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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth 1u TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevahon Elevation Number Date (un/1) (u 11) Au !1 u 11) (u 11) (u 1) {u /1) (ug/4 (u I) (u !1) (ug/1) (u 11) llug/1) (u 11) (feet) (feet msl) feet msl) Comments MW4 10/02/97 35000 9300 600 1100 3600 1800 <5.0 <5.0 <5.0 <500 <50000 <10000 na na 57.45 100.00 42.55 no sheen,no odor screened 03/31/98 2000 14 3.9 <0.50 7.5 <50 na na na na na na na na 49.72 50.28 no sheen,slight odor interval 06110198 2400 6 1.2 <0.50 1.1 12 na na na na na na na na 46.63 53.37 no sheen,slight odor 50'-75' 09!08198 660 2.9 1 4.8 <0.50 120 <0.50 <0.50 40.50 11 230 <5.0 na na 49.87 50.13 no sheen,no odor 12130/98 180 <0.50 0.88 <0-50 1.2 28 na na na na na na na na 44,56 55.44 no sheen,no odor 03/25/99 00 <0 50 <0.50 <0.50 <0.50 6 <0.50 <0.50 <0.50 5.6 <50 <5.0 na na 41.94 58.06 no sheen,no odor 06/02/99 160 <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 08/31/99 460 8.6 40.50 0.85 40.50 540 <0.50 <0 50 <0.50 40 <50 <5.0 <0.50 <0.50 48.39 51.61 no comment 12/09/99 <50 <0.50 40.50 40.50 <0.50 440 <0.50 <0.50 <0.50 24 <50 <5.0 <0 50 <0.50 45.46 54.54 no comment 03101/00 100 <0.50 <0.50 <0.50 <0.50 110 <0.50 <0.50 <0.50 13 <500 <5.0 na na 42.98 57.02 no comment 06/06/00 200 <0.50 <0.50 <0.50 <0.50 62 <0.50 <0.50 <0.50 33 <200 <5 0 <0.50 <0.50 42.53 57.47 Clear 09/14/00 120 0.73 <0.50 <0.50 <0.50 1100 <0 50 <0.50 2.2 70 <700 <5.0 <0.50 40.50 48.58 51 A2 clear 12/12/00 <50 <0.50 <0.50 <0.50 <0.50 420 na na na na na na na na 44.33 55.67 clear 03/19/01 <50 <0.50 <0.50 <0.50 <0.50 140 na na na na na na na na 41.85 58.15 clear 06/19101 60 <0 50 <0.50 <0.50 <0.50 220 na na na na na na na na 45.65 54.35 clear 09/27/01 <100 <1.0 <1.0 <1.0 41.0 350 na na na na na na na na 50.62 49.38 clear 12113!01 52 <0.50 <0.50 <0.50 <0.50 320 na na na na na na na na 46.87 53.13 clear 03/28/02 <50 <0.50 <0.50 <0.50 <0.50 56 na na na na na na na na 43.55 19.97 -23-58 clear 06/19/02 81 <0.50 50.50 40.50 40.50 114 na na na na na na na na 46.21 -26.24 clear 09/16/02 <100 41.0 <1.0 <1.0 <1.0 260 <1.0 <1.0 <1.0 18 <100 <10 41.0 <1.0 51.16 -31.19 clear 1V26/02 <50 <0.50 40.50 <0.50 <0.50 65 na na na na na na na na 47.83 -27.86 clear 03/26/03 <50 <0.50 <0.50 40.50 x0.50 27 na na na na na na na na 45.58 -25.61 clear 06/27103 <50 40.50 40.50 40.50 <0.50 42 <0.50 <0.50 <0.50 45.0 <50 <5.0 <0.50 na 48.30 -28 33 clear 09/19/03 150 32 4-50 9.7 <0-50 390 na na na ne na na na na 54.75 -34.78 clear 12/30/03 450 x0.50 <0.50 <0.50 <0.50 96 na na na na na na na na 50.15 -30.18 Gear 03/26104 <50 <0-50 <0.50 40.50 <0.50 39 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47.88 -27.91 clear 06/17104 <50 <0.50 <0.50 <0.50 <0.50 67 <0.50 <0.50 <0.50 18 <200 <5.0 <0.50 na 5211 ,32.14 clear 09/09/04 <50 0.84 <0.50 <0.50 <0.50 320 <0.50 <0.50 <0.50 20 4500 <5.0 40.50 na 57.17 37.20 clear 12/16104 <50 <0.50 <0.50 <0.50 <0.50 94 na na na na na na na na 53.54 -33.57 clear h,... Protea No,1641.47 Page 4uf9 HORIZON ENVIRONMEN=tAL INC.