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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 ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u !L u !L u IL u IL u 1L u !L u 1L u !L u 1L Wal" L u !L u !L u 1L u IL feet feet ms feet msl Comments MW-12 10!26199 81000 3200 17000 3100 17000 <2.0 <2.0 <2,0 <2,0 <20 <5p 46000 < 1. screened 03103!00 70000 2800 13000 2000 11000 59 <Sp <Sp < 5D 66 53.51 25.79 -27.72 no odor/no sheen Interval 06!22!00 87000 2600 14000 50 <500 <0.50 36000 -200 <50 55.63 -29.84 no odor/no sheen 84'-89' 09/28/00 68000 7500 2400 13000 <20 <20 <20 <20 <200 <2000 39000 30 <20 54.64 3300 2200 7700 -200 na na na na na na na no 56,49 28'85 no odor/no sheen 12/22/00 27000 750 4700 190 5500 -200 no na na na na -30.70 slight odorino sheen 03128/01 67000 2400 no na no 56.32 -30.53 odor I no sheen 11000 2100 12000 <200 no no no no no no no no 55.20 01'127101 9WW 5800 15000 2900 16000 450 <50 <50 <50 <5DO <5000 60000 240 <50 56.45 -29'41 odor/no sheen 09!06/01 80000 7100 9500 2400 13000 <250 no no no no no 30.66 odorino sheen 12/04101 81000 6000 6200 2500 11000 <100 no no na na na na na na 59.38 -32.51 odor lno sheen 03/01/02 69000 5900 5500 2000 9500 4250 no no no na na -33.37 odor!no sheen 05/20102 43000 4700 3700 830 5700 <25 <25 <25 <25 < na na na SS,p3 32.24 odor no sheen 08/30102 38000 4700 3300 860 4500 4200 na na na na <nam 41 a00 440 na a5 68.03 27.75 -30.54 odor 1 no sheen 12!06!02 27000 3400 2600 220 4300 <20 no no no na 33.28 odor!no sheen na na na no 61.51 33.76 odor lno sheen AS-1 10126199 1700 100 7.7 26 27 5.0 <D.50 <0.50 40,50 <5.0 < screened 03103!00 -200 8.0 c 50 200000 5.6 <0.50 60.94 nm nm no odoNno sheen 2.0 3.2 <2.0 11 42.0 <2.0 <2.0 420 -0.50 69000 <2.0 <2.0 55.51 Interval 06!22/00 <200 8.3 2.8 nm no odor/no sheen 70.5-75.5' 09/28100 200 5.3 1 2 3.2 4.2 10 -2.0 42,0 42.0 420 =200 55000 <2.0 42,0 54.84 nm no odorino sheen 1.9 2.1 t0 no no na no no no no no 56,63 12/22100 96 2.0 1.1 <0.50 0.62 32 no na na na na rta na na 56 51 nm no odorino sheen 03l28ro1 1200 70 220 28 120 <10 no no no na na na na na 5$.02 nm no odorino sheen 05/27101 600 21 43 3.4 3,9 7.T -0.50 -0.50 <O.5D 7.6 -54 13000 1.4 <0.50 56.80 nn1 no odor/no sheen 09/06/01 610 19 35 14 32 6.8 n, na 0. na na nm no odorino sheen 12104101 4900 540 350 170 880 425 na na no no no no no no gg.27 68.81 nm no odorino sheen 03/01/02 690 55 33 14 77 5.1 na na na na nm no odor/no sheen 05120/02 2000 140 150 no na no no 58.55 nm no odor/no sheen a3 170 5.0 -0.50 <0.50 <0.50 <5.o <2500 12,D00 1.3 <0.50 58.39 27.93 30,46 no odorino sheen 08130!02 550 21 16 6.5 79 8,0 no no no na 72106!02 no no no no 61.45 9800 2000 13DO 290 1700 <10 no na no no no na na a 61 35 -33.52 no ododno sheen 33.42 odorino sheen vW-1 09/08/98 170000 36000 47000 3300 24000 0.70 <0.50 <0.50 <0.50 <5.0 screened 12/30798 190000 34000 4c9000 3300 24000 c1000 no no no no na no 6.8 na na 58.88 nm m nstrong odor!no sheer ne no no 57.10 Interval 03/25199 260000 37000 55000 4800 32000 <5.0 45.0 -5.0 45.0 450 c nm odor I no sheen 50'-65' 06!03!99 120000 20000 26000 3500 23000 <5.0 <5.0 < 500 <50 na na 55.05 nm no comment 08/30/99 13DOW 25000 46DDO 3900 250DO 450 <50 <50 �5n <50 <5D0 -50 140 520 54.19 i 500 `5000 <500 160 620 56.28 nm no comment 12110/99 200000 22000 35000 3300 23000 <100 -100 <100 <100 -10D0 <10,000 < nm no comment 03/03100 180WO 23DDD 36000 25DO 18000 <100 <100 <100 -too <10DO < 2000 160 590 56.42 nm no comment 06/22/00 190000 23000 39000 3200 22000 < 20,000 -1000 1500 5800 55.63 nm no odorino sheen 09128/00 ns ns loo -100 <100 -100 <1000 <10,000 `1000 130 540 54.16 ns ns ns ns ns ns ns ns nm no odorino sheen 12!22100 190000 29000 42000 29DO 20000 -2000 no no no no na ns ns ns nm nm 03128101 180000 36000 40000 4900 20000 <500 na na na na na na no no 55.82 nm odorino sheen 06127101 190000 28000 40000 3900 24000 <200 < no no na 54.43 nm odor/no sheen 09/06/01 230000 38000 43000 3300 20000 -2000 no <n00 <�a 00 `no -20000 14000 290 730 56.43 na no no no 58.60 nm odor/no sheen 331101 23D000 32000 41000 3500 23000 -7000 na na no no na nm odor/no sheen 03/01/02 230000 28000 37000 3700 24000 <2000 no no na na no 58.91 nm no odor/no sheen 05120/02 220000 32000 41000 3600 23000 -200 <2p0 c200 4200 <na no no no no 57.74 nm slight odor!sheen 08/30/02 200000 31OW 2000 -20000 42000 4200 c200 57.86 27.51 -30.35 no odor/no sheen 31000 2600 17000 -1000 na na na no no no no no 60.90 12106!02 170000 31000 33DDO 2800 1 BOOP <25 no no na na na -33.39 odod slight sheen no no no 61.23 -33.72 odor lno sheen s74gmr00 xfs Projeel NO.1474.44 Page fi of 8 HORIZON ENMONMENTAL INC.