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i 0 { 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 MTBEDIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u !L (ug/L fug/L)( u 1L u IL u ILy (u 1L) ((uq/!- u IL u 1L u IL u 1L (ug/L u !L (feetj ifeet msl feet msf Comments MW-11 10/26795 1600 3.6 0.93 23 1.7 3.1 <0.50 <0,50 <0.50 <5,0 <50 <5,0 24 <0.50 57.72 26.14 -31.58 no odor/no sheen screened 03/03100 300 0,8 <0.50 <0.50 <0.50 1.9 <0.50 <0,50 <0.50 a5.0 <0.50 <5,0 4.9 <0,50 55.64 -29.50 no odor/no sheen interval 06122!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' 50'-70' 09128100 2000 3.8 0.50 29 0.78 <5,0 na na no na no no na Aa 57.21 -31.07 no odorino sheen 12!22100 1100 2.2 <O50 2.2 0.65 <5.0 no no no na na no no no 56.41 -30.27 no odorino sheen 03128!01 1200 0.98 <0.50 8.6 0.62 <5.0 no no no no na no no no 55.66 -29.52 slight odor/no sheen 66/27101 1500 1.3 <050 12 <0,50 10.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 67 <0.50 56.92 -30.78 slightodorl no sheen 09/06101 950 2.6 1.8 8.7 3.9 <5.0 na no na na na na na no 58.98 -32,84 no ododno sheen 12/04101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 03/01/02 770 1.1 1.4 0.55 2.3 <5_G na no na na no no no na 58.29 -32.15 no odor/no sheen 05!20102 1400 <0,50 <0.50 1.5 <0,50 <0.50 <0.50 4050 <0.50 <5.0 <50 <5.0 59 10.50 58.57 28.10 -30.47 no odorinosbeen MW-12 10/26/99 81000 3200 17000 3100 17DGD <2.0 <2.0 <2.0 <2.0 <20 <50 46000 <50 66 53.51 25.79 -27.72 no odorino sheen screened 03103700 70000 2800 13000 2000 11000 59 <50 <5o <50 <500 <0.50 36000 <2DD <50 55.63 -29.84 no odorino sheen interval 06/22/00 87000 2600 14000 2400 13DDD <20 <20 <20 <20 <200 <2000 39000 30 <20 54,64 -28.85 no odorino sheen 84'449' 09128!00 68000 7500 3300 2200 7700 <200 no na na na no na no no 56,49 -30.70 slight odor/no sheen 12122/00 27000 750 47DD 190 55DO <200 na no no na no no na no 56,32 -30.53 odor lno sheen 03/28/01 67000 2400 11D00 2100 12000 <200 na no na no no na na no 55.20 -29.41 odor lno sheen 06/27/01 93D00 5800 15D00 2900 16000 <50 <50 <60 <50 <500 <5000 60000 240 <50 56,45 -30.66 odor 1 no sheen 0910610180DW 7100 9500 2400 13GW <250 no no no no no na na no 58.30 -32.51 odor lno sheen 12/04/01 81000 6000 6200 2500 11000 <1D0 no no na no no no no no 59.16 -33.37 odor lno sheen 03101/02 69000 5900 5500 2000 9500 <250 na no no no no na no na 58.03 -32.24 odor lno sheen 0W201D2 43000 4700 3700 830 5700 <25 <25 <25 <25 <250 <2500 41,D00 440 c25 58.29 27,75 -30.54 odor Inosheen AS-1 10/26/99 1700 100 7.7 26 27 5,0 <0.50 <0.50 <050 <5.0 <50 200000 5.6 <0.50 60.94 nm nm no odor/no sheen screened 03103100 <200 8.0 <2.0 3.2 <2a 11 <2,0 <2.0 4.0 120 <0.50 69DDO <20 <2.0 55.51 nm no odor/no sheen interval 06122100 <200 8.3 2.8 3.2 4.2 10 <2,0 <2.0 <2.0 <20 <200 55000 <2.0 <2.0 54,84 nm no odorino sheen 70.5.75.5' 0928700 2D0 5.3 1.2 1.9 2.1 10 no no no na no no na na 56,63 nm no odorino sheen 1222109 96 2.0 1.1 <0.50 0.62 32 no no na no no na na no 56.51 nm no odorino sheen 03128/01 1200 70 220 28 12D <10 na no no no no no no no 56.02 nm no odorino sheen 06127/01 600 21 43 3.4 3,9 7.7 <0.5D <0.50 <0.50 7.6 <50 13000 1.q <0,50 56.80 nm no odorino sheen 09!06!01 610 19 35 14 32 6.8 no no no na no na no na 58,81 nm no odorino sheen 12104/01 4900 540 350 170 880 <25 no no na no no na na no 59.27 nm no odorino sheen 03101102 690 55 33 14 77 5.1 no no na na na na no no 58,55 nm no odorino sheen 05120102 2DD0 140 150 43 170 5.0 <0,50 <0.50 <0.50 <5.0 <25D0 12,000 1.3 <0.50 58.39 27.93 -30.46 no odor/no sheen 4 h I I� f 474q.,00 As Project N.1474 44 Page 5 of 7 HORIZON ZNVIRONMENTAL INC.