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0 a. r TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California i ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug/L) (ug1L) (ug1L) Jug/L) (ug/L) (ug/L) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) ug/L (feet) (feet msl) (feet mel) Comments j MW-1 03!31!98 96 <0.5G <0.50 <0.50 <0.50 <5.0 na na na na na na 62.27 26.29 -39.98 screened 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns 59.59 -33.30 no comment Interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns 59.68 -33.39 no comment 75'•90' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns $7.70 -31.41 no comment 03/25/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.71 -29.42 no comment 06/03199 <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 55.13 -28.84 no comment 08/30/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 50.50 <5.0 <50 <5.0 <0.50 <0.50 57.38 -31.09 no comment 0 12110199 550 50.50 50.50 c .50 c0.50 50.50 50.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.18 -30.89 no comment 0 03103100 94 50.50 c .50 c0-50 50.50 50.50 c0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.22 -29.93 no ododno sheen 06!26100 130 <D.50 <0.50 50.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 50.50 55.12 -28.83 no odor/no sheen 09/28100 240 <G.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 57.43 -31.14 no odortno sheen 12/22/00 180 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.56 -30.27 no odortno sheen 03/28/01 180 <0.50 1.5 <0.50 1.2 <5.0 na na na na na na na na 55.61 -29.32 no odortno sheen 06/27/01 35G <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 57.43 -31.14 no odortno sheen MW-2 03/31/98 5000 1100 86 71 270 <25.0 na na na na na na 61.45 25.42 -36.03 screened 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.76 -33.34 no comment Interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.82 -33.40 no comment 76'-91.5' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns 56.83 31.41 no comment 03/25/99 1600 130 1.7 1.1 50 0.62 <0.50 <0.50 <0.50 6.1 <50 25 54.90 -29.48 no comment 06!03199 14,000 8300 730 510 2100 <0.50 <0.50 <0.50 <0.50 <5.G <50 <5.0 28 0.72 54.27 -28.85 no comment j 08/3D199 42,000 8900 $000 1200 5800 0.62 2.0 <0.50 <0.50 <5.0 <50 <5.0 45 40 56.48 -31.06 no comment 12/10/99 12,000 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 03103/00 5100 1800 33 160 62 <5.0 <5A <5.0 <5.0 <50 <50 <50 <5.0 <5.0 54.91 -29.49 no odorino sheen 06/22100 22,000 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 09/28/00 16,000 4100 800 260 1500 <50 na na na na na na na na 56.55 -31.13 slight odorino sheen 12/22/00 6100 1200 120 200 330 <50 na na na na na na na na 55.73 -30.31 slight odor/no sheen ` 03/28/01 31000 7600 610 1000 3300 <200 na na na na na na na na 54.69 -29.27 odorino sheen ` 06/27/01 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1,900 <25 <25 56.48 -31.06 odor/no sheen I MW-3 03!31198 72 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.53 25.54 -35.99 screened 06110198 ns ns ns ns ns ns ns ns ns ns ns ns 58.85 -33.31 no comment Interval D9108198 ns ns ns ns ns ns ns ns ns ns ns ns 58.94 -33.40 no comment 75'-90' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns 56.96 -31.42 no comment 03125199 73 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.01 -29.47 no comment 06/03/99 65 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 88 <0.50 54.39 -28.85 no comment 08/30/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 80 <0.50 56.61 -31.07 no Comment 12110/99 51 <0.50 <0.50 <0.50 <0.50 <0.5b <0.50 <0 50 <0.50 <5.0 <50 <5.0 60 <0.50 56.47 -30.93 no comment 03/03/00 <50 <0.50 <0.50 <0.50 <0.50 5.0 <0.50 <0.50 <0.50 <5.0 <50 <5.0 32 <0.50 55.39 -29.85 no odortno sheen 06/22/00 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 50.50 <0.50 <5.0 <50 21 18 <0.50 54.32 -28.78 no odor/no sheen 09/28/00 <50 <0.50 <0.50 50.50 <0.50 <5.0 na na na na na na na na 56.71 -31.17 no odor/no sheen 12!21100 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 55.77 -30.23 no odorino sheen 03128101 <50 <G.50 0.55 <0.50 <0.50 <5.0 na na na na na na na na 54.85 -29.31 no odorino sheen 06127101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 11 <0.50 56.45 -30.91 no odor/no sheen 474gmr -L6 Project No.1474.44 Page 1 of 6 HORITX711'EIQVIROI!iMENTAL ItTtC.•