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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />November 29,2006 <br />Project 06-507B <br />2007 Street Reconstruction <br />Deerfield 3rd Addition Improvements <br />Elk River, Minnesota <br /> <br />c. Engineering Review <br /> <br />Discussion: <br /> <br />Based on our [mdings, this site appears to be well suited for the proposed street <br />reconstruction. The existing soils on this site are suitable for support of the utility pipes <br />and structures. The sand soils encountered on this site consisting of silty sand and clayey <br />sand (SM, SC-SM, SC) are fair for bituminous pavement support. These soils can often be <br />wet, especially during wet periods of the year. These soils may require drying or mixing to <br />reach optimum moisture for sub grade preparation. We recommend the pavement section <br />include a layer of select granular borrow between the subgrade and aggregate base to aid in <br />construction and internal drainage. In addition, subsurface drain tile should be installed in <br />sumps and low areas to drain the granular layer away from the subgrade soils. <br /> <br />D. Recommendations <br /> <br />The following recommendations are based on our understanding of the proposed project. If <br />our understanding of the project is not accurate or if-changes are-made-to-the-prujectscope, <br />please inform us so that our recommendations can be amended, if necessary. We have <br />included recommendations regarding earthwork and construction that may help in cost <br />estimates and aid in design. We should be allowed to review the proposed construction plans <br />to provide further detailed recommendations, if necessary. Without the opportunity to <br />review the final construction plans, the recommendations made in this report may no longer <br />be valid. <br /> <br />Utility Installation: <br /> <br />We recommend that all utility pipes lay in non-organic mineral soils capable of <br />supporting the pipes. Excessive over-excavation beneath the pipes should be avoided. <br />We recommend that 2 to 6 inches of granular bedding material be placed and compacted <br />around the pipe to aid in aligning the sanitary sewer pipe for line and grade. Granular <br /> <br />Page 5 <br />