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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer bane,Stockton,California Depth to TOC GW Well �TPHg benzene toluene ethylbenzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Date (4 1) (uQ11) u A u A (ug/1u A (u 11)( (uO) u A (ug/1o f (u- A ugh) feet feet msl feet msl Comments MW-2 10102197 83000 16000 18000 2600 12000 940 <10 <10 <10 <1000 <100000 <20000 no na 55.64 98.84 43.20 no sheen,no odor screened 03/31198 1100 68 6 <0.50 99 14 no na na no no na no no 48.45 50.39 no sheen,slight odor interval 06110198 760 20 1.6 <0.50 1.6 <5.0 no no na no no no na no 45.41 53.43 no sheen,slight odor 50'-75' 09!08198 2000 350 <5.0 62 13 130 <0.50 <0 50 <0.50 24 250 <5.0 na no 48.72 50.12 no sheen,no odor 12/30M 97 5.4 <0.50 <0.50 <0.50 11 no no no no no na no na 43.31 55.53 no sheen,no odor 03/25/99 74 2 <0,50 <0.50 <0.50 11 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no no 40.66 58.18 no sheen,no odor 06/02199 1700 5.2 0.8 46 1.1 19 <0.50 <0,50 <0.50 37 <50 <5.0 <0 50 <0.50 41.70 57.14 no sheen,no odor 08!31199 5600 1100 2.6 400 110 930 <2.0 <2,0 <2.0 100 <200 <20 2.7 <2.0 4734 51.50 no comment 12/09/99 420 <0.50 <0,50 <0.50 <0.50 720 <0.50 <0,50 0.51 40 <50 <5,0 0.8 <0.50 44.18 54.66 no comment 03/01/00 150 <0.50 <0.50 <0.50 <0.50 310 <0.50 <050 <0.50 18 <500 <5.0 no no 41.69 57.15 no comment 06/06/00 1200 0.6 <0.50 <0.50 <0.50 62 <0.50 <0.50 <0.50 55 <200 <5.0 <0.50 <0.50 41.37 5747 clear 09/14/00 3400 800 1.8 92 1.0 1000 <0.50 <0.50 0.71 110 <500 <5.0 1.3 <0.50 47.46 51.38 clear 12/12100 56 <0.50 <0.50 <0 50 <0.50 1100 na na no no no no no no 43.16 55.68 clear 03/19/01 <100 0.0 <1.0 <1,0 <1.0 680 no no no no na no no no 40.64 58.20 dear 06/19/01 910 <0.50 <0.50 <0.50 <0.50 140 na na na no no no na no 44.55 54.29 clear 09/27/01 2500 160 0.89 42 2.8 380 no na no no na no na no 49.50 49.34 clear 12/13/01 170 <0.50 <0 50 <0.50 <0.50 1400 na na no na na no no no 45.68 53.16 clear 03/28/02 <200 <2.0 <2.0 <2.0 <2.0 700 no no no no na no no no 42.34 18.75 -23.59 clear 06/19/02 540 <1.0 0.0 <1.0 <1.0 370 na no no no no no no no 45.10 -26.35 clear 09/16/02 5700 730 140 450 250 1100 <0.50 <0.50 0.61 82 <100 <10 1.1 <0.50 50.14 -31.39 clear 12/26/02 <200 <2.0 <2.0 <2.0 <2.0 1200 no no no na na na no na 46.65 -27.90 clear 03/26/03 <100 <10 <1.0 <1.0 <1.0 640 no no no no no no no no 44.38 -25.63 clear 06/27/03 190 <0.50 <0.50 3.0 1.4 400 <0.50 <0.50 <0.50 24J <50 <5.0 <0 50 no 47.20 -28 45 clear 09/19/03 6000 530 280 670 470 1000 no ne no na no na no na 5364 -34.89 clear 12!30103 <200 <1-5 <1.5 <I.5 <1.5 580 no no no no na no no no 48.88 -30.13 clear 03/26/04 <100 <1.0 <1.0 <1.0 0.0 400 <1,0 <1.0 <1.0 <10 <100 <10 <1.0 na 46.64 -27.89 clear 06/17/04 2600 140 58 170 250 360 <0.50 <0.50 <0.50 38 <1500 <5.0 <0.50 no 51.14 -32,39 not sampled 09!09!04 2800 240 30 280 69 980 <2.5 <2.5 <2.5 30J <1800 <20 <2.0 no 56-28 -37.53 clear 12116!04 <50 <0.50 <0.50 <0.50 <0.50 470 no no no no na no no no 52.33 -33.58 Gear 03/03/05 <100 0.0 <10 <1.4 <1.0 390 <1.0 <10 <1.0 <10 <100 <10 <1.0 ne 48.93 -30.18 dear 04 lqmuls Project No.iw !' Pag4`y:_•10 HORIZON EAVIRONL4�,SAL INC