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M <br /> • i <br /> • <br /> TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> Beacon Station No.12474 <br /> 3440 East Main Street,Stockton,California <br /> ethyl- total Depth to TOC GW <br /> Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDS GW Elevation Elevation <br /> Number Date (ug/L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ugfL) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L)(ug1L (feet) (feet msl) (feet msi) Comments <br /> Mw-7 03/31/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 1 na na na na na na na na 61.75 25.66 -36.09 <br /> screened 06110!98 <50 .<0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 59.04 33.38 no odor!no sheen <br /> Interval 09108!98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 .40.50 <5.0 <50 45.0 na na 59.19 -33.53 no odor I no sheen <br /> 56'-76' 12130!98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 57.18 -31.52 no odor!no sheen <br /> 03125!99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 =5.0 <50 <5.0 na na 55.07 -29.41 no comment <br /> 06103!99 <50 <0.50 <O.SO <0.50 <0.50 <0.50 <0.50 <0.50 <0-50 <5.0 <50 <50 5.6 .40.50 54.61 -28.95 no comment <br /> 08130/99 <50 <0,50 .40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 2.1 <0.50 56.85 -31.19 no comment <br /> 12!10!99 <50 .40.50 .40.50 .40.50 .40.50 0.50 .40.50 <0.50 <0.50 <5.0 <50 <5.0 4.7 <0.50 56.68 31.02 no comment <br /> 03103!00 <50 .40.50 .40.50 .40.50 .40.50 0.62 .40,50 .40.50 .40.50 <S.p =50 <5.0 5.0 =0.50 55.61 -29.95 no odortno sheen <br /> 06126!00 <50 =0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 9.4 4.0 <0.50 54.62 -28.96 no ododno sheen <br /> 09/28/00 <50 <0.50 -0.50 <0.50 -0.50 <5.0 na na na na na na na na 56.93 -31.27 no odorino sheen <br /> 10120100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 24.73 nm wellhead re-surveyed <br /> 12/22!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm no odor/no sheen <br /> 03128/01 73 6.2 17 1.5 7.5 <5.0 ns ns ns ns ns ns ns ns 54.73 -30.00 no odorino sheen <br /> 06/27/01 <50 <0.50 1.0 <0.50 <0.50 0.87 <0.50 <0.50 .40.50 <5.0 <50 <5.0 6.0 .40.50 55.99 -31.26 no odor/no sheen <br /> 09/06101 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 58,03 -33.30 no odor/no sheen <br /> 12103101 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 58.41 .33.68 no odorino sheen <br /> 02/28!02 <50 <0.50 <0.50 <050 <0.50 <5,0 na na na na na na na na 57.13 -32.40 no odor/no sheen <br /> 05!20102 51 <0.50 1.9 <0.50 <0.50 0.92 <0.50 <0.50 <0.50 <5.0 <50 <5.0 15 <0.50 57.55 26,94 -30.61 no odor/no sheen <br /> 08129!02 <50 =0.50 <0.50 =0.50 <0.50 <5.0 na na na na na no na na 60.63 •33.69 no odor/no sheen <br /> MW-8 03/31198 100 <0.50 <0.50 <0.50 <0.50 1 <5.0 na na na na na na na na 61.51 25.68 -35.83 reported as MW-3A <br /> screened 06110!98 80 0.9 =0.50 <0.50 =0.50 <5.0 na na na na na na na- na 58.86 -33.18 reported as MW-3A <br /> Interval 09108/98 79 0.57 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <5.0 <50 <5.0 na na 58.97 -33,29 slight odor 1 no sheen <br /> 56'-76' 12/30/98 51 2.4 0.69 <0,50 <0.50 <5,0 na na na na na na na na 57.13 -31.45 slight odor I no sheen <br /> 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 na na 55.09 -29.41 no comment <br /> 06/03/99 <50 <0.50 <0.50 <050 .40.50 <0.50 <0.50 .40.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 54.42 -28.74 no comment <br /> 08!30199 <60 0.67 <0.50 -0.50 -0.50 =0,50 <0.50 <0,50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.60 -30.92 no comment <br /> 12!10199 330 -0.50 <0.50 -0.50 .40.50 <0.50 <0,50 -0.50 <0.50 5.1 <50 <10 0.51 .40.50 56.57 -30.89 no comment <br /> 03/03/00 <50 <0.50 <0.50 <0.50 .40.50 <0.50 <0.50 <0.50 <0,50 <5.0 <50 <5L <0.50 <0.50 55.28 -29,60 no odor/no sheen <br /> 06!22100 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 12 0.63 .40.50 54.37 -28.69 no odorino sheen <br /> 09/28/00 <50 .40.50 .40.50 .40.50 <0.50 <5.0 na na na na na na na na 56.75 -31.07 no odor/no sheen <br /> 12!21100 <50 <0.50 <0.50 <0.50 <0,50 <5.0 na na na na na na na na 55.92 30.24 no odor/no sheen <br /> 03128MI <50 <0.50 1.4 <0.50 1.1 <5.0 na na na na na na na na 54.98 -29,30 no odortno sheen <br /> 06127!01 <50 .40.50 .40.50 c0.5D U. <0.50 .40.50 .40.50 .40.50 7,6 <50 <5.0 .40.50 .40.50 56.57 -30.89 no odorino sheen <br /> 09!06!01 <50 <0.50 <0.50 <0.50 .40.50 <5.0 na na na na na na na na 58.46 -32.78 no odor/no sheen <br /> 12!03101 130 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 59.02 -33.34 no odor/no sheen <br /> 02/28/02 85 <0.50 .40.50 .40.50 .40.50 <5.0 na na na na na na na na 57.85 32.17 no odorino sheen <br /> 05120102 140 .40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 58.11 27.64 -30.47 no odorino sheen <br /> 08129!02 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 61.14 -33.50 no odor/no sheen i <br /> I <br /> 474gmr00.ds <br /> Project No.1474.44 Page 4 of 8 HORIZON ENVIRONMENTAL INC. <br />