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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 TPH9 benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (uglL) (ug1L) (ug1L) (ug]L) l(ug[L)(uglL (feet) (feet msl) (feet ms]) Comments VW-2 03/03100 as ns ns as ns ns ns ns as ns nm as ns ns nm nm nm dry screened 06122100 ns as ns• ns as ns as ns as as as as as as nm nm dry Interval 09/28100 as ns ns ns as ns ns ns as as ns as ns as nm nm dry 37-47' 12122/00 as as ns as ns ns ns ns ns as ns ns ns ns nm nm dry 03!26!01 as as ns ns as ns ns ns ns as as as as as am nm dry 06127/01 as as ns as ns as ns ns ns as as as ns as am nm dry 09106!01 as as ns ns ns ns ns ns ns as ns as ns as nm nm dry 12104/01 as as ns ns as ns ns as ns as ns as ns AS nm nm dry 03101/02 as as as as ns as ns ns ns as ns ns as ns nm nm dry 05120102 as as ns as ns as ns ns ns as as ns as ns nm nm dry VW-3 03103/00 as as as as ns ns ns as ns as nm as ns as am nm nm dry screened 06/22/00 as ns as ns as ns as as ns as as ns ns ns nm nm dry Interval 09128!00 ns as as ns as ns ns as ns as ns as ns ns nm nm dry 23-33' 12/22/00 as ns as ns as ns ns ns as ns ns as ns ns nm nm dry 03128101 n$ ns ns ns ns ns as ns as ns ns ns as ns nm nm dry 06127101 ns ns as ns ns ns ns ns as ns as as ns ns nm nm dry 09/06/01 as as as as ns n$ ns as ns ns as as ns ns am nm dry 12104101 as as as as ns n$ ns as ns ns as as ns ns am nm dry 03/01/02 as as ns as as as as as ns AS as as ns ns nm nm dry 05/20/02 as ns ns ns as ns as ns ns n$ ns ns ns ns nm nm dry VW4 09!08198 86000 19000 6900 3100 20000 1.4 <0.50 <0.50 -40.50 <5.0 74.0 <5.0 na. no 59.10 nm am strong odor/no sheen screened 12130198 79000 29000 1600 3700 16000 <100 no no no no no no no no 57.28 nm petrol.odor/no sheen Interval 03125!99 89000 14000 2700 3200 13000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 no no 55.23 nm no comment 50'-65' 06/03/99 39000 10000 1600 2900 11000 <0.50 <0.50 <0.50 -40.50 <5.0 <50 <5.0 930 120 54.44 nm no comment 08/30199 50000 9200 1500 3500 12000 B6 <20 <20 <20 <200 <2000 -4200 850 64 56.53 nm no comment 12/10199 64000 9300 2200 2800 9700 <20 <20 <20 <20 <200 <10000 -200 710 42 56.61 nm no comment 03/03/00 ns as as as ns as ns ns as ns ns ns ns as am nm dry 06122700 ns as as as ns as ns as as ns ns ns ns ns nm nm dry OWN= as as as as ns as ns as as ns ns ns ns ns nm am dry 12/22/00 55000 6,400 1600 3200 5400 <200 no no no no na no no no 56.01 nm odoTIno sheen 03128/0141000 5200 2000 2700 4600 <200 no na no no no no no no 55.00 nm odor 1 no sheen 06127/01 28000 5000 580 3000 1900 <20 <20 <20 <20 <200 <2000 <200 370 <20 56.42 nm odor Ino sheen 09106/1 28000 2900 410 2800 840 <100 no no na no no no na no 58.45 nm odor!no sheen 12104/01 22000 2000 550 2400 1200 -4100 no no no no no na no no 59.10 nm odor no sheen 03101/02 20000 1900 110 2500 1400 <100 no no no no no no no na $7.95 am odor Ino sheen 05120102 18000 1300 430 2000 1600 <10 <10 <10 <10 <100 -41000 <100 130 <10 58.09 27.74 -30.35 no odor Ino sheen 08/30102 200W 1500 460 2300 1300 <100 na no no no no no na na 61.04 -33.30 odor 1 no sheen fojed o.14 Page 7 of 8 HORIZON ENVIRONMENTAL INC. Project No.1�7�.�4