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Wayzata Country Club <br /> Project BL-08-03640 <br /> September 29, 2008 <br /> Page 5 <br /> project details, we should be notified. New or changed information could require additional evaluation, <br /> analyses,and/or recommendations. <br /> C.2. Design Considerations <br /> The organic soil (peat) encountered in the borings is highly compressible and could settle/consolidate <br /> several inches as new fill is placed above it. The amount of settlement will vary depending on the <br /> thickness of new fill placed and also on the length of time the new fill remains inplace. <br /> Settlement of the organic soils can have three different components: immediate settlement, primary <br /> consolidation,and secondary consolidation. In general,the immediate settlement and primary <br /> consolidation results from air and water being squeezed from the soil due to the initial weight or load <br /> applied to the soil. Secondary consolidation occurs after the excess water(pore water pressures) have <br /> dissipated and the soil particles continue to move slowly until finding a stable arrangement. <br /> In peat or other highly organic soils, it is not always easy to determine when primary consolidation ends <br /> and secondary consolidation begins and secondary consolidation can constitute a major portion of the <br /> total settlement. <br /> The peat will continue to settle for several years upon the addition of new fill. Since the peat will likely <br /> not settle uniformly, ongoing maintenance of the fairway may be required to provide a uniform surface. <br /> Surcharging the peat with the weight from additional fill, then removing the fill weight after a time period <br /> —usually three to six months—will reduce the long-term settlement. <br /> C.3. Construction Considerations <br /> From a construction perspective,the project team should also be aware that: <br /> • The sand and gravel encountered in borings ST-1,ST-2, and ST-3 is judged to be suitable for <br /> use as embankment fill. <br /> • As mentioned previously in this section,the peat is highly compressible and the amount of <br /> settlement depends, in part, on the length of time the fill remains. We assume that once the <br /> fill is placed, it will remain so. Based on our analysis,we estimate the peat will continue to <br /> settle for a period of several years. Due to the varying depths of fill encountered in the <br /> borings, the peat may not settle uniformly across the fairway. <br /> BRAUN <br /> INTERTEC <br />