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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 u IL u IL a 1L u 1L u 1L (uq/!- MIL) u 1L (u/L u IL a 1L u 1L u 1L u IL feet feet sl feet msl Comments 03131!98 96 c0.50 =0.50 <0.50 <0.50 <5.0 na na na na na na na na 62.27 26.29 -39.98 screened 06!10198 as ns ns ns ns ns ns as ns ns ns ns na na 59.59 Interval 09108!98 ns as ns as as ns ns ns as ns ns as na na 59.68 33.30 no comment 75'-90' 12/30/98 ns ns as ns ns ns ns ns ns -33.39 no comment 03!25199 < as ns ns na na- 57.70 -31.41 no comment 50 c0.50 =0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 na na 55,71 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 < -2942 no comment 0.50 <0.50 55.13 -28.64 no comment 08130199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 =5.0 <50 =5.0 cO,SD <0.50 57.38 12!10199 -50 <0.50 <0.50 <0.50 <0.50 =0.51) <0.50 =0.50 <0.50 <5.0 <50 <5.p <D.50 <0.50 57.18 31'09 no comment 03!03100 94 <0.50 <0.50 <0.50 <0.50 <D.50 <0.50 =0.50 <0.50 <5.0 <50 < -30.89 no comment 06!26!00 130 <0.50 <p.50 <0.50 <0.50 <0.50 <0.50 c0.50 <0.50 <5.0 <50 <5.0 <0.5p <0.50 56.22 -29.93 no odor/no sheen 09128!00 240 <0.50 <0.50 <0.50 <0.50 <5.0 na na 5.0 <0a <0,50 55.12 -28.83 no odorino sheen 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 c5.0 na na na na na na as na 56.56 03/28/01 180 <0.50 1.5 <0.50 1.2 <5.0 na na na na na na na na 55.61 -30'27 no odorino sheen 06!27!01 350 <0.50 <0.50 <0.50 c0.51) <0.50 <0.50 <0.50 <0.50 <5.0 <50 < 29.32 no odor/no sheen 09106!01 520 <0.50 0.68 <0.50 1.2 <5.0 na na na 5.0 c0.50 <0.50 57.43 -31.14 no odorino sheen 12103!01 500 <0.50 <0.50 <0.50 <0.5D <5.0 na na na na na na na 59.22 32.93 no odorino sheen na na na na na na 59.91 -33.62 no odor/no sheen 02128102 790 =0.50 1.8 c0.54 <0.50 c5.0 na na na na na na na na 56.46 05120102 670 <0.50 -32.19 no Ddor/no sheen 0.6A <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 odorino sheen 08!29!02 530 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 61,77 12/06/02 740 <0.50 <0.50 <0.50 <0.50 <0.50 na na -33.49 no odorino sheen na na na na na na 69.16 03/07703 910 <0.50 <0.50 <0.50 <0R50 <5.0 na na na na na na -40.88 no odor/no sheen 06103103 1800 <0.50 <0.50 <0.50 <0,50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 < na na 61.42 -33.14 no odorino sheen 5.0 4.9 c0.50 60.14 31.86 no odorino sheen MW-2 03!31!98 5000 1100 86 71 270 <25.0 na na na na as na na na 61.45 25.42 -36,03 screened 06!10198 ns as ns ns ns ns as ns ns as ns ns na na 58.76 interval 09/08/98 ns as ns ns ns ns as ns ns ns ns as na na 58.82 33'34 no comment 76'-51.5' 12!30798 ns ns as as as ns ns ns as ns ns ns na na 56.83 33.40 no comment 03125/99 1600 130 1.7 1.1 50 0.62 <0.50 <0.50 c0,50 6.1 <50 25 na na 54.90 31.41 no comment 06103199 14000 8300 730 510 2100 <0.50 <0.50 <0.50 <0.50 <5.0 <50 =5.0 28 0.72 54.27 -29'48 no comment 08!30!99 42000 8900 5000 1200 5600 0.62 2.0 <0.50 =0,50 <5.0 <50 < -26.85 no comment 12110199 12000 1900 680 5.0 45 40 56.48 330 1200 <5.0 <5.0 <5.0 <5.0 < -31.06 no comment 03103!00 5100 1800 33 160 62 < 50 <50 <100 <5.0 <5.0 56.33 -30.91 no comment 5.1) =5.0 <5.0 <5.0 =50 <50 <50 c5.0 <5.0 54.91 06122!00 22000 5900 530 630 1700 8.5 <5.0 c5.0 =5.0 <50 <500 <200 <5.0 <5.0 54.14 -29'49 no odorino sheen 09128/00 16000 4100 800 260 1500 =50 na na na na na na na na 56.55 -28.72 slight odorino sheen 12/22/00 6100 1200 120 200 330 <50 na na na -31.13 slight odor/no shggn na na na na na 55.73 -30.31 slight odorino shun 03/28101 31000 7600 610 1000 3300 <200 na na as na na na 06127!01 21000 5800 570 na na 54.69 29.27 odor/no sheen 640 2100 c25 <25 <25 Q5 <250 <5000 1940 <25 <25 56.48 09106101 8900 2000 500 210 840 <100 na na na na na na na na 58.67 -31.06 odor/no sheen 12104!01 28000 6700 1600 910 4000 <250 na na na na na na na na 58.98 33'25 Morino sheen 03!01102 57000 12000 1200 1400 6100 <500 na na na na na na na na 57.62 -33.56 odorino sheen 05120/02 53000 11000 1500 1300 6200 <50 c50 c50 <50 <500 c5000 c500 c51) <a 57.91 32'20 odorino sheen 08!30102 51000 9900 3200 1300 6100 <500 na na na na na na na na 60.95 27.44 -30.47 no odor/no sheen 12/06/02 29000 6400 580 770 3300 <25 na na na na na na na na 61.08 -33.51 odorino sheen 03107103 43000 10000 770 1300 4400 <500 na na na na na na na na 60.28 -33.64 odorino sheen 06103103 11000 2200 290 310 960 <10 <10 <10 <10 <100 <1000 < -32.84 odorino sheen 100 2i <10 59.09 -31.65 odor/no sheen 474gmr00.A5 PrIed No.1474.44 Page 1 of 8 HORIZON ENVIRO1 NXNTAL INC.