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i . s TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 3440 East Main Street,Stockton,California 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) (uglL) (ug/L) (uglL) (ug1L) (uglL) (ug1L) (uglL) (uglL) (ug1L) (ug1L) (ug1L) (uglL)(uglL (feet) (feet msl) (feet msl) Comments MW-1 03/31/98 96 <0.50 <0.50 <0.50 <0.50 1 <5.0 na no na no na no na no 62.27 26.29 -39,98 screened 06!10198 ns ns ns ns ns ns ns ns ns ns ns ns no no 59.59 -33.30 no comment Interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns no na 59.68 -33.39 no comment 75'-90' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns na no 57.70 -31,41 no comment 03!25199 <50 <0.50 <0.50 <0.50 <D.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 na na 55.71 -29.42 no comment 06103199 <50 <0.50 <0.50 <0.50 <050 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <D.50 55.13 -28.84 no comment 08130/99 <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 57.38 -31.09 no comment 12!10199 <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 57.1$ 30.$9 no comment 03103/00 94 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <5.0 <50 <5,0 <0.50 <0.50 56.22 -29.93 no odor/na sheen 06/26/00 130 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.12 -28.83 no odor/no sheen 09/28/00 240 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no na no 57.43 -31.14 no odorino sheen 12/22/00 180 <0.50 <0.50 <0.50 <0.50 <5.0 no no no na no no no na 56.56 -30.27 no odor/no sheen 03128/01 180 <0.50 1.5 <0.50 1.2 <5.0 no no no no no no no no 55.61 -29.32 no odor/no sheen 06/27/01 350 <0.50 <0.50 <0.50 <0.50 <0.50 <OLD <0,50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.43 -31,14 no odor/no sheen 09/06/01 520 <0.50 0.68 <0.50 1.2 <5.0 no no no na no no no no 59.22 -32.93 no odorino sheen 12/03/01 500 <0.50 <0.50 <0.50 <0.50 4.0 na na na no na na na rta 59.91 -33.62 no odorino sheen 0212$/02 790 <0.50 1.8 <0.50 <0.50 <5.0 na no no na no no no no 58.48 -32.19 no odor/no sheen 05120102 670 <0.50 0.64 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <5.0 <50 <5.0 0.55 <0.50 58.76 28.28 -30.48 no odorino sheen 08/29/02 530 <0.50 <0.50 <0.50 <0.50 <5.G no no no na no no na no 61.77 -33.49 no odor/no sheen MW-2 03131198 5000 1100 86 71 270 Q5.0 no no na no na na nana 61.45 25.42 -36.03 screened 06110198 ns ns n$ ns ns ns ns ns ns ns ns ns no na 58.76 -33,34 no comment Interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns na- no 58.82 -33.40 no comment 76'-91.5' 12/30198 ns ns ns ns ns ns ns ns ns ns ns ns na na 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 no no 54.90 -29.48 no comment 06/03/99 14000 8300 730 510 2100 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 28 0.72 54.27 -28,85 no comment 08/30/99 42000 8900 5000 1200 5600 0.62 2.0 <0.50 <0.50 <5.0 <50 <5.0 45 40 56.48 -31.06 no comment 12/10199 12000 1900 68D 330 1200 <5.0 <5.0 <5,0 <5.0 <50 <50 <100 <5.0 <5.0 56.33 -30.91 no comment 03103100 5100 1600 33 160 62 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 <5.0 <5.0 54.91 -29.49 no ododno sheen 06122!00 22000 5900 530 630 1700 6.5 <5.0 <5.0 <5.0 <50 <500 <200 <5.0 <5.0 54.14 -28.72 slight odorino sheen 09128100 16000 4100 800 260 1500 <50 no no no no no no no no 56.55 -31.13 slight odor/no sheen 12x22/00 6f 00 1200 120 200 330 <50 no na no no no no no no 55.73 -30.31 slight odor/no sheen 03!28!0131000 7600 610 1000 3300 <200 no no no no no no no no 54.69 -29.27 odorino sheen W2710 21900 5800 57G 640 2100 <25 <2$ <25 <25 <250 <5000 1900 <25 <25 56.48 -31.06 odor/no sheen 09!06101 8900 2000 500 210 840 <100 no no no no no na no no 58.67 -33.25 odor/no sheen 12104101 28000 6700 1600 910 4000 <250 no no no no no no na no 58.98 -33.56 odorino sheen 03/01/02 57000 12000 1200 1400 6100 <500 no no na no no no na no 57.62 -32.20 odorino sheen 05120102 53000 11000 1500 1300 6200 <50 <50 <50 <50 <500 <5000 <500 <50 <50 57.91 27.44 -30.47 no odor/no sheen 08!30102 51000 9900 3200 1300 6100 <500 no no na no no no na no 60.95 -33.51 odor/no sheen I II { 474gnx00.xla Project No.1474.41 Page 1 of 8 HORIZON ENVIRONMENTAL INC.