Our club has been operating on the grass immediately adjacent to the
paved runway for about 20 or 25 years now at KHRJ, Harnett County
Airport, North Carolina.
We take off from the paved runway and the towplane will land on the
paved runway while the gliders will usually land on the grass. If
there is no power traffic around, the glider may elect to land on the
pavement. We try not to interfere with power traffic operation. All
power traffic flies a standard left-hand pattern while gliders make
right traffic. Seems to work quite well.

Our club also pays to have the grass cut for the portion of grass we
use. The county cuts the grass, too, but only about four times per
year. We cut it every other week. Some conventional-geared airplanes
make use of our grass "runways."

I don't know of a written letter of agreement; just a "gentleman's
agreement" between the club and the FBO.

Ray Lovinggood
Carrboro, North Carolina, USA