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I 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 (uglL) (uglL) (uglL) (uglL) (uglL) (ug1L) (ugll-) (uglL) (uglL) (ug1L) (ugll-) (ugll-) (ug1L) uglL (feet) (feet msi) (feet msi) Comments MW-5 03MM 450 40.50 <R50 40.50 <0.50 459 no no no no no no 61.11 25.11 -36.00 screened 06110!98 450 40.50 40.50 40.50 40.50 45,0 no no no no na no 58,41 -33.30 no odor 1 no sheen interval 09148/98 <50 <0.50 <0,50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <5.0 <50 45,0 58.41 -33.30 no odor lnosheen 65'-86.5' 121.30!98 450 <0.50 2.5 0,89 5.8 45.0 no no no no na na 56.51 -31.40 no odor 7 no sheen 03/25/99 450 <0.50 <0.50 <0.50 <0.50 40.50 <0,50 <0.50 <0.50 45.0 <50 45,0 54.54 -29.43 no comment 06103799 <SG <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 53.89 •28.78 no comment 08(30/99 95 1.7 7.4 2.1 t5 40.50 40.50 40.50 40.50 45.0 450 45.0 <0.50 <0.50 56,04 -3093 no comment 12!10199 450 <0.50 40.50 <0.50 <0.50 40.50 40.50 <0.50 <0.50 45.0 <50 <5,0 <050 <0-50 55,99 -30,88 no comment 03103/00 <50 <0.50 0.51 40.50 0.92 <0.50 <0,50 <0.50 <0.50 <5.0 <50 6.0 <0.50 <0.50 54.53 -29.42 no odorino sheen 0622700 450 40.50 40.50 40.50 40.50 40.50 40,50 40.50 40.50 45.0 <50 24 <0.50 <G.50 53.75 -28,64 no odorino sheen 09128700 <50 <0550 40.50 <0.50 40.50 45,0 no no no no no no no no 56,19 -31.08 no odor/no sheen 1221100 450 40.50 40.50 40.50 <R50 45.0 no no na no no na no no 55.32 -30.21 no odor/no sheen 0328701 78 2.5 14 2.1 11 45.0 no no no no no na no no 54.44 -29.33 no odor/no sheen 06127/01 450 <0.50 0.68 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <5.0 450 45,0 40.50 40.50 55.89 .30.78 no odorino sheen 670 09101 450 0.64 1.1 0.70 2.0 45.0 no no no no no no no no 57.96 -32.85 no odor/no sheen 12/03/01 <50 <0.50 1.1 40.50 40.50 45.0 no no no na no no no no 58.45 -33.34 no ododlno sheen 02261{12 450 40.50 0.55 40,50 40.50 45.0 no na na no no no no no 57.31 -32.20 no odor/no sheen MW-6 03131/98 78000 23000 8500 1100 6300 <500 no no no no no na 61.43 26.44 -35.99 reported as MW-2A screened 061101% 120000 23000 17000 1600 15000 4500 no no no no no no 58.69 -33.25 reported as MW-2A interval 09108798 120000 30000 20000 2300 18000 <0.50 <0.50 <0.50 <0,50 45.0 <50 <5-0 58.77 -33.33 odor l no sheen 56'-76' 12/30798 71000 20000 6500 1900 11000 4250 no no no no no no 56.85 -31.41 slight odor 1 no sheen 0325799 .48000 15000 1800 910 5400 40.50 <0,50 40,50 40.50 20 450 56 54.86 -29.42 no comment 06103M 33000 96W 2500 1100 5400 <50 <5.0 <5.0 <5.0 <50 4500 <50 45.0 10 54.14 -28.70 no Comment 08130799 51000 7200 5400 2400 11000 42 <20 420 420 <200 42000 4200 32 56 56.32 30.88 no comment 12/10799 67000 13000 2400 1800 9500 <20 420 <20 <20 X200 450 4200 