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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 TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L (u/L (ug/L (ug/L u lL (u/L (ug/L (u/L (ug/L (ug/L (ug/L (ug/L1(ug1I (ug/L1 feet feet msl feet msl Comments MW-1 03/31/98 96 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 62.27 26.29 -39.98 screened 06/10198 ns ns ns ns ns ns ns ns ns ns ns ns 59.59 -33.30 no comment interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns 59.68 -33.39 no comment 75'-90' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns 57.70 -31.41 no comment 03/25/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.71 -29.42 no comment 06/03199 <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 55.13 -28.84 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 56.22 -29.93 no odor/no sheen ` 06/26/00 130 <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 55.12 -28.83 no odor/no sheen 09/28/00 240 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 57.43 -31.14 no odor/no sheen 12/22/00 180 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.56 -30.27 no odor/no sheen 03/28/01 180 <0.50 1.5 <0.50 1.2 <5.0 na na na na na na na na 55.61 -29.32 no odor/no sheen 06/27101 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 na na na na na na na na 59.22 -32.93 no odor/no sheen 12/03/01 500 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 59.91 -33.62 no odor/no sheen 02/28,02 790 <0.50 1.8 <0.50 <0.50 <5.0 na na na na na na na na 58.48 -32.19 no odor/no sheen 05/20/02 670 <0.50 0.64 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.55 <0.50 58.76 28.28 -30.48 no odor/no sheen MW-2 03/31/98 5000 1100 86 71 270 <25.0 na na na na na na 61.45 25.42 -36.03 screened 06110/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.76 -33.34 no comment interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.82 -33.40 no comment 76'-91.5' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns 56.83 -31.41 no comment 03/25/99 1600 130 1.7 1.1 50 0.62 <0.50 <0.50 <0.50 6.1 <50 25 54.90 -29.48 no comment 06/03199 14000 8300 730 510 2100 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 28 0.72 54.27 -28.85 no comment 08/30/99 42000 8900 5000 1200 5800 0.62 2.0 <0.50 <0.50 <5.0 <50 <5.0 45 40 56.48 -31.06 no comment 12/10/99 12000 1900 680 330 1200 <5.0 <5.0 <5.0 <5.0 <50 <50 <100 <5.0 <5.0 56.33 -30.91 no comment 03/03/00 5100 1800 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 06/22/00 22000 5900 530 630 1700 8.5 <5.0 <5.0 <5.0 <50 <500 <200 <5.0 <5.0 54.14 -28.72 slight odor/no sheen 09/28/00 16000 4100 800 260 1500 <50 na na na na na na na na 56.55 -31.13 slight odorino sheen 12/22/00 6100 1200 120 200 330 <50 na na na na na na na na 55,73 -30.31 slight odor/no sheen 03/28/01 31000 7600 610 1000 3300 <200 na na na na na na na na 54.69 -29.27 odor/no sheen 06/27/01 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1900 <25 <25 56.48 -31.06 odor/no sheen 09/06/01 8900 2000 500 210 840 <100 na na na na na na na na 58.67 -33.25 odor/no sheen 12/04101 28000 6700 1600 910 4000 <250 na na na na na na na na 58.98 -33.56 odorino sheen 03/01/02 57000 12000 1200 1400 6100 <500 na na na na na na na na 57.62 -32.20 odor/no sheen 05/20/02 53000 11000 1500 1300 6200 <50 <50 <50 <50 <500 <5000 <500 <50 <50 57.91 27.44 -30.47 no odor/no sheen 474q.rojed o.14 Page 1 of 7 HORIZON ENVIRONMENTAL INC. Project No.1474.44