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Ta Groundwater Monitoringand 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-2 03/22/89 3 41 -1413 1754 - 9000 750 20 480 730 06/12/89 341 -1478 1819 - ND 1200 80 710 870 - 06/12/89 341 -- -- Duplicate 11,000 1400 90 790 1100 09/07/89 341 -1625 1966 -- 14,000 3200 ND 1200 800 12/18/89 3 41 -15 44 1885 -- 10,000 2500 ND 1300 340 - 03/20/90 341 -1508 1849 -- 13,000 4800 88 2100 1500 07/03/90 341 -1566 19 07 -- 21,000 5700 600 1900 1700 07/03/90 3 41 -- -- Duplicate 14,000 5000 400 2000 920 -- 10/19/90 3 41 -1665 2006 -- 11,000 4400 77 190 340 - 01/17/91 3 41 -1690 2031 16,000 5400 68 1600 280 03/19/91 341 -- -- -- 8700 4300 50 1500 260 - 07/18/91 3 41 -1707 2048 -- 6200 1100 6 0 710 89 10/31/91 3 41 -1746 2087 - 32,000 2900 ND 1800 2700 10/31/91 341 -- -- Duplicate 33,000 2900 ND 1800 2700 01/16/92 341 -1665 2006 -- 14,000 2400 21 1100 840 03/11/92 3 41 -1549 1890 - -- -- -- -- -- 03/17/92 341 -15 45 1886 -- 13,000 3900 26 890 1100 06/29/92 3 41 -17 04 2045 -- 20,000 2800 97 2200 17 12/10/92 341 -1762 2103 -- 9900 1600 8 0 1100 930 02/04/93 3 41 -1553 1894 -- 10,000 1100 8 2 820 730 05/18/93 3 41 -1373 17 14 -- 9700 2000 25 1000 520 08/05/93 341 -1457 1798 -- 8100 1400 11 880 820 11/09/93 3 41 -15 10 1851 7400 920 20 740 140 I 01/18/94 3 41 -1480 1821 -- 2500 330 12 270 91 06/27/94 3 41 -1409 1750 -- 6500 1400 11 630 250 - 09/29/94 341 -15 28 1869 -- 15,000 900 ND 1600 87 12/08/94 341 -1487 1828 -- 8000 440 <10 870 470 03/08/95 341 -1271 1612 -- 2200 170 3 0 230 150 -- 9-4275 xlsl#386845 3 As of 06/13/00