Influence of Geotechnical Investigation and Subsurface Conditions on Claims, Change Orders, and Overruns (2016) / Chapter Skim
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Pages 28-33
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29 chapter four CASE EXAMPLES The survey results presented in chapter three were used to select five agencies for further examination. The agencies were primarily identified based on responses that indicated agency success in reducing claims, change orders, and overruns result ing from subsurface conditions.
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30 encountered in pond borings to be assigned different strati graphic units from materials encountered in roadway bor ings to prevent claims associated with a contractor assuming pond material could be used as embankment fill or pavement subgrade. The pond material is typically too soft for such applications, even when the pond material classification is the same as material encountered in the roadway borings.
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31 standard practices for subsurface investigation and geotech nical design, including resistance factors that consider site variability, also produced design efficiencies, as evidenced by the reduction in value engineered projects. WASHINGTON STATE DEPARTMENT OF TRANSPORTATION Claims, change orders, and cost overruns attributed to sub surface conditions are not currently considered a significant problem for Washington State DOT (WSDOT)
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32 reminder that some claims, change orders, and cost overruns attributed to subsurface conditions are inevitable and that a target of zero claims is impractical. INDIANA DEPARTMENT OF TRANSPORTATION Indiana DOT (INDOT)
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33 Agency Practice MnDOT attempts to perform all subsurface investigations inhouse, but uses subcontracts to complete approximately 20% of the work in order to accommodate agency workload limitations. MnDOT's subsurface investigation guidelines are published in the agency's 2013 Geotechnical Engineering Manual (2013)
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34 the changes are tailored to a specific, recurring claim, change order, or cost overrun. • Development of minimum standards for subsurface investigation and site characterization can result in more accurate plan quantities and better prepared contractors.
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