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• . TABLE 1 r GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- totalDepth to TOC GW Well TPI-Ig benzene toluene benzene xylenes 7MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (ug1L) (uglL) (ug1L) g1L) (uglL) (uglL) (ug1L) (ug1L) (ug1L ) {ug/L} {ug/L}(uglL (feet) (feet mel) (feet mel) Comments MW-12 10/26199 81000 3200 17000 3100 17000 <2.0 <2.0 <2.0 <2.0 <20 -50 46000 450 66 53.51 25.79 -27.72 no odor/no sheen screened 03/03/00 70000 2800 13000 2000 11000 59 -50 • 450 450 4500 40.50 36000 <200 450 •55.63 -29.84 no odorino sheen Interval 06/22100 87000 2600 14000 2400 13000 <20 <20 <20 <20 <200 <2000 39000 30 <20 54.64 -28.85 no odorino sheen 84'-89' 09/28/00 68800 7500 3300 2200 7700 <400 no na no no no no na no 56.49 -30.70 slight odo0no sheen 12122100 27000 1 750 4700 190 5500 <200 no no no na no no no na 56,32 -30.53 odor lno sheen 03/28101 67000 2400 11000 2100 12000 <200 no no no no no no na no 55.20 -29.41 odor I no sheen 06!27101 93000 5800 15000 2900 16000 <50 450 <50 <50 4500 <5000 60000 240 <50 56.45 -30.66 odor lno sheen 09/06101 80000 7100 9500 2400 13000 <250 na no na na na no no no 58.30 -32.51 odor lno sheen j1 12/04/01 81000 6000 6200 2500 11000 4100 no no no na no no no no 59.16 -33.37 odor l no sheen 03101!02 69000 59M 5500 20W 9500 <250 no no no na no no no na 58.03 -32.24 odor 1 no sheen 05120/02 43000 4700 3700 830 5700 <25 <25 425 <25 <250 <2500 41,000 440 <25 58.29 27.75 -30.54 odor l no sheen 08130/02 38000 4700 3300 860 4500 4200 na na no no na no no no 61.03 -33.28 odor 1 no sheen AS-1 10/26/99 1700 100 7.7 26 27 5,0 <0.50 <0.50 <0.50 <5.0 <50 200000 i 5.6 <0.50 60.94 nm nm no odor/no sheen screened 03103100 <200 8,0 <2.0 3.2 <2.O 11 <2.0 <2.0 <2.0 420 <0.50 69000 <2.0 -2.0 55.51 nm no odor/no sheen interval 06/22/00 <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 odor/no sheen 70.5.75.5' 09128/00 200 5.3 1.2 1.9 2.1 10 no no no no no no no no 56.63 nm no odortno sheen 12122/00 96 2.0 1.1 <0.50 0.62 32 no no no no no no no no 56.51 nm no odorino sheen 03/28/01 1200 70 220 28 120 <10 no no no no no no na no 56.02 nm no odor/no sheen 06/27/01 600 21 43 3.4 3.9 7.7 <0.50 <0.50 <0,50 7.6 <50 13000 1.4 <0,50 56.80 nm no odor/no sheen 09/06/01 610 19 35 14 32 6.8 no no no no no no no no 58.81 nm no odorino sheen 12/04/01 4900 540 350 170 880 <25 no no na no no no no no 59.27 nm no odorino sheen 03/01/02 690 55 33 14 77 5.1 no no no no na no no- no 58.55 nm no odor/no sheen 05/20102 2000 140 150 43 170 5.0 <0.50 <0.50 <0.50 <5.0 <2500 12,000 1.3 <0.50 58.39 27.93 -30.46 no odor/no sheen 08!30!02 550 21 16 6.5 19 8.0 no no no no na no no no 61.45 -33.52 no odorino sheen VW-1 09/08198 170000 360M 47000 3300 24000 0.70 <0.50 <0.50 <0.5D <5.0 61 6.8 no no 58.88 nm nm strong odor!no sheen screened 12/30/98 190000 34000 49000 3300 24000 <1000 no no no no no no no no 57.10 nm odor Inosheen Interval 03125199 260800 37000 55000 4800 32000 <5.0 <5.0 <5.0 45.0 <50 <500 <50 no no 55.05 nm no comment 60'65' 06!03199 120000 200M 26000 3500 23000 <5.0 <5.0 <5.0 45.0 <50 <500 <50 140 520 54.19 nm no comment 08/30199 130000 25000 46000 3900 25000 -50 <50 450 <50 <500 <5000 4504 160 620 56.28 nm no comment j 12110199 200000 22000 35000 3300 23000 <100 <100 <100 <100 <1000 -10,000 <2Do0 1 160 590 56.42 nm no comment 03103100 180000 23000 36000 2500 18000 <100 4100 <100 4100 <1000 <20,000 -1000 1500 5600 55.63 nm no odorino sheen 06!22100 190000 23000 39WO 3200 22000 <100 <100 <100 <100 <1000 <10,000 <1D00 130 540 54.16 nm no odorino sheen 09128100 ns ns ns ns ns hs ns ns ns ns ns ns ns ns nm nm 12/22100 190000 29000 42000 29DO 20000 <2DDO na na na na no na no na 55.82 nm odor lno sheen 031281D1 18DD00 36000 40000 4900 20000 <500 na na na na no no na no 54.93 nm odor I no sheen 06/27/01 190000 28000 40000 3900 24000 <200 <200 <2DO <200 <2000 -20000 14000 290 730 56.43 nm odor lno sheen 09106101 230000 36000 43000 3300 20000 -42000 no no no no no no no no 58.60 nm odor lno sheen 12/04/01 200000 32000 41000 3500 23000 <1000 na na na na na no na na 58.91 nm no odorino sheen 03/01/02 230000 29000 37000 3700 24000 <2000 no no na no na no no no 57.74 nm slightodor I sheen 05/20/02 22DDDO 32000 41000 3600 23000 4200 <200 <200 <200 <2000 <2D00D <2000 <200 <200 57.86 27.51 -30.35 no odorino sheen 08/30102 200000 310DO 31000 2600 17000 <1D00 no no na no no no no no 60.90 -33.39 odor/slight sheen i 474gmt00 als Project No.1474,44 Page 6 of 8 HORIZON ENVIRONMENTAL INC.