<p><p><h2>Commentary</h2>Typical contract pay items and units of measurement used for partial encapsulation include:<br><ul> <li>Geomembrane measured by the square yard in-place</li></ul>The equipment used to construct partial encapsulation 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 partial encapsulation is similar to other geotextile applications. Material cost of the partial encapsulation makes up the vast majority of the total cost. Production rates for the installation of membranes for partial encapsulation 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 effect on total cost. The following table lists construction cost items associated with partial encapsulation, along with approximate cost ranges. Cost ranges are based on data from 2009 and 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 partial encapsulation.</p><p><table class='tablepress' id='tablepress-114'><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 >Geomembrane</td><td >Greater Than 1,000</td><td >SY</td><td >$2.50</td><td >$10.00</td><td >Material specifications (weight, strength, etc.) have a large influence on material costs
Specialized applications such as bridge approaches and isolated embankments have higher unit costs than mass applications such as encapsulating all of the roadway subgrade
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-115'><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 rowspan=2 >Geomembrane</td><td >10,300</td><td >SY</td><td >$3.80</td><td >$7.00</td><td >$5.54</td><td >4</td><td >9/30/2010</td><td rowspan=2 >Colorado DOT</td></tr><tr><td >6,480</td><td >SY</td><td >$1.10</td><td >$4.51</td><td >$2.62</td><td >6</td><td >7/8/2010</td></tr><tr><td rowspan=2 >Moisture Barrier Membrane</td><td >209,048</td><td >SY</td><td >$2.25</td><td >$2.50</td><td >$2.40</td><td >3</td><td >2/18/2010</td><td rowspan=2 >Oklahoma DOT</td></tr><tr><td >60,002</td><td >SY</td><td >$2.83</td><td >$3.85</td><td >$3.31</td><td >7</td><td >3/20/2009</td></tr><tr><td >Impermeable Membrane for Subgrades, Basins, Ditches, and Canals</td><td >12,630</td><td >SY</td><td >$6.86</td><td >$9.84</td><td >$8.22</td><td >7</td><td >3/20/2009</td><td >Georgia 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>