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i • • R 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 ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ugfL) (uglL) (uglL) (ugfL) (ugfL) (uglL) (ug1L) (ugll-) (ug1L) jug/L) (ug1L) (ug1L) (ug1L)(ug1L (feet) (feet msi) (feet msq Comments MW-11 1026199 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 odorino sheen screened 03103/00 300 0.8 <0.50 <O 50 <0.50 1.9 c0.50 <0.50 < bO <5,0 <0.50 <5.0 4.9 <0.50 55.54 -29.50 no odorino sheen Interval 0622!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' s0'-70' 0928M 2000 3.8 0,50 29 0.78 <5.0 no no no no no no no no 57.21 -31.07 no odor/no sheen 12!22(00 1100 2.2 <0.50 2.2 0.65 <5.0 no no no no no no no no 5641 -30.27 no odor/no sheen 0326!01 1200 0.98 <0,50 8.6 0.62 <5.0 no no no no no no no no SSW -29.52 slight odor/no sheen 06/27101 1500 1.3 <0.50 12 <0.50 <050 <0.50 <0.50 <0-50 <5-0 <50 4.0 67 <0.50 56.92 -30.78 slight odor)no sheen 09!06/01 950 2.8 1.8 8.7 3.9 <5.0 na no no no no no no no 58,98 -32.84 no odorino sheen 1204)01 ns ns ns ns ns ns no ns ns ns ns ns ns ns dry dry dry 03/01302 770 1.1 1.4 0.55 2.3 45,0 no no no no no no no no 56.29 •32.15 no odorino sheen 0520102 1400 <0.50 <0.50 1.5 <0.50 <050 <0.50 <0-50 <0,50 <5.0 <50 <5.0 59 <4.50 58.57 28.10 .3047 no odorino sheen 08410102 1400 9.71 <0.50 1.4 <0,50 <5.0 no no no no no no no no 61.58 -33.46 slight odor)no sheen 12!08102 1300 038 <0,50 0-50 <0.50 <0.50 no no no no no no no no 61.80 -33.70 no odorino sheen 0=7103 1000 <0,50 <0.50 <0.50 <0.50 <5.0 no he no no no no na no 61.28 -33.18 no odorino sheen 96103103 1200 <0,50 <0.54 <0.50 <0.60 <0.50 <0.50 <0.50 <0.60 <5.0 <60 <5.0 82 <0.50 80.07 -31.93 no odor/na sheen 9629103 1200 <O So <0.50 <0.50 <0.50 <5.0 no no no no no no no no 62.02 -33.92 no ododno sheen 11(25!03 1500 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no no 62.85 -34,75 no odorino sheen MW-112 10/26199 81000 3200 17000 3100 17000 <2.0 <2,0 <2.0 <2.0 <20 <50 46000 <50 66 53.51 25.79 -27.72 no odorino sheen screened 03!03!00 70000 2800 13000 2000 11000 59 <50 <50 <50 <500 <0.60 36000 <200 <50 5563 -29,84 no odordno sheen Interval 06/22= 87000 2600 14000 2400 13000 QD <20 d0 <20 <2D0 <2000 39000 3D <20 54.64 -28.85 no odorino sheen 84'-89' 0928100 68000 7500 3300 2200 7700 <200 no no no no no no no na 56.49 -30.70 slight odorino sheen 12122MO 27000 750 4700 190 5500 <200 no no no no no no no no 56.32 -30.53 odor)no sheen 0328101 670W 2400 11000 2100 12000 <200 no no no no na no no no 55.20 -29.41 odor fnosheen 0627!01 93DDO 5800 15000 2900 16000 <50 <50 <50 <50 <500 <50DO 60000 240 <50 5645 -30.66 odor Inosheen 09/08/01 80000 7100 9500 2400 13000 <250 no no no no no no no no 5030 -32.51 odor lno sheen 12/04/01 81000 6000 6200 2500 11000 <100 no no na no no no no no 59.16 -33.37 odor Inosheen 03101!02 6900D 5900 5500 2000 9500 <250 no no no no no no no no 58.03 -32.24 odor lno sheen 0520!02 43000 4700 3700 830 5700 <25 <25 <25 <25 450 <2500 41,000 440 <25 58.29 27.75 -30.54 odor lno sheen 08/30/02 38000 4700 3300 860 4500 <200 no no na no no no no no 6t.03 -33.28 odor/no sheen 12706/02 27000 3400 2600 220 4300 <20 no no no no no no no no 61.51 •33.76 odor lno sheen 03107;03 54000 62DO 4800 940 8400 Q50 no no no no no na no no 60.93 -33.18 odor I no sheen OW3103 28000 2800 2200 57 4400 <10 <10 c10 <10 <100 <10DD <60D <10 <1D 59.99 -32.24 odor lno sheen 0829103 76000 4300 3600 2900 10000 <100 no na no no no no no no 61.42 -33.67 n0 odorino sheen 1125103 ns no ns ns ns ns ns ns ns ns ns ns ns ns 62.48 -34.73 not sampled AS-1 1026199 1700 100 7.7 26 27 5.D <D.50 <0.50 <0.50 <5.0 <50 200000 5.6 <0,50 60.94 nm nm no odarino sheen screened 03143100 <200 8.0 <2.0 3.2 <2.0 11 <2.0 <2.0 <2.0 <20 <O50 69M <2.0 <2.0 55.51 nm n0 odorino sheen Interval 06122M <200 6,3 2.8 3.2 4.2 10 Q.0 <2.0 <2.0 <20 Q00 55000 <2.0 Q.0 54.84 nm no odorinD sheen 70.575.5' 09118100 200 5.3 1.2 1.9 2.1 10 no na no no no no no no 56.63 nm no odor/no sheen 12122ND 96 2.0 1.1 <D50 0-62 32 na he no no no no no no 56.51 nm no odor/no sheen 0328101 1200 70 220 28 120 <10 no no no no no no no na 56.02 nm no odwino sheen 0827101 600 21 43 3.4 3.9 7.7 <0.50 <D.50 <0.50 76 <50 13000 1.4 <0.50 56.80 nm no odorino sheen 05106107 614 18 35 14 32 8-8 no no no no no no no no 58.81 nm no odor/no sheen 12ID4101 4900 540 350 170 880 <25 no no no no no na no no 59.27 nm no odorino sheen 03/01102 890 55 33 14 77 51 no no no no no no no no 58.55 nm no odor/no sheen 05!20!02 2000 140 150 43 170 5.D <0.50 <0.50 <0,50 <5,0 <2500 12,000 1.3 <0.5o 58.39 27.93 -30.46 no odor/no sheen 08130102 550 21 16 6.5 19 8,0 no no no no no na no no 61.45 -33.52 no odor/no sheen MID= 9600 2000 1300 29D 1700 <10 no no na na na no na na 61.35 -33.42 odWno sheen 03107103 4700 720 430 110 550 <25 na no no no no no no no 60.81 -32.88 odorino sheen 06/03/03 2600 460 280 67 350 46 <2.0 <2.0 <ZO <20 <200 4,000 Q 8 4.0 59.73 -31,80 odor/no sheen 0829103 <250 8.8 5.8 <2.5 3.7 <25 no no no no no no no no 61.83 -33.90 r13 odorino sheen 1125106 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.61 -34.68 not sampled 474amroe:1s Project No.1474.44 Page 6 of 9 HORIZON ENVIROXNIZNTAL INC.