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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 jMT�BEDIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u 1L u 1L u 1L u 1L a 1L u 1L u 1L u 1L u IL u 1L u 1L u 1L u !L feet feet msl feet msl Comments MW-5 03/31/98 <50 <0.50 <0.50 <0,50 <0.50 <5.0 nano no no no no no no 64.11 25.11 -36.00 screened 06/10/98 <50 10.50 -40,50 <0.50 <0.50 <5.0 no no no no na no na no 58,41 -33.30 no odor f no sheen Interval 09/08/98 750 -40.50 -46.50 <0,50 <0.50 -40.50 -40.50 <0.50 -40.50 75.0 <50 <5.0 no no 58.41 -33.30 no odor no sheen 65'-86.5' 12/30198 <50 <0.50 2.5 0.89 5.8 <5.0 no no no no no no no no 56.51 -31.40 no odor lno sheen 03125/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <5.0 <50 <5.0 no no 54.54 -29.43 no comment 06103/99 750 <0.50 -40.50 -40.50 -40.50 =0.50 -40.50 -40.50 <0.50 <5.0 <50 <5.0 1 <0.50 <0.50 53.89 -28.78 no comment 08/3DI99 95 1.7 7.4 2.1 15 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.04 -30.93 no comment 12/10/99 750 <0.50 <0.50 <0.50 <0.50 <0.50 -40.50 <0.50 <0.50 <5.0 <60 <5.0 <0.50 <0.50 55.99 -30.88 no comment 03/03100 <50 <0.50 0.51 <0.50 0.92 <0.50 <0.50 <0.50 <0.50 <5.0 <50 6.0 <0.50 <0.50 54.53 -29.42 no odorino sheen 06/22/00 <50 <0.50 -40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 24 -40.50 -40.50 53.75 28.64 no odorina sheen 09/28100 <50 <0.50 -40.50 <0.50 -40.50 75.0 no no na no no no na no 56.19 -31.08 no odor/no sheen 12/21/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 55.32 -30.24 no odorino sheen 03/28/01 78 2.5 14 2.1 11 <5.0 no no no na no no no no 54.44 -29.33 no odor/no sheen 06/27/01 <50 <0.50 0.68 <0.50 <0.50 <0 50 <0.50 <0.50 -40.50 <s.o 750 75.0 -0.50 <0.50 55.89 30.78 no adodno sheen 09/06/01 <10 0.64 1.1 0.70 2.0 <5.0 no n2 no no no no no no 57.96 -32.85 no odor/no sheen 12/03/01 <50 <0.50 1.1 <0.50 <0.50 <5.0 no no no no no no no no 58.45 -33.34 no odor/no sheen 02128!02 <50 <0.50 0.55 <0.50 -40.50 <5,0 no no no no no na na no 57.31 -32.20 no odorino sheen 05120/02 220 11 14 6.4 31 <0.50 <0.50 <0.50 <0.50 <5,0 <50 <5.0 <0.50 <050 57.53 27.10 -30.43 no odorino sheen 08/29/02 <50 -40.50 <0.50 <0.50 0.56 <5.0 no no no no na no no no 60.53 -33.43 no odor/no sheen 12106/02 <50 0.73 1.7 <0.50 1.5 <0.50 no no no no na no no no 60.71 -33,61 no odor/na sheen MW-6 03/31198 78000 23000 8500 1100 63M 7500 no no no no na no no no 61.43 25.44 -35.99 1 reported as MW-2A screened 06/10/98 120000 23000 17000 1600 15000 -4500 no no no no no no no na b8.69 -3325 reported as MW-2A interval 09/08/98 120000 30000 2DD00 2300 18000 -40.50 -40.50 -40.50 <0.50 <5.0 <50 <5.0 no na 58.77 -33.33 odor 1 no sheen 56'-76' 12!30198 71000 20000 6500 1900 1100D <250 no no na no no no n&' no 56,85 -31.41 slight odor l no sheen 03/25199 48000 15000 1800 910 5100 <0.50 <0.50 <0.50 <0.50 20 <50 56 no no 54.86 •29,42 no comment 06/03/99 33000 96DO 2500 1100 5400 <5.0 <5.0 <5.0 <5.0 <50 <500 750 <5.0 10 54.14 -28,70 no comment 08130/99 51000 7200 5400 2400 11000 42 <20 720 720 <200 <2000 -4200 32 56 56.32 -30.68 no comment 12/10/99 67000 13000 2400 1800 9500 <20 <20 <20 <20 <200 <50 <200 68 46 56.29 -30.85 no comment 03/03/00 28000 6000 280 570 3600 <20 <20 <20 <20 <2D0 <50 <200 <20 <20 54.89 -29.45 no odortno sheen 06/22/00 26000 6500 570 710 2900 <10 <10 <10 <10 -4100 <1000 <100 <10 <10 54.11 -28.67 slight odor/no sheen 09/28/00 30000 920 5300 830 6900 <5.0 no no no no no no no no 56.47 -31.03 slight odor/no sheen 12/22/00 55000 96W 950 1600 8300 <200 no no no no na no no no 55.72 -30.28 odor!no sheen 03126/01 92000 15000 6600 2800 13000 <50 no no no na no no no no 54.68 -29.24 odor lno sheen 06/27101 86000 15000 8900 2600 12000 <50 <50 <50 <50 <500 <5000 <1000 94 130 56.17 -30.73 odor 1 no sheen 09/0610195000 17000 11000 2600 12000 -4500 no no no no no no na no 58.20 -32.76 odor Ino sheen 12104/01 74000 14000 4600 2300 10000 <5D0 no no no no no no na na 58.84 -33.37 odor lno sheen 03/01/02 90000 1300D 8300 2700 12000 <500 no no no no no no no na 57.61 -32.17 odor 1no sheen 05/20102 81000 14000 6200 2100 10000 1100 -4100 -4100 <100 <1000 '10000 -41000 -4100 -4100 57.85 27,39 -30.46 odor Inosheen 08/30102 77000 13000 660D 1600 8800 <1000 no no no no no no no no 60.90 -33.51 odor 1 no sheen 12IM02 75000 16000 1900 2100 11000 <50 no no no no no no no no 60.98 -33.59 odor Ino sheen 474gm-00.,da Project No.1474.44 Page 3 of 8 HORIZON ENVIRONMENTAL INC.