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<br />0 <br />r? <br />?d <br />Addendum to Geotechnical Data Report <br />Bowie Resources, Limited <br />July 2002 <br />during our investigation is generally based on criteria developed by the U.S. Bureau of <br />Reclamation (USBR) and those presented in the Geotechnical Data Report (GEI 2001). <br />Boring logs are presented Appendix A. <br />2.3 Piezometer Installations <br />Single-level, open standpipe piezometers were installed in Borings BL-101A and BL-102 by <br />Heliport Drilling under the observation of GEI's field engineer. <br />The piezometers consist of nominal 3/-inch, Schedule 40, PVC pipe. A 5-foot-long section <br />of the PVC pipe is slotted and surrounded by sand to create a zone of influence over which <br />groundwater can flow into the piezometer. The top of the influence zone is sealed by at least <br />2 feet of bentonite. Portland cement is used to backfill the borehole above the bentonite to <br />the ground surface. A 6-inch-diameter, flush-mount surface casing is installed at the top of <br />the piezometer. Details for a single-level open standpipe piezometer are shown on Figure 3. <br />A summary of the piezometer installations and influence zones is presented in Table 2.2 and <br />the influence zones are shown in section on Figure 6. Logs of piezometer installations are <br />provided in Appendix A. <br />TABLE 2.2 <br />GROUNDWATER OBSERVATION WELLS INSTALLATION INFORMATION <br /> Approximate Well Depths (feet) <br /> Elevation at Depth to <br />Boring Ground Bottom of Screen Bottom of Top of Top of <br />Number Surface Boring Interval Sand Sand Bentonite <br /> (feet) <br />BL-101A 8230 29.5 16.5-11.5 18.0 10.0 9.0 <br />BL-102 8209 34.5 17.5-22.5 24.5 16.5 15.5 <br />2.4 Inclinometer Installations <br />Inclinometers were installed in two borings, BL-IOTA and Bo-102A, by Heliport Drilling <br />under the observation of GEI's field engineer. <br />The inclinometers consist of nominal 3/8-inch galvanized steel cable and a %-inch coaxial <br />cable encased in Portland cement. Above the top of the estimated failure zone, the <br />galvanized steel cable is encased in a 3/-inch-diameter schedule 40 PVC sheath. A11/2-inch- <br />diameter by 3-foot-long steel bolt is attached to the bottom of the galvanized steel cable. The <br />purpose of the bolt was to keep the galvanized steel cable in tension during construction of <br />the inclinometer. Except where the galvanized steel cable is encased in the PVC sheath, <br />GEI Consultants, Inc. <br />99292 02-07-03 Addendum Geotechnical Data Rpt