68 46 56.29 -30.85 no comment 03703100 28000 6000 280 570 3600 420 420 <20 420 <200 <50 <200 <20 420 54.89 -29.45 no odor/no sheen 06/22/00 26000 6500 570 710 29W <10 410 <10 <10 <100 <1000 <100 <10 410 54.11 -28.67 slight odor 1 no sheen 0928!00 30000 929 5300 830 6900 <5.0 no no no no na na no no 56.47 -31.03 slight odortno sheen 1222100 55000 9600 950 1600 8300 4200 no no na na no no no no 55.72 -30.28 odor 7 no sheen 03728101 92000 15000 6600 2800 13000 <50 na no no no no na no no 54.68 -29.24 odor 7no sheen 06727/01 86000 15000 8900 2600 12000 450 450 <50 450 4500 45000 <1D00 94 130 56.17 -30.73 odor Inosheen 09106701 95000 17000 11000 26W 12000 4500 no no na no no no no no 58.20 -32.76 odor Inosheen 12104101 74000 14000 4600 2300 10000 <500 no no no na no no no no 58.81 -33.37 odor 1 no sheen 03MV02 90000 13000 8300 2700 12000 <500 no no no no no no no no 57.61 .32.17 odor 7 no sheen MW-7 03t31M 450 40.50 40.50 40.50 40.50 45.0 no no na no no no 61.75 25.66 -36.09 screened 06/10198 450 40.50 <0,50 40.50 40.50 45.0 no na no na no no 59.04 -33.38 no odorI no sheen Interval 09/06/98 <50 40.50 40,50 <0-50 <0,50 40,50 40.50 <0.50 <050 45.0 <50 45,0 59.19 -33,53 noodor lnosheen 56'-76' 12/30198 <50 40,50 <0.50 <G.50 <0.50 <5.0 na no no no no no 57.16 -31.52 no odor 1 no sheen 03725/99 <50 40.50 <050 4050 <1150 40.50 40.50 40.50 40.50 <5,0 450 <&G 55.07 -29.41 no comment 06/03/99 450 <0.50 <0.50 40.50 <0.50 40.50 40.50 40.50 <0,50 <5,0 450 <5-0 5,6 <0-50 54.61 48.95 no comment 08/30799 <50 <0-50 <0.50 40.50 40.50 <0.50 <0.50 <0,50 <0 50 <5.0 <50 <5.0 21 <0.50 56.85 31.19 no comment 12/10/99 <50 40.50 <0.50 <0.50 <0.50 0.50 <0.5G <0,50 40,50 45.0 450 45.0 4,7 <0.50 56.68 -31.02 no comment 03/03/00 450 40.50 40.50 40.50 40.50 0.62 <0.50 40,50 40.50 45.0 450 45.0 5,0 40.50 55.64 -29.95 no odorhw sheen 0626100 450 <0.50 <0.50 <0.50 <0 50 <0.50 <U50 <050 <0.50 45.0 <50 9,4 4.0 40.50 54.62 -28.96 no odor/no sheen 0928700 450 <0,50 40.50 40 50 40.50 <5.0 no no no no no no no no 56.93 -31.27 no odorino sheen 1C20MO ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 24.77 nm wellhead fe-surveyed 1222100 ns ns ns ns ns ns ns ns ns ns n5 ns ns n$ nm nm no odorhto sheen 03/28/01 73 6.2 17 1.5 7.5 45.0 ns ns ns ns ns ns ns ns 54.73 -30.00 no odor/no sheen 0627101 <50 40.50 1.0 40.50 40.50 0.87 40.50 40.50 40.50 45.0 450 <5.0 6.0 40.50 55.99 -31.26 no odor/no sheen 09106701 450 40,50 40,50 40.50 40.50 45.0 no na no no na no no no 58.03 -33.30 no odor/no sheen 12ro3r01 450 40.50 40,W <0,50 40.50 -50 no no no no no na no no 58.41 -33.68 no odor/no sheen 0228102 <50 <0.50 <0.50 <0.50 <0.50 45.0 no no no no no no no no 57.13 -32.40 no ododno sheen Rcj.a No.ta74.44 Page 3 of 7 EiPRIZPK BKYIROKIt1649TAL INC.