478 1702 -- 5700 1300 19 290 260 03/08/95 224 -1252 1476 -- 4600 1100 <25 230 280 9-4275 zls/#386845 1 As of 06/13/00