<p><p><h2>Commentary</h2>Typical contract pay items and units of measurement used for geosynthetic separation in pavement systems include<br><ul> <li>Geosynthetic fabric measured by the square yard in-place</li></ul>The equipment used to construct geosynthetic separation in pavement systems is common to highway construction projects; therefore additional mobilization costs are negligible.<br><h2>Cost Information Summary</h2>The total labor and equipment cost associated with installation of geosynthetic separation in pavement systems is minimal. Material cost of the geosynthetic fabric makes up the majority of total cost. Production rates for the installation of geosynthetic separation fabrics are controlled by related construction activities (e.g., placement of base course(s) and paving). Equipment and labor resources are easily adjusted to match the production rate of controlling activities with little affect on total cost. The following table lists construction cost items associated with geosynthetic separation in pavement systems 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 geosynthetic reinforcement in pavements.</p><p><table class='tablepress' id='tablepress-94'><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 >Geosynthetic Separation Fabric</td><td >Greater Than 5,000</td><td >SY</td><td >$1.00</td><td >$2.50</td><td >Woven fabrics are more expensive than nonwoven fabrics
Heavier fabrics cost more
Specified lap widths impact the total quantity of material required
Production rates do not significantly affect unit costs
</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-95'><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 >Geotextile Separation</td><td >33,739</td><td >SY</td><td >$1.05</td><td >$1.76</td><td >$1.40</td><td >6</td><td >5/6/2010</td><td >New York DOT</td></tr><tr><td rowspan=3 >Separator Fabric</td><td >386,447</td><td >SY</td><td >$0.80</td><td >$1.24</td><td >$0.91</td><td >5</td><td >11/18/2010</td><td rowspan=3 >Oklahoma DOT</td></tr><tr><td >52,025</td><td >SY</td><td >$1.00</td><td >$2.03</td><td >$1.48</td><td >5</td><td >2/17/2011</td></tr><tr><td >25,694</td><td >SY</td><td >$1.00</td><td >$1.50</td><td >$1.26</td><td >5</td><td >4/14/2011</td></tr><tr><td >Geotextile Fabric Type SAS</td><td >65,930</td><td >SY</td><td >$0.95</td><td >$1.70</td><td >$1.24</td><td >7</td><td >2/10/2009</td><td >Wisconsin DOT</td></tr><tr><td >Geotextile (Separator) (Class 1)</td><td >8,800</td><td >SY</td><td >$1.20</td><td >$4.15</td><td >$2.42</td><td >8</td><td >4/1/2010</td><td >Colorado DOT</td></tr><tr><td >Separation Geotextile</td><td >14,033</td><td >SY</td><td >$1.07</td><td >$250</td><td >$1.87</td><td >7</td><td >4/20/2010</td><td >Kansas 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>