<p><p><h2>Commentary</h2>The costs of deep mixing on a highway project are typically captured in a contract bid item measured by the cubic yard (CY). Included in this bid item are the material, equipment, labor, and incidentals to construct a deep mixed column. Mobilization, quality control, and load testing associated with the installation of deep mixed columns may be measured and paid for separately.<br><h2>Cost Information Summary</h2>The following table lists construction cost items associated with deep mixed columns, along with approximate cost ranges. Cost ranges are based on data from 2009 through 2011. 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 deep mixed columns. For many deep mix 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-79'><thead><th>Pay Item Description</th><th>Quantity</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 >Deep Soil Mixing
</td><td >Greater Than 5,000</td><td >CY</td><td >$60.00</td><td >$125.00</td><td >Cost range stated applies to the dry method
Cost of lime/cement materials is sensitive to material specifications and haul distance
Unit costs will decrease as depth increases
</td></tr><tr><td >Mobilization</td><td >1</td><td >LUMP
SUM</td><td >$75,000</td><td >$125,000</td><td >Mobilization cost increases for distances greater than 500 miles
Phased projects may require multiple mobilizations
</td></tr><tr><td >Embankment</td><td >Greater Than 5,000
</td><td >CY</td><td >$-</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-80'><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 >Deep Soil Mixing, Dry</td><td >4,867</td><td >CY</td><td >$79.12</td><td >n/a</td><td >n/a</td><td >1</td><td >4/29/2009</td><td >Florida DOT
</td></tr><tr><td >Ground Improvement-Deep Soil Mixing Lime Cement Columns T-1</td><td >22,770</td><td >CY</td><td >$60.00</td><td >$92.12</td><td >$70.59</td><td >7</td><td rowspan=2 >1/8/2011</td><td rowspan=2 >South Carolina DOT</td></tr><tr><td >Ground Improvement-Deep Soil Mixing Lime Cement Columns T-2</td><td >12,799</td><td >CY</td><td >$62.80</td><td >$122.60</td><td >$83.49</td><td >7</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>