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II • TAS GROUNDWATER MONITORING DATA Ali Beacon Station No.12474 + 3440 East Main Street,Stockton,California II i ethyl- total Depth to TOC GW Well TPI-Igbenzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u !L u !L u 1L u 1L u !L u !L u 1L u !L u 1L u !L u IL u 1L u !L ug/Li feet feet msl feet msl Comments MW-6 03/31/98 78000 23000 8500 1100 6300 <500 na no no na na na na no 61.43 25.44 -35.99 reported as MW-2A screened 06/10/98 120000 23000 17000 1600 15000 <500 no no no no na na no na 58.69 -33.25 reported as MW-2A Interval 09/08/98 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 66'-76' 12/30/98 71000 20000 6500 1900 11000 <250 no no na na no na no no 56.85 -31.41 slight odor 1 no sheen 03!25199 48000 15000 1800 910 5100 <0.50 <0.50 <0.50 <0.50 20 <50 56 no na 54.86 -29.42 no comment 06/03199 33000 9600 2500 1100 5400 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 <5.0 10 54.14 -28.70 no comment 08/30199 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 03/03/00 28000 6000 280 570 3600 <20 <20 <20 <20 <200 <50 <200 <20 <20 54.89 -29.45 no odor lno sheen 06/22/00 26000 6500 570 710 2900 <10 <10 <10 <10 <100 <1000 <100 <10 <10 54.11 -28.67 slight odor 1 no sheen 09/26/00 30000 920 5300 830 6900 <5.0 na no no no no no na no 56.47 -31.03 slight odor/no sheen 12/22/00 55000 9600 950 1600 8300 <200 na no no no na no no no 55.72 -30.28 odor 1 no sheen 03/28/01 92000 15000 6600 2800 13000 <50 no no no na na na no no 54.68 -29.24 odor 1 no sheen 06127101 86000 15000 8900 2600 12000 <50 1511 <50 <50 <500 <5000 <1000 94 130 56.17 -30.73 odor lno sheen 09/06/01 95000 17000 11000 2600 12000 <500 na no no no no na na na 58.20 •32.76 odor 1 no sheen 12104/01 74000 14000 4600 2300 10000 <500 no no no no na na no no 58.81 -33.37 odor 1 no sheen 03/01/02 90000 13000 8300 2700 12000 <500 no no na no no no na na 57.61 -32.17 odor!no sheen 05/20/02 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 na na no no no no no no 60.90 -33.51 odor 1 no sheen 12/06/02 75000 16000 1900 2100 11000 <50 na no no no no na na na 60.98 -33.59 odor 1 no sheen 03/07/03 47000 8500 1400 1900 4600 <500 no no no no no na no na 59.99 -32.60 odorno sheen 06/03/03 37000 5300 630 1600 3200 <25 <25 <25 <25 <250 <2500 <250 <25 <25 57.84 -30.45 odorno sheen 08/29/03 86000 15000 2200 2300 11000 <500 na na no no no na no no 61.33 -33.94 no odor 1 no sheen 11125/03 ns nsl ns ns ns ns ns ns ns ns ns ns ns ns 62.06 -34.67 not sampled 03101/04 ns ns ns ns ns ns ns ns ns ns ns ns AS ns nm 25.23 nm not sampled 06108/04 ns nsns ns ns ns ns ns ns ns ns ns ns ns 61,19 -35.96 not sampled 09/09104 190000 17000 610 4900 14000 <250 no no no na na no ns ns 62.88 -37.65 odor/no sheen 12/08/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 62.98 -37.75 not sampled 03/11/05 18000 4100 69 420 630 <10 <10 <10 <10 <100 <1000 <100 <10 <10 62.45 X97.22 odor 1 no sheen 05/25105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 60.53 -35.30 not sampled 09/02/05 1000 25 3.6 10 90 <5.0 no no na no no na na na 61.42 -36.19 odor 1 no sheen 12/14/05 ns ns' ns ns AS ns ns ns ns ns ns ns ns ns 61.27 -36.04 not sampled h 474q {I' I 1 I 1; �I u �i i I+ 1 ProjW No. 144 74.48 { Page 6 of 18 HORIZON ENVIRONNIRK fAL INC. rOjptl '