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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 TPH9 benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Nutttb2tr Date u IL WWI-) u 11 u fL u 1L u 1L u 1L u 1L u 1L u 1L u 1L u 1L u 1L u !L feet feet msl feet msl Comments MW-12 10126199 81000 3200 17000 3100 17000 4.0 <2,0 <2.0 <2.0 <20 <50 46000 < screened 03103100 70000 2800 13000 2000 11000 59 <50 <50 a 50 66, 53.51 25.79 -27.72 no odor/no sheen 50 <500 <0.50 36000 <200 <50 55.63 -29.84 no odor/no sheen interval 06!22!00 87000 2600 14000 2400 13000 <20 <20 <20 <20 <200 <2000 39000 30 <20 54.64 84'-89' 09!28100 68000 7500 3300 2200 7700 <200 no no no no na na -28'85 no odor/no sheen na na 56.49 12/22/00 27000 750 4700 190 5500 <200 no no na no no no -30.70 slight odorino sheen 03126/01 67000 2400 11000 2100 12000 <200 no na no no na na na 56.32 -30.53 odor/no sheen 06/27/01 93000 5800 15000 2900 16000 <50 <54 e50 '50 <500 < na no no 55,20 -29.41 dor I no sheen 5000 60000 244 e50 56.45 -30.66 odor!no sheen 09706/01 80000 7100 9500 2400 13000 <250 no na no na na na na na 58.30 12/04701 81000 6000 6200 2500 11000 <100 na na na na na no no na 59.16 -32.51 dorino sheen 03101/02 69000 5900 5500 2000 9500 <250 no na no no na no -33.37 odorino sheen 05/20102 43000 4700 3700 830 5700 <25 na na 58.03 -32.24 odorino sheen <25 <25 <25 '250 <2500 41,000 440 <25 58.29 27.75 -30.54 odor I no sheen 08130/02 38000 4700 3300 860 4500 <200 na no na na no na no na 61.03 12106/02 27000 3400 2600 220 4300 <20 no na na na na no -33.28 odor lno sheen 03!07!03 54000 6200 4800 940 8400 <250 na no na na no no na na 61.51 -33.76 odorino sheen 06!03103 28000 2800 2200 57 4440 <10 <10 <1 < na na 60.93 -33,28 odorino sheen 0 10 <700 '1000 <600 <70 <10 59.99 -32.24 otlor!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 5.-6 <O 50 60.94 nm screened 03/03100 <200 8.0 <2.0 3.2 <2.0 11 <2.0 <2.0 <2.0 <20 <0.50 69000 <2.0 <2.0 55.51 nm no odorino 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' 09128100 200 5.3 1.2 1.9 2,1 10 no na no no na nm no odor/no sheen na nna 56.63 nm no odorino sheen 2!00 96 2.D 1.1 <0.50 0.62 32 no na no no na na no na 56.51 03/28/01 1200 70 220 28 120 <10 no no no na no no na nm no odorino screen 06/27/01 600 21 43 3.4 3.9 7,7 < na 56.02 nm no dor/no sheen 0.50 <O.SD <0.50 7.6 <50 13000 1.4 '0.50 56.80 nm no dorino sheen 09106/01 610 19 35 14 32 6.8 no no no na na no na no 58.27 81 12/04101 4900 5na n 40 350 170 880 <25 na na no no na na nm no Gdoor/no orino sheen o . nm no odnm no orino sheen 11 690 55 33 14 77 5.1 no no na no no no na na 58.55 05120!02 2000 140 150 43 170 5.0 <0.50 <0.50 <0.50 <5.o <2500 12,000 1.3 <0,50 58.39 27,93 -30.46 no dorino sheen 08!30102 550 21 16 6.5 19 8.0 no no no na no na na no 61.45 12!06102 9800 2000 1300 290 1700 <10 na no no no no no -33.52 no odorino sheen na no 61.35 -33.42 dorino sheen !03 4700 720 430 110 550 <25 na no na no no no na na 64.81 06/03/03 2600 460 280 67 350 4.6 <2.0 <2.0 <2.0 <20 <200 -32.88 odor/no sheen 4,000 <2.0 <2.0 59.73 -31.80 odor/no sheen VW-1 09!08!98 170000 36000 47000 3300 24000 0,7U 0.50 <D.50 <0.50 <5.0 61 6.8 na screened 12/30/98 190000 34000 49000 3300 2400❑ <10, no no no na na 58.88 nm nm strong odor I no sheen interval 03125/99 260000 37000 55000 4800 32000 n e ❑ < no na no na 57.10 nm odor lno sheen 5. 5.0 <50 <500 <50 no no 55.05 50'-65' 06103199 120000 20000 26000 3500 23000 <8 <5.0 `5.0 <50 <500 nm no comment 08734199 130000 25000 46000 3900 25000 `50 140 520 54.19 nm no comment `' <5U <50 -500 <5000 '500 160 620 56.28 12!10199 200000 22000 35000 3300 23000 <t� <100 <100 1000 <10,000 <2000 160 590 nm no comment 03!03!00 180000 23000 36000 2500 18000 <� do <100 <10U 1000 <20.000 <1000 1500 5800 55,63 nm no comment 06722700 190000 23000 39000 3200 22000 ! nm no odor/no sheen 00 <to0 <10r -000 <10,000 '1000 130 540 54.16 09/28/00 ns ns ns ns Its ns ns ns ns ns nm no ador7no sheen 12122/00 190000 29000 42000 2900 20000 <_ ns ns nm nm na na no na no 03128/01 180000 36000 40000 4900 20000 r. no na Ila na no na na na no 55.82 nm dorino sheen 06/27101 190000 28000 40000 3900 24000 <2t -200 < 54.93 nm odor lno sheen 20 <2o <20000 54000 290 7 56.43 nm odorino sheen 09706/01 230000 36000 43000 3300 20000 <200, no na na no no no no 58.60 12/04/01 200000 32000 41000 3500 23000 <1r no na an58.91 nm no odorno s na nm dor!/n sheen 03/01/02 230000 29000 37000 3700 24000 no no n. na o o sheen <20000 < 57.74 nm slight odor 1 sheen 05/20/02 220000 32000 41000 3600 23000 � ❑ <200 <20 20' <200 57.86 08730/02 200000 31000 31000 2600 17000 < , na no a na n 27.51 -30.35 no odor/no sheen no 60.90 -33.39 odor/ 12/06/02 170000 31000 33000 2800 18000 <25 no na na na 03107703 210000 35000 46000 3300 7.1000 <2000 na no na no 61.23 -33.72 Odor lno sheen 06103/03 220000 37000 46000 3500 22000 <100 <100 '1000 <1D0U0 oa no 60.21 -32.70 Odor fno sheen 394 600 59.21 -31.70 odor/no sheen 474gmteU.K1s Project No,1474 44 Page 6 of 8 HORIZON XNVIRONUBUTAL INC.