Stone Base Repair for Existing Parking Lot

[scltn]

What is the best and/or cheapest course of action when you encounter a soft/yielding stone base after milling the asphalt for a existing parking lot?
AHA.

 

[civilperson]

Over excavate two or more feet and backfill with compacted crushed stone to the subgrade elevation.

 

[darthsoilsguy2]

for isolated areas get a cubic yard price for stone replacement as noted above. if the problem is systemic for a large area... than a geogrid/stone solution may be best.

 

[Drumchaser]

scltn
This is not the cheapest solution.
Assuming the milling is in advance of new ACP placement, and most of the stone base is in good enough shape to place new ACP on.
Assuming these areas are too small to get motorized equipment ( to rework base course )into.
Patching small areas of a base course is not very productive/successful due to the inability to achieve a good compactive effort in small areas.
Excavate the bad base out to neat *lines and place a base ACP ( *minimum size for small steel wheel compactor )flush with top of stone base. Then lay your surface course over the patches and existing base. 8-12" should be more than sufficient depending on your subgrade condition.

Obviously you may have to dry these patch areas out if they are unstable, pryor to placing the patching ACP.

Good luck