Influence of Geotechnical Investigation and Subsurface Conditions on Claims, Change Orders, and Overruns (2016) / Chapter Skim
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INFLUENCE OF GEOTECHNICAL INVESTIGATION AND SUBSURFACE CONDITIONS ON CLAIMS, CHANGE ORDERS, AND OVERRUNS Subsurface conditions are frequently considered to represent significant elements of technical and financial risk for infrastructure projects. Unfortunately, information quantifying these risks is rare.
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2 • Misclassified or mischaracterized subgrade, resulting in quantity revisions related to pavements, earthwork, and removal and replacement requirements for foundations; • Unanticipated rock excavation, especially that when encountering rock shallower than expected or encountering rock at foundation locations where it was not expected; and • Mischaracterized rock for drilled shaft construction. The survey revealed the following quantitative information regarding the frequency and cost of claims, change orders, and cost overruns attributed to subsurface conditions: • The annual cost of change orders resulting from subsurface conditions was commonly in the millions of dollars and as much as $10 million per agency.
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3 The scarcity of published quantitative information regarding claims, change orders, and cost overruns attributed to subsurface conditions underscores the value of the survey findings of this Synthesis. The findings are motivation for additional research to reduce uncertainties regarding subsurface conditions claims, change orders, and overruns and helped to identify areas where modifications to agency practices could produce notable cost or performance improvements.
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