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s • • t t 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 MTBEDIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ugly (ug1L) (uglL) (uglL) (ug1L) (uglL) (ug1L) (uglL) (ugll-) (uglL) jug/L) (ugly l(ug/L) uglL (feet) (feet msl) (feet nasi) Comments MW48 03!31198 100 <0.50 <0,50 <0.50 40.50 <5,0 na no na na na no 61.51 25.68 -35,83 reported as MW-3A screened 06/10!98 80 0.9 <0.50 <0.50 <0.50 45.0 no no no na no no 58.86 -33.18 reported as MW-3A Interval 09/08/98 79 0.57 <0.50 40.50 40.50 <0.50 40.50 40.50 <0.50 <5.0 450 45.0 58.97 -33.29 slight odor!no sheen 56'-76' 12/30/98 51 2.4 0.69 <0.50 <0.50 <5.0 no na na no na no 57.13 -31.45 slight odor Inosheen 03/25/99 450 <0.50 40.50 <0.50 40.50 40.50 <050 <0.50 <0.50 45.0 <50 45.13 55.09 -29.41 no comment 06103/99 450 50.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 54.42 -28.74 no comment 08/30199 <50 0.67 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <0.50 <5.0 <50 <5.0 40.50 <0.50 56.60 -30.92 no comment 12/10/99 330 <0.50 40.50 <0.50 <0.50 <0.50 40,50 <0.50 c0.50 5.1 <50 <10 0.51 40.50 56.57 -30.89 no comment 03103!00 <50 <0.50 <0.50 <0.50 <0.50 <&W 40.50 <0.50 40,50 <5.0 <50 45.0 <0.50 <0.50 55.28 -29.60 no odortno sheen 06/22/00 <50 40.50 40.50 <0.50 <0.50 <0.50 40.50 <0.50 <0.50 <5.0 <50 12 0.63 <0.50 54.37 -28.69 no odorino sheen 0928100 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na no no na no na na 56.15 -31,07 no odor/no sheen 1221100 <50 <0.50 <0.50 40.50 <0,50 <5,0 na no no no na no na na 55.92 -30.24 no odorino sheen 0328/01 <50 <0.50 1.4 40.50 1.1 45.13 na no no no no no na na 54.98 -29.30 no odor/no sheen 06f27101 <50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 7.6 <50 45.0 <0.50 <0.50 56.57 -30.89 no odor/no sheen 09/06/01 <50 <0.50 <0.50 40.50 <0.50 <5.0 na no no na na na na na 58.46 -32.78 no odor/no sheen 12/03/01 130 <0.50 <0.50 <0.50 <0.50 <5.0 no na na na na no na na 59.02 -33.34 no odorfno sheen MW-9 03/31/98 <so 40.50 40.50 40.50 40.50 45.0 na na no no na no 62.59 26.58 -36.01 reported as MW-1A screened 06110198 66 <0.50 <0.50 40.50 <0.50 <5.0 na na no no na no 59.91 -33.33 reported as MW-1 A interval 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <0.50 <0.50 <5.0 450 45,0 59.99 -33.41 no odor 1 no sheen 56'-76' 12/30/98 <50 <0.50 <0.50 <0.50 <0,50 <0.50 no no no no na na 58.01 -31.43 no odor 1 no sheen 0325199 450 <0.50 40.50 <0.50 <0.50 40.50 <0.50 40.50 40.50 45.0 <50 <5.0 56,02 -29.44 no comment 06/03/99 92 <0.50 40.50 1.0 5.7 40.50 <0.50 <0.50 40.50 45.0 450 <5.0 5.3 40.50 55,43 -28.85 no comment 08/30199 58 <0.50 40.50 <0,50 <0.50 <0.50 40.50 <0.50 <0.50 <5,0 <50 45.0 0.66 <0.50 57.68 -31.19 no comment 12/10199 140 <0.50 40.50 <0 50 <0.50 <0.50 40.50 <0.50 40.50 <5.0 450 <5.0 0.81 <0.50 57.49 -30.91 no comment 03103100 75 <0.50 40.50 40.50 <0.50 40.50 <0.50 <0,50 <0,50 45.0 450 <5.0 0.99 <0.50 56.54 -29.96 no odortno sheen 0626100 73 40.50 <0.50 40.50 <0.50 <0.50 40.50 <0.50 <0.50 <5.0 <50 10 <0.50 <0.50 55.41 -28.83 no odor/no sheen 09!28100 <50 <0.50 40.50 <0.50 <0.60 <5.0 no no no na na na na na 57.74 -31.16 no odor/no sheen 1222100 210 <0.50 <0.50 <0.50 <0,50 45.0 no no no na no na na na 56.89 -30.31 no odorino sheen 03128/01 140 2.9 14 1.4 6.1 <5.0 na no na no na no na na 55.91 -29.33 no odor/no sheen 06/27/01 200 <0.50 0.81 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <5,0 <50 45.0 <0.50 <0.50 57.47 -30.89 no odor/no sheen 09/06/01 120 <0.50 40.50 <0.50 <0,50 <5.0 no na no na no na na no 59.52 -32.94 no odor/no sheen 12103/01 160 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na no na na 59,93 -33.35 no odorino sheen MW-16 10126199 420 0.65 0.94 40.50 0.88 2.9 40.50 40.50 <0.50 7.1 450 <5.0 2.2 40.50 57.31 25.90 -31.41 no odor/no sheen screened 03/03/00 1100 1.1 <0,50 <0.50 W.50 <0.50 40.50 <0,50 <0.50 28 40.50 <5.0 0.98 40.50 55,32 -29.42 no odor/no sheen Interval 0622100 980 0.85 <0.50 <0.50 <0.50 40.50 <0.50 <0.50 <0.50 17 <50 45.0 0.57 40.50 54.55 -28.65 no odorino sheen 50.5-70.5 0928100 970 1.1 <0.50 40.50 <0.50 <5D na no no na na no no no 56.87 -30.97 no odor/no sheen 1222100 760 0.92 40.50 <0.50 <0,50 49.0 no na no na no na no no 56,08 -30.18 no odortno sheen 0328101 800 1.4 4.4 0.55 2.9 45.0 na na na na na na no no 55,09 -29.19 no odortno sheen j 0827101 420 <0.50 40.50 <0.50 <0.50 40.50 <0.50 <0.50 <0.50 7.5 <50 45.0 40.50 40.50 56.58 -30.68 no odorino sheen 09106/01 350 <0.50 <0.50 <0.50 <0.50 <5.0 na na no na na no na na 58.61 -32.71 no odor/no sheen 12104101 410 <0.50 40.50 <0.50 <0.50 45.0 na no no no na na na no 59.21 •33.31 no odortno sheen I. M 4744mM xis Protect No.1474." Page 4 of 7 HORIZON ENVIRONMENTAL INC.