<p><p><h2>Commentary</h2>The cost of deep dynamic compaction (DDC) is typically captured in a contract bid item which is measured by each drop of the tamper or by the square yard. Included in this bid item are associated incidental costs such as:<br><ul> <li>Layout of the grid spacing</li> <li>Monitoring of crater depth and ground displacement</li></ul>Other costs associated with DDC which may be measured and paid for separately include:<br><ul> <li>Mobilization</li> <li>Material for backfilling and leveling craters between passes and to restore the treated area back to original elevation</li></ul><h2>Cost Information Summary</h2>The following table lists items which are associated with the cost of DDC and approximate cost ranges. 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 the installation of DDC.<br><h3>Table 1. Cost Information Summary</h3><table class='tablepress' id='tablepress-78'><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 >Mobilization
</td><td >1</td><td >LUMP
SUM</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 >Deep Dynamic Compaction
</td><td >Greater Than 50,000</td><td >SY</td><td >$10.00</td><td >$25.00</td><td >• Prices increase as tamper mass increases
• Excessive crater depth and/or groundwater reduces the production rate
• Grid spacing of DDC will affect the price per square yard
• This cost range does not apply to tampers with a mass greater than 20 ton
</td></tr><tr><td >Material for Backfilling and Leveling Craters</td><td >–</td><td >CY</td><td >$3.00</td><td >$10.00</td><td >• Material specifications and haul distance will impact unit costs
• Imported material will cost more than material that comes from on-site excavation
</td></tr></tbody></table><h2>Historical Cost Information</h2>Research efforts did not yield any DDC bid tabulation data from state highway agencies.<br><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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