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• A TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPI-Ig enzene toluene benzenexylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDS GW Elevation Elevation Number Date u 1L) (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L u IL (u IL) u 1L) (u 1L) (u IL (ug/L (ug/ feet feet msl feet msl Comments MW-4 03131/98 ns ns ns ns ns ns ns ns ns ns ns ns nm 25.15 nm not located screened 06110/98 ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located 65'-86' 12130/98 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 08130!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 12/10/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 06/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 09/28100 <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 MWS 03/31/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.11 25.11 -36.00 screened 06!10198 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.41 -33.30 no odor 1 no sheen interval 09108/98 <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!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 I no sheen 03125!99 <50 <0.50 <0.50 <0.50 <0.50 <0.511 <0.50 <0.50 <0.50 <5.0 <50 <5.0 54.54 -29.43 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 53.89 -28.78 no comment 08/30/99 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 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 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 06/22100 <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 MW-6 03/31/98 78,000 23,000 8500 1100 6300 <500 na na na na na na 61.43 25.44 -35.99 reported as MW-2A screened 06/10/98 120,000 23,000 17,000 1600 15,000 <500 na 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 <50 <5.0 58.77 -33.33 odor 1 no sheen 56'-76' 12/30198 71,000 20,000 6500 1900 11,000 <250 na na na na na na 56.85 -31,41 slight odor I no sheen 03/25/99 48,000 15,000 1800 910 5100 <0.50 <0.50 <0.50 <0.50 20 <50 56 54.86 -29.42 no comment 06/03/99 33,000 9600 2500 1100 5400 <5.0 <5,0 <5.0 <5.0 <50 <500 <50 <5.0 10 54.14 -28.70 no comment 08/30/99 51,000 7200 5400 2400 11,000 42 <20 <20 <20 <200 <2000 <200 32 56 56.32 -30.88 no comment 12/10/99 67,000 13,000 2400 1800 9500 <20 <20 <20 <20 <200 <50 <200 68 46 56.29 -30.85 no comment 03103100 28,000 6000 280 570 3600 <20 <20 <20 <20 <200 <50 <200 <20 <20 54.89 -29.45 no odor/no sheen 06/22100 26,000 6500 570 710 2900 <10 <10 <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 odorfno sheen 474gmr00.x]s 1474.43 Page 2 of 5 HORIZON ENVIRONMENTAL INC.