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+ w 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 Dateu /L (u/L (ug/L (ug/L (ug/L (ug/L u /L u /L ug/L)( (ug/L (ug/L (ug/L (u/L (ug/L feet feet msl feet msl Comments VW-1 09/08/98 170000 36000 47000 3300 24000 0.70 <0.50 <0.50 <0.50 <5.0 61 6.8 58.88 nm nm strong odor I no sheen screened 12/30/98 190000 34000 49000 3300 24000 <1000 na na na na na na 57.10 nm odor/no sheen interval 03/25/99 260000 37000 55000 4800 32000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 55.05 nm no comment 50'-65' 06/03/99 120000 20000 26000 3500 23000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 140 520 54.19 nm no comment 08/30/99 130000 25000 46000 3900 25000 <50 <50 <50 <50 <500 <5000 <500 160 620 56.28 nm no comment 12/10/99 200000 22000 35000 3300 23000 <100 <100 <100 <100 <1000 <10,000 <2000 160 590 56.42 nm no comment 03/03/00 180000 23000 36000 2500 18000 <100 <100 <100 <100 <1000 <20,000 <1000 1500 5800 55.63 nm no odor/no sheen 06/22/00 190000 23000 39000 3200 22000 <100 <100 <100 <100 <1000 <10,000 <1000 130 540 54.16 nm no odor/no sheen 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm ` 12/22/00 190000 29000 42000 2900 20000 <2000 na na na na na na na na 55.82 nm odor/no sheen 03/28/01 180000 36000 40000 4900 20000 <500 na na na na na na na na 54.93 nm odor/no sheen 06127/01 190000 28000 40000 3900 24000 <200 <200 <200 <200 <2000 <20000 14000 290 730 56.43 nm odor/no sheen 09/06/01 230000 36000 43000 3300 20000 <2000 na na na na na na na na 58.60 nm odor lno sheen 12/04/01 200000 32000 41000 3500 23000 <1000 na na na na na na na na 58.91 nm no odor/no sheen 03/01/02 230000 29000 37000 3700 24000 <2000 na na na na na na na na 57.74 nm slight odor/ sheen 05/20/02 220000 32000 41000 3600 23000 <200 <200 <200 <200 <2000 <20000 <2000 <200 <200 57.86 27.51 -30.35 no odor/no sheen VW-2 03/03/00 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 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 3747' 12/22/00 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 09/06/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/04/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05/20/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW-3 03/03/00 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 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 23-33' 12/22/00 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 09/06/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12/04/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 05/20/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VWd 09/08/98 86000 19000 6900 3100 20000 1.4 <0.50 <0.50 <0.50 <5.0 74.0 <5.0 59.10 nm nm strong odor/no sheen screened t2/30/98 79000 29000 1600 3700 16000 <100 na na na na na na 57.28 nm petrol.odor/no sheen Interval 03/25/99 89000 14000 2700 3200 13000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 55.23 nm no comment 50'-65' 06/03/99 39000 10000 1600 2900 11000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 54.44 nm no comment 08/30/99 50000 9200 1500 3500 12000 86 <20 <20 <20 <200 <2000 <200 850 64 56.53 nm no comment 12/10/99 64000 9300 2200 2800 9700 <20 <20 <20 <20 <200 00000 <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 55000 6400 1600 3200 5400 <200 na na na na na na na na 56.01 nm odor/no sheen 03/28/01 41000 5200 2000 2700 4600 <200 na na na na na na na na 55.00 nm odor no sheen 06/27/01 28000 50W 580 3000 1900 <20 <20 <20 <20 <200 <2000 <200 370 <20 56.42 nm odor no sheen 09/06/01 26000 2900 410 2800 840 <100 na na na na na na na na 58.45 nm odor/no sheen 12/04/01 22000 2000 550 2400 1200 <100 na na na na na na na na 59.10 nm odor/no sheen 03/01/02 20000 1900 110 2500 1400 <100 na na na na na na na na 57.95 nm odor/no sheen 05/20/02 18000 1300 430 2000 1600 <10 <10 <10 00 000 <1000 <100 130 <10 58.09 27.74 -30.35 no odor/no sheen 474gmr00.x1s Project No.1474.44 Page 6 of 7 HORIZON ENVIRONMENTAL INC.