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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPI-Ig benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L) (uglL) (ug1L) (u 1L) (ug/L) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet msl) (feet msl) Comments MW-1 03/31/98 96 <0.50 <0.50 <0.50 <0.50 <5.0 na na -775-na na na 62.27 26.29 -39.98 screened 06110198 ns. ns ns ns ns ns ns ns ns ns ns ns 59.59 -33.30 1 no comment Interval 09108198 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 57.70 -31.41 no comment 03/25/99 <5D <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 06/03/99 <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 55.13 -28.84 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 <0.50 <0.50 57.38 -31.09 no comment 12110/99 <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 57.18 -30.89 no comment 03103100 94 <0.50 <0.50 <0,So <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/no 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 odorino sheen 09/28/00 240 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 57.43 31.14 no odorno sheen 12/22106 180 x0.50 <0.50 <0.50 c0.50 <5.0 na na na na na na na na 56.58 -30.27 no odor/no sheen 03128/01 180 <0.50 1.5 <0.50 1.2 <5.0 na na na na na na na na 55.61 -29.32 no odorino sheen MW-2 1 T203/25/991600 1100 86 71 270 <25.0 na na na na na na 61.45 25.42 36.03 screened ns ns ns ns ns ns ns ns ns ns ns 58.76 33.34 no Comment Interval ns ns ns ns ns ns ns ns ns ns ns 58.82 -33.40 no comment 76'-91.5' ns ns ns ns ns ns ns ns ns ns ns ! 130 1.7 1.1 50 0.62 <0,50 <0.50 <0.50 6.1 <50 25 56.83 -31.41 no comment 54.90 -29.48 no comment 06103199 14,01)0 8300 730 510 2100 <0,50 <0.50 <0.50 <0.50 <5.0 c50 <5.0 26 0.72 54.27 -28.85 no comment 08/30/99 42,000 8900 5000 1200 5800 0.62 2.0 <0.50 <o.SO <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.a <5.0 <50 <50 <100 <5.0 <5.D 56.33 -30.91 no comment 03/03/00 5100 1800 33 160 62 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 <5.0 <5.0 54.91 -29.49 no odor/no sheen 06/22/00 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 odor/no sheen 09128/00 16,000 4100 800 260 1500 <50 na na na na na na na na 56.55 -31.13 slight odor/no 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 03/28101 31000 7600 610 1000 3300 <200 na na na na na na na na 54.69 29.27 odorino sheen MW-3 03/31/98 72 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na screened 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns 61.53 25.54 35.99 Interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.85 -33.31 no comment 73'-90' 12130/96 ns ns ns ns ns ns rts ns ns ns ns ns 58,94 33.40 no comment 56.96 -31.42 no comment 03/25/99 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!03199 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 12110199 51 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 60 <0.50 56.47 30.93 no comment 03!03100 <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 06122100 <50 <0.50 <0.50 <0.50 <0.50 <O.SD <0.50 <O.Sp <0.50 <S.D <50 21 18 <0.50 54.32 -29.85 no odor/no sheen 28.78 no odorino sheen 09/28100 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.71 -31.17 no odor/no sheen 12/21/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 55.77 -30.23 no odor/no sheen 03/28/01 <50 <0.50 0.55 <0.50 <0.50 <5.0 na na na na na na na na 54.85 -29.31 no odor/no sheen I I 474gmr00.xls Project No.1474.44 Page 1 of 5 HORIZON ENVIRONMENTAL INC.