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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 ethanol DCA EDB GW Elevation Elevation Number Date (uglq (ugll} (uglq (uglp (ug/1) (ugll} (ug") (ug") (Ug/1) ugJl) (ug11) (ugA) {ugA) (ug/1) (feet) (feet msl) (feet msl) Comments MW-4 10/02197 35000 9300 600 1100 3600 1800 <5.0 <5.0 <5.0 <500 <50000 <10000 no na 57.45 1 D0.00 42.55 no sheen,no odor screened 03/31/98 2000 14 3.9 <0.50 7.5 <50 no no no na no na na na 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 na na no no 46.63 53.37 no sheen,sight odor 50'-75' 09/08198 660 29 1 4.8 <0.50 120 <0.50 <0.50 <0.50 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 no no no no no no 44.56 55.44 no sheen,no odor 03/25/99 80 <0.50 40.50 <0.50 <0.50 8 40.50 <0.50 <0.50 5.6 <50 <5.0 na no 41.94 58.06 no sheen,no odor 06/02/99 160 <0.50 <0.50 <0.50 <0.50 41 40.50 <0.50 <0.50 25 <50 <5.0 <0.50 <0.50 42.90 57.10 no sheen,no odor 08131199 460 8.6 <0.50 0.85 <0.50 540 <0.50 <0.50 <0.50 40 <50 <5,0 <0.50 <0.50 48.39 51.61 no comment 12/09199 <60 <D.50 <0 50 <0.50 <0.50 440 <0.50 <0.50 <0.50 24 <50 <5,0 <0,50 <0.50 4546 54.54 no comment 03/01100 100 <0.50 <0.50 <0.50 <0.50 110 <0.50 <0.50 <0.50 13 <500 <5.0 no na 42.98 57.02 no comment 06/06/00 200 <0 50 <0.50 <0.50 -40.50 62 <0.50 <0.50 <0.50 33 <200 <5.0 <0.50 <0.50 42.53 57.47 clear 09/14100 120 0.73 <0.50 <0.50 <0.50 1100 <0.50 <0.50 2.2 70 <700 <5.0 40.50 <0.50 46.58 51,42 clear 12/12/00 <50 <0.50 <0.50 <0.50 <0.50 420 no na na na no no no no 44.33 55.67 clear 03/19101 <50 <0.50 <0.50 <0.50 <0,50 140 na no na na no not no no 41.85 58.15 Gear 06/19101 60 <0.50 <0.50 <0.50 <0.50 220 no no not no no no no no 45.65 54.35 clear 09/27/01 <100 <1.0 <10 <1.0 <1.0 350 na no no no no na no no 50.62 49.38 clear 12113!01 52 <0.50 <0 50 <0.50 <0.50 320 na na no no no na no no 46.87 53 13 clear 03/28/02 <50 <0.50 <0.50 <0.50 <0.50 56 no na no na na no no na 43.55 19.97 -23.58 clear 06/19102 81 <0.50 <0.50 <0.50 <0.50 84 na na no no no no na 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 12/26102 <50 <0.50 <0.50 <0.50 <0,50 65 na no na no na no no na 47.83 -27.86 clear 03/26103 <50 <0.50 <0.50 <0.50 <0.50 27 no no no na na no no no 45.58 -25.61 clear 06/27/03 <50 <0.50 <0.50 <0,50 <0.50 42 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 48.30 -28.33 clear 09/19/03 150 3.2 <0.50 9.7 <0.50 390 no no na no no no no no 54.75 -34.78 clear 12/30103 <50 <0.50 <0.50 <050 <0.50 96 no no no na no no no no 50.15 -30.18 clear 03/26104 <50 <0.50 <0.50 <0.50 <0.50 39 40.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 47.88 -27.91 clear 06/17104 <50 <0.50 <0.50 <0.50 <0.50 67 <0.50 <0.50 <0.50 is <200 <5.0 <0.50 na 52.11 -32.14 clear 541 gmrAs Project Na.1641.47 Page 4 of 11 HORIZON ENVIRONURNTAL INC.