Jim,
At my club in Virginia, one of our members has been able to borrow a
15 ton powered roller (you ride on it). Members are then "checked
out" to drive it and volunteer to spend time running it up and down
the airfield. Special emphasis is then placed on problem areas and
appropriate fill dirt added where needed. This has worked out very
well in leveling the the underlying dirt without significant impact to
the grass. It just pops back up.

Later!

-Mark
On Sep 22, 8:30*am, Jim White wrote:
Does anyone here have any experience improving a grass runway. In
particular levelling it without actually removing the grass, leveliing the
soil, and resowing / returfing.

I wonder if a routine of rigorous slicing aerating followed by sand / grit
dressing, and rolling would do the job?

Jim