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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 TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) ug1L (feet) (feet msl) (feet msl) Comments VW-2 03103/00 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry screened 06/22/00 ns, ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 09028/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 3747' 12!22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry I VW-3 03/03100 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry screened 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry Interval 09/28100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03!28101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-4 09108/98 86,000 19,000 6900 3100 20,000 1,4 <0.50 <0.50 <0.50 <5.0 74.0 <5.0 59.10 nm nm strong odorino sheen screened 12/30/98 79,000 29,000 1600 3700 16,000 <100 na na na na na na 57.28 nm petrol.ododno sheen interval 03/25/99 89,000 14,000 2700 3200 13,000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 55.23 nm no comment 50'-65' 06/03/99 39,000 10,000 1600 2900 11,000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 54.44 nm no comment 08/30/99 50,000 9200 1500 3500 12,000 86 <20 <20 <20 <200 <2000 <200 850 64 56.53 nm no comment 12/10/99 64,000 9300 2200 2800 9700 <20 <20 <20 <20 <200 <10.000 <200 710 42 56.61 nm no comment 03/03/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/22/00 55,000 6400 1600 3200 5400 <200 na na na na na na na na 56.01 nm odor/no sheen 03/28/01 41,000 5200 2000 2700 4600 <200 na na na na na na na na 55,00 nm odor!no sheen 06/27/01 28,000 5000 580 3000 1900 <20 <20 <20 <20 <200 <2000 <200 370 <20 56.42 nm odor/no sheen I I I E I 474gmr0Q.r1s Project No.1474.44 Page 5 of 6 HORIZON ENVIROZMENTAL INC.