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*easier access for construction, repairs or maintenance of the area.
*easier access for construction, repairs or maintenance of the area.
Where diverting flows around the facility is not possible, and its location requires that it be used as a temporary runoff detention basin, protection measures can prevent fine sediment from migrating into the subgrade. During construction, the area should only be excavated to 75 cm above the final post-construction base of the facility. This layer of native soil will retain fine particles so that they will not migrate down into the subsoils. To prevent compaction during bioretention construction, heavy equipment should not enter the footprint of the bioretention area. For more detailed guidance, see the LID Construction Guide <ref> Credit Valley Conservation. 2012. LID Construction Guide. https://cvc.ca/wp-content/uploads/2012/01/CVC-LID-Construction-Guide-Book.pdf </ref> and the Erosion and Sediment Control Guide for Urban Construction <ref> Toronto and Region Conservation Authority. 2019. Erosion and Sediment Control Guide for Urban Construction. https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf </ref>.
Where diverting flows around the facility is not possible, and its location requires that it be used as a temporary runoff detention basin, protection measures can prevent fine sediment from migrating into the subgrade. During construction, the area should only be excavated to 75 cm above the final post-construction base of the facility. This layer of native soil will retain fine particles so that they will not migrate down into the subsoils. To prevent compaction during bioretention construction, heavy equipment should not enter the footprint of the bioretention area. For more detailed guidance, see the LID Construction Guide <ref> Credit Valley Conservation. 2012. LID Construction Guide. https://cvc.ca/wp-content/uploads/2012/01/CVC-LID-Construction-Guide-Book.pdf </ref> and the Erosion and Sediment Control Guide for Urban Construction <ref> Toronto and Region Conservation Authority. 2019. Erosion and Sediment Control Guide for Urban Construction. https://sustainabletechnologies.ca/app/uploads/2020/01/ESC-Guide-for-Urban-Construction_FINAL.pdf </ref>.
{{Clickable button|[[File:Bioretention.png|125 px|link=https://wiki.sustainabletechnologies.ca/wiki/Finishing_grades_and_surface_layer_installation:_vegetated_LIDs]]}}
==Inspection and Maintenance==
==Inspection and Maintenance==