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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 TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (uglL) (uglL) (uglL) (uglL) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (ug1L) (ug1L) (uglL) (uglL)(uglL (feet) (feet msl) (feet msl) Comments MW-12 1026199 81000 3200 17000 3100 17000 12.0 <2 0 12.-012 0 <20 150 46000 150 66 53.51 25.79 -27.72 no odor/no sheen screened 03103!00 70000 2800 13000 2000 11000 59 <50 150 150 1500 <0.50 36000 1200 150 55.63 -29.84 no odor/no sheen Interval 06122100 87000 2600 1400D 2400 13000 <20 120 -20 '20 <200 '2000 39000 30 -20 54.64 -28.85 no odorino sheen 84'-89' 09128100 68000 7500 3300 2200 7700 1200 no no no no no na no na 56.49 -3070 slight odorino sheen 12/22100 27000 750 4700 190 5500 400 no na no no na no no no 56,32 -30.53 odor lno sheen 0328101 67000 2400 11000 2100 12000 <2D0 no ra no no no no no na 55.20 -29.41 odor lno sheen 0627101 93000 5800 15000 2900 16000 <50 150 150 150 1500 '5040 60000 240 <50 56.45 -30.66 odor lnosheen 09106!01 80000 7100 9500 2400 13DW '250 no no na no no na no no 58.30 -32.51 odor lno sheen 12104/01 81000 6000 6200 2500 11000 <100 no no no no no no no no 59.16 -33,37 odor/nosheen 03M1/02 69000 5900 5500 2000 9500 450 no no no no na no no no 58.03 -32.24 odor lno sheen 0520102 43000 47GD 3700 83D 5700 125 125 25 125 450 <2500 41,000 440 45 58.29 27,75 -30.54 odor lnosheen 08130/02 38000 4700 3300 860 4500 <2DO na no na na no no no na 61.03 -33.28 odor lnosheen 121WI02 27000 3400 2600 220 4300 40 na no no no no na no no 61,51 -33.76 odorino sheen 03107103 54OW 6200 4800 940 8400 '250 no no no na no no no no 60.93 -33.18 odor lno sheen 06103/03 28000 2800 2200 57 4400 110 110 -14 110 '100 '1000 '600 110 110 59.99 -32.24 odor lno sheen 0829103 760W 4300 36W 2000 10000 <10D na no na no no no no no 61.42 -33.67 no odorino sheen AS-1 10/26/99 1700 100 7.7 26 27 5.0 '0,50 '0.50 '0.50 15,0 '50 200000 5.6 <0.50 60,94 nm nm noodorinosheen screened 03/03/00 <2C0 8.0 4.0 3.2 120 11 <2.0 4.0 12.0 <20 '0.50 69000 12.0 <2,0 55.51 nm no Odorino sheen Interval 06122/00 <2GO 8.3 2.8 3.2 4.2 10 12,0 12,0 -2.0 120 '200 55000 12.0 -2.0 54.64 nm no odorino sheen 70.5-75.5' 0926100 200 5.3 12 1.9 2.1 10 no ra no no no no no no 56.63 nm no odor/no sheen 12!22100 96 2.0 1.1 10.50 062 32 na na no no no na na no 56.51 nm no odorino sheen 03128101 1200 7D 220 28 120 110 no no no no no no no na 56.02 nm no odor/no sheen 06127101 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 odorino sheen 09/06/01 610 19 35 14 32 6.8 no no no no no na no no 58.81 nm no odarfio sheen 12/04/01 4900 540 350 170 860 125 no no no no no no no no 59.27 nm no odor/no sheen 03101102 690 55 33 14 77 5.1 no no na no no no no no 58.55 nm no odorino sheen 05120102 2000 140 150 43 170 5.0 '0.50 '0.50 '0.50 <5.0 4500 12,000 1.3 <0 50 58.39 27 g3 -30.46 no odorino sheen 08130102 550 21 16 6.5 19 8.0 no no no no no na na no 61.45 -33.52 no odor/no sheen 12MG102 9800 2000 1300 290 1700 110 no no no na no no no no 61.35 -33.42 odorinosheen 03!07/03 4700 720 430 110 550 <25 na no na no no na no no 60.81 -32,68 odorinosheen 06103!03 2600 460 280 67 350 4.6 4.0 4.0 12.0 20 400 4,000 4.0 <2.0 59.73 -31.80 odorino sheen 08129103 <250 8.8 5.8 12.5 3.7 125 no no no no no na no no 61.83 33.90 no odor/no sheen VW-1 09108/98 170000 36000 47000 3300 24000 0.70 10.50 'D.50 '0.50 15.0 61 6.8 na na 58.88 nm nm trongodor lnosheen Screened 12130/98 190000 34000 49000 3300 240W '1000 no no no no no no na no 57.10 nm odor lno sheen Interval 0325199 260000 37000 55000 4800 32000 15,0 '5.0 15.0 15.0 '50 <500 -50 no no 55.05 nm no comment 60'-65' 06103/99 120000 20000 26000 3500 23000 15,0 '5.0 -5.0 '5.0 '50 '500 150 140 520 54.19 nm no comment OWD199 130000 25000 46000 3900 25000 '50 -50 '50 <50 '500 '5000 1500 160 620 56.28 nm no comment 12/14199 200000 22D00 35000 3300 23000 '100 000 '100 '100 '1000 '10,000 '2000 160 590 56.42 nm no comment 03103/00 180000 23000 36400 25DO 18000 -100 000 <100 -100 '1000 <20,000 '1000 1500 5800 5563 nm no odorino sheen 0622100 190000 230W 39000 3200 22000 '100 <100 <100 '100 '1000 <10.000 11000 130 540 54,16 09nm noodorfiosheen 28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 1222MO 190000 29000 42000 2900 20000 '2000 no no no no no no na no 55.82 nm odor lnosheen 0328101 180000 36000 40000 4900 20000 '500 no na na no no no no na 54.93 nm odor lno sheen 0627101 190000 28000 40000 3900 24000 -200 1200 <200 400 <2000 40000 14000 290 730 56.43 nm odor lnosheen 09106/01 230000 36000 43000 3300 20000 <2000 no no no no na na no no 58.60 nm odor lnosheen 121041D1 200000 32000 41000 3500 23000 0D00 no na no no no no no no 58.91 nm no Oderinosheen 03101/02 234000 29DDO 37000 3700 240W <2000 no na no na na no na no 57.74 nm slight odor I sheen 0520102 220000 32000 41000 3600 23000 '200 1200 -200 '200 2000 '20000 '2000 '200 <2GO 57.66 27.51 -30.35 noadorfiosheen 08/30/02 200000 31000 31000 2600 170GO '1000 no no no no no no na na W.90 33.39 odor/slight sheen 12106102 170000 31000 33000 2800 18000 <25 no na na na na na na na 61.23 -3372 odor lno sheen 03/07/03 210000 35000 46000 3300 21000 '2000 no na no no no no no na 60.21 -32.70 odor lnosheen 06103/03 220000 37000 48400 3500 22004 '100 '100 '100 '100 -1000 '10000 '1000 390 600 59,21 -31.70 odor lno sheen 0829103 230Wo 35000 33000 3100 21000 '1000 na na na no no na no na 61.30 -33.79 no odorino sheen 474gmra0,Is N. 1.74 44 Pages of 8 HORIZON ENVIRONMENTAL INC.