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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ugly (ug1L) (ugfL) (ugly (ugly (ug/L) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ugly ug1L (feet) (feet ntsl) (feet msl) Comments- Mw-1 1 ommentsMW-11 10/26199 1.600 3.6 0.93 23 1.7 3.1. <0.50 40.50 40.50 45.0 <50 45.0 24 <0.50 57.72 26.14 -31,58 no odor/no sheen j screened 03/03100 300 0.8 <0.50 <0.50 40.50 1.9 <0.50 <050 40.50 45.0 <0.50 45.0 4.9 40,50 55,64 -29.50 no odor/no sheen Interval 06/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' 50'-70' 09/28/00 2000 3.8 0.50 29 0.78 <5.0 no no na no no no na na 57.21 -31.07 no odor/no sheen 12/22/00 1100 2.2 <0.50 2.2 0.65 <5.0 na no no na no no no no 56,41 -30.27 no odor/no sheen 03/28/01 1200 0.98 <0.50 8.6 0.62 <5.0 na no no no na no no no 55,66 -29.52 slight odor/no sheen 06/27/01 1500 1.3 <0.50 12 40.50 <0.50 40.50 <0.50 <0.50 <5.0 <50 45.0 67 40.50 56.92 -30,78 slight odorl no sheen 09106101 950 2.6 1.8 8.7 3.9 <5.0 no no na no na na no no 58.98 •32,84 no odortno sheen 12104101 (IS ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry MW-12 10/26/99 81,000 3,200 11,000 3100 17,000 <2.0 <2.0 42.0 42.0 420 <50 46,000 <50 66 53.51 25.79 -27.72 no odorino sheen screened 03+'03100 70,000 280013,000 2000 11,000 59 <50 <50 450 <500 40.50 36,000 4200 450 55.63 -29.84 no odor/no sheen 62 interval 02100 87,000 2600 14,000 2400 13,000 <20 <20 420 420 <200 <2000 39,000 30 <20 54.64 -28.65 no ododno sheen 84'-89' 09/28100 68,000 7500 3300 2200 7700 <200 no no no no no no no na 56.49 -30.70 slight odorino sheen 1222100 27,000 750 4700 190 5500 4200 no no no no na no no no 56.32 -30.53 odor/nosheen , h 0328!01 67,000 2400 11000 2100 12000 4200 na no no no no no no no 55.20 -29.41 1 odor 1no sheen 06/27/01 93,000 5800 15000 2900 16000 <50 <50 <50 <50 <500 45000 60,000 240 <50 56.45 -30,66 odor Ino sheen 09/06/01 80,000 7100 9500 2400 13000 <250 no no no no no no no no 58.30 -32.51 odor Ino sheen 12104101 81,000 6000 6200 2500 11000 4100 no no no no na na no no 59.16 -33.37 odor Inosheen AS-1 10/26199 1,700 100 7.7 26 27 5.0 <0.50 <0.50 40.50 45.0 <50 200.000 5.6 <0.50 60.94 nm nm no odor/no sheen screened 03/03/00 <200 8.0 <2.0 3.2 Q.0 11 <2.0 <2.0 <2.0 <20 <0.50 69,000 <2,0 <2.0 55.51 nm no odor/no sheen Interval 0622100 <200 8.3 2.8 3.2 4.2 10 <2.0 <2.0 42.0 <20 <200 55,000 <2.0 <2.0 54.84 nm no odortno sheen 70.5-75.5' 0928100 200 5.3 1.2 1.9 2.1 10 no no no no no no ne no 56.63 nm no odorino sheen 12122/00 96 2.0 1.1 <0.50 0.62 32 no na na no na no no no 56.51 nm no odorino sheen 0326101 1,200 70 220 28 120 <10 no no no no na no na na 56.02 nm no odor/no sheen 0627101 600 21 43 3.4 3.9 7.7 40.50 <0.50 <0.50 7.6 450 13,000 1.4 40.50 56.80 nm no odor/no sheen 09106/01 610 19 35 14 32 6.8 no no no no na no na no 58.81 nm no ododno sheen 12/04/01 4,900 540 350 170 880 <25 na no no na no no no no 59.27 nm no odor/no sheen ++ 1 I I 4744nwW,.ds Poled K0.1474.44 Page 5 of 7 HORIZON ENVIRONMENTAL INC.