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• • TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total 1 1Depth to FOC GW Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanal EDC EDB GW Elevation Elevation Number Date a 1L WWI-) ug/L) u 1L u 1L u /L u 1L u /L ug/L a 1L u !L u 1L u 1L u 1L feet feet msl feet msl Comments Mw-1 03!31!96 96 <0.50 <0.50 <O,SD <0.50 -7-5-0 na na na na na na na T 2.27 26.29 39.98 screened 06!10!98 ns ns ns ns ns ns ns ns ns ns ns ns na 9.59 -3330 no comment interval WOW% ns ns ns ns ns ns as ns ns ns ns ns na 9.68 -33.39 no comment 75'-90' 12!30198 ns ns ns ns ns ns ns ns ns ns ns ns na 7)0 -31.41 no comment 03/25!49 <50 <0.5o <0.50 <0.50 <0.50 <0.50 <050 <0.50 <0.50 <5.0 <50 <5.0 na 5.71 -29.42 no comment 06!03199 <50 <D5D <050 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5,0 <50 <5.D <0.50 <05.13 -28.84 no comment 08/30199 <50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0,50 <050 57.38 -31.09 no comment 12110199 <50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0,50 57.18 -30.89 no comment 03103/00 94 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0 50 <0.50 <5A <50 <5.0 <0.50 <0.50 56.22 -29.93 no odorino sheen 06126/00 130 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5D <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.12 -28.83 no odor/no sheen 09128/00 240 <0,50 <0.50 <0,50 <0.50 <5.0 na na na na na na na na 57.43 -31.14 no odor/no sheen 12122100 180 <0L0 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.56 -30.27 no odor/no sheen 03128101 180 <0.50 1.5 <0,50 1.2 <5.0 na na na na na na na na 55.61 29.32 no odorino sheen 06727/01 350 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5D <50 <5.0 <0.50 <0.50 57.43 -31.14 no odor/no sheen 09/06101 520 <0.50 0.68 <0.50 1.2 <5.0 na na na na na na na :3 59.22 -32.93 no odorino sheen 12103/01 500 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 59.91 33,62 no odoNno sheen 01 2t28102 790 <0.50 1.8 <0.50 <0.50 <5.0 na na na na na na na na 58.48 -32.19 no odor/no sheen 05/20/02 670 <0.50 0.64 <0.50 <0.50 <0.50 <0.50 <0.50 <DLO <5.0 <50 <5.0 0.55 <0.50 58.76 28.28 -30.48 no odor/no sheen 08/29/02 530 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 61.77 -33.49 no odor/no sheen 12106!02 740 <0.50 <0.50 c0.50 <0.50 <0_50 na na na na na na na na 69.16 -40.88 no odor/no sheen MW-2 03/31/98 5000 11 DO 86 71 270 <25.0 na na na na na na na na 61.45 25.42 -36.03 screened 06/10198 ns as ns ns ns ns ns ns as ns ns ns na na 58.76 -33.34 no comment Interval 09/08/98 ns ns as ns ns as ns n$ ns ns ns ns na na 56.82 -33.40 no comment 76'.91.5' 12/30/98 ns as as as ns ns as ns as ns ns ns na' na 56.83 -31.41 no comment 03125/99 1600 130 1.7 1.1 50 0.62 <0.50 <0.60 <0.50 6.1 <50 25 na na 54.90 -29.48 no comment 06/03/99 14000 8300 730 510 2100 <0,50 <0.50 <O.SQ <0.5D <5.p <50 <5.0 28 0.72 54.27 28.85 no comment 08/30199 42000 8900 5001) 1200 5800 0.62 2.0 <0.50 <0,50 b.0 <50 <5.0 45 40 56.49 31.06 no comment 12110/99 12000 1900 680 330 1200 <5.0 <5.0 <5.0 <5.0 <50 <50 <100 <5.0 <5.0 56,33 -30.91 no comment 03!03100 5100 1800 33 160 62 <E0 <5.0 <5.0 <5.0 <50 <50 <50 <5.0 <5.0 54.91 -29.49 no odorino sheen 06/22/00 22000 5900 530 630 1700 8,5 <5.0 <5.0 <5.0 <50 <500 <200 <5.0 <5.0 54.14 -28.72 slight odorino sheen 09128!00 16000 4100 600 260 1500 <50 na na na na na na na na 56.55 -31.13 slight odorino sheen 12/22100 6100 1200 120 200 330 <50 na na na na na na na na 55.73 -30,31 slight odorino sheen 03/28101 31000 7600 610 1000 3300 <200 na na na na nana na na 54.69 -29.27 odorino sheen 06127101 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1900 <25 <25 56.48 -31,06 odon'nosheen 09106101 8900 2000 500 210 840 <100 na na na na na na na na 58.67 -33.25 odor/no sheen 1204101 28000 6700 1600 910 4000 <250 na na na na na F na na na 58.98 -33.56 odorino sheen 03/01102 57000 12000 1200 1400 6100 <5D0 na na na na na na na na 57.62 -32.20 odorino sheen 05120102 53000 11 DDO 1500 1300 6201) <50 <50 <50 <50 <500 <5DW <506 <50 <50 57.91 27.44 -30.47 no odor/no sheen 08!30102 51DDO 99W 3200 1300 6100 <500 na na na na na na na na 60.95 -33.51 odor/no sheen 12!06!02 2WW 6400 580 770 3300 <25 na na na na na na na na 61.08 -33.64 odorino sheen 474gmNR.xls Project No,1474,44 Page 1 of 8 HORIZON ENVIRONMENTAL INC.