Changes

*final excavated grade and verification

*final excavated grade and verification

===Sub-surface components===

==Sub-surface components==

Many LID practices rely on sub-surface features--gravel storage reservoirs, liners, underdrains, monitoring wells, etc.--to function. The construction process for sub-surface components works from the ground up. While some LID practices include all the sub-surface components listed below, most designs will not include one or more of these layers. Also, permeable pavement types can have different construction requirements at this stage, mostly regarding compaction of sub-surface layers.  

Many LID practices rely on sub-surface features--gravel storage reservoirs, liners, underdrains, monitoring wells, etc.--to function. The construction process for sub-surface components works from the ground up. While some LID practices include all the sub-surface components listed below, most designs will not include one or more of these layers. Also, permeable pavement types can have different construction requirements at this stage, mostly regarding compaction of sub-surface layers.