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r TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- totalDepth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u !L (ug/L u 1L u !L (u/L (ug/L �(uqll-)_ u1L u !L (ug/L u 1L) u 1L u 1Lluci/LJ feet feet msl feet msl Comments MW-5 0361198 <50 <0.50 <0.50 -0.50 <0.50 <5.0 no no na no na no no no 61.11 25.11 -36.00 screened 06110/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no na na no no no na na 58.41 -33.30 no odor Ino sheen Interval 09108/98 <50 <0.50 <0.50 <0.50 <0.5G <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' 12130!98 <50 -0.50 2.5 0,89 5.8 -5.0 no no na no na no na no 56.51 -31.40 no odor no sheen 03125/99 <50 <0.50 <D.50 <0.50 <0.50 <0.50 -0,50 <0.50 50.50 <5.0 <50 <5.0 no no 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 08/30/99 95 1.7 7.4 2.1 15 <0.5G <0,50 <0.50 -0.50 <5.0 <50 <5.0 <0.50 c0.50 56.04 -30.93 no comment 12110/99 <50 -0.50 <0.50 <0.50 <0.50 <0.50 <0,50 -0.50 <0.50 -5.0 <50 15.0 <0.50 <0.50 55.99 -30.88 no comment 03/03/00 <50 <0.50 0.51 <0.50 0,92 <0.50 -13.50 <0.50 <0.50 <5.0 <50 6.0 -0.50 <0.50 54.53 -29.42 noodorino sheen 06122/00 <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 odorino sheen 09128/00 <50 -13,50 <0.50 -0.50 <0.50 <5.0 no no no no no no na no 56.19 -31.08 no odorino sheen 12121100 <50 -0.50 <0.50 <0.50 -0.50 <5.0 na no no no no no na no 55.32 -30.21 noodorino sheen 03128/01 78 2.5 14 2.1 11 <5.0 no no na no no no no no 54.44 -29.33 no odorino sheen 06127/01 <50 -0.50 0.68 <0.50 -0.50 -0.50 <0.50 -13.50 <0.50 <5.0 <50 <5.0 -13.50 -0.50 55.89 -30.78 no odorino sheen 69106/01 <50 0.64 1.1 0,70 2.0 <5.0 no na no no no no na no 57.96 -32.85 no odorino sheen 12103101 <50 -0.50 1.1 <0.50 <0.50 <5.0 no no na na no na na no 58.45 -33.34 no odorino sheen 02128102 <50 <0.50 0.55 -0.50 -0.50 <5.0 no no na no no no no no 57.31 -32.20 no odorino sheen 05120102 220 11 14 6.4 31 <0.50 <0.50 <0 50 50.50 -5.0 <60 '50 <0.50 <0.50 57.53 27.10 -30.43 no odorino sheen 08/29/02 <50 <0.50 <0.50 <0.50 0.56 <5.0 no na no no no no no no 60.53 -33.43 no odorino sheen 12106102 -50 0.73 1.7 -0.50 1.5 -0.50 no no no no no no no no 60.71 -33.61 no odor/no sheen MW-6 03131198 78000 23000 8500 1100 6300 -500 no no na no no no na na 61.43 25.44 -35.99 reported as MW-2A screened 06110198 120000 23000 17000 1600 15000 <500 no no na no no no no na 58.69 -33.25 reported as MW-2A Interval 09/08198 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 I no sheen 56'-76' 12130198 71000 20000 6500 1900 11000 <250 no no no na na no no no 56.85 -31.41 slight odor I no sheen 03/25/99 48000 15000 1800 910 5100 50.50 -0.50 <0.50 <0.50 20 <50 56 no no 54.86 -29.42 no comment 06/03199 33000 9600 2500 1100 5400 <5.0 <5,0 <5.0 <5.0 <50 -500 <50 <5.13 10 54.14 -28.70 no comment 08/30/99 51000 7200 5400 2400 11000 42 <20 <20 <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 -200 68 46 56.29 -30.85 no comment 03/03100 28000 6000 280 570 3600 <20 <20 <20 <20 -200 <50 -200 <20 <20 54.89 -29.45 no odorino sheen 06122100 26000 6500 570 710 2900 <10 <10 <10 <10 -100 -1000 <100 <10 <10 54.11 -28.67 slight odor I no sheen 09128100 300017 920 5300 830 6900 <5.0 no na no na no no no na 56.47 -31.03 slight odor/no sheen 12122100 55000 9600 950 1600 8300 <200 no no no as no no no na 5572 -30.28 odor/no sheen 03128101 92000 15000 6600 2800 13000 <50 no na no no na no no no 54.68" -29.24 odor/no sheen 06127101 86000 15000 8900 2600 12000 <50 <50 <5G <50 <500 <5000 <1000 94 130 56.17 -30.73 odor/no sheen 09106101 95000 17000 11000 2600 12000 <500 no no na na no no no na 58.20 -32.76 odor lno sheen 12104/01 74000 14000 4600 2300 10000 <5GD no no no no no na no no 58.81 -33.37 odor I no Sheen 03101102 90000 13000 8300 2700 12000 <600 no no no no no no no no 57.61 -32.17 odor lno sheen 05!20102 81000 14000 6200 2100 10000 -100 <100 -100 <100 <1000 <10000 -1000 <100 -100 57.85 27.39 -30.46 odor lno sheen 08/30102 77000 13000 6600 1600 8800 <1000 no na no no no no no no 60.90 -33,51 odor lno sheen 12/06102 75000 16000 1900 2100 11000 <50 na no no no no no na no 60.98 -33.59 odor lno sheen 474gm/0o.x1s Project No.1474 44 Page 3 of 8 HORIZON ENVIRONMENTAL INC.