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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 TPI-Ig benzene toluene benzenexylenes MTBE DIPE ETBE TAME TBA methanolethanol EDC EDB I GW Elevation Elevation Number Date �(ug&) (ug/L (ug/L (ug/L (u !L) ((ug/L u IL u IL u IL u 1L) (u /L) (ug1u 1L) u 1L (feet) feet msl feet msl Comments MWA 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 06110/98 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' 12130/98 ns ns ns ns ns ns ns ns ns ns ns ns 57.70 -31.44 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 06/03/99 <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 55.13 -28.84 no comment 08130/99 <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 06/26100 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 09/28100 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 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 09108/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.82 -33,40 no comment 76'-91.5' 12/30198 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 06/03/99 14.000 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 08/30199 42,000 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 12110!99 12,000 1900 680 330 1200 <5.0 <5.0 <5.0 <5.0 <50 <50 <100 <5.0 <5.0 56.33 -30.94 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 22,000 5900 530 630 1700 8.5 <5.0 <5.0 <5.0 <50 <500 <200 <5.0 <5.0 54.14 -28.72 slight odorino sheen 09/28100 16.000 4100 800 260 1500 <50 na na na na na na na na 56.55 -31.13 slight odorino sheen MW-3 03/31/98 72 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.53 25.54 -35.99 screened 06/10198 ns ns ns ns n9 ns ns ns ns ns ns ns 58.85 -33.31 no comment interval 0910"a ns ns ns ns ns ns ns ns ns ns ns ns 58.94 -33.40 no comment 75'•90' 12/30198 ns ns ns ns ns ns ns ns ns ns ns ns 56.96 -31.42 no comment 03/25/99 73 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5.0 <50 <5.0 55.01 -29.47 no comment 06103/99 65 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 88 <0.50 54.39 -28.85 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 80 <0.50 56.61 -31.07 no comment 12110/99 51 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 60 <0.50 56.47 -30.93 no comment 03103/00 <50 <0.50 <0.50 <0.50 <0.50 5.0 <0.50 <0.50 <0.50 <5.0 <50 <5.0 32 <0.50 55.39 -29.85 no odor/no sheen 06122!00 <50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 21 18 <0.50 54.32 -28.78 no odor/no sheen 09128/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.71 -31.17 no odorino sheen I 474gmr00.xls 1474.43 Page 1 of 5 HORIZON ENVIRONMENTAL INC.