<p><p><h2>Commentary</h2>Because the scope of this technology is limited to the load transfer platform, cost information on column supported embankments is identical to geosynthetic reinforced embankments. Information regarding columns that may be used in conjunction with a column supported embankment is provided separately under the following technologies:<br><ul> <li>Continuous flight auger piles</li> <li>Deep mixing methods</li> <li>Geosynthetic encased columns</li> <li>Micropiles</li> <li>Aggregate columns</li> <li>Vibro-concrete columns</li></ul><h2>Cost Information Summary</h2>Production rates for the installation of geosynthetic reinforced load transfer platforms are highly sensitive to the delivery rate of granular material. Equipment and labor resources are easily adjusted to match the delivery rate of granular material. Information is provided on two categories of geosynthetics: first, those that are used for the load transfer platform, and second, geosynthetics that are used solely to provide a working platform for a subsequent ground improvement technology. The following table lists construction cost items associated with geosynthetic reinforced load transfer platforms used in column supported embankments, along with approximate cost ranges. Cost ranges are based on data from 2005 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 geosynthetic reinforced embankments.</p><p><table class='tablepress' id='tablepress-69'><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 >Geosynthetics Used
for Load Transfer
Platform
</td><td >Greater
Than 5,000 </td><td >SY</td><td >$2.50</td><td >$12.00</td><td >Geogrids are more expensive than fabrics
Woven fabrics are more expensive than
nonwoven fabrics
Heavier fabrics cost more
Smaller dimension grids and heavier grids
cost more
Specified lap widths impact the total
quantity of material required
Production rates are generally limited by the
delivery rate of granular material
</td></tr><tr><td >Geosynthetics Used
for Working
Platforms
</td><td >Greater
Than 5,000
</td><td >SY</td><td >$1.00</td><td >$3.50</td><td >Same as above</td></tr><tr><td >Granular Fill
Material
</td><td >Greater
Than 2,500</td><td >TON</td><td >$7.00</td><td >$20.00</td><td >Material specifications and haul distance
will impact unit costs
Haul route conditions will impact unit costs</td></tr></tbody></table><h2>Historical Cost Information</h2>A sample of actual project costs for geosynthetics used as reinforcement is shown in the table below.</p><p><table class='tablepress' id='tablepress-70'><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 >Geosynthetic Reinf.
Found. Over Soft
Soils</td><td >4,835</td><td >SY</td><td >$3.13</td><td >n/a</td><td >n/a</td><td >1</td><td >3/4/2009</td><td >Florida DOT
</td></tr><tr><td >Miscellaneous
Geogrid
Reinforcement,
Type I
</td><td >8,375</td><td >SY</td><td >$2.70</td><td >$5.60</td><td >$4.19</td><td >7</td><td >4/23/2009</td><td >Oregon DOT</td></tr></tbody></table></p><p>A sample of actual project costs for geosynthetics used in working platforms is shown in the table below.</p><p><table class='tablepress' id='tablepress-71'><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 >Reinforcement Grid
(Biaxial, Type 2)</td><td >90,023</td><td >SY</td><td >$2.53</td><td >n/a</td><td >n/a</td><td >1</td><td >7/29/2009</td><td >Florida DOT
</td></tr><tr><td rowspan=3 >Geogrid Base
Reinforcement</td><td >72,000</td><td >SY</td><td >$1.00</td><td >$2.40</td><td >$1.79</td><td >10</td><td >6/5/2009</td><td rowspan=3 >Arizona DOT
</td></tr><tr><td >28,100</td><td >SY</td><td >$1.75</td><td >$3.25</td><td >$2.21</td><td >9</td><td >6/12/2009</td></tr><tr><td >5,735</td><td >SY</td><td >$1.60</td><td >$3.50</td><td >$2.22</td><td >6</td><td >9/25/2009</td></tr><tr><td rowspan=2 >Stabilization
Geotextile, Special
</td><td >12,320</td><td >SY</td><td >$1.46</td><td >$4.80</td><td >$2.55</td><td >12</td><td >3/5/2010</td><td rowspan=2 >Michigan DOT</td></tr><tr><td >3,210</td><td >SY</td><td >$2.45</td><td >$3.25</td><td >$2.65</td><td >4</td><td >10/1/2010</td></tr><tr><td rowspan=3 >Geotextile
Stabilization
</td><td >32,367</td><td >SY</td><td >$0.84</td><td >$1.46</td><td >$1.15</td><td >6</td><td >3/25/2010</td><td rowspan=3 >New York
DOT </td></tr><tr><td >5,200</td><td >SY</td><td >$1.09</td><td >$2.51</td><td >$1.58</td><td >8</td><td >5/20/2010</td></tr><tr><td >13,459</td><td >SY</td><td >$1.05</td><td >$2.51</td><td >$1.46</td><td >7</td><td >6/10/2010</td></tr><tr><td >Special – Geogrid,
Type P2 (WT:06)</td><td >6,300</td><td >SY</td><td >$3.36</td><td >$3.52</td><td >$3.44</td><td >2</td><td >7/15/2010</td><td >Ohio 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>&nbsp;</p><p>&nbsp;</p></p>