Spec InterpretationWashington
State of Washington
Department of Transportation Specifications
December, 2011
WSDOT
Washington DOT appears to utilize AASHTO M 288 as a guideline for geotextile with some modifications. The specification for "Geotextile Properties for Retaining Wall & Reinforced Slopes" is very confusing. The Washington DOT Qualified Products List for this specification list geogrids, which would make sense for this application. However the specification clearly allows for a woven and nonwoven geotextile. Perhaps these are to be used as facing wraps? Please be careful here. Below are US Fabric's geotextile products that meet the Washington DOT geotextile specification, listed by their application.
Click on the red product name for a data sheet.
| SPECIFICATION | APPLICATION | NON WOVEN | WOVEN | COMPOSITE | GRID |
|---|---|---|---|---|---|
| 9-33.2 Table 1 & 2 | Underground Drainage (Low Survivability) | -- | -- | -- | -- |
| Class A | US 120NW | US 670 | -- | -- | |
| Class B | US 120NW | US 670 | -- | -- | |
| Class C | US 205NW | -- | -- | -- | |
| 9-33.2 Table 1 & 2 | Underground Drainage (Moderate Survivability) | -- | -- | -- | -- |
| Class A | US 160NW | US 670 | -- | -- | |
| Class B | US 160NW | -- | -- | -- | |
| Class C | US 205NW | -- | -- | -- | |
| 9-33.2 Table 3 | Separation | US 160NW | US 250 | -- | -- |
| 9-33.2 Table 3 | Soil Stabilization | US 205NW | US 4800 | -- | -- |
| 9-33.2 Table 4 & 5 | Permanent Erosion Control (Moderate Surv) | -- | -- | -- | -- |
| Class A | US 160NW | -- | -- | -- | |
| Class B | US 160NW | -- | -- | -- | |
| Class C | US 160NW | -- | -- | -- | |
| 9-33.2 Table 4 & 5 | Permanent Erosion Control (High Surv) | -- | -- | -- | -- |
| Class A | US 205NW | -- | -- | -- | |
| Class B | US 205NW | -- | -- | -- | |
| Class C | US 205NW | -- | -- | -- | |
| Ditch Lining | US 160NW | US 250 | -- | -- | |
| 9-33.2 Table 7 | Retaining Walls & Slopes (face wrap?) | US 120NW | US 200 | -- | -- |
| 9-33.2 Table 7 | Retaining Walls & Slopes | -- | -- | -- | SG 150 |
| 9-33.2 Table 7 | Retaining Walls & Slopes | -- | -- | -- | SG 200 |
| 9-33.2 Table 7 | Retaining Walls & Slopes | -- | -- | -- | SG 350 |
| 9-33.2 Table 7 | Retaining Walls & Slopes | -- | -- | -- | SG 500 |
| 9-33.2 Table 7 | Retaining Walls & Slopes | -- | -- | -- | SG 550 |
| 9-33.2 Table 7 | Retaining Walls & Slopes | -- | -- | -- | SG 600 |
| 9-33.2 Table 7 | Retaining Walls & Slopes | -- | -- | -- | SG 700 |
More resources may be found on the web:
State QPL information:
NOTES:
- US Fabrics' Products (With the exception of Strata Geogrids) are not currently listed on the WSDOT QPL.
- The above information is to be used only as a guide.
- Please verify the meaning of "max AOS" as understood by the project engineer.
- Products on the above list can change without notice.
Areas Served:
US Fabrics is proud to serve the geotextile needs of the State of Washington, including: Seattle, Spokane, Tacoma, Vancouver, Bellevue, Everett, Kent, Yakima, Renton, Spokane Valley, Federal Way, Bellingham, Kennewick, Auburn, Marysville, Pasco, Lakewood, Redmond, Shoreline, Kirkland, Richland, Olympia, Sammamish, Lacey, Edmonds, Bremerton, Puyallup, Longview, Lynnwood, Bothell, Burien, Wenatchee, Mount Vernon, Walla Walla, University Place, Issaquah, Pullman, Des Moines, Lake Stevens, SeaTac, Bainbridge Island, Mercer Island, Maple Valley, Oak Harbor, Kenmore, Moses Lake, Mukilteo, Mountlake Terrace, Camas, Tukwila, Port Angeles, Mill Creek, Ellensburg, Arlington, Covington, Battle Ground, Bonney Lake, Tumwater, Monroe and all other areas of Washington.