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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TQC GW WellTPHg benzene toluene benzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (uglL) (uglL) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (ugll-) (uglL) (ugiL) (uglL) (uglL)(ug1L (feet) (feet msl) (feet msl) Comments MW-9 03!31!98 <50 10.50 10.50 19.50 10.50 15.0 no na na na no no no no 6259 26.58 -36.01 reported as MW-1A screened 06/10/98 66 10.50 10.50 10.50 <0.50 <5.0 no no no no no no no no 59,91 -33.33 reported as MW-1A Interval 09/08/98 150 <0.50 10.50 <0.5D 10.50 10.50 10.50 10,50 <0.50 15.0 <50 15.0 na no 59.99 -33.41 no odorinosheen 56'-76' 12!30198 150 10.50 10.50 <0.50 <D.50 10.50 no no no na na no no no 58.01 -31.43 no odor l no sheen 0325!99 <50 10,50 <0.50 10.50 10.50 10.50 10.50 10.50 <0.50 <50 150 15.0 no no 56.02 -29.44 no comment OSM3199 92 10.50 1050 1.0 5.7 10.50 10.50 <0.50 10,50 <5,0 '50 <5.0 5.3 <0.50 55.43 -28.85 no comment 08130!99 58 10.50 <0.50 10.50 10.50 <0,50 10.50 10.50 <0.50 15.0 150 <5.0 0.56 10.50 57.68 -31.10 no comment 12/10/99 140 10.50 10.50 10,50 10.50 10.50 <0,50 <0.50 10.50 <5.0 150 15.0 0.81 10.50 5T49 -30,91 no comment 03103100 75 <0.50 10.50 <0,50 '0.50 <0.50 10,50 10.50 <050 '5.0 <50 <5.0 0.99 10.50 56.54 -29.96 naodorinosheen 0626100 73 10.50 <0.50 <0,50 10.50 10.50 10.50 10.50 <0.50 15.0 150 10 <0.50 <D.50 55.41 -28.83 no odorino sheen 0928100 150 'D.50 10.50 10.50 <050 15.0 na no no no no no no no 57.74 -31.16 noodorino sheen 1222100 210 10.50 10.50 10.50 <0,50 <50 no no no na no no no no 56.69 -30.31 no odorino sheen 03!28111 140 2.9 14 1.4 6.1 <5.O no no no na no no no no 55.91 -29,33 noodorino sheen 06x17101 2D0 10.50 D.81 <0.50 10.50 1050 10.50 10.50 10.50 15.0 40 15.0 10.50 10.50 57.47 -30.89 no odorino sheen 09706/01 120 10.50 10,50 '050 10.50 <5.0 no no na na no no no na 59,52 -32.94 noodorino sheen 12/03/01 160 10.50 <0.50 10,50 10.50 15.0 no na no no no na na na 59.93 -33.35 no odorino sheen 02/28/02 160 10.50 1.3 <0,50 10.50 15.0 na no no no no na no na 58.76 -32.18 noodorino sheen 0520102 140 10.50 060 10.50 <0.50 10.50 <D.50 <0.50 10.50 15.0 <50 15,0 <0.5D 10.50 59.06 28.59 -30.47 no o(forino sheen 0829102 110 <D50 10.50 10.50 <0,50 15,0 no no no no no no no no 62.10 -33.51 noodorino sheen 12106/02 250 10.50 10.50 10.51) <0.50 x0.50 no na no na no no no no 62.28 -33.69 no odorino sheen 03/05/03 710 10.50 10.50 10.50 <050 15.0 no no no no no no no ra 65.23 -32 64 noodorino sheen 06103103 2100 10.50 0.60 10.50 10.50 D0.5 .89 10 10.50 10.50 <5.0 150 <50 5.4 <O So 60.411 -31.89 no odorino sheen 08/28103 160 co 50 <D,50 co 50 10.50 15.0 no no no no no no no no 52.56 -33.97 no odor/no sheen MW-10 1026199 420 0.65 0.94 1050 0.86 2.9 10.50 10.50 10.50 7.1 150 15.0 -2.2 <0 5 0 57,31 25.90 -31.41 naodorinosheen screened 03103100 1100 1.1 10.50 <0.50 10.50 10.50 10.50 <0.50 10.50 28 <0,50 15.0 0.98 10.50 55.32 -29.42 no odorino sheen Interval 0622110 980 0.85 <0.50 <0.50 <050 10.50 10.50 10.50 <0.50 17 150 15.0 0.57 10.50 54.55 -28,65 no odorino sheen 50.5-70.5 0928100 970 1.1 '0.50 <0.50 10,50 15.0 no no no no no no na na 56.87 -30.97 no odor/no sheen 12122MO 760 002 10.50 10.50 10.50 15.0 no no no no no no no no 56.08 -30.18 no odorino sheen 03!28101 800 1.4 4,4 0,55 2.9 15.0 no no na no na no no no 55.09 -29.19 no odorino sheen 06/27101 420 10.50 10.50 <0.50 <0.50 <0.50 10.50 10.50 <0.50 7.5 150 <5.0 10.50 <050 56.56 -30.68 no odor/no$ heen 09/06101 350 10,50 10.50 1050 10.50 <50 na na no na no no na na 58.61 -32.77 no odorino sheen 12174/01 410 10,50 10.50 10,50 1050 15.0 no no no na no no no no 59.21 -33.31 no odor/no sheen 0228102 580 10,50 10.50 <D.50 <0,50 15.0 no na na na no no no no 58.04 -32.14 no odorino sheen OW0102 440 <D.50 <0.50 10.50 <0.50 10.50 10.50 1050 10.50 5.9 <50 <S.D 10.50 10.50 58.22 27.86 -30.36 WightGdor/no sheen 08130102 270 10.50 10.50 10.50 <D_50 15.0 no no no na na no no no 61.15 -33.29 no odor/no sheen 12106102 430 10.50 10.50 10.50 10.50 10.50 na no na na no no no no 61.58 -33,72 no odorino sheen 03107103 430 10.50 10.50 10.50 10.50 <5.0 no no no no no no no no 61.04 -33,18 no odorino sheen 06/03103 480 10.50 10,50 <0.50 10.50 10.50 10.50 10.50 10.50 15.0 150 <5.0 10.50 <D_50 60.21 -32,35 no odorino sheen 08128103 310 10.50 10,50 10,50 10.50 10.50 no no na no no no no no 61.61 -33.75 naodorindsheen MW-11 1026199 1600 3,6 0.93 23 1.7 3.1 10.50 10.50 10.50 15.0 150 15.0 24 10.50 57.72 26.14 -31.58 no odorino sheen screened 03103/00 300 08 10.50 <0,50 10.50 1.9 -050 19.50 10,50 15.0 <D.50 <5.0 49 10.50 55,64 -29.50 no odor/no sheen Interval 0622100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' 501•70' 09!'18100 2000 3.8 0.50 29 0.78 15.0 no no no no no no no na 57.21 -31.07 no odorino sheen 1222100 1100 2.2 10.50 2.2 0.65 15.0 no no no no no no na no 56.41 -30.27 no odarino sheen 0328101 1200 0.98 10.50 8.6 0.62 15.0 no no no na na na no no 55.66 -29.52 slight odor/no sheen 0627101 15W 1.3 10.50 12 10.50 10.50 10.50 10.50 10.50 <5,0 <50 <5.0 67 <0.50 56.92 -30.78 slight odorl no sheen 09/06101950 2.6 1,8 8.7 3,9 15.0 no no na no no no no na 58,96 -32.84 no Morino sheen 12104101 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 15.0 no no no no no no na no 58.29 -32.15 naodor/no sheen 0520102 1400 <0,50 <0.50 1.5 <050 <0.50 <D'50 <0.50 <0.50 15.0 150 15.0 59 10.50 58.57 28.10 -30,47 no odorino sheen 08/30/027400 0.71 10.50 1.4 10,50 15.0 no no no no no na no no fi1.58 -33.48 slight odor/no sheen 12106/02 1100 056 10.50 050 10.50 <0,50 no no no no na na na no 61.80 -33.70 no odorino sheen 03107/03 100D <0.50 10.50 <0.50 10.50 15,0 no no na na no na na no 61.28 -33.18 no odorino sheen 06103103 1200 10.50 10,50 10.50 <0.50 10.50 10.50 <0.50 10.50 <5.0 150 15.0 82 10.50 60.03 -31.93 no Morino sheen 0MM21 1200 10.50 10.50 <0 50 10 50 15,0 no no no no no no no no 62.02 -33.92 no odorino sheen 474Rmid0.1, Pmpct N.1174 4. Page 5 of 8 HORIZON HIMROMMBNTAL Imc.