10.1. SR 01-22-2013 - Laserfiche WebLink

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Appendix B Geotechnical Report Limitations and Guidelines for Use AET Project No.26-04535 B.2.5 Most Geotechnical Findings Are Professional Opinions Site exploration identified subsurface conditions only at those points where subsurface tests are conducted or samples are taken. Geotechnical engineers review field and laboratory data and then apply their professional judgment to render an opinion about subsurface conditions throughout the site. Actual subsurface conditions may differ, sometimes significantly, from those indicated in your report. Retaining the geotechnical engineer who developed your report to provide construction observation is the most effective method of managing the risks associated with unanticipated conditions. B.2.6 A Report's Recommendations Are Not Final Igo not overrely on the construction recommendations included in your report. Those recommendations are not final,because geotechnical engineers develop them principal€y from judgment and opinion. Geotechnical engineers can finalize their recommendations only by observing actual subsurface conditions revealed during construction. The geotechnical engineer who developed your report cannot assume responsibility or liability for the report's recommendations if that engineer does not perform construction observation. 5.2.7 A Geotechnical Engineering Report Is Subject to Misinterpretation Other design team members' misinterpretation of geotechnical engineering reports has resulted in costly problems. Lower that risk by having your geotechnical engineer confer with appropriate members of the design team after submitting the report. Also retain your geotechnical engineer to review pertinent elements of the design team's plans and specifications. Contractors can also misinterpret a geotechnical engineering report. Reduce that risk by having your geotechnical engineer participate in prebid and preconstruction conferences,and by providing construction observation. B.2.8 Do Not Redraw the Engineer's Logs Geotechnical engineers prepare final boring and testing logs based upon their interpretation of field logs and laboratory data. To prevent errors or omissions,the logs included in a geotechnical engineering report should never be redrawn for inclusion in architectural or other design drawings. Only photographic or electronic reproduction is acceptable, but recognize that separating logs from the report can elevate risk. B.29 Give Contractors a Complete Report and Guidance Some owners and design professionals mistakenly believe they can snake contractors liable for unanticipated subsurface conditions by limiting what they provide for bid preparation_ To help prevent costly problems,give contractors the complete geotechnical engineering report,but preface it with a clearly written letter of transmittal. In the letter,advise contractors that the report was not prepared for purposes of bid development and that the report's accuracy is limited, encourage them to confer with the geotechnical engineer who prepared the report(a modest fee may be required) and/or to conduct additional study to obtain the specific types of information they need or prefer. A prebid conference can also be valuable. Be sure contractors have sufficient time to perform additional study. Only then might you be in a position to give contractors the best information available to you, while requiring them to at least share some of the financial responsibilities stemming from unanticipated conditions. B.2.10 Read Responsibility Provisions Closely Some clients,design professionals,and contractors do not recognize that geotechnical engineering is far less exact than other engineering disciplines. This lack of understanding has created unrealistic expectations that have led to disappointments, claims, and disputes. To help reduce the risk of such outcomes, geotechnical engineers commonly include a variety of explanatory provisions in their report. Sometimes labeled"limitations"many of these provisions indicate where geotechnical engineers'responsibilities begin and end,to help others recognize their own responsibilities and risks. head these provisions closely. Ask questions. Your geotechnical engineer should respond fully and frankly. $.2.11 Geoenvironmental Concerns Are Not Covered The equipment, techniques, and personnel used to perform a geoenvironmenta€study differ significantly 6rom those used to perform a geotechnical study. For that reason, a geotechnical engineering report does not usually relate any geoenvironmental findings,conclusions,or recommendations;e.g.,about the likelihood of encountering underground storage tanks or regulated contaminants. Unanticipated environmental problems have led to numerous project failures. If you have not yet obtained your own geoenvironmental information, ask your geotechnical consultant for risk management guidance. Do not rely on an environmental report prepared for someone else. Appendix B—Page 2 of 2 AMERICAN ENGINEERING TESTING,INC