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i TABLE 1 Y 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 DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug1L) Jug/L) (ug/L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (u91L)(ug1L (feet) (feet msl) (feet msl) Comments MW-9 03!31198 <50 <0.50 <0,50 <0.50 <0.50 <5.0 no no na no na no no no 62.59 26.58 -36.01 reported as MW-1A screened 06/10198 66 50.50 50.50 <0.50 <0.50 55.0 no na no no na no no no 59.91 -33.33 reported as MW-1A Interval 09108/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 na no 59.99 -33.41 no odor!no sheen 56'•76' 12130!98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na no na no no no no na 58.01 -31.43 no odor!no sheen 03/25/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 55.0 na no 56.02 -29.44 no comment 06!03199 92 <0.50 <0.50 1.0 5.7 <0.50 <0.50 50.50 <0.50 <5.0 <50 <5.0 5.3 <0.50 55.43 -28,85 no comment 08/30/99 58 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.66 <0.50 57.68 -31.10 no comment 12/10/99 140 <0.50 50.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 55.0 0.81 <0.50 57.49 -30.91 no comment 03/03100 75 50.50 50.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 55,0 0.99 <0.50 56.54 -29.96 no odorino sheen 06126100 73 50.50 <0,50 <0.50 <0.50 50.50 <0.50 <0.50 <0.50 <5.0 550 10 50.50 <0.50 55.41 -28.83 no odor/no sheen 09128/00 550 <0.50 50,50 <0.50 <0.50 55.0 no no no no no na no no 57.74 -31.16 no odorino sheen ,2122100 210 <0.50 50.50 <0.50 <0.50 <5.0 no no no no na na no no 56.89 -30.31 no odorino sheen 03128!01 140 2.9 14 1.4 6.1 <5.0 no na no no na no no no 55.91 -29.33 no odor/no sheen 06/27/01 200 <0.50 0.81 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 55,0 <50 <5.0 <0.50 <0.50 57.47 -30.89 no odor/no sheen 09/06/01 120 <0.50 <0.50 50.50 <0.50 <5.0 no no na no na no no na 59.52 -32.94 no odor/no sheen 12!03101 160 <0.50 <0.50 <0.50 <0.50 <5.0 no no no na na no no na 59.93 -33.35 no odorino sheen 02/28102 160 <0.50 1.3 <0.50 <0.50 <5.0 no na na no no na no no 58.76 -32.18 no odorino sheen 05120102 140 <0.50 0.60 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 550 <5.0 <0.50 <0.50 59.06 28.59 -30.47 no odorino sheen 08129/02 110 <0.50 <0.50 50.50 50.50 55.0 na no na no no na no no 62.10 -33.51 no odor/no sheen MW-10 10/26/99 420 1 0.65 0.94 <0.50 0.88 2.9 <0.50 <0.50 <0.50 7,1 <50 <5.0 2.2 <0.50 57.31 25.90 -31.41 no odor/no sheen screened 03/03100 1100 1.1 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 50.50 28 <0.50 <5.0 0.98 <0.50 55.32 29.42 no odorino sheen Interval 06122!00 980 0.85 <0.50 <0.50 50.50 <0.50 <0.50 <0.50 <0.50 17 <50 <5.0 0.57- <0.50 54.55 .28.65 no odor/no sheen 50.5-70.5 09128100 970 1.1 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 56.87 -30.97 no odorino sheen 12122/00 760 0.92 <0.50 50.50 <0.50 <5.0 no no no no na no no na 56.06 -30.18 no odorino sheen 03!28101 800 1.4 4.4 0.55 2.9 <5.0 no no no no no no no no 55.09 -29.19 no odor/no sheen 06127!01420 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 7.5 <50 <5.0 <0.50 50.50 56,58 -30.68 no odorino sheen 09/0610, 350 50.50 <0.50 <0.50 <0.50 <5.0 no na no na na na no no 58,61 -32.71 no odorino sheen 12/04101 410 <0.50 <0.50 <0.50 <0.50 <5.0 no no no na no na no no 59.21 -33.31 no odor/no sheen 02/28/02 580 50.50 50.50 50.50 50.50 <5.0 nono na na na no na no 58.04 -32.14 no odor/no sheen 05/20/02 440 <0.50 <0.50 <0.50 <0.50 50.50 50.50 50,50 50.50 5.9 <50 <5.0 <0.50 <0.50 58,22 27.86 -30.36 slight odorino sheen 08!30102 270 <0.50 <0.50 <0.50 <0.50 <5.0 na no no na no no no na 61.15 -33.29 no odor/no sheen MW-11 10126199 1600 3.6 0.93 23 1.7 3.1 <0.50 <0.50 50.50 <5.0 <50 <5.0 24 <0.50 57.72 26.14 -31.58 no odorino sheen screened 03/03/00 300 0.8 <0.50 <0.50 <0.50 1.9 <0.50 <0.50 <0.50 <5.0 <0.50 <5.0 4.9 <0.50 55.64 -29.50 no odoTlno sheen Interval 06122100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' 50'-70' 09/28100 2000 3.8 0.50 29 0.78 <5.0 no no no no na no no no 57.21 -31.07 no odor/no sheen 12122100 1100 2.2 <0.50 2.2 0.65 <5.0 no na na no na no no no 56.41 -30.27 no odorino sheen 03!28101 1200 0.98 <0.50 8.6 0.62 <5.0 no na no no no no no na 55.66 -29.52 slightodor/no sheen 06127101 1500 1.3 <0.50 12 <0.50 <0.50 <0,50 <0.50 <0.50 <5,0 <50 <5.0 67 <0.50 56.92 -30.78 slight odor!no sheen 09!06/01 950 2.6 1.8 8.7 3.9 <5 0 no no no no no no no no 58.98 -32.84 no odorino sheen 12/04/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 03101102 770 1.1 1.4 0.55 2.3 55.0 no no no no no no na no 58.29 -32.15 no odor/no sheen 05120/02 1400 <0.50 <0.50 1,5 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 550 <5.0 59 <0.50 58.57 28.10 -30.47 no odor/no sheen It 08/30/02 1400 0.71 50.50 1.4 <0.50 55.0 no na na no na no na no 61.58 -33.48 slight odorl no sheen 474gmrOO ala Project No,1474.44 Page 5 of 8 HORIZON ENVIRONMENTAL INC. ■