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TABLE 2 GROUNDWATER LEVEL DATA ARCO Service Station No 6100 25775 Patterson Pass Road Tracy,California fop of Casing Depth to Total Depth Floating Product Groundwater Well Date Elevation i Groundwater of Well I Thickness Elevation ID Measured feet msl feet b s (feet b s) (feet (feet ms]) VW 16 10/3/00 NM 5800 5900 12/27/00 5840 12/29/00 5840 217/01 5860 8120/01 58 10 « 3/25/02 58 13 « 6/20/02 5823 « VW-17 10/3/00 28926 Dry 10200 Dry 12/27/00 Dry Dry 12/29/00 Dry Dry. 2/7/01 Dry Dry, 8120101 Dry Dry 3/25/02 Dry Dry 6/20/02 Dry pry VW-18 1013100 27441 Dry 7300 Dry 12/27/00 Dry Dry, 12/29/00 Dry Dry 217/01 Dry Dry 8/20/01 7295 + 3/25/02 7295 + 6/20/02 7293 + VW 19 10/3/00 27633 Dry 88 00 Dry 12/27/00 Dry Dry 12/29/00 Dry Dry 2/7/01 Dry Dry, 8/20/01 Dry Dry 3/25102 Dry Dry 6/20102 Dry Dry VW-20 10/3/00 275 08 7779 7900 12/27/00 7776 12/29/00 7777 217/01 Dry Dry 8/20/01 Dry Dry 3/25/02 7770 + 6/20/02 7764 ms]=mean sea level bgs=below ground surface I Top of casing elevations surveyed October 2001 by Morrow Surveying Z Well MW-1 is monitored on a weekly basis,and free product is measured and removed, see Table I for additional information/details 'As measured during sampling Casing Cut 0 12 feet on 3/25102 due to a crack in the PVC Casing elevation not re-surveyed Field technician noted"dirt in casing" *Water observed in well is less than 1 0 ft and does not appear to be groundwater from surrounding formation, well interpretted to be dry "*Groundwater elevations corrected for the presence of floating product as follows (top of casing elevation depth to water+(0 7 x product thickness)) Arco-6100 Ouarterly_Data xls Page 6 of 6