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• GROUNDWATERITORING DATA • Beacon Station No.12474 3440 East Main Street Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug/L) (ug/L) (ug1L) (ug1L) (uq/L) (ug1L) (ug/L) (ug1L) (ug/L) (ug1L) (ug/L) (ug/L)(ug1L (feet) (feet msi) (feet rnsl) Comments MW-11 10/26/99 1600 3.6 0.93 23 1,7 3.1 <0.50 <0.50 <0,50 <5.0 <50 <5.0 24 <0.50 57-72 26.14 -31.58 no ododno sheen screened 03103/00 300 0.8 <0.50 <0.50 <0.50 1.9 <0.50 <0.50 <0.50 <5.0 <0.50 <5.0 4.9 <0.50 55.64 -29.50 no odarina sheen interval 06/22110 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' 810 50'-70' 09/20 2000 3.8 0.50 29 0.78 <5.0 no no no no na no no no 57.21 -31.07 no odorino sheen 12!22100 1100 2.2 <0.50 2.2 0.65 <5.0 no no no no no no no no 56.41 -30.27 no odortno sheen 03/28/01 1200 0.98 <0.50 8.6 0.62 <5.0 no no no no no no na na 55.66 -29.52 slight odor/no sheen 06/27111 1500 1.3 <0.50 12 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 67 <0.50 56.92 -30,78 slight odorl no sheen 09106!01 950 2.6 1.8 8.7 3.9 <5.0 no no no no no na no no 58.98 -32.84 no odor/no sheen 12104/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 03101!02 770 1.1 1.4 0.55 2.3 <5.0 na na na na na no no na 58.29 -32.15 no odor/no sheen 05120172 1400 <0.50 <0.50 1.5 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59 <0.50 58.57 28.10 -30.47 no odor/no sheen 08/30112 1400 0.71 <0.50 1.4 <0.50 <5.0 no no no no no no na na 61.58 -33.48 slight odor/no sheen 12/06102 1100 0.56 <0.50 0.50 <0.50 <0.50 no no no na na no no no 61.80 -3370 no odorino sheen 031DW03 1000 <0.50 <0.50 <0.50 <0.50 <5.0 no no no na na na no no 6128 -33.18 no odor/no sheen 06103103 1200 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 82 <0-50 60.03 -31.93 no ododno sheen 08/29/03 1200 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no na 62.02 -33.92 no odor/no sheen 11!25103 1500 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no no 62.85 -34.75 no odor/no sheen 03101104 1300 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 90 <0.50 61.52 26.05 -35.47 no odorino sheen 06118104 1200 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no na no 62.02 -35.97 no ododno sheen MW-12 10/26199 81000 3200 17000 3100 17000 <2.0 <2.0 <2.0 <2.0 <20 <50 46000 <50 66 53.51 25.79 -27.72 no odor/no sheen screened 03/03/00 70000 2800 13000 2000 11000 59 <50 <50 <50 c500 <0.50 36000 <200 <50 55.63 -29.84 no odor/no sheen interval 06122100 87000 2600 14000 2400 13000 <20 <20 <20 <20 <200 <2000 39000 30 <20 54.64 -28.85 no odor/no sheen 94'-89' 09!28/00 68000 7500 3300 2200 7700 <200 no no no no no no no no 56.49 -30.70 slight odor/no sheen 12/22/00 27000 750 4700 190 5500 <200 no na no no no no no no 56.32 -30.53 odor 1no sheen 03/28!01 67000 2400 11000 2100 12000 <200 no na no no no no no na 55.20 -29.41 odor Ino sheen 06/27/01 93000 5800 15000 2900 16000 <50 <50 <50 <50 <500 <5000 60000 240 <50 56.45 -30.66 odor/no sheen 09106!01 80000 7100 9500 2400 13000 <250 no no na no no no no no 58.30 -32.51 odor Ino sheen 12/04/01 81000 6000 6200 2500 11000 <100 no no no no no no no no 59.16 -33.37 odor!no sheen 03/01/02 69000 5900 5500 2000 9500 <250 no no na no no no no na 58.03 -32.24 odor/no sheen 05/20/02 43000 4700 3700 830 5700 <25 <25 <25 <25 <250 <2500 41000 440 <25 58.29 27.75 -30.54 odor/no sheen 08/30/02 38000 4700 3300 860 4500 <200 na no no no no na no na 61.03 -33,28 odor f no sheen IZ%02 27000 3400 2600 220 4300 <20 na na na na na na no no 61,51 -33.76 odor Inosheen 03/07103 54000 6200 4800 940 8400 <250 no no na na no no no no 60.93 -33.18 odor/no sheen 06/03103 28000 2800 2200 57 4400 <10 <10 <10 <10 <100 <1000 <600 <10 <10 59.99 -32.24 odor/no sheen 08/29103 76000 4300 3600 2000 10000 <100 no no no no no no no no 61.42 -33.67 no odorin0 sheen 11125/03 ns no ns no no ns ns ns ns ns ns ns ns ns 62.48 -34.73 not sampled 031D1I04 78000. 6100 5200 2700 12000 <10 <10 <10 <10 <100 <1000 <200 140.0 <10 61.23 25.68 -35.55 odor l no sheen 06!08104 ns ns ns ns ns ns ns ns ns ns ns no ns ns 61.56 -35.88 not sampled 474grnr00.bs Project No.1474.44 Page 6 of 11 HORIZON ENV OKMENTAL INC.