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TABLE 1 WELL CONSTRUCTION DETAILS Ernie's General Store 4407 East Waterloo Road, Stockton, California Installation Borehole Total Casing Casing Slot Size Filter Casing Elevation Screen Filter Pack Bentonite Grout Well ID Diameter Depth Diameter Interval Interval Interval Interval Date (inch) (feet) (inch) Material (inch) Pack (feet NAVD88) (feet bsg) (feet bsg) (feet bsg) (feet bsg) Ground Water Monitoring Wells MW-1 07-28-2003 8 85 2 PVC 0.020 #3 33.25 65 to 85 63 to 85 60 to 63 0 to 60 • MW-2 07-29-2003 8 85 2 PVC 0.020 #3 33.08 65 to 85 63 to 85 60 to 63 0 to 60 MW-3 07-30-2003 8 85 2 PVC 0.020 #3 33.06 65 to 85 63 to 85 60 to 63 0 to 60 MW-4 07-28-2003 8 85 2 PVC 0.020 #3 33.32 65 to 85 63 to 85 60 to 63 0 to 60 MW-5 12-14-2006 8 80 2 PVC 0.020 #3 32.84 60 to 80 58 to 80 56 to 58 1 to 56 Remediation Wells VW-1 12-12-2006 8 60 2 PVC 0.020 #3 - 45 to 60 43 to 60 41 to 43 1 to 41 VW-2 12-12-2006 8 30 2 PVC 0.020 #3 - 15 to 30 13 to 30 11 to 13 1 to 11 VW-3 12-13-2006 8 60 2 PVC 0.020 #3 - 45 to 60 43 to 60 41 to 43 1 to 41 VW-4 12-13-2006 8 30 2 PVC 0.020 #3 - 15 to 30 13 to 30 11 to 13 1 to 11 VW-5 12-13-2006 8 30 2 PVC 0.020 #3 - 15 to 30 13 to 30 11 to 13 1 to 11 VW-6 12-15-2006 8 60 2 PVC 0.020 #3 - 45 to 60 43 to 60 41 to 43 1 to 41 Notes: NAVD88: North American Vertical Datum 88 bsg: below surface grade 1:Survey completed by Morrow Surveying of West Sacramento on 01-26-2007 via coordinate datum NAD83(1986)and vertical datum NAVD88 from GPS observations. All calculations 08-18- • 2005 to 05-04-2006 utilize 09-07-2005 survey. MW:monitoring well VW:vapor extraction well Advanced GeoEnvironmental,Inc.