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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to roc GW Well TPNg benzene toluene elhylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1) (ugA) (ugA) (ugA) (ugA) (uqA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (feet) (feel mal) (Feet msl) Comments MW-3 10102197 1700 90 8.7 0.67 2.6 7.7 <0.50 <050 <0.50 <50 -5000 <1000 no na 57.62 99.68 4200. no sheen,no odor screened 03/31/98 170 0.67 <0.50 <0.50 <0.50 <5.0 na no no na no no no no 1 49.14 50.54 no sheen,no odor interval 06110M <0.50 <0.50 <0.50 <0.50 .40.50 <5.0 no no na na na no na no 4610 53.58 no sheen,no odor 50'-75' 09108/98 <50 4.5 <0.50 <0.50 <0,50 <0.50 <0.50 .40.50 <0.50 12 <50 <5.0 no na 49.74 49.94 no sheen,no odor 12/30198 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no na no na 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 061OM9 <50 <0.50 <0.50 <0.50 <0.50 .40.50 <0.50 <0.50 <0.50 5.4 <50 <5.0 <0.50 <0.50 42.67 5701 no sheen,no odor 08/31199 <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 48.17 51.51 no comment 12!09199 <50 <0.50 <0.50 <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 03101100 <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 061]6100 <50 <0.50 <0.50 <0.50 <0.50 0.58 <0.50 <0.50 <0.50 <5.0 <50 <5.0 -40.50 <050 42.31 57.37 clear 09/14/00 <50 <0.50 40.50 <0.50 <0.50 <0.50 .40.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 48.15 5153 Gear 12/12100 <50 <0.50 <0.50 <0.50 <0.50 3.2 na na no no na na no no 43.91 55.77 clear 03/19101 <50 <0.50 .40.50 <0.50 <0.50 1.4 na na na no na no no no 41.59 58.09 Gear 06!19101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no na no no na na no ne 45.62 5406 clear 09/27101 <50 <50 <1.0 -0.50 <0.50 <0.50 no no no na na no no no 50.21 49.47 clear 12113101 <50 <0.50 <0,50 <0.50 <0.50 8.3 na na na no no no no na 46.54 5314 Gear 03/28102 <50 <0.50 <0.50 .40.50 <0.50 50 no no no na na no no na 43.31 19.15 •24.16 clear 06/19102 <50 <0.50 <0.50 <0.50 <0.50 10 no na no no no no no no 46.20 -27.05 Gear 09!16102 <50 <0.50 '40.50 <0.50 <0.50 18 <0.50 <0.50 <0,50 <5 0 <150 8.9 <0.50 <0.50 51.22 -32.07 dear 12/26102 <50. c0.50 <0.50 <0.50 <0.50 6.7 no no na no no na no no 47.56 -28.41 cloudy 03/26103 <50 <050 .40.50 -0.50 <0.50 5.4 no no no na no na no na 4530 -26-15 clear 06127/03 <50 <0.50 <0.50 <0.50 <0.50 11 .40.50 .40.50 <0.50 <5.0 <50 <5.0 .40.50 no 48.30 -29.15 dear 09119/03 450 <0.50 <0.50 <0.50 <0.50 14 no no no no na no no no 54.51 -35.36 Gear 12/30103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.61 -30.46 dear 03/26/04 <50 <0.50 <050 <0,50 <0.50 2.6 .40.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47.60 -26.45 dear 06117104 ns , ns ns ns ns ns ns ns ns ns ns ns ns ns 52.41 -33.26 not sampled 09109104 <50 <0.50 <0.50 <0,50 <0.50 9.6 <0.50 .40.50 <0.50 <5.0 <50 <5.0 <0.50 na 57,21 -38.06 dear 641 gmr.xls Project No.1541.47 Page 3 of 9 HORIZON ENVIRONMENTAL INC.