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TABLE 1 Well Construction Details ARCO Service Station No. 4932 16 East Harding Way, Stockton, CA Boring Borehole Casing Screened Filter Pack Bentonite Seal Cement Seal Elevation Slot Size Well I.D. Construction Date (TOC feet) Depth Diameter Diameter Casing Material (inches) Interval Interval Interval Interval Comments (feet bgs) (inches) (inches) (feet bgs) (feet bgs) (feet bgs) (feet bgs) Groundwater Monitoring Wells(MW and DMW) MW-1 8/21/2000 11.49 41.5 10 4 Sch.40 PVC 0.020 10-40 8-40 5-8 0-5 A Zone MW-2 8/21/2000 12.01 41.5 10 4 Sch.40 PVC 0.020 10-40 8-40 5-8 0-5 AZone MW-3 8/22/2000 11.08 41.5 10 4 Sch.40 PVC 0.020 10-40 8-40 5-8 0-5 A Zone MW-4 8/22/2000 10.88 41.5 10 4 Sch.40 PVC 0.020 5-40 3-40 2-3 0-2 A Zone MW-5 7/13/2001 11.2 40.5 8 2 Sch.40 PVC 0.020 20-40 18-40 16-18 0-16 A Zone MW-6 7/13/2001 10.83 40.5 8 2 Sch.40 PVC 0.020 20-40 18-40 16-18 0-16 A Zone MW-7 7/13/2001 10.35 40.5 8 2 Sch.40 PVC 0.020 20-40 18-40 16-18 0-16 A Zone MW-8 7/13/2001 12.38 40.5 8 2 Sch.40 PVC 0.020 20-40 18-40 15-18 0-15 A Zone MW-9 7/13/2001 10.83 40.5 8 2 Sch.40 PVC 0.020 20-40 18-40 16-18 0-16 A Zone MW-10 6/10/2002 10.72 41 8 2 Sch.40 PVC 0.020 20-40 18-41 15.5-18 0-15.5 A Zone MW-11 6/10/2002 10.52 40.5 8 2 Sch.40 PVC 0.020 20-40 18-40.5 16-18 0-16 A Zone DMW-1 3/14/2002 11.34 81 8 2 Sch.40 PVC 0.020 75-80 73-81 70-73 0-70 B Zone DMW-2 6/11/2002 10.48 82.5 8 2 Sch.40 PVC 0.020 77-82 75.5-82.5 72.5-75.5 0-72.5 B Zone DMW-3 6/12/2002 10.84 83.5 8 2 Sch.40 PVC 0.020 77-82 75.5-83.5 72.5-75.5 0-75.5 B Zone DMW-4 1/16/2008 11.12 72 6 2 Sch.40 PVC 0.020 60-70 58-70.5 54-58 0-54 B'Zone DMW-5 1/14/2008 12.27 71 6 2 Sch.40 PVC 0.020 60-70 58-71 54-58 0-54 B'Zone DMW-6 1/9/2008 11.28 75 6 2 Sch.40 PVC 0.020 55-75 53-75 51-53 0-51 B'Zone DMW-7 1/8/2008 10.76 75 6 2 Sch.40 PVC 0.020 55-75 53-75 51-53 0-51 B'Zone DMW-9 1/11/2008 10.32 71 6 2 Sch.40 PVC 0.020 60-70 58-70 55-58 0-55 B'Zone DMW-10 2/12/2008 12.2 70 6 2 Sch.40 PVC 0.020 59.5-69.5 57.5-69.5 53.5-57.5 0-53.8 B'Zone Extraction Wells(EW) EW-1 3/15/2002 10.96 44 - 6 SS 0.020 21-41 19-42 17-19 0-17 AZone EW-2 6/13/2002 11.05 50 12 6 SS 0.020 20-40 18-41 16-18 0-16 A Zone EW-3 8/5/2003 10.33 41 - 6 SS 0.020 20-40 18-41 16-18 0-16 AZone EW-4 8/6/2003 10.72 41 - 6 SS 0.020 21-41 19-41 17-19 0-17 A Zone EW-5 8/6/2003 10.79 41 - 6 SS 0.020 21-41 19-41 17-19 0-17 A Zone EW-6 11/13/2002 10.65 40 - 6 SS 0.020 15-35 13-35 11-13 0-11 A Zone EW-7 8/7/2003 10.12 43 - 6 SS 0.020 21.5-41.5 19.5-43 17.5-19.5 0-17.5 AZone Vapor Extraction Wells(SVE) SVE-1 8/22/2000 10.94 30.5 10 2 Sch.40 PVC 0.020 5-30 4-30 2-4 0-2 AZone SVE-2 8/6/2003 11.1E 30 - 2 Sch.40 PVC 0.020 5-30 4.5-30 3.5-4.5 0-3.5 AZone 1 of 2