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TABLE 1 Well Construction Details ARCO Service Station No.2133 and Chevron Service Station No.9-4275 2908 2905 West Benjamin Holt Drive Stockton,California Boring Cement Elevation Borehole Casing Screened Filter Pack Well I.D. Constructlon (TOC feet Depth Diameter Diameter Casing Slot Size Interval(feet Interval(feat Bentonite Seal Seal Comments Date MSL) (feet (Inches) (Inches) Material (inches) bgs) bgs) Interval(feet bgs) Interval b g feet bgs HVON Monitoring Wells MW-1 2/28/89 36.5 11 4 PVC 0.020 8-32 6-32 5-6,32-36.5 0-5 Destroyed May 2005 MW-2 2/27/89 34 11 4 PVC 0.020 17-31.5 15-31.5 13.5-15,31.5-34 0-13.5 Destroyed May 2005 MW-3 2/28/89 31.5 11 4 PVC 0.020 17-28 15.5-28 14.5-15.5,28-31.5 0-14.5 Destroyed May 2005 MW-4 3/1-3/2/1989 33.5 11 4 PVC 0.020 16-30 15-30 14-15,30-33.5 0-14 Destroyed May 2005 MW-5 3/1/89 28.5 11 4 PVC 0.020 8-28 7-28 6-7,28-28.5 0-6 Destroyed May 2005 MW-6 3/3/92 2.50 31.5 8 2 PVC 0.020 10-30 8-31.5 6-8 0-6 MW-7 3/3/92 - 31.5 8 2 PVC 0.020 10-30 8-31.5 6-8 0-6 Destroyed May 2005 MW-8 12/13/93 2.26 31.5 8 2 PVC 0.020 10-30 9-31.5 7-9 0-7 MW-9 6/20/94 - 31.5 8 2 PVC 0.020 10-30 8-31.5 6-8 0-6 Destroyed May 2005 MWAR 3/1/06 3.47 60 6 2 PVC 0.010 5-20 4-23 3-4,23-25 0-3,25-60 MW-2R 2/27/06 4.07 65 6 2 PVC 0.010 5-20 4-23 3-4,23-25 0-3,25-65 MW-3R 2/28/06 4.02 59 6 2 PVC 0.010 5-20 4-23 3-4,23-25 0-3,25-65 MW-5R 6/5/06 4.49 20 4.25 2 PVC - 5-20 4-20 2-4 0-2 MW-7R 6/5/06 4.13 20 4.25 2 PVC 5-20 4-20 2-4 0-2 MW-9R 6/5/06 2.76 20 4.25 2 PVC 5-20 4-20 2-4 0-2 MW-10 6/11/07 2.95 20 4.25 2 PVC 0.020 5-20 4-20 2-4 0-2 Remediation Wells GM-1 11/13/96 28 10 2 PVC 0.020 9-17,25-28 9-18,24.5-28 8.5-9,18-24.5 0-8.5 Destroyed May 2005 GM-2 11/14/96 28 10 2 PVC 0.020 10-17,26-28 9.5-18,25-28 9-9.5,18-25 0-9 Destroyed May 2005 GM-3 11/18/96 28 10 2 PVC 0.020 10-17,26-28 9-18,25-28 8.5-9,18-25 0-8.5 Destroyed May 2005 GM-4 11/14/96 28.5 10 2 PVC 0.020 10-17,26-28.5 9-18,25-28.5 8.5-9,18-25 0-8.5 Destroyed May 2005 GM-5 1/24/97 30 10 2 PVC 0.020 10-17,27-30 9.5-18,26-30 8.5-9.5,18-26 0-8.5 Destroyed May 2005 GM-6 11/18/96 28.5 10 2 PVC 0.020 10-17,26-28.5 8.5-9.5 8.5-9.5,25.5-28.5 0-8.5 Destroyed May 2005 GM-7 11/15/96 30 10 2 PVC 0.020 10-17,28-30 9-18,27-30 8.5-9,18-27 0-8.5 Destroyed May 2005 GM-8 11/15/96 29 10 2 PVC 0.020 10-17,27-29 9-18,26-29 8-9,18-26 0-8 Destroyed May 2005 GM-9 1/24/97 29.5 10 2 PVC 0.020 10-17,26-29.5 9-18,25.5-29.5 8.5-9,18-25.5 0-8.5 Destroyed May 2005 VW-1 3/3/92 20 8 2 PVC - 12.5-17.5 10-20 8-10 0-8 Destroyed May 2005 R-1 10/1/88 - - - PVC 848 - - Destroyed AS-8 2/23/06 65 6 PVC - 0-65 AS-9 2/24/06 67.5 6 PVC 0-65 AS-10 2/27/06 63 6 PVC 0-63 AS-11 312/06 25 6 PVC 0-25 Soil ori gs SBA 6/20/94 21.5 8 0 21.5 SB-2 6/20/94 21.5 6 0-21.5 SB-3 6/20/94 18.5 6 0-18.5 SB-4 6/20/94 18.5 6 0-18.5 Notes: bgs=below ground surface TOC=top of casing PVC=polyvinyl chloride MSL=mean sea level Sch.=Schedule Filter Pack is with#3 sand -=Not Available/Not Applicable Well Construction Details.xls 2 of 2 SECOR