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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[EDIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ugIL) (ug1L) (ug1L) (ugIL) (ug/L) g1L) (ugIL) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L)(ug/L (feet) (feet msl) (feet msl) Comments MW-5 03/31/98 <50 40.50 <0.50 <0.50 <0.50 <5.0 1 no no no no na no no no 61.11 25.11 -36.00 screened 06/10!98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no na na no 58.41 -33.30 no odor 1 no sheen Interval 09/08/98 <50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <5.0 <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/no sheen 03125M <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no na 54.54 -29.43 no comment 06103!99 <50 <0,50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 53.89 -28.78 no comment 08/30199 95 1.7 7.4 2.1 15 <0.50 <0.50 <0.50 <o,50 <5.0 <50 <5,0 <0.50 <0.50 56.04 -30.93 no comment 12!10199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.99 -30,88 no comment 03/03/00 <50 <0,50 0.51 <0.50 0,92 40.50 <0.50 <0.50 <0.50 <5.0 <50 6.0 <0.50 <0-50 54.53 -29.42 no odor/no sheen 06/22/00 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 24 <0.50 <0.50 53.75 -28.64 no odor/no sheen 09/28700 .450 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no na 56.19 -31.08 no ododno sheen 12/21/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no na no no no na no na 55.32 -30.21 no odor/no sheen 03/28101 78 2.5 14 2.1 11 <5.0 no no no no no nano no 54.44 -29.33 no ododno sheen 06!27!01 <50 <0.50 0.68 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 45.0 <50 <5.0 <0.50 <0.50 55.89 -30.78 no ododno sheen 09!06101 <50 0.64 1.1 0.70 2.0 <5.0 no na no no no no no na 57.96 -32.85 no odortno sheen 12/03/01 <50 <0.50 1.1 <0.50 <0.50 45.0 no no no na no no no na 58.45 -33.34 no odor/no sheen 02/26/02 <50 <0.50 0.55 <0,50 <0.50 <5.0 no na no no no no nono 57.31 -32.20 no odortn0 sheen 05/20/02 220 11 14 6.4 31 <0,50 <0.50 <0.50 <0,50 <5.0 <50 <5.0 <0.50 <0.50 57.53 27.10 -30.43 no odorino sheen 08129/02 <50 <0.50 <0.50 40.50 0.56 <5.0 no no no no no no no no 60.53 -33.43 no odor/no sheen MW-6 03/31198 78000 23000 8500 1100 6300 <500 na no no na no na no no 61.43 25.44 -35.99 reported as NEW-2A screened 06/10/98 120000 23000 17000 1600 15000 <500 no no na no no na no no 58.69 -33,25 reported as MW-2A Interval 09=198 120000 30000 20000 2300 18000 <0.50 <0.50 <0,50 <0.50 <5.0 <50 <5.0 no- no 58.77 -33.33 odor 1 no sheen 56'-76' 12130M 71000 20000 6500 1900 11000 <250 no no no no na no no no 56,85 -31.41 slight odor 1 no sheen 03/25/99 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 9600 25W 1100 5400 45.0 <5.0 <5.0 <5.0 <50 <500 <50 <5.0 10 54.14 -28.70 no comment 08/30/99 51000 7200 5400 2400 11000 42 <20 420 <20 <200 <2000 <200 32 56 56.32 -30.88 no comment 12/10199 67000 13000 2400 1800 9500 <20 <20 <20 <20 <200 <50 4200 68 46 56.29 -30.85 no comment 03103100 28000 6000 280 570 3600 <20 <20 <20 <20 <200 <50 <200 <20 <20 54.89 -29.45 no odorino sheen 06/22/00 26000 6500 570 710 2900 410 <10 <10 <10 <100 <1000 <100 <10 <10 54.11 -28.67 slight oda 1 no sheen 09128100 30000 920 5300 830 6900 <5.0 no no no no no no no na 56.47 -31.03 slight odor/no sheen 17122!00 55000 9600 950 1600 8300 <200 no no no no no no no na 55.72 -30.28 odor tno sheen 03128101 92000 15000 6600 2800 13000 450 no no no na no no na na 54.68 -29.24 odor Ino sheen 06127101 86000 15000 8900 2600 12000 <50 450 450 <50 <500 <5000 <1000 94 130 56.17 -30.73 odortno sheen 09!06101 95000 17000 11000 2600 12000 <500 no na no no no no no no 58.20 -32.76 odor Ino sheen 12104101 74000 14000 4600 2300 10000 4500 no no no na no no no na 58.81 33.37 odor 1 no sheen 03!01702 90000 13000 8300 2700 12000 <500 na no na no no no no no 57.61 -32.17 odor Ino sheen 05/20102 81000 14000 6200 2100 10000 <100 <100 <100 <100 41000 <10000 <1000 <100 <100 57.85 27.39 -30,46 odor Ino sheen 08/30/02 77000 13000 6600 1600 8800 <1000 no no na na na no na na 60.90 -33.51 odor 1 no sheen i I F 474gnw00.x1s ProjaG No.$474 44 Page 3 of 8 HORIZON ENVIRONMENTAL INC.