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MonitoringTaUnd 0 Groundwater Monitoring 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 Bead Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE Elev Elev Water Gasoline Benzene MW-5(cont) 03/19/91 379 -- .. __ 6,800 18 24 21 790 07/18/91 379 -15 93 1972 -- 7,600 60 65 190 800 10/31/91 379 -1641 2020 -- 2,600 44 24 64 310 - 01/16/92 379 -1581 1960 -- 5,400 120 72 250 1,000 -- 01/16/92 379 -- -- Duplicate 4,700 110 63 230 960 - 03/11/92 379 -1485 1864 -- -- -- -- -- -- 03/17/92 3 79 -1474 1853 1,100 37 13 52 170 06/29/92 379 -1639 2018 -- 850 18 9 0 25 200 12/10/92 379 -1699 2078 -- 1,200 49 16 64 200 - 02/04/93 379 -15 23 1902 -- 1,200 31 12 58 250 05/18/93 379 -1295 1674 -- 2,000 58 10 170 190 - 08/05/93 379 -1376 1755 -- 750 32 4 6 50 100 - 11/09/93 379 -1449 1828 - 1,400 29 3 8 46 190 01/18/94 379 -1398 1777 -- 1,200 31 4 8 75 180 06/27/94 379 -1340 1719 -- 150 6 2 ND 0 6 19 01/18/94 379 -1468 1847 - 1,400 29 3 0 40 160 - 01/18/94 379 -1437 18 16 - 1,000 19 3 7 28 130 03/08/95 379 -1233 1612 -- 750 22 0 7 30 60 06/01/95 379 -1068 1447 -- 3,600 110 13 240 390 - 09/11/95 379 -1240 1619 -- 890 40 3 8 76 140 - 12/05/95 379 -1301 1680 -- 410 6 7 <0 5 11 43 03/18/96 3 79 -951 1330 -- 740 10 <0 5 38 66 -- 06/18/96 3 79 -9 17 1296 -- 7,200 86 6 7 770 540 15 09/24/96 3 79 -1100 1479 -- 12,000 74 5 0 760 1,100 59 12/04/96 379 -1083 1462 -- 1,100 8 3 10 93 63 <5 0 02/25/97 3 79 -6 63 1042 -- 24,000 570 1,400 1,500 5,300 <50 05/06/97 379 -746 1125 - 38,000 580 790 3,000 12,000 <120 09/29/97 379 -1030 1409 -- 15,000 300 <12 1,500 1,000 <120 9 4275 xls/#386845 9 As of 09/13/00