<p><p><h2>Commentary</h2>The costs of aggregate columns on a highway project are typically captured in a contract bid item which is measured by the lineal foot (LF). Included in this bid item are the material, equipment, labor, and incidentals to construct an aggregate column. Mobilization associated with the installation of aggregate columns may be measured and paid for separately.<br><h2>Cost Information Summary</h2>The following table lists construction cost items that are associated with aggregate columns, along with approximate cost ranges. Cost ranges are based on data from 2007 through 2010. Readers should carefully examine the project characteristics and constraints and determine to what degree, if any, these factors may influence the actual cost associated with constructing aggregate columns. For many aggregate column applications, a working platform will be required. These costs should be included when comparing this technology with others. The cost of the geosynthetic for the working platform is provided in the Geosynthetic Reinforced Embankment Cost Information.</p><p><table class='tablepress' id='tablepress-9'><thead><th>Pay Item Description</th><th>Quantity Range</th><th>Unit</th><th>Low Unit Price</th><th>High Unit Price</th><th>Factors Which May Potentially Impact Costs</th></thead><tbody><tr><td >Aggregate Column</td><td >Greater Than 1,000</td><td >LF</td><td >$20.00</td><td >$60.00</td><td >Cost range stated applies to the bottom feed dry method
Cost of aggregate materials is sensitive to material specifications and haul distance
Unit costs will decrease as total quantity increases</td></tr><tr><td >Mobilization</td><td >1</td><td >LUMPSUM</td><td >$20,000</td><td >$40,000</td><td >Mobilization cost increases for distances greater than 500 miles
Phased projects may require multiple mobilizations</td></tr><tr><td >Embankment</td><td >Greater Than 5,000</td><td >CY</td><td >$ -</td><td >$ -</td><td >Use historical costs that are representative of the project quantity, project conditions and project location</td></tr></tbody></table><h2>Historical Cost Information</h2>A sample of actual project costs is shown in the table below:</p><p><table class='tablepress' id='tablepress-10'><thead><th>Pay Item Description</th><th>Quantity</th><th>Unit</th><th>Low Unit Price</th><th>High Unit Price</th><th>Average Unit Price</th><th>No. of Bids</th><th>Bid Date</th><th>Source/Agency</th></thead><tbody><tr><td >Stone Columns — Bottom Feed Vibro-Displacement (Dry) Method</td><td >6,467</td><td >LF</td><td >$39.62</td><td >$64.00</td><td >$53.62</td><td >10</td><td >10/8/2009</td><td >New York DOT</td></tr><tr><td >Misc. Rammed Aggregate Foundation System</td><td >6,000</td><td >LF</td><td >$30.00</td><td >$38.00</td><td >$31.45</td><td >13</td><td >5/1/2009</td><td >Michigan DOT</td></tr><tr><td >Misc. Stone Columns</td><td >3,470</td><td >LF</td><td >$25.91</td><td >$27.43</td><td >$26.41</td><td >3</td><td >6/29/2007</td><td >Missouri DOT</td></tr><tr><td >Ground Modification (Vibro-Stone Column)</td><td >11,160</td><td >LF</td><td >$26.00</td><td >$40.00</td><td >$29.73</td><td >11</td><td >2/9/2010</td><td >South Carolina DOT</td></tr><tr><td >Ground Modification (Vibro-Stone Column)</td><td >17,888</td><td >LF</td><td >$25.00</td><td >$34.00</td><td >$29.76</td><td >9</td><td >5/11/2010</td><td >South Carolina DOT</td></tr><tr><td >Ground Modification (Vibro-Stone Column)</td><td >74,138</td><td >LF</td><td >$17.85</td><td >$19.36</td><td >$18.64</td><td >5</td><td >9/14/2010</td><td >South Carolina DOT</td></tr></tbody></table><h2>Conceptual Cost Estimating Tool</h2>The conceptual cost estimating tool is intended to be used to develop a preliminary project scoping cost estimate. This preliminary estimate can be based on the typical construction cost item values as contained in the Cost Information product or from user specified cost values when such are known. Users should read and understand the information in Cost Information product prior to using the cost estimating tool. You can download the Cost Estimating Tool to open a cost estimating spreadsheet for producing a preliminary project scoping estimate.</p><p><a class="arrow-link" href="https://www.geoinstitute.org/sites/default/files/geotech-tools-uploads/… the Cost Estimating Tool</a></p><p> </p></p>
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