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i TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to 'FOC CW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol Iethanal OCA EDB GW Elevation Elevation Number Date (u /1) (u9n) (u (u /) u ) u A) (u ) (u /1) u 11 u /I) (u /1] (u I (feet) feet msl) (feet msq Comments MW-1 11114/96 14000 4400 1200 510 1300 1200 no no no no no no no no 57.02 99.53 42.51 sheen screened 03118/97 1900 220 17 41.3 13 270 na no na no na no na no 51.25 48.28 none interval 03131/98 370 28 29 5.2 15 95 no no na no no no na no 49.09 50.44 no sheen,no odor 60'-80' 06/10/98 <50 <0.50 <0.50 <0.50 <0.50 29 na no na no no na na no 46.06 53.47 no sheen,no odor 09108/98 840 190 73 <5.0 130 1100 <0.50 <0.50 0.81 20 2200 <5.0 na no 49.55 49.98 no sheen, odor 12130/98 450 0.96 <0.50 <0.50 <0.50 65 na na na na no no na no 44.03 55.50 no sheen, odor 03125199 80 <0.50 <0.50 <0.50 <0.50 6B <0.50 <0.50 <0.50 516 <50 <5.0 na no 41.41 58.12 odor I no sheen, 06/02/99 60 <0.50 <0.50 <0.50 <0.50 45 <1.0 41.0 41.0 <40 <50 410 <1.0 <1.0 4250 57.03 odor/no sheen, 08/31/99 1500 82 3.6 54 3 3400 <0.5D <0.50 1.3 140 <500 <5.0 <0.50 -050 48.10 51.43 no comment 12/09/99 69 1.2 2.5 <0.50 2.4 640 <0.50 <0.50 <0.50 6.4 <50 <5.0 <0.50 <0.50 44.66 54.67 no comment 03101/00 <200 <2.0 <2.0 <2.0 <2.0 1000 <2.0 <2.0 <2.0 <20 <300 <20 na no 42.45 57.08 no comment 06106/00 <100 <1.0 <1.0 <1.0 <1.0 490 41.0 <1.0 <10 29 4300 <10 <1.0 <1.0 42.14 57.39 clear 09/14/00 170 14 <1.0 2.1 <1.0 2000 <1.0 <1.0 41.0 59 <1000 <10 <1.0 <1.0 48.15 51.38 clear 12112/00 <50 <0.50 <0.50 <0.50 <0.50 2.0 no no na no no no no no 43.85 55.68 clear 03/19/01 <50 <0.50 <0.50 <0.50 <0.50 3.9 no no no no na na na na 41.41 58.12 clear 06119/01 450 40.50 <0.50 <0.50 <0.50 1.6 na na na na na na no na 45.45 54.08 clear 09127/01 <50 <0.50 <0.50 <0.50 0.60 51 na no na no na no net no 50.18 49.35 clear 12/13/01 <50 .40.50 40.50 <0.50 40.50 270 na no no no no na no no 46.41 53.12 clear 03/28/02 52 <0.50 <0.50 <0.50 <0.50 360 na no no no na na na na 43.11 19.47 -23.64 clear 06/19/02 <50 <0.50 40.50 <0.50 40.50 410 na na no na no na no no 45.95 -26.48 clear 09/16/02 <200 0.96 <0.50 <0.50 1.1 630 <0.50 <0,50 <0.50 17 450 <5.0 <0.50 <0.50 51.01 -31.54 clear 12/26/02 <50 -40.50 <0.50 <0.50 40.50 220 na no no no no na no no 47.36 -27.89 clear 03/26/03 <50 1.8 2.7 <0.50 2.1 280 na no no no no na no na 45.10 -25.63 clear 06127/03 170 34 20 1.8 11 160 40.50 <0.50 <0.50 <5.0 450 <5.0 <0,50 na 48.10 -28.63 clear 09/19/03 <50 1.0 0.91 <0.50 0.68 000 na na na na no na na no 54.42 -34.95 clear 12130/03 ns AS ns ns ns ns ns ns ns ns ns ns ns ns 49,49 -30.02 clear 03/26/04 <50 40.50 <0.50 <0.50 <0.50 110 <0.50 <0.50 40.50 <5.0 <50 <5.0 <0.50 no 47.41 -27.94 Clear 06/17/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 52.15 -32.68 not sampled 09/09/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 57.12 -37,65 not sampled 12J16104 no ns nsns ns ns ns ns ns ns ns ns ns ns 52.84 -33.37 not sampled 641 gw,AL Protect No.1641.47 Page 1 of 9 HORIZON ENVIRONMENTAL INC.