Laserfiche WebLink
Geotechnical Data Report Bruce Park Dam <br />Bowie Resources, Limited <br />April 2001 <br />3.3.3 Packer Testing Procedures <br />During drilling in bedrock, packer pressure testing was attempted in Boring BD-102 <br />to determine the apparent hydraulic conductivity of the rock mass. A positive seal <br />could not be maintained in the borehole and the test was abandoned. No further <br />packer testing was attempted. <br />3.4 Piezometer Installations <br />Single-level, open standpipe piezometers were installed in five borings. Piezometers were <br />installed by Agapito Drilling, Inc. under the observation of GEI's field engineer. Open <br />standpipe piezometers were installed in Borings BD-101, BD-103, BD-105, BD-105A, and <br />BS-102. <br />The piezometers generally consist of nominal 1.5-inch, Schedule 40, PVC pipe. The PVC <br />pipe is slotted and surrounded by graded sand to create a zone of influence over which <br />10) groundwater can flow into the piezometer. The top of the influence zone is sealed by at least <br />2 feet of bentonite. Non-shrink cement-bentonite grout or bentonite chips are used to backfill <br />the borehole to within 2 feet of the ground surface. Eight-inch-diameter, flush-mount surface <br />casings, embedded in 2 feet of concrete are installed along the crest of the dam where snow <br />mobile traffic is expected. A 5-foot-long, 4-inch-square steel casing embedded in 2 feet of <br />concrete was used at BD-103. A summary of the piezometer installations and influence <br />zones is presented Table 1 and the influence zones are shown in cross-section on Figures 4 <br />and 5. Logs of piezometer installations are provided in Appendix B. <br />Where piezometers were not installed, Borings BD-102 and BS-104, the borings were <br />backfilled to the ground surface with non-shrink, cement-bentonite grout upon completion of <br />drilling and testing. <br /> <br />GEI Consultants, Inc. 6 99292 et=.a.16 GeoteMmcat Data Repor: