Guidelines for Managing Geotechnical Risks in Design–Build Projects (2018) / Chapter Skim
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3 The purpose of these guidelines is to assist public agencies in manag ing geotechnical risk on highway construction projects that are deliv ered using design–build (DB)
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4 Guidelines for Managing Geotechnical Risks in Design–Build Projects • Nevertheless, DOTs continue to rely on exculpatory language to attempt to shed geotechnical risk in DB projects. • The industry recognizes the risk shedding bias and perceives geotechnical risk to be much higher than do authors of DOT DB RFPs.
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Introduction to Design–Build Geotechnical Risk Management 5 subsurface risks will be the first to be realized in construction, it makes sense to give the sub surface risks specific attention both before and after DB contract award. Additionally, the need for the agency and the design–builder to align their perceptions of geotechnical uncertainty as early as possible gains importance as a remedy to avoid potential disputes over DSC after construction has commenced.
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6 Guidelines for Managing Geotechnical Risks in Design–Build Projects what is expected according to the contract documents. Thus, the risk of DSC is usually borne by the owner in DBB projects.
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Introduction to Design–Build Geotechnical Risk Management 7 materially affected bid pricing. The conclusion is clear.
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8 Guidelines for Managing Geotechnical Risks in Design–Build Projects baseline design that it may not have found alone. As will be seen in subsequent chapters, ATCs provide a powerful geotechnical risk management and mitigation tool for DB projects.
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Introduction to Design–Build Geotechnical Risk Management 9 encountered, the first one to be realized, and if well managed, it can be the first one retired so that the project delivery team can focus on completing the remainder of the project. It can be argued that geotechnical risk may also be the risk that has the highest level of uncertainty during the preaward phase and, as previously mentioned, cannot be transferred in its entirety, regardless of contract language.
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10 Guidelines for Managing Geotechnical Risks in Design–Build Projects as a single and comprehensive source of geotechnical information obtained for the project." The GDR should contain the following information: – "Descriptions of the geologic setting; – Descriptions of the site exploration program(s) ; – Logs of all borings, trenches, and other site investigations; – Descriptions/discussions of all field and laboratory test programs; and – Results of all field and laboratory testing." • Geotechnical Baseline Report (GBR)
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Introduction to Design–Build Geotechnical Risk Management 11 recognized as inherent in the work provided for in the contract [U.S. Code, Differing Site Conditions, Title 23 CFR 635.109 (2013)
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12 Guidelines for Managing Geotechnical Risks in Design–Build Projects Most agencies that use DB have their own policies and standard operating procedures for conducting formal risk analyses on DB projects. Geotechnical, utilities, and other subsurface risks are generally included in those documents and implementing this guide in no way alters those procedures.
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Introduction to Design–Build Geotechnical Risk Management 13 objective system based on survey respondent ratings of each risk's frequency of occurrence and impact if realized. The three columns on the right side of Table 1.4 can be used as a checklist to ensure that the preaward geotechnical risk identification process includes the major common risks.
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14 Guidelines for Managing Geotechnical Risks in Design–Build Projects Table 1.5 contains a listing of 25 geotechnical risk management tools found to be effective during the research. The tools are grouped by stage of project development and delivery in which they apply.
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Introduction to Design–Build Geotechnical Risk Management 15 into conflict by a geotechnical risk management decision to shift the alignment of the project to avoid potentially contaminated material. A second example comes from the Virginia DOT, where the risk response decision is to trans fer the geotechnical risk to the design–builder and give it a 120day scope validation period after award to conduct its subsurface investigations and identify any potential DSC, after which DSC claims are not permitted.
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16 Guidelines for Managing Geotechnical Risks in Design–Build Projects appropriate credentials and past experience to meet them. One effective practice identified in the research was to quantify past experience in terms of the number of projects of similar scope, complexity, and magnitude rather than using an arbitrary number of years of similar experience.
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From page 17... ...
Introduction to Design–Build Geotechnical Risk Management 17 3. Qualitative Geotechnical Risk Analysis 4.
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