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| ===Backfill Granular and Pipes (JC)=== | | ===Backfill Granular and Pipes (JC)=== |
| '''Geotextile'''<br> | | '''Geotextile'''<br> |
| '''Impermeable liner'''<br> | | Geotextiles are filter fabrics that can be installed to separate dissimilar soils and prevent the migration of materials. As such, proper installation of geotextiles is important for ensuring the proper division of materials. |
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| | Construction Steps: |
| | *Roll out fabric on the flattened sub-grade surface |
| | *Provide a minimum overlap of 300 mm between adjacent lengths of geotextile. If the manufacturer specifies a greater overlap, follow the manufacturer’s specification |
| | *Fabric should be secured in place with stakes along the edge of the sub-grade surface and where lengths of fabric overlap |
| | *Provide 500 mm of excess at the ends of each length of fabric |
| | *Excess material should be folded on top of the infiltration medium/choker course once installed |
| | *Provide cuts for trees where appropriate |
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| | Key Inspection Points: |
| | *Inspect the geotextile to make sure it is clean and free of damage |
| | *Ensure that the geotextile delivered to the site matches the design specifications and is approved by the engineer prior to installation |
| | *Check that sufficient overlap is provided between lengths of fabric |
| | *Confirm that geotextiles have been applied as per the manufacturer’s guidelines |
| | *Confirm that structural considerations for geotextiles that are applied adjacent to infrastructure |
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| | Mistakes to Avoid: |
| | *Wrinkles in the fabric – follow the manufacturer’s procedure for installation to ensure geotextiles lie smooth on sub-grade |
| | *Unnecessary application of geotextile – mixing of media is negligible where structural loads are not expected, so geotextile does not need to be applied. Also geotextiles should not be used where root growth is encouraged to penetrate different layers of media |
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| | For more information on geotextiles, see the page on geotextiles. |
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| | '''Impermeable liner'''<br> |
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| '''Underdrain'''<br> | | '''Underdrain'''<br> |
| '''Overflow or Overflow Drain'''<br> | | '''Overflow or Overflow Drain'''<br> |
| '''Monitoring well'''<br> | | '''Monitoring well'''<br> |
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| ===Backfill Granular and Pipes (SPC)=== | | ===Backfill Granular and Pipes (SPC)=== |
| '''Storage Reservoir'''<br> | | '''Storage Reservoir'''<br> |