<p><p><h2>Commentary</h2>The costs of drilled/grouted soil nails on a highway project are typically captured in the following contract pay items:<br><ul> <li>Soil nails measured by the lineal foot (LF) or by each (EA) nail installed</li> <li>Drainage system by the square foot (SF)</li> <li>Permanent or temporary wall facing by the square foot (SF)</li> <li>Mobilization, quality control, and load testing associated with the installation of drilled/grouted soil nails may be measured and paid for separately.</li></ul><h2>Cost Information Summary</h2>The following table lists construction cost items that are associated with drilled-grouted and hollow bar soil nails, along with approximate cost ranges. Cost ranges are based on data from 2010 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 installing drilled/grouted soil nails and wall facings.</p><p><table class='tablepress' id='tablepress-84'><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 >Geocell
</td><td >Greater Than 5,000</td><td >SY</td><td >$5.00</td><td >$8.00</td><td >Approximate costs reported by Henry et al (2005); "Improved Performance of Unpaved Roads During Spring Thaw." USACE ERDC/CRREL TR-05-1, Engineer Research and Development Center, Cold Region Research and Engineering Laboratory, Hanover, NH
Unit costs will increase as cell height increases
</td></tr><tr><td >Geosynthetic Separation Fabric</td><td >Greater Than 5,000
</td><td >SY</td><td >$1.00</td><td >$2.50</td><td >Woven fabrics are more expensive than nonwoven fabrics
Heavier fabrics cost more
Specified lap widths impact the total quantity of material required
Production rates do not significantly affect unit costs
</td></tr><tr><td >Infill Material</td><td >Greater Than 500
</td><td >TON</td><td >$-</td><td >$-</td><td >Sand, gravel, aggregate and recycled asphalt pavement have been used as infill materials
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-83'><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 >Soil Nail – Epoxy Coated</td><td >65</td><td >EA</td><td >$469.00</td><td >$660.00</td><td >$581.75</td><td rowspan=4 >12</td><td rowspan=4 >2/3/2010</td><td rowspan=4 >Washington DOT
</td></tr><tr><td >Soil Nail Verification Test and Soil Nail Proof Test</td><td >5</td><td >EA</td><td >$520.00</td><td >$2,414.00</td><td >$975.34</td></tr><tr><td >Prefabricated Drainage Mat</td><td >217</td><td >SY</td><td >$4.00</td><td >$67.00</td><td >$12.24</td></tr><tr><td >Shotcrete Facing</td><td >2,193</td><td >SF</td><td >$10.00</td><td >$18.00</td><td >$14.73</td></tr><tr><td >Soil Nail – Encapsulated</td><td >445</td><td >EA</td><td >$640.00</td><td >$846.51</td><td >$709.08</td><td rowspan=4 >10
</td><td rowspan=4 >6/23/2010</td><td rowspan=4 >Washington DOT</td></tr><tr><td >Soil Nail Verification Test and Soil Nail Proof Test</td><td >22</td><td >EA</td><td >$500.00</td><td >$1,209.31</td><td >$726.83</td></tr><tr><td >Prefabricated Drainage Mat</td><td >1,992</td><td >SY</td><td >$5.00</td><td >$18.00</td><td >$7.97</td></tr><tr><td >Shotcrete Facing</td><td >8,110</td><td >SF</td><td >$11.49</td><td >$23.00</td><td >$14.16</td></tr><tr><td >Furnish, Drill and Install Soil Nails</td><td >7,883</td><td >LF</td><td >$28.00</td><td >$55.40</td><td >$37.84</td><td rowspan=2 >9</td><td rowspan=2 >10/21/2010</td><td rowspan=2 >Oregon DOT</td></tr><tr><td >Retaining Wall, Soil Nail</td><td >8,955</td><td >SF</td><td >$30.80</td><td >$80.00</td><td >$55.20</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>