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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 3440 East Main Street,Stockton,California I ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanolethanol EDC EDB GW Elevation Elevation Number Date (ug/L u 1L u !L u IL u 1L u 1L u 1L) u 1L u IL u IL u !L u 1L u 1L u 1L feet feet msl feet ms]) Comments MWS 03!31198 ns ns ns ns ns ns ns ns ns ns ns ns nm 25.15 nm not located screened 06!10198 ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located interval 09/08198 ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located 65'-86' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 08/30/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 12110/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 03103!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 06122100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.16 -31.01 no odor/no sheen 12121!00 <50 <0.50 <0,50 <0.50 <0.50 <5.0 na na na na na na na na 55.28 -30.13 no odor/no sheen MW-5 03/31/98 <50 <D.50 <0.50 <0.50 <0.5D <5.0 na na na na na na 61.11 25.11 -36.00 screened 06!10198 <50 <0.50 <0.50 <0.5o <0.50 <5.0 na na na na na na 58.41 -33.30 no odor 1 no sheen interval 09108198 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 58.41 -33.30 no odor I no sheen 65'-86.5' 12/30/98 <50 <0.50 2.5 0.89 5.8 <5.0 na na na na na na 56.51 -31.40 no odor!no sheen 03!25199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5,0 54.54 -29.43 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 53.89 -28.78 no comment 08!30199 95 1.7 7.4 2.1 15 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.04 -30.93 no comment 42/10/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5D <0.50 <5.0 <50 <5.0 <0.50 <0,50 55.99 -30.88 no comment 03/03/00 <50 <0.50 0.51 <0.50 0.92 <0.50 <0.50 <0.50 <0.50 <5.0 <50 6.0 <0.50 <0.50 54.53 -29.42 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 24 <0.50 <0.50 53.75 -28.64 no odor/no sheen 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.19 -31.08 no odor/no sheen 12/21/00 <50 <0.50 <0.50 <0,50 <0.50 <5.0 na na na na na na na na 55.32 -30.21 no odortno sheen MW-6 03131/98 78,000 23,000 8500 1100 6300 <500 na na na na 7na na 61.43 25.44 -35.99 reported as MW-2A screened 06/10/98 120,000 23,000 17,000 1600 15,000 <5o0 na na na na na 58.69 -33.25 reported as MW-2A interval 09108/98 120,000 30,000 20,000 2300 18,000 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 58.77 -33.33 odor I no sheen 56'-76' 12/30/98 71,000 20,000 6500 1900 11,000 <250 na na na na na 56.85 -31.41 slight odorInosheen 03125!99 48,000 15,000 1800 910 5100 <0.50 <0.50 <0.50 <0.50 20 56 54.86 -29.42 no comment 06!03199 33,000 9600 2500 1100 5400 <SA <5.0 <5.0 <5.0 <50 <50 <5.0 10 54.14 -28.70 no comment 08130/99 51,000 720D 5400 2400 11,000 42 <20 <20 <20 <200 <2000 <200 32 56 56.32 -30.88 no comment 12110/99 67,000 13,000 2400 1800 9500 <20 <20 <20 <20 <200 <50 <200 68 46 56.29 -30.85 no comment 03103/00 28,000 6000 280 570 3600 <20 <20 <20 <20 <200 <50 <200 <20 <20 54.89 -29.45 n0 odor/no sheen 06/22/00 26,000 6500 570 710 2900 <10 <iD <10 <10 <100 <1000 <100 <10 <10 54.11 -28.67 slight odor 1 no sheen 09128!00 30,000 920 5300 830 6900 <5.0 na na na na na na na na 56.47 -31.03 slight odorino sheen 12122/00 55,000 9600 950 1600 8300 <200 na na na na na na na na 55.72 -30.28 odor I no sheen 1 474gmr00.x1s 1474.43 Page 2 of 5 HORIZON ENVIRONMENTAL INC.