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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 121Q 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 (ug") (ugA) (ug/1) (ug/1) (ug/1) (U9,11) (Ug/1) (uglq (Ug/1) (Ug/1) (ugA) (uglq (ugll) (u A) (feet) (feet msi) (feet msl) Comments MW-3 10102!97 1700 90 8.7 0.67 2.6 7.7 <0.50 <0.50 <0.50 <50 <5000 <1000 na me 57.62 99.68 42.06 no sheen,no odor screened 03131/98 170 0.67 -40.50 <0.50 <0.50 <50 no no no no no no no na 49.14 50.54 no sheen,no odor interval 06!10198 <0.50 <0.50 <0.50 <0.50 <0.50 45.0 na na no no na no na na 46.10 53.58 no sheen,no odor 50'-75' 09108/98 <50 4.5 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0,50 12 <50 <5.0 no no 49.74 49.94 no sheen,no odor 12/30/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 44.17 55.51 no sheen,no odor 03/25/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <5.0 <50 <5.0 no no 41.57 58.11 no sheen,no odor 06102!99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 5.4 <50 <5.0 <0.50 <0.50 42.67 57.01 no sheen,no odor 06131/99 <50 <0.50 <0.50 <0.5o <0.50 <0.50 <0.50 <0.50 -40.50 <5.0 <50 <5.0 <0.50 <0.50 48.17 51.51 no comment 12109/99 <50 <0.50 -40.50 <0.50 <0.50 3.1 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 44.96 54.72 no comment 03101/00 <50 <0.50 <0 50 <0.50 <0.50 0.91 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no no 42.62 57.06 no comment 06106/00 <50 <0.50 <0.50 <0.50 <0.50 0.58 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 42.31 57.37 clear 09114/00 <50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 48.15 51.53 clear 12112/00 <50 <0.50 <0.50 <0,50 <0.50 3.2 no no na no no na no no 43.91 55.77 clear 03!19101 <50 <0.50 -40.50 <0.50 <0.50 1.4 no no no no no no no no 41.59 58.09 clear 06119/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no no 45,62 54.06 clear 09/27/01 <50 <0.50 <1.0 <0.50 <0.50 <0.50 no no no no no no no na 50.21 49.47 clear 12/13/01 <50 <0.50 <0.50 <0.50 <0.50 8.3 no no no no no no no no 46.54 53.14 clear 03/28/02 <50 <0.50 <0.50 <0,50 <0.50 5.0 no no no na no no no no 43.31 19.15 -24.16 clear 06/19/02 <50 <0.50 <0.50 <0.50 -40.50 10 no na no no no no no no 4620 -27.05 clear 09/16/02 <50 -40.50 <0.50 <0.50 <0.50 18 <0.50 <0.50 <0.50 <5.0 -4150 8.9 <0.50 <0.50 51.22 -32.07 clear 12!26102 <50 <0.50 <0.50 <0.50 <0.50 6.7 no no no no no no no na 47.56 -28.41 cloudy 03126/03 <50 <0.50 <0.50 <0.50 <0.50 5.4 no no no no no no no no 45.30 -26.15 clear 06/27/03 <50 <0.50 <0.50 eo.50 <0.50 11 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 48.30 -29.15 dear 09/19/03 <50 <0.50 <0.50 <0.50 <0.50 14 no no no no na no no no 54.51 -35.36 clear 12130/03 ns ns ns ns no ns ns ns ns ns ns ns ns n5 49.61 -30.46 clear 03/26/04 <50 <0.50 <0.50 <0.50 -40.50 2.8 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 47.60 -28.45 clear 06/17/04 ns ns ns ns ns ns ns ns no ns ns ns ns ns 52.41 -33.26 not sampled 641 gmr.xls Project No.1641.47 Page 3 of 11 HORIZON ENVIRONMENTAL INC.