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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanal DCA EDB GW Elevation Elevation Number Date (ugA) (ugll) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (feet) (feet msq (feet msl) Comments MW-4 10/02/37 35000 9300 600 1100 3600 1800 <5.0 <5.0 <5.0 <500 <50000 .410000 no no 5745 100.00 42.55 no sheen,no odor screened 03!31/38 2000 14 3,9 <0.50 7.5 <50 no no no no na no no no 49.72 50.28 no sheen,slight odor interval 06/10/98 2400 6 1.2 <0.50 1.1 12 no no no no no no no no 46.63 53.37 no sheen,slight odor 50'-75' 09108!98 660 2.9 1 4.8 <0.50 120 <0.50 <0.50 <0.50 11 230 <5 0 no no 49.87 50.13 no sheen,no odor 12130198 180 <050 0.88 <0.50 1.2 28 no no no no na na no no 44.56 55.44 no sheen,no odar 03!25199 80 <0.50 <0,50 .40.50 <0.50 a <0.50 <0.50 .40.50 5.6 <50 <.0 no no 41.94 58.06 no sheen,no odor 06MV99 160 <0.50 <0.50 <0.50 <0.50 41 <0.50 <0.50 <0.50 25 <50 <5.0 <0.50 <0.50 42.90 57-10 no sheen,no odor 08131199 460 8.6 .40.50 0.85 <0.50 540 <0.50 .40.50 <0.50 40 <50 <5,0 <0.50 <o.50 48.39 51.61 no comment 12109199 <50 <0.50 <0.50 .40,50 <0.50 440 <0.50 <0.50 <0.50 24 <50 <5,0 <0.50 .40.50 45.46 54.54 no comment 031(31100 100 <0.50 <0.50 <0.50 <0.50 110 .40.50 .40.50 <0.50 13 <500 <5.0 no no 42.96 57.02 no comment 06106!00 200 <0.50 <0.50 <050 <0.50 62 <0.50 <0.50 <0.50 33 <200 <5.0 -0.50 <0.50 42.53 57.47 dear 09/14100 120 0.73 <0.50 <0.50 <0.50 1100 <0.50 <0.50 2.2 70 <700 <5.0 <0.50 <0.50 48.58 51.42 dear 121121}0 <50 <0.50 <0.50 <0.50 <0.50 420 no no no no no na no no 44.33 55.67 clear 03)19101 <50 <0-50 <0.50 <0.50 <0.50 140 no no no no no no no na 41.85 58.15 dear 06/19101 60 <0.50 <0.50 <0-50 <0.50 220 no no no na no no no no 45.65 54.35 dear 09/27101 .4100 <1.0 <7.0 <1.0 <1.0 350 no na na no no no na no 50.62 49.38 dear 12!13/01 52 <0,50 <0.50 <0.50 <0.50 320 no no no no no no no no 46.87 53.13 dear 03128102 <50 <0.50 <0.50 <0.50 <0.50 56 no no no no na no no no 43.55 19.97 -23.58 dear 06/19/02 81 .40.50 <0.50 <0.50 <0.50 84 no no no no no no no no 46.21 -26.24 clear 09!16102 <100 <1.0 <1.0 <1.0 <1.0 260 <1.0 <1 0 <1.0 18 <100 <10 <1.0 <1.0 51.16 -31.19 clear 12126/02 <50 <0.50 .40.50 <0.50 <0.50 65 no na no no no no no no 47.83 -27.86 clear 03126103 <50 <0.50 <0.50 s0.50 <0.50 27 no no no no no no no no 4558 -25.61 Gear 06!27103 <50 <0.50 .40.50 <0-50 <0 50 42 <0.50 <0.50 <0.50 <5.0 <50 <5-o <0.50 na 48.30 -28,33 clear 09/19/03 150 3.2 .40.50 9.7 <0.50 390 na no no no na no na na 54.75 -34.78 clear 12130103 <50 <0-50 .40.50 <0.50 <0.50 96 no no na na na na na na 50.15 -30.18 clear 03126!04 <50 .40.50 <0.50 .4050 <0.50 39 <0.50 <0.50 <0.50 <5,0 <50 <5.0 <0.50 na 47.88 -27,91 clear Ofil17104 .450 <0.50 <0.50 <0.50 <0.50 67 <0.50 <0.50 <0.50 18 <200 <5.0 <0.50 na 52.11 -32.14 dear 09109!04 <50 0.84 <0,50 <050 <0.50 320 <0.50 <0.50 <0.50 20 .4500 <5.0 <0.50 no 57.17 -37,20 clear 641 amr,xls Pfvfecl Na,1641,47 Page 4 of 9 HORIZON ENVIRONMENTAL INC.