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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 TPI-Ig=benzernwe benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (u91L) (ug1L) ug/L (feet) {feet msl) {feet ms]) Comments MW-1 03131!98 96 <0.50 <0.50 <0.50 <0.50 <5.0 no na no na na no 62.27 26.29 -39,98 i screened 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns 59,59 -33.30 no comment interval 09108/88 ns ns ns ns ns ns ns ns ns AS ns ns 59.66 -33.39 no comment 75'-90' 12!.30198 ns ns ns ns ns ns ns ns ns ns ns ns 57.70 -31.41 no comment 0325199 =50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.71 06!03!99 <50 < -29.42 no comment 0.50 <0.50 c0.50 =0.50 <0,50 =0.50 c0.50 <0,50 <5.0 <50 <5.0 <0.54 <0.50 55.13 -28.64 no comment 08/30/99 <50 <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 57.38 -31.09 no comment 12/10/99 =50 <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 57.18 -30,89 no comment 03/03/00 94 <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 5622 -29.93 no odorino sheen 06!26100 130 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 =0.50 <O5o <5.0 <50 <5,0 <0.50 <0.50 55.12 -28.83 no odor/no sheen 09128!00 240 <0.50 <0,50 <0.50 <0.50 <5.0 no no na no no no na no 57A3 -31.14 no odorino sheen 1222100 180 <0.50 <0.50 =0.50 <0.50 <5.0 no na no na no no na na 56.56 -3027 no odor/no sheen 031.28MI 180 <0.50 1.5 <0.50 1.2 <5,0 no no no na no na no na 55,61 -29.32 no odor/no sheen 0627101 350 =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 57.43 -31,14 no odor/no sheen 09/06/01 520 <0.50 0.68 <0.50 1.2 <5.0 no no no na no no no no 59.22 -32.93 no odor/M sheen 12103/01 500 <0.50 <0.50 <0.50 <0-50 <5.0 na no no no no no no no 59.91 -33.62 no odor/no sheen 02/28102 790 <0.50 1.8 <0.50 <0.50 <5.0 no no no na no na no no 56.48 32.19 no odWno sheen MW-2 03031/98 5000 1100 86 71 270 TOnano no no no no 61.45 25.42 -3603 screened 06110/98 ns ns ns ns ns ns ns ns ns ns 5876 -3334 no comment interval 09/08/98 ns ns rts ns ns ns ns ns ns ns58.82 33.40 na comment 76'-91.5' 12030198 ns ns ns ns ns ns ns ns ns ns 56.83 -31.41 no comment 03125W 1600 130 1.7 11 50 0.50 <0.50 6.1 <50 25 5490 -29.48 no comment 06103798 14000 8300 730 510 2100 0.50 <0.50 <5.0 <50 <50 28 0.72 5427 -28.85 na comment08/30/99 42000 8900 5000 1200 5800 0.50 <0,50 <5.0 <50 b,0 45 40 56.48 -31,06 no comment 12/10199 12000 1900 680 330 1200 <5.0 <5.0 <5.0 <5.0 <50 <50 <100 <5.0 X5,0 56.33 30.91 no comment 3 COMM 5100 law 33 160 62 <5.0 <5.0 <5,0 <5,0 <50 <50 <50 <5.0 <5.0 54.91 -29.49 no odor/no sheen 06122100 22000 5900 530 630 1700 8.5 <5.0 <5.0 =5.0 <50 <500 <200 <5.0 <50 54.14 -28.72 slight odor/no sheen 0928100 16006 4100 800 260 1500 <50 no no no no na na no na 56.55 -31.13 slight odor/no sheen 1222/00 6700 1200 120 200 330 <50 no no no no no no no no 55.73 30.31 slight odor/no sheen 03!28!01 31000 7600 610 1000 3300 <200 na no no no no na na no 54.69 -29,27 odor/no sheen 0627101 21000 5600 576 640 2100 <25 <25 <25 <25 <250 <5000 1900 <26 <25 56.48 -31.06 odorino sheen 09towl 8900 2000 500 210 840 <100 no na na no no na na no 58.67 -33.25 odor/no sheen 12104/01 28000 6700 1600 910 4000 <250 na no no no na na na no 58.98 -33.56 ododno sheen 03/01/02 57000 12000 1200 1400 6100 <500 na no na no na no no no 57.62 -32.20 odorino sheen I I I I i I I 474gmeo.xh Rufen No 1474.44 Page 1 of 7 HORIZON 11:NYIRONUZZITAL INC.